Tidal groundwater flow and its ecological effects in a brackish marsh at the mouth of a large sub-tropical river
Tidal groundwater flow and its ecological effects in a brackish marsh at the mouth of a large sub-tropical river
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亚热带大河口咸水沼泽潮汐地下水流及其生态效应
DOI：
10.1016/j.jhydrol.2017.10.025
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发表时间：
2017-12
影响因子：
6.4
通讯作者：
Xiaowei Jiang
中科院分区：
文献类型：
--
作者：
Kai Xiao;Hailong Li;Alicia M. Wilson;Yuqiang Xia;Li Wan;Chunmiao Zheng;Qian Ma;Chaoyue Wang;Xusheng Wang;Xiaowei Jiang
土壤饱和度被认为是潮间带湿地植物地带性的重要控制因素，但在实际沼泽系统中将土壤饱和度与植物地带性联系起来的定量研究很少。为了探讨长江口微咸湿地地下水流动与生态区带之间的潜在联系，我们进行了实地和模拟相结合的研究。潮间带沼泽样带包含两个植物带（芦苇和互花米草）和一个靠近河口的无植被泥滩。通过数值模拟，量化土壤饱和指数（SSI，饱和时间占整个观测周期的比例），用于分析植物地带性。模型考虑了多种因素，包括含水层分层、各向异性、蒸散发、地表地形（特别是坡折）、渗流面形成和潮汐荷载。模拟结果表明，在根际深度（0.0 ~ 0.3 m）上，两个植物区交界处的平均SSI突然增加了11.4%，在植被区向江边界处又增加了10.5%。SSI的显著增加不是由坡面溃决引起的，而是由渗流面引起的。考虑到芦苇和互花米草在耐缺氧条件方面的已知差异，SSI量化的地下饱和/不饱和条件最有可能是观察到的植物地带性的原因。
Soil saturation is thought to be an important control on plant zonation in intertidal wetlands, but quantitative studies linking saturation and plant zonation in real marsh systems are few. We conducted a combined field and modeling study to examine the potential links between groundwater flow and ecological zonation in a brackish marsh in the Yangtze River estuary. The intertidal marsh transect contained two plant zones (Phragmites australisandSpartina alterniflora) and an unvegetated mud flat adjacent to the estuary. Numerical simulations were conducted to quantify soil saturation index (SSI, ratio of saturated time to the whole observation period) for analyzing plant zonation. Models considered multiple factors, including aquifer stratification, anisotropy, evapotranspiration, surface topography (particularly slope breaks), seepage face formation and tidal loading. Simulations revealed that the average SSI over the rhizosphere depth from 0.0 m to 0.3 m increased abruptly by 11.4% at the interface of the two plant zones, and by another 10.5% at the riverward boundary of the vegetated zone. The significant increase of SSI was not caused by slope breaks but seepage face was responsible for the riverward increase of SSI. Given known differences betweenPhragmites australisandSpartina alterniflorain their tolerances to anoxic conditions, the subsurface saturated/unsaturated conditions quantified by SSI are most probably responsible for the observed plant zonation.
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DOI：
10.1007/s002540000172
发表时间：
2000-11
期刊：
Environmental Geology
影响因子：
--
作者：
Xunhong Chen
通讯作者：
Xunhong Chen
影响因子：
4.8
作者：
Alicia M. Wilson;T. Evans;W. Moore;C. A. Schutte;S. Joye;Andrea H Hughes;Joseph L. Anderson
通讯作者：
Alicia M. Wilson;T. Evans;W. Moore;C. A. Schutte;S. Joye;Andrea H Hughes;Joseph L. Anderson
影响因子：
6.4
作者：
C. Hughes;P. Binning;G. Willgoose
通讯作者：
C. Hughes;P. Binning;G. Willgoose
1974—2010年长江三角洲岸线运动时空变化
影响因子：
3
作者：
Chu, Z.X.;Yang, X.;Feng, X.;Fan, D.;Li, Y.;Shen, X.;Miao, A.
通讯作者：
Miao, A.
影响因子：
6.3
作者：
Yuqiang Xia;Hailong Li
通讯作者：
Yuqiang Xia;Hailong Li