Methane efflux from rice-based cropping systems under humid tropical conditions of eastern India
Methane efflux from rice-based cropping systems under humid tropical conditions of eastern India
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DOI：
10.1016/s0167-8809(99)00144-9
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发表时间：
2000-06-01
影响因子：
6.6
通讯作者：
Sethunathan, N
中科院分区：
文献类型：
--
作者：
Adhya, TK;Mishra, SR;Sethunathan, N
热带稻田被认为是大气甲烷（CH 4）的主要人为源之一。在一个日历年的干湿季节进行的田间研究中，对高地（油料和豆类）作物在旱季和随后的低地水稻（Oryza sativa L.）在淹水条件下，将湿季作物与两季稻-稻轮作进行了比较。旱稻后低地稻的CH 4累积通量（12.52-13.09 g CH 4 m（2））低于稻-稻轮作的CH 4累积通量（39.96 g CH 4 m（2））。特别有趣的是，在雨季的低地水稻之前，在旱季的高地作物的季节性平均甲烷排放量低相比，低地水稻在雨季之前，旱季淹水水稻。结果表明，种植适宜的高地作物，减少稻田淹水时间，可以降低热带水稻生态系统CH 4的累积排放量。(C)2000 Elsevier Science B. V.保留所有权利。
Tropical rice paddy is considered to be one of the major anthropogenic source of atmospheric methane (CH4). In a field study spread over the dry and wet seasons of a calendar year, the CH4 emission from upland (oilseed and pulse) crops in the dry season and a succeeding lowland rice (Oryza sativa L.) crop in the wet season was compared with rice-rice rotation in both seasons under flooded conditions. Cumulative CH4 flux from the upland crop followed by lowland rice crop was low (12.52-13.09 g CH4 m(2)) compared to that of the rice-rice rotation (39.96g CH4 m(2)). What was particularly interesting is that the seasonal mean CHI emission from the lowland rice in wet season preceded by an upland crop in dry season was low when compared to that of lowland rice in wet season preceding a dry season flooded rice. Results indicate that the cumulative CH4 emission from tropical rice ecosystem can be lowered by growing suitable upland crops to reduce the period that rice paddies are submerged during an annual cropping cycle. (C) 2000 Elsevier Science B.V. All rights reserved.