Climatic versus Anthropogenic Controls of Decadal Trends (1983-2017) in Algal Blooms in Lakes and Reservoirs across China.

Climatic versus Anthropogenic Controls of Decadal Trends (1983-2017) in Algal Blooms in Lakes and Reservoirs across China.
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中国湖泊水库藻华十年趋势(1983-2017)的气候与人为控制。

DOI:
10.1021/acs.est.0c06480
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发表时间:
2021-02
影响因子:
11.4
通讯作者:
Lili Lyu
Lili Lyu
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Kaishan Song;Chong Fang;Pierre-Andre Jacinthe;Zhidan Wen;Ge Liu;Xiaofeng Xu;Yingxin Shang;Lili Lyu

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湖库藻类水华的大量发生对湖泊水质和水生生物群落的生态健康构成威胁。随着全球气候变化,令人关切的是,内陆和内陆地区大气环流的频率和地理范围可能会增加。中国在过去几十年中经历了快速的经济增长和重大的土地利用变化,因此为这种分析提供了极好的背景。利用约289,600张Landsat图像研究了中国(1983-2017)L& R(>1 km 2)中ABs的时空分布。结果表明,中国陆地和陆地上AB事件的归一化面积(0.26)、频率(2.28)、持续时间(6.14)和早期爆发(-3.48)之和的时间斜率发生了显著变化。具体而言,受AB影响的水体纵向扩展,AB观测的时间范围从2000年代开始扩大。斯皮尔曼相关分析和随机森林回归分析进一步表明,在气候因子中,风速和温度对AB扩展的贡献最大。总的来说,人为因素已经超越了气候因素对中国L& R中ABs时间演变的影响,因此可以为这些资源的管理提供政策决策。
The proliferation of algal blooms (ABs) in lakes and reservoirs (L&Rs) poses a threat to water quality and the ecological health of aquatic communities. With global climate change, there is a concern that the frequency and geographical expansion of ABs in L&Rs could increase. China has experienced rapid economic growth and major land-use changes over the last several decades and therefore provides an excellent context for such an analysis. About 289,600 Landsat images were used to examine the spatiotemporal distribution of ABs in L&Rs (>1 km2) across China (1983-2017). Results showed significant changes in the temporal slope of the sum of normalized area (0.26), frequency (2.28), duration (6.14), and early outbreak (-3.48) of AB events in L&Rs across China. Specifically, AB-impacted water bodies expanded longitudinally, and the time range of AB observation has expanded starting in the 2000s. Spearman correlation and random forest regression analyses further indicated that, among climatic factors, wind speed and temperature contributed the most to AB expansion. Overall, anthropogenic forces have overridden the imprints of climatic factors on the temporal evolution of ABs in China's L&Rs and therefore could inform policy decisions for the management of these resources.
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