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Carbon uptake of the sugarcane agroecosystem is profoundly impacted by climate variations due to seasonality and topography

文献类型： 外文期刊

作者： Ma, Jun 1 ; Xu, JingXian 1 ; He, Panxing 1 ; Chen, Bangqian 3 ;

作者机构： 1.Fudan Univ, Sch Life Sci, Natl Observat & Res Stn Wetland Ecosyst Yangtze Es, Minist Educ,Key Lab Biodivers Sci & Ecol Engn, 2005 Songhu Rd, Shanghai 200438, Peoples R China

2.PIESAT Informat Technol Co Ltd, Beijing, Peoples R China

3.Chinese Acad Trop Agr Sci CATAS, Rubber Res Inst RRI, Beijing, Peoples R China

4.Hainan Danzhou Agroecosyst Natl Observ & Res Stn, Danzhou, Hainan, Peoples R China

5.State Key Lab Incubat Base Cultivat & Physiol Trop, Haikou 571101, Peoples R China

关键词： Sugarcane; Agroecosystem; Extreme climates; Phenological periods; Remote sensing

期刊名称：FIELD CROPS RESEARCH （ 影响因子：6.145； 五年影响因子：7.234 ）

ISSN： 0378-4290

年卷期： 2022 年 289 卷

页码：

收录情况： SCI

摘要： Sugarcane is an economically important crop whose growth and carbon uptake play vital roles in the carbon cycle, food security, and global trade development. However, the response of the carbon uptake of sugarcane to climate variations and the influencing factors are still unclear. In this study, seven sugarcane plantation distri-bution maps during 2000 and 2018 in Guangxi, China, were generated using time series Landsat and Sentinel-2 imagery, and these maps were used to produce stable sugarcane sites by identifying pixels without land cover transformation. Time series gross primary production (GPP) and climate datasets were used to analyze the response of annual GPP to temperature, precipitation, and their interacting effects under different landforms (rugged ground and flat ground) and growing periods. The results showed a significantly positive correlation between annual GPP change and temperature variations. Extreme precipitation, including extreme drought and extreme wetness, caused the annual GPP to decrease sharply, except for extreme wetness in the early growing period. The decrease in annual GPP mainly appeared when extreme drought and hot conditions or extreme wet and cold conditions coexisted, ranging from-20.37% to-0.23%, while the increase in annual GPP especially appeared when non-extreme precipitation and high temperature co-occurred, ranging from 0.02% to 8.44%. In addition, the responses of sugarcane annual GPP change to extreme temperature and precipitation were significantly different between rugged and flat ground. Overall, this study indicated that spatiotemporal het-erogeneities existed in the response of sugarcane carbon uptake to climate variations. In the future, effective measures should be adopted in sugarcane management and cultivation to reduce the negative effects of climate change on crop production.

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