Effects of water-table depth and soil moisture on plant biomass, diversity, and distribution at a seasonally flooded wetland of Poyang Lake, China
Effects of water-table depth and soil moisture on plant biomass, diversity, and distribution at a seasonally flooded wetland of Poyang Lake, China
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鄱阳湖季节性洪水湿地地下水位深度和土壤湿度对植物生物量、多样性和分布的影响
DOI：
10.1007/s11769-015-0774-x
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发表时间：
2015-07
影响因子：
3.4
通讯作者：
Wang Xiaolong
中科院分区：
文献类型：
--
作者：
Xu Xiuli;Zhang Qi;Tan Zhiqiang;Li Yunliang;Wang Xiaolong
水文情势已被广泛认为是决定季节性洪泛湿地植被分布的主要力量之一。鄱阳湖是我国最大的淡水湖，近十年来水文条件发生了巨大变化，对湿地植被产生了重大影响。为探讨水文与植被分布的关系，对吴城国家级自然保护区季节性水淹湿地断面的地下水位、土壤含水量、物种组成、多样性和生物量进行了测定。本文研究了从高地到湖岸随海拔降低而呈带状分布的三个植物群落：茵陈蒿群落、芦苇群落和灰苔草群落。采用典型对应分析、Spearmen相关分析和Logistic回归分析了植被特征与地下水位、土壤水分等水文变量之间的关系。结果表明，沿湿地样带沿着存在明显的水文梯度。地下水位表现出季节性变化，并始终是最深的。毛管群落（范围为-0.5 ~+10.3m），中等偏上。australiscommunity（-2.6 m ~+7.8 m），C.灰化上升群落（-4.5 ~+6.1 m）。土壤含水量最低，变化最大。毛管植物群落，P. australiscommunity，C. Cinerascens社区CCA排序结果表明，地下水位和土壤含水量与群落分布密切相关，可解释81.7%的植被变异。物种多样性指数与土壤水分呈显著正相关，与水分变异呈显著负相关，而地上和地下生物量与水分呈正相关。地上、地下生物量沿生长季平均地下水位梯度呈沿着高斯分布，物种多样性指数呈双峰分布。地下生物量和地上生物量的最佳地下水位深度分别为0.8 m和0.5 m，物种丰富度和Shannon-Wiener指数的最佳地下水位深度分别为2.2 m和2.4 m。这项工作的成果提高了水文和植被之间的关系的理解。
Hydrological regime has been widely recognized as one of the major forces determining vegetation distribution in seasonally flooded wetland. Poyang Lake, the largest freshwater lake in China, has been encountering dramatic changes in hydrological conditions in last decade, which greatly influenced the wetland vegetations. To explore the relationships between hydrology and vegetation distribution, water-table depth, soil moisture, species composition, diversity and biomass were measured at a seasonally flooded wetland section at Wucheng National Nature Reserve. Three plant communities,Artemisia capillaris, Phragmites australisandCarex cinerascenscommunities, were examined which are zonally distributed from upland to lakeshore with decreasing elevation. Canonical correspondence analysis (CCA), spearmen correlation and logistic regression were adopted to analyze the relationships between vegetation characteristics and hydrological variables of water-table depth and soil moisture. Results show that significant hydrological gradient exist along the wetland transect. Water-table demonstrates a seasonal variation and is consistently deepest inA. capillariscommunity (ranging from–0.5 m above ground to +10.3 m below ground), intermediate inP. australiscommunity (–2.6 m to +7.8 m) and shallowest inC. cinerascenscommunity (–4.5 m to +6.1 m). Soil moisture is lowest and most variable inA. capillariscommunity, highest and least variable inP. australiscommunity, and intermediate and moderate variable inC. cinerascenscommunity. The CCA ordination indicated that variables of water-table depth and soil moisture are strongly related to community distribution, which explained 81.7% of the vegetation variations. Species diversity indices are significantly positively correlated with soil moisture and negatively correlated with moisture variability, while above- and belowground biomass are positively correlated with moisture. Above- and belowground biomass present Gaussian models along the gradient of average water-table depth in growing season, while species diversity indices show bimodal patterns. The optimal average water-table depths for above- and belowground biomass are 0.8 m and 0.5 m, respectively, and are 2.2 m and 2.4 m for species richness and Shannon-Wiener indices, respectively. Outcomes of this work improved the understandings of the relationship between hydrology and vegetation.
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影响因子：
2.2
作者：
Xu-chun Ye;Qi Zhang;Ligang Bai;Q. Hu
通讯作者：
Xu-chun Ye;Qi Zhang;Ligang Bai;Q. Hu
DOI：
10.18307/2012.0505
发表时间：
2012
期刊：
Journal of Lake Sciences
影响因子：
--
作者：
Mingkai Qian
通讯作者：
Mingkai Qian
影响因子：
2.9
作者：
HUSTON, M
通讯作者：
HUSTON, M
影响因子：
--
作者：
You Hai-lin
通讯作者：
You Hai-lin
影响因子：
2
作者：
C. Hammersmark;M. Rains;A. C. Wickland;J. Mount
通讯作者：
C. Hammersmark;M. Rains;A. C. Wickland;J. Mount