| 论文标题： | |
|---|---|
| 作者： | |
| 出版刊物： | |
| 出版日期： | |
| 出版年份： | |
| 卷/期： | |
| DOI： | |
| 论文摘要： | Managing water level from an ecological perspective has become an urgent issue in recent years in efforts to conserve and restore lake ecosystems. Here we provide a novel methodology to assess water level requirements (WLRs) of shallow lakes, combining geomorphological, hydrological and biological characters. The approach involves five calculation steps, and was applied in a shallow lake of the Yangtze River basin. Whole-lake aquatic vegetation coverage was regarded as a surrogate of ecosystem health. Water level and light availability, two major factors limiting the distribution of aquatic plants, were considered and quantitative relationships were established between water level during germination and vegetation coverage. The germination water level was then treated as a benchmark in determining WLRs of life history stages of aquatic plants. In the model, water levels during the early life history stages were held low and constant to enable germination, and the overall regime was matched with historical natural conditions. The case study showed that vegetation coverage decreased with increasing water level during germination, and a higher Secchi depth (greater water clarity) was associated with a larger coverage. The observed vs. estimated regression line was not significantly different from unity, indicating a high predictive power of the model. The methodology established a quantitative linkage between hydrological variables and ecosystem health. It could be widely used in WLRs assessments in Yangtze shallow lakes as well as other similar waterbodies, providing a useful tool to manage lake ecosystems for conservation and restoration. (C) 2017 Elsevier B.V. All rights reserved. |
以下内容与「星空体育彩票成为巴塞罗那指定合作伙伴」同属公开资讯，可按栏目接着查阅相关条目。
本站按公开材料组织页面。需要原文时请核对应栏目发布页。
若从搜索引擎进入，可先确认当前栏目名称，再按需打开相关阅读。
