College of Land Science and Technology, China Agricultural University, Beijing, 100193, China.
Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK, 73019, USA.
Nat Commun. 2020 Jan 28;11(1):554. doi: 10.1038/s41467-019-14155-5.
Agriculture (e.g., rice paddies) has been considered one of the main emission sources responsible for the sudden rise of atmospheric methane concentration (XCH) since 2007, but remains debated. Here we use satellite-based rice paddy and XCH data to investigate the spatial-temporal relationships between rice paddy area, rice plant growth, and XCH in monsoon Asia, which accounts for ~87% of the global rice area. We find strong spatial consistencies between rice paddy area and XCH and seasonal consistencies between rice plant growth and XCH. Our results also show a decreasing trend in rice paddy area in monsoon Asia since 2007, which suggests that the change in rice paddy area could not be one of the major drivers for the renewed XCH growth, thus other sources and sinks should be further investigated. Our findings highlight the importance of satellite-based paddy rice datasets in understanding the spatial-temporal dynamics of XCH in monsoon Asia.
农业（例如稻田）自 2007 年以来一直被认为是导致大气甲烷浓度（XCH）突然上升的主要排放源之一，但这一观点仍存在争议。在这里，我们利用基于卫星的稻田和 XCH 数据，调查了季风亚洲稻田面积、水稻生长和 XCH 之间的时空关系，季风亚洲占全球水稻面积的~87%。我们发现，稻田面积与 XCH 之间存在很强的空间一致性，以及水稻生长与 XCH 之间的季节性一致性。我们的研究结果还表明，自 2007 年以来，季风亚洲的稻田面积呈下降趋势，这表明稻田面积的变化不可能是 XCH 增长的主要驱动因素之一，因此应该进一步调查其他来源和汇。我们的研究结果强调了基于卫星的稻田数据集在理解季风亚洲 XCH 时空动态方面的重要性。
