Qinba Mountains Research Articles

Characteristics of Molecular Evolution of Toxicodendron vernicifluum in Qinba Mountains by nrDNA ITS and cpDNA Sequence

Characteristics of Molecular Evolution of Toxicodendron vernicifluum in Qinba Mountains by nrDNA ITS and cpDNA Sequence

Phenylpropanoid glycosides from the roots of Jasminum giraldii

As part of our ongoing research in medicinal herbs of Qinba Mountains in China, the plant Jasminum giraldii was chemically investigated. Four new phenylpropanoid glycosides, 9-O-(E-cinnamoyl)-coniferin (1), 6′-O-(E-cinnamoyl)-coniferin (2), 6′-O-(E-cinnamoyl)-syringin (3) and 2′-O-(E-cinnamoyl)-syringin (4), together with two known phenylpropanoid glucosides, coniferin (5) and ethylsyringin (6) were obtained from the roots of Jasminum girialdii. The structures of these compounds have been characterized according to spectral evidences and named on basis of their biosynthetic pathway. In addition, in vitro cytotoxic activities of these compounds were evaluated, however, none of these compounds showed cytotoxicity.

Genetic evidence for central‐marginal hypothesis in a Cenozoic relict tree species across its distribution in China

AbstractAimThis study tests predictions of the central‐marginal (C‐M) hypothesis using geographical patterns of genetic variation in a Cenozoic relict tree species Euptelea pleiospermum. Additionally, we explore the extent to which post‐glacial recolonization and landscape barriers created by topographical heterogeneity shape spatial genetic variation.LocationSouth‐west and central subtropical China.MethodsUsing microsatellite data of 678 individuals from 21 populations, we documented geographical patterns of genetic diversity and population genetic structure, supplemented with current and past (Last Glacial Maximum, LGM) distributions based on species distribution models (SDMs). Genetic structure was determined by non‐spatial and spatially sensitive Bayesian clustering, analysis of molecular variance, barrier analysis and a multivariate population graphing approach. We also examined both historical and contemporary gene flow.ResultsGenetic diversity significantly declined with distance from centre and showed unimodal patterns along both latitude and longitude. The C‐M pattern of genetic diversity along latitudinal gradient is high‐latitude‐skewed, with the peak at higher portion of the species' latitudinal extent. The Sichuan Basin divided individuals into south and north clusters, whereas the Qinba Mountains did not. The general shape of the predicted distribution during the LGM is strongly similar with that of current distribution, except the Sichuan Basin.Main conclusionsOur study provides genetic evidence for the C‐M hypothesis in a Cenozoic relict tree species across its distribution in China. The Sichuan Basin, rather than the Qinba Mountains, acts as dispersal barrier for a mountain tree species. Our results suggest that in situ refugia were maintained across southwest and central China during the LGM. The slight post‐glacial northward expansion and asymmetrical south–north historical‐gene flow did not result in a low‐latitude‐skewed C‐M pattern of genetic diversity. Instead, complex topography in combination with the C‐M dispersal dynamics shaped the latitudinal pattern of genetic diversity.

Vegetation dynamics in Qinling-Daba Mountains in relation to climate factors between 2000 and 2014

Using the Moderate Resolution Imaging Spectroradiometer-normalized difference vegetation index (NDVI) dataset, we investigated the patterns of spatiotemporal variation in vegetation coverage and its associated driving forces in the Qinling-Daba (Qinba) Mountains in 2000–2014. The Sen and Mann–Kendall models and partial correlation analysis were used to analyze the data, followed by calculation of the Hurst index to analyze future trends in vegetation coverage. The results of the study showed that (1) NDVI of the study area exhibited a significant increase in 2000–2014 (linear tendency, 2.8%/10a). During this period, a stable increase was detected before 2010 (linear tendency, 4.32%/10a), followed by a sharp decline after 2010 (linear tendency,–6.59%/10a). (2) Spatially, vegetation cover showed a “high in the middle and a low in the surroundings” pattern. High values of vegetation coverage were mainly found in the Qinba Mountains of Shaanxi Province. (3) The area with improved vegetation coverage was larger than the degraded area, being 81.32% and 18.68%, respectively, during the study period. Piecewise analysis revealed that 71.61% of the total study area showed a decreasing trend in vegetation coverage in 2010–2014. (4) Reverse characteristics of vegetation coverage change were stronger than the same characteristics on the Qinba Mountains. About 46.89% of the entire study area is predicted to decrease in the future, while 34.44% of the total area will follow a continuously increasing trend. (5) The change of vegetation coverage was mainly attributed to the deficit in precipitation. Moreover, vegetation coverage during La Nina years was higher than that during El Nino years. (6) Human activities can induce ambiguous effects on vegetation coverage: both positive effects (through implementation of ecological restoration projects) and negative effects (through urbanization) were observed.

陕南秦巴山区厚朴群落土壤肥力评价

PDF HTML阅读 XML下载 导出引用 引用提醒 陕南秦巴山区厚朴群落土壤肥力评价 DOI: 10.5846/stxb201502020266 作者: 作者单位: 西北农林科技大学生命科学学院 杨凌,西北农林科技大学生命科学学院 杨凌,陕西省水土保持生态环境监测中心 西安,西北农林科技大学生命科学学院 杨凌,西北农林科技大学生命科学学院 杨凌,西北农林科技大学生命科学学院 杨凌,西北农林科技大学生命科学学院 杨凌 作者简介: 通讯作者: 中图分类号: 基金项目: 陕西省农业攻关项目（2013K01-06）；中医药行业科研专项（201207002）；中医药公共卫生专项（财社[2011]76号） Soil fertility quality assessment of Magnolia officinalis communities in Qinba mountains Author: Affiliation: Northwest A&F University,,,,,,Northwest A&F 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:以秦巴山区7个厚朴群落为对象，分析土壤养分含量的变化规律，同时对各群落土壤肥力进行评价，以期为该区土壤肥力的提高和厚朴群落配置模式的筛选提供理论依据和实践指导。结果表明，秦巴山区厚朴群落间土壤养分含量差异显著；除全磷和全钾外，随土层深度的增加，土壤有机质、全氮、碱解氮、速效磷和速效钾含量逐渐减小。厚朴群落土壤肥力综合指数从大到小依次为：4a凹叶厚朴（1.054） > 2a凹叶厚朴（0.882） > 山茱萸-凹叶厚朴混交林（0.673） > 7a尖叶厚朴（-0.243） > 7a凹叶厚朴（-0.713） > 杜仲-凹叶厚朴（-0.812） > 11a凹叶厚朴（-0.840）。因此随着林龄的增大，厚朴群落土壤肥力有下降的趋势。结合厚朴群落土壤养分差异分析和厚朴群落土壤肥力评价结果，得出山茱萸-凹叶厚朴混交林的土壤肥力相对较好，为该区植被恢复的最佳营造模式。 Abstract:Soil fertility is a reflection of the basic properties and essential features of the soil, and fertile soils can provide indispensable nutrients for plant growth. Soil nutrients are one of the most important parameters for the evaluation of soil fertility. Spatial orientation and distribution of soil nutrients directly affect the level of soil fertility and ecological restoration. Magnolia officinalis is a traditional medicinal tree species in China, and it is often used as the preferred tree on Qin-Ba Mountain. In order to clarify the distribution of soil nutrients and soil fertility status of different Magnolia officinalis communities on Qin-Ba Mountain, five communities were analyzed: 2-year-old, 4-year-old, 7-year-old, and 11-year-old Magnolia officinalis and 7-year-old Magnolia officinalis officinalis. Two other plant communities were also selected: Eucommia ulmoides-Magnolia officinalis and Macrocarpium officinale-Magnolia officinalis. The soil nutrients of the seven communities were determined using one-way analysis of variance, and the soil integrated fertility index of the seven communities was evaluated using the improved analytic hierarchy process. The results showed that the soil nutrients of the seven communities in the same soil layers were significantly different (P < 0.05). In addition, the parameters in different soil layers also differed remarkably. Soil organic matter, total N, available N, available P, and available K in the seven communities decreased with soil depth in the profile distribution; however, total P and total K did not show any specific characteristics. A comprehensive evaluation showed that the soil integrated fertility index of 4-year-old Magnolia officinalis was the highest (1.054) among the seven communities, while that of 11-year-old Magnolia officinalis was the lowest (-0.840). With the growth of plantations, soil fertility of Magnolia officinalis communities has declined. Soil fertility of Macrocarpium officinale-Magnolia officinalis (0.673) was higher than that of 7-year-old Magnolia officinalis, whereas the soil fertility of Eucommia ulmoides-Magnolia officinalis (-0.812) was lower than that of 4-year-old Magnolia officinalis. Therefore, Macrocarpium officinale-Magnolia officinalis could improve soil fertility on Qin-Ba Mountain. 参考文献 相似文献 引证文献

A Study on the Coordinated Development of the Urban Areas around the Qinba Mountains

A Study on the Coordinated Development of the Urban Areas around the Qinba Mountains

Intraspecific morphological variation of the scorpionfly Dicerapanorpa magna (Chou) (Mecoptera: Panorpidae) based on geometric morphometric analysis of wings

Wing shape variation was investigated between the sexes and among four populations of the scorpionfly Dicerapanorpa magna (Chou, 1981) endemic to the Qin-Ba Mountains area, China through the landmark-based geometric morphometric approach. The results show that sexual dimorphism exists both in wing size and shape in D. magna. Significant differences exist in female wing size and shape among D. magna populations. The possible reasons of the wing variation are discussed based on the divergence time of D. magna in combination with the tectonic and climatic events in the Qin-Ba Mountains during the late Miocene-Pleistocene period. Whether reproductive isolation exists between different populations needs further research.

Positive association of neuroligin-4 gene with nonspecific mental retardation in the Qinba Mountains Region of China

Neuroligin-4 is essential for proper brain function. Some studies indicate a close relationship between neuroligin-4 and several human psychiatric conditions. The case-control method was used to study the association between nonspecific mental retardation (NSMR) and genetic variants of neuroligin-4 gene (NLGN4). Five single nucleotide polymorphisms (SNPs: rs5916271, rs7049300, rs6638575, rs3810686, and rs1882260) were genotyped by PCR-RFLP/SSCP method in the NLGN4. Individual SNP analysis shows significant differences at SNPs rs3810686 and rs1882260 for allele frequency when NSMR cases and controls [odds ratio (OR)=1.589, 95% confidence interval (CI)=1.035-2.438, chi2=4.53, df=1, P=0.033; OR=2.050, 95% CI=1.211-3.470, chi2=7.38, df=1, P=0.007, respectively] were compared. Further haplotype analysis indicates that there are two haplotype sets, rs3810686-rs1882260 and rs6638575-rs3810686-rs1882260, which show statistical differences between NSMR cases and controls (chi2=6.79, df=2, global P=0.034; chi2=9.29, df=2, global P=0.0096, respectively). The results suggest a positive association between the genetic variants of the NLGN4 and NSMR in the Chinese children from Qinba Mountains Region.

Fusarium solani, Tax-3, a new endophytic taxol-producing fungus from Taxus chinensis

An endophytic fungus, Tax-3, was isolated from barks of Taxus chinensis grown in the Qinba mountains, China. The strain was classified into Fusarium solani based on the morphological characteristics and the molecular phylogenetics inferred from the nuclear ribosomal DNA ITS sequences with the sequence similarity values of 100%. High performance liquid chromatography (HPLC) assay showed the F. solani, Tax-3, produced taxol with a higher yield of 163.35 μg/L in the reformative potato dextrose liquid medium (d), revealing its potential applications for taxol production.

Ecosystem services and their values: a case study in the Qinba mountains of China

AbstractTerrestrial ecosystem services can provide both direct and indirect economic benefits. In this case study, we estimated the annual economic value of some ecosystem services provided by terrestrial ecosystems in the Qinba mountains of Shaanxi Province of China, using both simulation models and a geographic information system that helps to analyze the effect of ecological factors on ecosystem functions. With respect to differences in vegetation types and their coverage, by combining the latest research, and using theory and methods for the value of terrestrial ecosystem services, we not only calculated goods produced by different types of vegetation but also estimated the value of various terrestrial ecosystem services. We also set up a database and an eco‐account of a terrestrial ecosystem. The ecosystem services assessed relate to the following aspects: the vegetation's primary productivity, soil and fertility conservation, water conservation, carbon fixation and oxygen supply. The total economic value of terrestrial ecosystem services in the Qinba mountains was estimated to be 968.33 billion renminbi per year, and represents a part of the actual ecosystem services. In addition, we analyzed the spatial distribution of the vegetation based on the economic values of the terrestrial ecosystem services. Our findings can contribute to the conservation of these terrestrial ecosystems and the effective use of these ecosystem services.