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Driving Forces and Recovery Potential for the Declined Macrophytes in East Taihu Lake

Changtao YangXiaobing ShenJianbin WuXinyi ShiZhijie CuiYuwei TaoHaiming LuJianhua LiQinghui Huang

出版	SSRN, 2023
URL	http://books.google.com.hk/books?id=v1nzzwEACAAJ&hl=&source=gbs_api

註釋Macrophytes are of key importance for the structure and ecological services of shallow lakes and are sensitive to anthropogenic and natural perturbations. The ongoing eutrophication and hydrological regime change affect the macrophytes through changes in water transparency and water level, leading to drastic decrease in bottom light availability. Here, an integrated dataset (2005-2021) of multiple environmental factors was provided to demonstrate the driving forces and recovery potential for the declined macrophytes in East Taihu Lake using a critical indicator, ratio of the Secchi disk depth to water depth (SD/WD). Long-term distribution area in macrophytes showed a remarkable decrease from 136.1 ± 9.7 km2 (2005-2014) to 66.1 ± 6.5 km2 (2015-2021), macrophyte coverage in the lake and in the buffer zone decreased by 51.4% and 82.8%, respectively. The structural equation model and correlation analysis showed that distribution and coverage of macrophytes decreased with decreasing SD/WD ratio over time and was strongly determined by this factor. Moreover, extensive hydrological regime changes, causing sharp decrease in SD and increase of water level, is likely to be the driving force resulting in the decline of macrophytes in this lake. The proposed recovery potential model shows that the SD/WDs in recent years (2015-2021) were low, which can not ensure growth of submerged macrophytes and may hardly ensure growth of floating-leaved macrophytes, especially in the buffer zone. This approach developed in the present study provide a basis for the assessment of macrophyte recovery potential and the management of ecosystem in shallow lakes suffering from macrophyte loss.