Two New Species of Allodiatrype from Monsoon Evergreen Broad-leaved Forest in Pu’er, Yunnan, China

PDF HTML阅读 XML下载 导出引用 引用提醒 普洱季风常绿阔叶林次生演替中木本植物幼苗更新特征 DOI: 10.5846/stxb201108101174 作者: 作者单位: 中国林业科学研究院资源昆虫研究所,中国林业科学研究院资源昆虫研究所,中国林业科学研究院资源昆虫研究所,中国林业科学研究院资源昆虫研究所,普洱市林业科学研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金资助项目(CAFYBB2008001, riricaf 201002M) Woody seedling regeneration in secondary succession of monsoon broad-leaved evergreen forest in Puer, Yunnan, Southwest China Author: Affiliation: Research Institute of Resource Insects,Chinese Academy of Forestry,Research Institute of Resource Insects,Chinese Academy of Forestry,Research Institute of Resource Insects,Chinese Academy of Forestry,Research Institute of Resource Insects,Chinese Academy of Forestry,Forestry Research Institute of Pu''er Municipality 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:以时空替代的方法,将针阔混交林、季风常绿阔叶林的次生林与成熟林等3个处于同一空间下的群落作为次生演替进程中的3个阶段,研究云南普洱地区次生演替过程中的木本植物幼苗更新特征,分析了次生演替过程中木本植物幼苗的物种组成、密度、高度级及与环境因子的相关性。结果表明:在8个共144 m2的幼苗样地中调查木本植物幼苗101种2014株,其中乔木幼苗是主要组成。随着次生演替的进行,木本植物幼苗、乔木与藤本幼苗密度逐渐增加,灌木幼苗密度无显著变化;藤本植物幼苗的物种丰富度随着次生演替进行而增加,乔木与灌木幼苗则无显著变化,成熟季风常绿阔叶林中木本植物幼苗Shannon-Wiener指数要显著小于针阔混交林与次生季风常绿阔叶林。次生与成熟季风常绿阔叶林木本植物幼苗多度随高度级增加而减少,针阔混交林则呈现偏峰曲线,幼苗密度均集中分布在高度20 cm以内,3个群落演替阶段木本植物幼苗物种丰富度随高度级增加呈现偏锋曲线。相似性系数反映出乔木和藤本幼苗的更新来源与群落的物种组成存在着紧密的联系。乔木幼苗密度分布与样地坡度之间存在着显著的负相关,灌木幼苗密度与土壤pH值之间存在着显著正相关。 Abstract:Seedling, made up of small individuals of woody plant species in the understorey, is an important component of many forests and considered as an important source for natural restoration in forest ecosystems. Simultaneously seedling plays an important role in the regeneration of numerous tree species. Based on space-for-time substitution method, we treated coniferous and broad-leaved mixed forest, secondary monsoon evergreen broad-leaved forest (MEBF), primary MEBF in the same area as three different stages of secondary succession of MEBF. Eight sampling plots representing the three different stages distribute in Caiyanghe nature reserve, surrounding the areas of Meizihu and Xinfang reservoir of Puer, in Yunnan Province, the southwest of China. We investigated seedling regeneration characteristics of woody plants of MEBF during secondary succession by looking at species composition, density, height level and the relationship with environmental factors. Overall, we found 2014 individuals of woody seedlings belonging to 101 species (dominated by understory tree species) in the eight plots covering 144-m2 area. The species richness of tree seedling, shrub seedling and liana seedling were 50, 29 and 22 respectively, and their corresponding individuals were 1499, 299 and 216. Tree seedling was the main component of woody plant seedling, such as Castanopsis echidnocarpa. Pinus kesiya var. langbianensis are dominant species in coniferous and broad-leaved mixed forest, however, their seedlings rarely appeared in the understory. The pine seedling stages need more light than shade-tolerant species which can conserve seedling bank in understory and waited for appropriate chance to regeneration. The woody plant seedling density of coniferous and broad-leaved mixed forest, secondary and mature MEBF was 183±5.69, 240±20.31 and 372.5±4.5 individuals per 18m2. As succession progresses, the density of total woody seedlings, tree seedlings and liana seedlings all increased, while the density of shrub seedlings did not change significantly. Celastrus virens as a liana was particularly conspicuous in mature MEBF. Species richness of liana seedlings tended to increase, while species richness of tree seedlings and shrub seedlings remained relatively stable along the succession gradient. The Shannon-Wiener index of woody seedlings was significantly lower in primary MEBF than those in mixed forest and secondary MEBF. The abundance of woody seedlings in secondary and primary MEBF decreased with the increase of height level, while in mixed forest, the abundance of woody seedlings form a unimodal pattern with peak at 20 cm. Species richness, however, showed consistent (increasing or decreasing) pattern with the increase of height level in all these forest types. Distribution of woody seedlings abundance concentrated in 0-20 cm in the three community types. Woody seedlings species richness of mature MEBF was significantly lower than coniferous and broad-leaved mixed forest when height level was at Ⅰand Ⅱ. Sørensen index indicated a close link between tree and liana seedlings and the species composition of the community. Moreover, tree seedling density distribution was significantly negatively correlated with the slope of the plot, while shrub seedling density was significantly positively related to soil pH. 参考文献 相似文献 引证文献

PDF HTML阅读 XML下载 导出引用 引用提醒 鼎湖山不同演替阶段森林土壤水分时空变异研究 DOI: 10.5846/stxb201912022603 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（31600353，41430529）；广东省自然科学基金项目（2016A030310450）；广东省林业科技创新平台项目（2020-KYXM-09） Temporal and spatial variability of soil moisture in a forest succession series in Dinghushan Author: Affiliation: 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:土壤水分作为森林生态系统水分蓄库的主体，森林土壤水分储量及其时空动态与变异对揭示区域植被恢复与气候变化背景下的森林生态系统水文过程响应与服务功能变化机制具有重要意义。本研究以南亚热带地区典型森林植被演替序列马尾松人工林（Pinus massoniana coniferous forest，PF）-马尾松针阔叶混交林（mixed Pinus massoniana/broad-leaved forest，MF）-季风常绿阔叶林（monsoon evergreen broad-leaved forest，MEBF）为研究对象，依托中国生态系统研究网络森林样地建设与监测统一规范对鼎湖山森林生态系统定位站站区内分布的上述森林类型土壤水分的长期定位观测（2005-2015年），通过分析各演替阶段森林土壤不同土层（0-15、15-30、30-45、45-60、60-75和75-90 cm）土壤体积含水量观测数据，探究该区域森林植被恢复过程中的土壤水分变化及其时空变异。结果表明：在雨热同期且干湿季明显的南亚热带地区，鼎湖山森林土壤储水量及其时间动态受降雨量的影响显著，森林土壤层对降雨具有强烈的调蓄和稳定作用，伴随PF→MF→MEBF自然演替进程，调蓄水分能力逐步增强。林型间，由初期阶段PF到顶级群落MEBF，森林土壤水分储量逐渐提高，且演替后期林型相对于早期林型，土壤储水量均呈现为较小的年际与年内变幅。干、湿季而言，干季时林型间的土壤储水量差异大于湿季，干季时MEBF和MF土壤含水量分别是PF的1.33倍和1.11倍。从土壤含水量的干、湿季期间变异来看，不同林型各土层土壤含水量的变异系数大小均表现为干季大于湿季；垂直剖面方向上，突出表现为无论干湿季MEBF各层土壤含水量变异均比其他两种林型较为缓和，充分体现了MEBF优越的土壤水分时空调配能力。整体上，伴随PF→MF→MEBF自然演替进程，土壤水分储量及其稳定性逐步提升。 Abstract:Soil moisture is the main component of water storage in forest ecosystems. The soil water reserve of forests and its spatiotemporal dynamics and variations are of great significance for revealing the response of hydrological processes and the change mechanism of service functions in forest ecosystems under the background of regional vegetation restoration and climate change. In this study, we focused on the typical forests in lower subtropical China: a Pinus massoniana forest (PF), mixed Pinus massoniana/broad-leaved forest (MF), and monsoon evergreen broad-leaved forest (MEBF), which formed a natural successional sequence in this region. Based on the unified standards for the construction and monitoring of forest plots by the Chinese Ecosystem Research Network, long-term positioning observation of soil moisture in the above forest types of the Dinghushan Forest Ecosystem Research Station was conducted during the 2005-2015 period. Through analysis of the measured soil volumetric water content in different soil layers (0-15, 15-30, 30-45, 45-60, 60-75 and 75-90 cm) of the above mentioned forests at each stage of succession, the change in soil water storage and its spatiotemporal variation in the process of forest vegetation restoration in this region were explored. The data showed that in the southern subtropical regions with simultaneous rain and heat and distinct dry and wet seasons, soil water storage and its seasonal dynamics in Dinghushan were significantly affected by rainfall, and the soil layer had a strong regulatory and stabilizing effect on rainfall. With natural succession from the planted (PF) to the climax (MEBF) stage, the ability to regulate and store water gradually increased. Among forest types, from the initial stage (PF) to the top community (MEBF), the soil water storage of the forest ecosystem gradually increased, and compared with the early forest types, the soil water storage of late succession forest types showed small interannual and intra-annual variation. At a seasonal scale, the difference in soil water storage between forest types in the dry season was greater than that in the wet season. The soil water content of MEBF and MF in the dry season was 1.33 times and 1.11 times that of PF, respectively. According to the variation in the soil water content in dry and wet seasons, the coefficient of variation of the soil water content in each soil layer of the different forest types was greater in the dry season than in the wet season. In the vertical direction, this coefficient of variation highlighted that the variation in the soil water content in each layer of MEBF was more moderate than that in the other two forest types in both the dry and wet seasons, which reflected the superior water regulation ability of MEBF. On the whole, with natural succession from the planted (PF) to the climax (MEBF) forest, the soil water storage and its stability improved. 参考文献 相似文献 引证文献

The effects of elevated nitrogen deposition on soil microbial biomass carbon (C) and extractable dissolved organic carbon (DOC) in three types of forest of southern China were studied in November, 2004 and June, 2006. Plots were established in a pine forest (PF), a mixed pine and broad-leaved forest (MF) and monsoon evergreen broad-leaved forest (MEBF) in the Dinghushan Nature Reserve. Nitrogen treatments included a control (no N addition), low N (50 kg N/(hm2·a)), medium N (100 kg N/(hm2·a)) and high N (150 kg N/(hm2·a)). Microbial biomass C and extractable DOC were determined using a chloroform fumigation-extraction method. Results indicate that microbial biomass C and extractable DOC were higher in June, 2006 than in November, 2004 and higher in the MEBF than in the PF or the MF. The response of soil microbial biomass C and extractable DOC to nitrogen deposition varied depending on the forest type and the level of nitrogen treatment. In the PF or MF forests, no significantly different effects of nitrogen addition were found on soil microbial biomass C and extractable DOC. In the MEBF, however, the soil microbial biomass C generally decreased with increased nitrogen levels and high nitrogen addition significantly reduced soil microbial biomass C. The response of soil extractable DOC to added nitrogen in the MEBF shows the opposite trend to soil microbial biomass C. These results suggest that nitrogen deposition may increase the accumulation of soil organic carbon in the MEBF in the study region.

Nitrogen and phosphorus status and their influence on aboveground production under increasing nitrogen deposition in three successional forests

Aims Assessment of the ecological benefits of forest in soil water retention based on conventionally monitored factors and exploration of the relation between forest carbon-sink function and hydrological benefits has special meaning in Millennium Ecosystem Assessment.Our objectives were to 1) characterize the spatial and temporal variations of soil moisture in three subtropical forests and 2) determine the controlling action of soil organic matter on soil moisture retention during vegetation succession.Methods Standard plots were established in Pinus massonniana coniferous forest(PF),mixed Pinus massonniana-broad-leaved forest(PBF) and monsoon evergreen broad-leaved forest(MBF).We measured soil water content every 10 days from 2002 to 2008 using neutron probes and analyzed soil organic matter content in the laboratory by the potassium dichromate oxidation method.Important findings With natural succession from planted PF to climax MBF,soil water content(0–30 cm soil layer) increased significantly;soil water content was highest in MBF and lowest in PBF.The distribution patterns of soil moisture in the three forests were different: the soil moisture of MBF decreased with soil depth,was more homogeneous in the soil profile in PBF and was lower at the surface than in deeper layers in PF.The soil water characteristic curves showed that under the same matrix suction the magnitude of soil water content(0–40 cm soil layer) was: MBF PBF PF;the soil of MBF was the most retentive.Further analysis indicated that soil porosity had the greatest impact on soil moisture,followed by saturated soil water content and soil organic matter content,while soil bulk density had a minimal impact.In the process of natural succession,soil moisture was significantly correlated with the soil organic matter content(p = 0.014),as the soil organic matter could affect soil moisture holding(p = 0.030).Accordingly,we recommend soil organic matter as an effective and integrated index for appraising forest ecosystem services.

Sequential soil coring and in situ exposure of largely undisturbed soil columns technique was used to study the nitrogen mineralization of five forest types soils in the east side of Gaoligongshan mountains, which were Dry-Hot Vally (D), Montane Rain Forest (MR), Monsoon Evergreen Broad-leaved Forest (M), the Mid-Montane Humid Evergreen Broad-leaved Forest (H), Tsuga Forest (Ts). The results indicated that NH4+-N content decreased for all the forest types soil after four months training, the order of decrease proportion is monsoon evergreen broad-leaved forest (84.1%)> montane rain forest (69.3%)> the mid-montane humid evergreen broad-leaved forest (34.7%)> dry-hot vally (8.7%)> tsuga forest (7.3%). And NO3--N content increased for the soils, the increasing multiples is tsuga forest (39.0 times)> dry-hot vally (18.8 times)> the mid-montane humid evergreen broad-leaved forest (4.7 times)> monsoon evergreen broadleaf forest (4.0 times) > montane rainforest (2.8 times). We conclude that NH4+-N is the main form of inorganic nitrogen in forest soil, which is the main reason of changing the soil nitrogen mineralization and mineralization rate.

Responses of Soil Acid Phosphomonoesterase Activity to Simulated Nitrogen Deposition in Three Forests of Subtropical China

Abstract. Phosphorus (P) is often a limiting nutrient for plant growth in tropical and subtropical forests. Global climate change has led to alterations in precipitation in the recent years, which inevitably influences P cycling. Soil acid phosphatase plays a vital role in controlling P mineralization, and its activity reflects the capacity of organic P mineralization potential in soils. In order to study the effects of precipitation on soil acid phosphatase activity, an experiment with precipitation treatments (no precipitation, natural precipitation and doubled precipitation) in three successional forests in southern China was carried out. The three forests include Masson pine forest (MPF), coniferous and broad-leaved mixed forest (MF) and monsoon evergreen broad-leaved forest (MEBF). Results showed that driven by seasonality of precipitation, changes in soil acid phosphatase activities coincided with the seasonal climate pattern, with significantly higher values in the wet season than in the dry season. Soil acid phosphatase activities were closely linked to forest successional stages, with enhanced values in the later stages of forest succession. In the dry season, soil acid phosphatase activities in the three forests showed a rising trend with increasing precipitation treatments. In the wet season, soil acid phosphatase activity was depressed by no precipitation treatment in the three forests. However, doubled precipitation treatment exerted a significantly negative effect on it only in MEBF. These results indicate that the potential transformation rate of organic P might be more dependent on water in the dry season than in the wet season. A decrease in organic P turnover would occur in the three forests if there was a drought in a whole year in the future. More rainfall in the wet season would also be adverse to organic P turnover in MEBF due to its high soil moisture.

Soil respiration associated with forest succession in subtropical forests in Dinghushan Biosphere Reserve

Bird diversity and its community structure were important indicators for the long-term monitoring of biodiversity in ecosystems. The typical forest vegetation types were well preserved in Dinghushan National Nature Reserve, including monsoon evergreen broad-leaved forest, mixed Pinus massoniana/broad-leaved forest and Pinus massoniana coniferous forest. The monsoon evergreen broad-leaved forest has been conservation history of more than 400 years. The dataset was systematized sorting and statistics on the long-term monitoring of breeding and wintering of bird communities from 2015 to 2018 in three typical forest vegetation types of Dinghushan Nature Reserve, that is, monsoon evergreen broad-leaved forest, mixed Pinus massoniana/broad-leaved forest and Pinus massoniana coniferous forest. Field surveys include bird species, number, time, distance, ground height, habitat type, activity substrate and behavior. The diversity index, evenness index, dominance index, similarity coefficient of bird community and occurrence frequency, individual number, average density of bird species in different survey periods were analyzed. A total of 89 species from 9 orders, 35 families were recorded in the dataset. The dataset provides important data support for further strengthening bird community studies and study of inter-species interaction between multiple groups of plants and animals and the protection and management of forest ecosystem in this region.

Simulating dynamics of managed monsoon evergreen broad-leaved forest in south China

PDF HTML阅读 XML下载 导出引用 引用提醒 模拟酸沉降对鼎湖山季风常绿阔叶林地表径流水化学特征的影响 DOI: 10.5846/stxb201209111279 作者: 作者单位: 中国科学院华南植物园 广州,中国科学院华南植物园 广州,中国科学院华南植物园 广州,中国科学院华南植物园 广州,中国科学院华南植物园 广州 作者简介: 通讯作者: 中图分类号: 基金项目: 国家重点基础研究发展计划(973)项目(2009CB421101);中国科学院战略性先导科技专项(XDA05050205))资助 Effect of simulated acid deposition on chemistry of surface runoff in monsoon evergreen broad-leaved forest in Dinghushan Author: Affiliation: South China Botanical Garden,,,,South China Botanical Garden 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:通过模拟酸沉降实验,研究了旱季期间(10-3月份)鼎湖山季风常绿阔叶林在4种不同pH模拟酸雨处理(对照、pH 4.0、pH 3.5、pH 3.0)下地表径流水化学输出特征。结果显示:(1)地表径流pH随酸处理强度增强呈"U"型变化模式,酸沉降对地表径流pH的影响不显著(P>0.05),表明模拟酸沉降尚未引起地表水的酸化。(2)地表径流中NO3-、SO42-浓度随酸处理强度增强略有增加;HCO3-浓度的变化模式与地表径流pH类似。酸根离子浓度与地表径流pH相关性分析表明,SO42-、HCO3-有助于提高地表水抗酸化能力而NO3-则有助于促进地表水酸化。(3)地表径流中盐基离子对酸沉降的响应不尽相同。pH 3.0处理显著提高地表径流中Ca2+、Na+浓度;Mg2+浓度具有随酸处理梯度增强而增加的趋势;K+受模拟酸度的影响小。表明强酸(pH 3.0)处理将导致土壤Na+ 、Ca2+、Mg2+盐基离子流失。(4)酸沉降具有诱发土壤可溶性有机碳(DOC)流失的倾向,增加地表水受有机污染的风险。 Abstract:The effects of simulated acid deposition on chemical properties of surface runoff were studied in a monsoon evergreen broad-leaved forest in Dinghushan Nature Reserve. Four gradients of simulated acid rain treatments with three replications were designed: control (natural lake water, pH 4.5±0.3), pH 4.0, pH 3.5 and pH 3.0. The surface runoff pH, nitric acid (NO3-), sulfuric acid (SO42-), bicarbonate (HCO3-), base cations (K+, Na+, Ca2+, Mg2+) and dissolved organic carbon (DOC) were detected from October 2011 to March 2012. The result showed that the surface runoff pH was not significantly different among treatments, which exhibited "U" patterns with increasing acid intensity. This suggested the pH was unlikely to decline in a short time. The NO3- and SO42- concentrations increased with acid increment, while HCO3- exhibited the same pattern as the surface runoff pH. According to the correlation between acid ions concentrations and the surface runoff pH, we found that SO42- and HCO3- promoted the ability of anti-acidification, while NO3- was adverse. Base cations responded differently to simulated acid treatments. Ca2+ and Na+ were very sensitive to acid deposition, and their concentrations at pH 3.0 treatment were significantly higher than at other acid treatments. Mg2+ concentration increased with the simulated acid intensity, however, there were not significant differences among different acid treatments. K+, however, was not sensitive to acid treatment. These results indicated that pH 3.0 treatment led to the loss of Na+, Ca2+ and Mg2+ from the soil. In addition, acid treatments tended to cause dissolved organic carbon (DOC) loss, increasing the risk of organic contamination in the surface runoff. 参考文献 相似文献 引证文献

Global changes such as increasing CO2, rising temperature, and land-use change are likely to drive shifts in litter inputs to forest floors, but the effects of such changes on litter decomposition remain largely unknown. We initiated a litter manipulation experiment to test the response of litter decomposition to litter removal/addition in three successional forests in southern China, namely masson pine forest (MPF), mixed coniferous and broadleaved forest (MF) and monsoon evergreen broadleaved forest (MEBF). Results showed that litter removal decreased litter decomposition rates by 27%, 10% and 8% and litter addition increased litter decomposition rates by 55%, 36% and 14% in MEBF, MF and MPF, respectively. The magnitudes of changes in litter decomposition were more significant in MEBF forest and less significant in MF, but not significant in MPF. Our results suggest that change in litter quantity can affect litter decomposition, and this impact may become stronger with forest succession in tropical forest ecosystem.

Evaluation of litterfall production is important for understanding nutrient cycling, forest growth, successional pathways, and inter- actions with environmental variables in forest ecosystems. Litterfall was intensively studied during the period of 1982-2001 in two subtropi- cal monsoon vegetation gradients in the Ding- hushan Biosphere Reserve, Guangdong Province, China. The two gradients include: (1) a successional gradient composed of pine forest (PF), mixed pine and broadleaved forest (MF) and monsoon evergreen broadleaved forest (BF), and (2) an altitudinal gradient composed of Baiyunci ravine rain forest (BRF), Qingyunci ravine rain forest (QRF), BF and mountainous evergreen broadleaved forest (MMF). Mean annual litterfall production was 356, 861 and 849 g m )2 for PF, MF and BF of the successional gradient, and 1016, 1061, 849 and 489 g m )2 for BRF, QRF, BF and MMF of the altitudinal gradient, respectively. As expected, mean annual litterfall of the pioneer forest PF was the lowest, but rapidly increased over the observation peri- od while those in other forests were relatively stable, confirming that forest litterfall production is closely related to successional stages and growth patterns. Leaf proportions of total lit- terfall in PF, MF, BF, BRF, QRF and MMF were 76.4%, 68.4%, 56.8%, 55.7%, 57.6% and 69.2%, respectively, which were consistent with the results from studies in other evergreen broadleaved forests. Our analysis on litterfall monthly distributions indicated that litterfall production was much higher during the period of April to September compared to other months for all studied forest types. Although there were significant impacts of some climate variables (maximum and effective temperatures) on lit- terfall production in some of the studied forests, the mechanisms of how climate factors (tem- perature and rainfall) interactively affect litter- fall await further study.

The monsoon evergreen broad-leaved forest (MEBF) in Dinghushan Biosphere Reserve, Guangdong Province, China, is considered climax forest vegetation in this climatic zone. Studies of its ecological processes, including the hydrology and inorganic solution chemistry, are important for understanding ecosystem function and to direct ecological restoration efforts in this region. In order to understand the response of nutrient cycles to environmental impacts and characterize the nutrient element cycles in this ecosystem, water samples of precipitation, throughfall, soil water at 30 and 80 cm depth and runoff in MEBF were collected weekly and the concentrations of eight inorganic elements measured from February 2001 to March 2002. The elements Al 3+ , Mn 2+ , Sr 2+ and Pb 2+ were measured by ICP (ps-1000AT, USA), Ca 2+ and Mg 2+ were analyzed using Atomic Absorption Spectrometer, and K + and Na + were determined using Flame Atomic Absorption Spectrometer. The results showed that the average concentration of Al 3+ in throughfall (0.393 3 mg·L -1 ) was slightly higher than that in precipitation (0.329 mg·L -1 ). The average concentrations of Al 3+ soil solutions were much higher than in precipitation and were about 4.7 times and 3.8 times higher in soil water collected at 30 cm depth and runoff, respectively. Al 3+ in runoff was derived primarily from soil leaching. Average concentrations of Mn 2+ , K + and Mg 2+ were lowest in precipitation and Sr 2+ and Ca 2+ concentrations were lowest in runoff. The average concentrations of Mn 2+ , Sr 2+ , K +, Mg 2+ and Ca 2+ in throughfall were much higher than in precipitation as a result of strong interactions with the tree canopy. The average concentration of Pb 2+ in precipitation was as high as 0.062 mg·L -1 , indicating some Pb 2+ pollution, and it was about 5 times and 10 times higher than that in throughfall and runoff, respectively. This indicated that the Pb 2+ in precipitation could be largely absorbed by the tree canopy and soil. The average concentration of Na + gradually increased as it passed through the ecosystem from precipitation (0.320 2 mg·L -1 ) to throughfall (0.524 7 mg·L -1 ), soil water at 30 cm (0.627 3 mg·L -1 ) and 80 cm (0.639 1 mg·L -1 ) depth and finally as runoff (0.629 6 mg·L -1 ). Coefficients of variation of the elemental concentrations in the different solutions ranged from 51.1% and 236.7%. The average concentrations of those elements in precipitation, throughfall, soil water at 30 and 80 cm depth were higher during the dry season than during wet season, but their concentrations in runoff during the dry season were lower than or close to that during the wet season. The element Mg had the highest element-couple correlation as compared to all other elements. The greatest element-couple correlations were found in throughfall. Correlations among other elements were highly variable. The results show that element nutrient cycles in this forest ecosystem are stable even though under environmental stress.