Vegetation Cover Dynamics and Resilience to Climatic and Hydrological Disturbances in Seasonal Floodplain: The Effects of Hydrological Connectivity.
Vegetation Cover Dynamics and Resilience to Climatic and Hydrological Disturbances in Seasonal Floodplain: The Effects of Hydrological Connectivity.
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季节性洪泛区植被覆盖动态和对气候和水文扰动的恢复力：水文连通性的影响。
DOI：
10.3389/fpls.2017.02196
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发表时间：
2017
影响因子：
5.6
通讯作者：
Wen L
中科院分区：
文献类型：
--
作者：
Shi L;Wang Y;Jia Y;Lu C;Lei G;Wen L
洪泛区湿地是维持生物多样性的宝贵生态系统，但易受水文变化和极端气候的影响。长江中游河漫滩湿地是生物多样性的热点地区，对越冬迁徙水鸟尤为重要。近年来，长江中游冬季极端低水位事件频繁发生。湿地是长江滩区最重要的生态组成部分之一，是长江流域越冬候鸟的重要栖息地，水文干旱严重影响了湿地的发育和分布。为了有效地管理潮湿的草地，关键是要找出导致草地退化的原因。在这项研究中，我们评估了2000 - 2016年期间水文连通性对鄱阳湖湿地草甸生态稳定性的影响。我们使用的时间序列的MODIS EVI（增强植被指数）作为生产力的代理来推断湿地草地的生态稳定性方面的阻力和弹性。研究结果表明：（1）自由连通湖泊中的湿草甸具有显著较高的恢复力;（2）控制湖泊中的湿草甸对水位异常具有较高的抵抗力;（3）两种类型湖泊对降雨异常的抵抗力没有差异;（4）自由连通湖泊中的湿草甸可能接近临界点，政权转移可能迫在眉睫。我们的研究结果表明，适应性管理在区域-（即，三峡大坝的运行）和场地规模（例如，为了维护该系统的长期生态稳定，需要采取各种措施（包括规范采砂），这对地方、区域和全球生物多样性的保护具有重大影响。
Floodplain wetlands are valuable ecosystems for maintaining biodiversity, but are vulnerable to hydrological modification and climatic extremes. The floodplain wetlands in the middle Yangtze region are biodiversity hotspots, particularly important for wintering migratory waterbirds. In recent years, extremely low winter water level events frequently occurred in the middle Yangtze River. The hydrological droughts greatly impacted the development and distribution of the wet meadows, one of the most important ecological components in the floodplains, which is vital for the survival of many migratory waterbirds wintering in the Yangtze region. To effectively manage the wet meadows, it is critical to pinpoint the drivers for their deterioration. In this study, we assessed the effects of hydrological connectivity on the ecological stability of wet meadow in Poyang Lake for the period of 2000 to 2016. We used the time series of MODIS EVI (Enhanced Vegetation Index) as a proxy for productivity to infer the ecological stability of wet meadows in terms of resistance and resilience. Our results showed that (1) the wet meadows developed in freely connected lakes had significantly higher resilience; (2) wet meadows colonizing controlled lakes had higher resistance to water level anomalies; (3) there was no difference in the resistance to rainfall anomaly between the two types of lakes; (4) the wet meadow in freely connected lakes might approach a tipping point and a regime shift might be imminent. Our findings suggest that adaptive management at regional- (i.e., operation of Three Gorges Dam) and site-scale (e.g., regulating sand mining) are needed to safeguard the long-term ecological stability of the system, which in term has strong implications for local, regional and global biodiversity conservation.
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DOI：
10.1073/pnas.0802430105
发表时间：
2008-09-23
影响因子：
11.1
作者：
Dakos, Vasilis;Scheffer, Marten;Held, Hermann
通讯作者：
Held, Hermann
影响因子：
5.7
作者：
Bino, Gilad;Sisson, Scott A.;Bowen, Sharon
通讯作者：
Bowen, Sharon
影响因子：
6.3
作者：
Cochrane, T. A.;Arias, M. E.;Piman, T.
通讯作者：
Piman, T.
影响因子：
64.8
作者：
Costanza, R;dArge, R;vandenBelt, M
通讯作者：
vandenBelt, M
影响因子：
3.4
作者：
Caldeira, MC;Hector, A;Pereira, JS
通讯作者：
Pereira, JS