农业生态系统和大气间的温室效应气体交换

农业生态系统是温室效应气体的一个重要的源和汇.主要的温室效应气体直接或者间接的与这个系统有关,自然植被的破坏和土地的农业利用,包括稻田种植面积的扩大和氮肥的大量使用既增加了二氧化碳、甲烷和一氧化二氮等主要温室效应气体的释放,又减少了土壤对甲烷的吸收.本文还讨论了土壤过程与温室效应气体释放和吸收的关系以及影响上述过程的因素.

Exchange of Greenhouse Gasses between Agroecosystem and Atomosphere

Flux of greenhouse gasses in agricultural ecosystem contributes significantly to global greenhouse effect. Major greenhouse gasses, CH4, CO2 and N2O, are directly or indirectly related to farming system and agricultural practice. Destruction of na-application of excess nitrogen fertilizer nor only in-tural vegetation, increase in rice plantation and crease the emission of CH4, CO2 and N2O from the system, but reduce the soil uptake of CH4 as well. The processes in soil, involving production of greenhouse gasses, were also discussed.