Impact of soil humidity on N2O production and emission from a rice-wheat rotation ecosystem

Abstract

Abstract: Based on the in-situ measurement of soil humidity and N₂O emission from a rice-wheat rotation ecosystem and on the simulated experiment in laboratory,the impact of precipitation and soil humidity on N₂O production and emission is studied.The results show that the N₂O emission from wheat field is positively correlated with precipitation in spring and autumn but not in winter,and that from rice field is not influenced by precipitation.Within a cycle of rice-wheat rotation, N₂O emission is intensively affected by soil humidity.97～100% of soil water holding capacity (i.e.,84～86% of WFPS) leads to a maximum N₂O emission.When the soil humidity is lower than this range,there is a positive correlation between N₂O emission flux and soil humidity, and on the contrary,there is a negative one.The variation pattern of N₂O emission with soil humidity is similar both under field and under simulated condition, although under the former one,the optimum humidity range for N₂O emission is lower.

Key words: N₂O emission flux, Soil humidity, Precipitation, N₂O production rate, carbon sink potential, economic growth point, carbon sink industry, de-farming region, theoretical basis

Zheng Xunhua, Wang Mingxing, Wang Yuesi. Impact of soil humidity on N₂O production and emission from a rice-wheat rotation ecosystem[J]. Chinese Journal of Applied Ecology, 1996, 7(3): 273-279.

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Impact of soil humidity on N₂O production and emission from a rice-wheat rotation ecosystem

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