Ease Of Observation Research Articles

Avermectin induced vascular damage in zebrafish larvae: association with mitochondria-mediated apoptosis and VEGF/Notch signaling pathway

Avermectin is a highly effective insecticide that has been widely used in agriculture since the 1990s. In recent years, the safety of avermectin for non-target organisms has received much attention. The vasculature is important organs in the body and participate in the composition of other organs. However, studies on the vascular safety of avermectin are lacking. The vasculature of zebrafish larvae is characterized by ease of observation and it is a commonly used model for vascular studies. Therefore, zebrafish larvae were used to explore the potential risk of avermectin on the vasculature. The results showed that avermectin induced vascular damage throughout the body of zebrafish larvae, including the head, eyes, intestine, somite, tail and other vasculature. The main forms of damage are reduction in vascular diameter, vascular area and vascular abundance. Meanwhile, avermectin induced a decrease in the number of endothelial cells and apoptosis within the vasculature. In addition, vascular damage may be related to impairment of mitochondrial function and mitochondria-mediated apoptosis. Finally, exploration of the molecular mechanisms revealed abnormal alterations in the expression of genes related to the VEGF/Notch signaling pathway. Therefore, the VEGF/Notch signaling pathway may be an important mechanism for avermectin-induced vascular damage in zebrafish larvae. This study demonstrates the vascular toxicity of avermectin in zebrafish larvae and reveals the possible molecular mechanism, which would hopefully draw more attention to the safety of avermectin in non-target organisms.

Seasonal variation in marine bird distribution in the northeast Pacific Ocean

Human activities have profound influences on marine ecosystems. Marine birds are particularly sensitive to these impacts and, given their ease of observation and diverse life histories, often represent good indicators of ecosystem health. Conserving marine birds and their ecosystems requires robust predictions of species distribution to help mitigate human disturbance in areas where large aggregations of diverse species occur. We modelled variation in marine bird species diversity (Shannon-Wiener Index) and taxonomic family level probability of occurrence to map the intensity and extent of highly diverse ‘hotspots’ in Canada’s Pacific Exclusive Economic Zone. To do so, we paired 20 yr of survey data from the North Pacific Pelagic Seabird Database (1997-2017) and remote sensing data describing marine conditions and local geography (sea surface temperature, chlorophyll a, bathymetry, distance to shore, and benthic substrate type). These data were used to illustrate how seasonality within years and the El Niño-Southern Oscillation (ENSO) across years influenced spatial patterns in diversity. Hotspots were most persistent in Hecate Strait, off the west coast of Vancouver Island, and surrounding the Scott Islands in most seasons. Changes in hotspot locations and intensity were observed across seasons and within season under varying ENSO conditions. Our results provide a template for mapping marine species distribution for the purpose of identifying hotspots of diversity, and thereby facilitate planning to minimize harmful impacts in highly diverse and dynamic systems.

Power loss model of electromagnetic waves propagation in cell solutions by GHz electrical impedance spectroscopy

The propagation of GHz electromagnetic (EM) waves across cells in cell solutions has been analytically modeled and numerically calculated in order to elucidate the power loss in the boundary between dispersed medium and cell by establishing a theoretical model. Living and dead yeast cells are chosen as objects because of the simple cell structure and ease of observation under optical microscope. Through the model, the average power density of the incident wave S avi , reflected wave S avr , transmitted wave S avt , and ratio of the power loss ψ are calculated and compared to analyze the power loss of EM waves inside living and dead yeast cells by considering the impacts of frequency of EM wave, cell viability, concentration, and component structures of the cell. Results demonstrate decreased S avi, S avr , and S avt with rising frequency, especially noticeable below 100 MHz due to enhanced absorption from cell components. EM waves in living yeast cell solutions exhibit faster attenuation and stronger reflection compared to dead yeast cells, attributed to intact organelles and membranes intensifying absorption and scattering. The increasing cells concentration further attenuates EM waves. This work elucidates propagation and power loss of EM waves in cell solutions and provides an effective computational approach to optimize EM wave based biomedical applications.

Innovation In Population Administration Services

Population management is one of the services that the local government must offer. The Bandung Regency Government established E-Sakedap in response to widespread public complaints regarding population administration services. Sakedap is an online service for maintaining marriage and divorce certificates for non-Muslims, as well as birth, death, and moving in and out certifications for Indonesian nationals. Data from the research findings were collected, analyzed, and compared using the descriptive qualitative research method. The focus of the study is Sakedap's population administration service innovation in Ciparay Village, Bandung. Kurhayadi claims that the attribute theory of innovation—which takes into account comparative benefits, ease of observation, appropriateness, complexity, and the possibility of trying—is the theory used in the analysis. The research's conclusions, in particular the Sakedap in Program at the Ciparay Village Office, have been able to provide advantages in the form of simpler service because visiting the village is sufficient; visiting the Population and Civil Registry Office is not required. The village is quicker and uses less energy because you don't need to visit as frequently, so there is no need to spend money there either. The implementation of Sakedap is in accordance with the applicable laws, and E-Sakedap is in accordance with the community's demands in order to obtain services that will make population administration easier. There are no problems with Sakedap implementation in Ciparay Village, Bandung. People who lack technological skills and those who think complexity only grows are both wrong. The installation of Sakedap has allowed the community to readily track the scope of the service process for creating population administration records.

A “turn-on” approach for rapid detection of tetracycline based on supramolecular aggregates of water soluble perylene diimide

Antibiotic residue in animal foods has aroused great attention. Herein, we report a “turn-on” approach via supramolecular aggregates of water soluble perylene diimide (PDI) for rapid detection of tetracycline (TC), which is very important to food quality and safety. The disassembly of PDI aggregate was promoted owing to the coordination of Eu3+ and TC, leading to a significant recovery of fluorescence intensity. The sensing mechanism and performance of this approach were studied by absorption and emission spectra. The limit of detection (LOD) and the operation range were 12.11 nM and 0.1–30 μM, respectively. This method features simple acquisition, free of organic solvents, rapid detection, high selectivity and sensitivity, ease of observation and operation. It could be applied to detecting TC in Chicken, Fish and Pork with good recovery. To our knowledge, this is the first report of TC based on PDI probe in aqueous media.

Quantification of Intra Embryonic Motions Through Label Free and Fast Imaging Of Yolk Granules

<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Caenorhabditis elegans</i> is widely used as a model organism and its oocyte and embryos’ reproductive development are under extensive study due to their ease of observation and cultivation. As one of the main embryo constituents, yolk granules and their motion serve important functions such as storage of energy and materials. However, current observation and analysis methods have issues such as being toxic, problematic identification of densely distributed particles, or being too slow to track fast movement. Here we use a home-built, label-free imaging system that faithfully images the particles at a high frame rate. Then, a trained U-Net with an upsampling block is used to recognize the granules with high accuracy compared to traditional methods (83% vs 50%). Through motion analysis, we found that most granules can only be tracked in a short period of time (thus presenting an additional challenge for slower imaging methods). While typical diffusion model is not appropriate for short tracks, we use the track-averaged speed and its distribution parameters to characterize the intra embryonic motions, classifying embryos from normal and starved mothers, thus demonstrating that our method can be used to quantitatively evaluate the embryo's quality without any extraneous labels.

Earthquake geochemical scientific expedition and research

Large earthquakes can cause both casualties and economic losses, but they also provide invaluable opportunities for earthquake scientific research. Geofluids, due to their wide distribution, sensitive response to underground conditions, and ease of observation, are widely applied in field investigations after earthquakes. Analyzing the origin of fluids, energy transfer processes, temperature/pressure conditions, and the spatial-temporal evolution of geofluids can provide valuable information concerning the mechanism of earthquake precursor anomalies, short-term prediction methods, identification of the seismogenic faults, determination of earthquake risk, and the environmental impact of post-earthquake fluids. This article details post-earthquake scientific expeditions and research on fluid geochemistry in China and abroad, aimed at providing ideas and guidance for future scientific expedition work and geochemistry-related earthquake studies.

Mitochondria‐Targeting BODIPY Probes for Imaging of Reactive Oxygen Species

AbstractReactive oxygen species (ROSs) are an important class of signaling molecules that play a critical role in regulating physiological processes in the human body. Mitochondria are the primary site of ROSs production, and abnormal concentrations of ROSs can lead to the malignant proliferation of cells, resulting in diseases. Therefore, it is crucial to detect ROSs in mitochondria. Fluorometric methods have gained significant attention from scientists because of their ease of observation, simplicity of operation, and noninvasiveness. Among the fluorescent dyes, boron‐dipyrromethene (BODIPY) stands out for its high quantum yield, large molar extinction coefficient, and excellent chemical stability, making it widely used in fluorescent imaging. The common design principle of fluorescent probe for the detection of ROSs includes photo‐induced electron transfer, intramolecular charge transfer, and fluorescence resonance energy transfer. This paper provides an overview of BODIPY‐based fluorescent probes designed for imaging ROSs in mitochondria, covering the sensing mechanisms, molecular engineering strategies, and recent advancements. Additionally, the review provides insight into the potential clinical applications of mitochondria‐targeting BODIPY probes in disease diagnosis.

Adaptively Equalized Bandwidth Optimization Model using SCADA-DWWAN based Neural Network

Artificial training and learning algorithms, enhanced with semi-supervised or self-supervised feature extraction capacities, employ adaptive decision optimization models. These are often favored over complex deep learning algorithms for achieving better controllability and ease of observation, lower complexity in simulating, building or designing and virtual prototyping of automatic network resource management (ANRM) standards. An Adaptive Linear Neuron type Artificial Neural Network (ADALINE-ANN) which is based on multi-tapered machine learning approach has been simulated in a virtual Supervisory Control and Data Acquisition (SCADA) framework integrated with a Distributed Control System (SCADA/DCS-Net). The system has been virtually simulated considering an adaptively equalized learning and decision approach which utilizes Markov Trained-Steepest Gradient Descent (HMM-SGD) based machine learning model employing Kalman optimization. Affinity clustering is employed for spectrum sensing by extracting the Constellation Nyquist Bands from an M-Quadrature Amplitude Modulation (QAM) orthogonal signal undergoing AWGN and Rayleigh fading as well as co-channel interference (CCI), and ensemble analysis using Channel State-Space plots are used for optimal spectrum allocation in an Adaptive Orthogonal Frequency Division Multiple Access (Adaptive-OFDMA) layout. It has been done by implementing an adaptively equalized Automatic Repeat Request (ARQ) pipelining model which utilizes minimum least square error (MLSE) minimization model. The objective is to improve the bandwidth allocation and usage ensuring most minimum spectrum wastage or loss. Successive Interference Cancellation (SIC) has been implemented to minimize static buffer and interference loss. Thus, spectrum loss due to latency and jitter which occurs from bandwidth congestion is minimized by improving the network resource tracking and allocation. It results in improved and stable bandwidth equalization.

Dukcapil Service Innovation in Improving the Quality of Service in the Lebong District

This article aims to describe and provide an overview of the application-based innovation of the Lebong Dukcapil Service in the process of making population administration documents in the Lebong Regency to improve the quality of quality public services. Registration Service as the service provider in the field of population and civil registration. This research uses descriptive qualitative research, data sources use interview techniques and direct observation in the field, as well as documentation. The results of this study indicate that population administration services through the Lebong Dukcapil Service application at the Lebong Regency Population and Civil Registration Service are quite good This is seen from the aspects: of relative advantage, suitability, complexity, possibility to try, and ease of observation. With the application-based innovation of the Lebong Dukcapil Service, it is expected to be able to improve service quality through effective and efficient service patterns, as well as being oriented towards innovation targets. possibility to try, and ease of observation. With the application-based innovation of the Lebong Dukcapil Service, it is expected to be able to improve service quality through effective and efficient service patterns, as well as being oriented towards innovation targets. possibility to try, and ease of observation. With the application-based innovation of the Lebong Dukcapil Service, it is expected to be able to improve service quality through effective and efficient service patterns, as well as being oriented towards innovation targets

PUBLIC SERVICE INNOVATION BASED ON e-OPen APPLICATION AT DINAS KEPENDUDUKAN DAN CATATAN SIPIL KOTA BEKASI

Public service innovation is important to do, given the development of today's information and technology. Online-based public service innovation is a new form of change that adapts to the times. The purpose of the research conducted is to find out how the application of the e-OPen application at the Bekasi City Population and Civil Registration Office, to find out the obstacles as well as the supporting and inhibiting factors carried out by the Bekasi City Population and Civil Registration Service. The method used in this study is qualitative, namely research methods about research that are descriptive and tend to use analysis. The results of this study explain that the E-Open application runs well and is quite optimal, as seen from the following indicators: 1) Relative advantage: The e-OPen application provides many advantages, namely making it easier for people to make population documents online, the availability of prestige to help community difficulties. 2) Compatibility: The e-OPen application is a development of the Simpaduk Application which is technologically still to the previous application because it uses almost the same tools. 3) Complexity: the level of complexity in the e-OPen application is interference with the mobile phone network which suddenly becomes unstable. 4) Possible Trial: The e-OPen application passed the trial stage in February and is being carried out in stages. 5) Ease of Observation: This e-OPen application has been proven to have more advantages or value compared to previous innovations. This innovation can be observed by all levels of society, both from government and non-government institutions, the private sector, and activist organizations.

KUCATA'KI: An Innovation of Population Administration Services in Makassar City

Kucata'ki is an innovation of death and birth population administration service in Makassar City. This paper aims to determine the application of Kucata'ki public service innovation in Makassar City and to find out the supporting and inhibiting factors in this application. This study uses a qualitative approach with a descriptive method. Data collection techniques were carried out by means of observation, interviews, and documentation. The data analysis technique uses condensation, data presentation, conclusion drawing and verification. The results of this study indicate that the implementation of Kucata'ki public service innovations in Makassar City has been going well. This can be seen from the three indicators that have been running well, namely: relative advantage, possibility of trial and ease of observation. Two other indicators that are still not good are: suitability and complexity. The supporting factors for the implementation of Kucata'ki public service innovations are the commitment of the Population and Civil Registry services to health facilities and urban villages as well as adequate human resources and infrastructure, while the inhibiting factor is in terms of technical constraints, namely the quality of the network.

Case Study of Digital-Based Service Innovation for Old Age Insurance (JHT) Claims by BPJS Employment (BPJAMSOSTEK) Pekalongan Branch Office Central Java

Various government efforts to break the Covid-19 chain have also affected the economy, as many companies have laid off employees on a large scale. This has resulted in an increase in the number of claims for the Social Security Administering Body (BPJS) for Employment or BPJAMSOSTEK. The purpose of the study was to find out a Case Study of Digital-Based Service Innovation for Old Age Security Claims (JHT) by BPJS Ketenagakerjaan (BPJAMSOSTEK) Pekalongan Branch Office, Central Java. Research methods. The research method used to describe the problems that exist in this study is a qualitative method with a study approach. Primary data sources in this study came from interviews with informants. The informants in this case are employees who are directly involved in the implementation of public services, leaders and participants as users of services provided by BPJAMSOSTEK Pekalongan City Branch, Central Java. The technique used in this study was carried out in several steps, namely, data reduction (sorting, focusing and attention), data presentation (display) and drawing conclusions. Research result. The innovation attributes at BPJAMSOSTEK Pekalongan City Branch are in accordance with the relative advantage, suitability, complexity, possibility to try and ease of observation. In terms of acceptance of the information system, it is seen from 2 elements, namely the ease of use and the usefulness of the LAPAKASIK information system in accordance with the Theory Technology Acceptance Model (TAM): In the Internal User/BPJAMSOSTEK Aspect In the External Aspect User/BPJAMSOSTEK Participant.

INOVASI PELAYANAN PUBLIK MELALUI APLIKASI “E-DUKCAPIL” PEMBUATAN KARTU KELUARGA PADA DINAS KEPENDUDUKAN DAN PENCATATAN SIPIL KABUPATEN KARAWANG

This study aims to analyze public service innovations through the application "E-dukcapil" in making family cards at the Department of Population and Civil Registration, Karawang Regency. The research conducted is qualitative research, in this research is descriptive in nature, namely to describe the reality of the events under study. The focus of this research is using the innovation attribute theory by Rogers, namely: (1) relative advantage, (2) suitability, (3) complexity, (4) possibility of experimentation, (5) ease of observation. Through observation data collection techniques, in-depth interviews and documentation. With the number of informants as many as 3 people. The results showed that the innovation of family card services through the "E-dukcapil" application was not entirely ideal. This is because the application has only been implemented for 3 months, and problems such as server disruptions are still common. Lack of public understanding of the use of information technology and the lack of human resources of the implementing apparatus, namely the number of Civil Servants (PNS) in the Department of Population and Civil Registration of Karawang Regency, which is only equivalent to 40 people.

Inovasi Layanan Aplikasi e-Samsat Dalam Pembayaran Pajak Kendaraan Bermotor Di Provinsi Riau

With the number of tax payment services at the Samsat office in Riau province, the community needs service innovation that is easier to access payment services for motorized vehicle taxes.So that the E-samsat service application emerged ,which is an online application that aims to serve and facilitate the public in paying motorized vehicle taxes.The purpose of this study is to describe in depth the innovation of the E-Samsat application service in the payment of motor vehicle tax in Riau Province as a form of excellent service at the E-Samsat office of Riau Province.This study uses the theory of Everett M.Rogers(2003) in Suwarno (2008:17). In its application,innovation has attributes inherent in the innovation.The innovation attributes referred to are as follows : Relative Advantage, Compatibility, Complexity,Triability (possibility to be tried),Observability (easily observed).The research method used in this research is descriptive method qualitative data collection techniques through interviews, observation and documentation. Data collection, data reduction, and drawing conclusions made on data analysis techniques.The results of this study indicate that the Relative Advantage is the easiness of the community in handling motorized vehicle tax payments (PKB).Compatibility (suitability) where the E-Samsat service innovation for the people of Pekanbaru city is in accordance with the current conditions of technological development. Complexity in which the innovation of E-Samsat services is not considered complicated in the implementation process.Then Triability (possibly tested) the people of Pekanbaru City who responded positively to the existence of E-Samsat service. Furthermore from Observability (ease of observation) with fairly simple service procedures electronically.&#x0D; Keywords : Innovation, Service, E- Samsat Riau Province

INOVASI PELAYANAN ADMINISTRASI KEPENDUDUKAN ( Studi Kasus Pada Pelayanan Lempeng Gapit di Dinas Kependudukan dan Pencatatan Sipil Kota Madiun)

The death certificate is an important document for individuals and countries because ownership of a death certificate can be used for insurance, retirement, inheritance management and the determination of a widow or widower in the National Identity Card. For Countries, deeds are also important as the statistical. The lack of public awareness in Madiun regarding the ownership of a death certificate has prompted the Madiun City government to create an innovative death certificate service, namely “Lempeng Gapit”, or better known as “One-day Service for Managing Population Document and Civil Registration Officers who send it and get there”. This research aims to explain about the attributes or characteristics of “Lempeng Gapit” innovation in Madiun City using the Rogers 2003 theory which there are 5 dimensions, namely Relative Advantage, Suitability, Complexity, Possibility to Try, and Ease of Observation. The type of research is a qualitative descriptive research method. Sources of data in this tudy consisted of primary data sources, namely several informants and secondary data sources in the form of documents related to research. The data collection technique is structured documentation interviews. The data analysis technique is an interactive data analysis consisting of data reduction, data presentation, conclusions, and verification. In maintaining the validity of the research data, this study used source triangulation technique and triangulation methods. The results showed that the existence of “Lempeng Gapit” innovation made it easier for people to obtain a death certificate and “Lempeng Gapit” innovation in Madiun City can efficiently time, energy and costs in providing services of population administration.

Ethnozoology in the mountains. What does the cognitive salience of wild animals tell us?

In recent times, ethnobiology has revived interest in cognitive aspects of humans’ communities. A concept commonly used in this area is cognitive salience. In this paper we assess the wild animal salience meaning for the rural people from an area of the mountain range of the Cordoba province (Argentina). We also analyzed the relationship of cultural and ecological factors over wild animal domain salience. The values of cognitive salience, perception and cultural value were obtained by means of free lists to 16 collaborators, while semi-structured interviews were used to inquire about local ecological knowledge and ease of observation about wild animals. The interdependence between the five variables elaborated was analyzed through a Principal Components Regression. The results show a qualitative relationship between Cognitive Salience and Cultural Value and a significant correlation between Cognitive Salience and Local Ecological Knowledge. Ease of Observation did not correlate with Cognitive Salience, but show a significant relationship with the Perceived Abundance. The results suggest a complex network of factors that are modeling the cognitive salience and local perceptions over wild animals. In our findings, highlight the Cultural Value given to harmful animals which reflects an increasing pattern in the region, the conflict between rural people and wild animals. In turn a mutual influences and causal feedback loops between cognitive salience and an ecological factor, the Perceived abundance, is proposed. Investigations over cognition and about how people perceived nature can give us an idea of how they act in it, a compelling factor when it comes to cultural and biological conservation issues.

Maximizing farm-level uptake and diffusion of biological control innovations in today’s digital era

When anthropologists interviewed Honduran and Nepali smallholders in the mid-1990s, they were told that “Insects are a terrible mistake in God’s creation” and “There’s nothing that kills them, except for insecticides”. Even growers who maintained a close bond with nature were either entirely unaware of natural pest control, or expressed doubt about the actual value of these services on their farm. Farmers’ knowledge, beliefs and attitudes towards pests and natural enemies are of paramount importance to the practice of biological control, but are all too often disregarded. In this study, we conduct a retrospective analysis of the extent to which social science facets have been incorporated into biological control research over the past 25 years. Next, we critically examine various biological control forms, concepts and technologies using a ‘diffusion of innovations’ framework, and identify elements that hamper their diffusion and farm-level uptake. Lastly, we introduce effective observation-based learning strategies, such as farmer field schools to promote biological control, and list how those participatory approaches can be further enriched with information and communication technologies (ICT). Although biological control scientists have made substantial technological progress and generate nearly 1000 papers annually, only a fraction (1.4%) of those address social science or technology transfer aspects. To ease obstacles to enhanced farmer learning about biological control, we describe ways to communicate biological control concepts and technologies for four divergent agricultural knowledge systems (as identified within a matrix built around ‘cultural importance’ and ‘ease of observation’). Furthermore, we describe how biological control innovations suffer a number of notable shortcomings that hamper their farm-level adoption and subsequent diffusion, and point at ways to remediate those by tactical communication campaigns or customized, (ICT-based) adult education programs. Amongst others, we outline how video, smart phones, or tablets can be used to convey key ecological concepts and biocontrol technologies, and facilitate social learning. In today’s digital era, cross-disciplinary science and deliberate multi-stakeholder engagement will provide biocontrol advocates the necessary means to bolster farmer adoption rates, counter-act surging insecticide use, and restore public trust in one of nature’s prime services.

Tardigrades in Space Research - Past and Future

To survive exposure to space conditions, organisms should have certain characteristics including a high tolerance for freezing, radiation and desiccation. The organisms with the best chance for survival under such conditions are extremophiles, like some species of Bacteria and Archea, Rotifera, several species of Nematoda, some of the arthropods and Tardigrada (water bears). There is no denying that tardigrades are one of the toughest animals on our planet and are the most unique in the extremophiles group. Tardigrada are very small animals (50 to 2,100 μm in length), and they inhabit great number of Earth environments. Ever since it was proven that tardigrades have high resistance to the different kinds of stress factors associated with cosmic journeys, combined with their relatively complex structure and their relative ease of observation, they have become a perfect model organism for space research. This taxon is now the focus of astrobiologists from around the world. Therefore, this paper presents a short review of the space research performed on tardigrades as well as some considerations for further studies.

祁连山不同植被类型的物候变化及其对气候的响应

PDF HTML阅读 XML下载 导出引用 引用提醒 祁连山不同植被类型的物候变化及其对气候的响应 DOI: 10.5846/stxb201510092039 作者: 作者单位: 西北师范大学地理与环境科学学院,西北师范大学地理与环境科学学院 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金资助项目（41161017） Phenological variation in different vegetation types and their response to climate change in the Qilian Mountains, China, 1982-2014 Author: Affiliation: northwest normal university,northwest normal university Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:基于1982-2006年GIMMS NDVI和2000-2014年MODIS NDVI遥感数据，利用double logistic拟合方法提取了1982-2014年祁连山区不同植被的生长季始期、生长季末期和生长季长度3个重要的物候参数，分析了不同植被物候期的时间变化趋势、空间分异特征及对气候因子的响应。结果表明：（1）祁连山区不同植被的生长季始期和生长季末期随年际变化表现出波动提前或推迟，其中沼泽植被的变化波动最大；草甸植被、灌丛植被、阔叶林植被和栽培植被生长季长度出现延长趋势；（2）祁连山区植被生长季始期集中在5月初，其中阔叶林植被生长季开始最早，荒漠植被生长季开始最晚，植被生长季末期集中在9月，栽培植被生长季结束较早，荒漠植被、沼泽植被生长季结束较晚，植被生长季长度集中在110-140 d，其中阔叶林植被、针叶林植被生长季长度较长，而荒漠植被、高山植被生长季长度较短；（3）祁连山植被物候期变化趋势的空间分布表明植被生长季始期、生长季末期主要表现为提前不明显和推迟不明显，生长季长度主要表现为缩短不明显和延长不明显；（4）物候要素与气候要素相关性表明前期温度的积累有利于植被的开始生长，但当年3月的降水量对植被生长季始期同样有重要作用，不同植被生长季末期与8月、9月温度相关性较大，而与10月、11月降水的相关性较大。 Abstract:Vegetation phenology is used in the study of climate change because of stable distribution, and ease of observation and interpretation. In this study, a 15-day time series of averaged normalized difference vegetation indices (NDVI) derived from the daily Global Inventory Modeling and Mapping Studies (GIMMS) NDVI dataset and 16-day averaged NDVI values derived from the daily Moderate Resolution Imaging Spectroradiometer (MODIS) NDVI dataset were used to analyze trends in vegetation phenology. Firstly, using the ENVI tool to cut remote sensing data, NDVI time series data for the study area from 1982 to 2014 were obtained. Secondly, using a Savitzky-Golay filter, noise contamination caused by random factors was reduced by producing a smooth NDVI curve. Thirdly, using double logistic fitting, three important phenological parameters, including the start of growing season (SOS), the end of growing season (EOS), and the length of growing season (LOS) were extracted for different vegetation types. Temporal change trends, as well as its spatial distribution characteristics, of the nine major vegetation types in the Qilian Mountains were analyzed. These types included meadow, steppe, desert vegetation, shrub vegetation, alpine vegetation, coniferous forest, broad-leaved forest, cultivated vegetation, and swamp vegetation. In addition, the effects of climatic factors on phenology were analyzed by correlation analysis. The results showed that:(1) The annual variation of SOS and EOS of different vegetation types in the Qilian Mountains fluctuated in its advance or or delay; the maximum variation was observed in the swamp vegetation. The LOS of meadow, shrub, coniferous forest, and cultivated vegetation was longer, but the LOS of desert vegetation shortened. (2) The SOS of vegetation was primarily in May; the growing season of the broad-leaved forests began the earliest and desert vegetation began the latest. The EOS of vegetation occurred primarily in September; the growing season of cultivated vegetation ended earlier, whereas the growing season of the desert and swamp vegetation ended later. The LOS of vegetation was from 110 days to 140 days, among which the LOS of broad-leaved and coniferous forests was longer, whereas the LOS of desert and alpine vegetation was shorter. (3) The spatial distribution of variation trends for vegetation phenology indicated that SOS and LOS were advanced or delayed but not substantially, and the LOS was primarily shortened or prolonged, but not substantially. (4) The correlation of phenological metrics and climatic factors indicated that the accumulation of early stage temperature was beneficial to the growth of vegetation, but the amount of precipitation in March was also important to the SOS of vegetation. The EOS of different vegetation types was related with temperature in August and September, and correlated with precipitation in October and November, but the correlation was not significant. At different altitudes, the phenological parameters were different. In particular, the LOS appeared to shorten with increasing elevation, which is consistent with the spatial distribution of phenological parameters. These results explain the relationship between climate change and phenological phases. Climate change has an obvious effect on vegetation phenological parameters, and the phenological period can explicitly indicate the climate change. 参考文献 相似文献 引证文献