稻麦轮作生态系统中土壤湿度对N2O产生与排放的影响

应用生态学报 ›› 1996, Vol. 7 ›› Issue (3): 273-279.

稻麦轮作生态系统中土壤湿度对N₂O产生与排放的影响

郑循华¹, 王明星¹, 王跃思¹, 沈壬兴¹, 龚宴邦¹, 骆冬梅¹, 张文¹, 金继生², 李老土²

1. 中国科学院大气物理研究所, 北京100029;
2. 江苏省吴县市农业科学研究所, 苏州215128

收稿日期:1995-12-26 修回日期:1996-03-25 出版日期:1996-07-25 发布日期:1996-07-25
基金资助:
中国科学院大气物理研究所大气边界层物理与大气化学国家重点实验室基金资助项目

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

Zheng Xunhua¹, Wang Mingxing¹, Wang Yuesi¹

Institute of Atmospheric Physics, Academia Sinica, Beijing 100029

Received:1995-12-26 Revised:1996-03-25 Online:1996-07-25 Published:1996-07-25

摘要/Abstract

摘要： 通过对太湖地区稻麦轮作生态系统的N₂O排放及土壤湿度进行系统观测和开展一系列模拟实验,研究了降雨和土壤湿度对N₂O排放和产生过程的影响.结果表明,春季和秋季麦田N₂O排放与降雨量呈明显正相关,但水稻田和冬季麦田的N₂O排放不受降雨影响.稻麦轮作周期内的N₂O排放较强烈地受土壤湿度制约,土壤湿度为田间持水量的97～100%或84～86%WFPS(土壤体积含水量与总孔隙度的百分比)时,N₂O排放最强,低于此湿度范围时,N₂O排放通量与土壤湿度呈正相关,反之,则呈负相关.田间N₂O排放随土壤湿度的变化形式与模拟条件下培养土壤样品的N₂O产生率变化非常相似,但前者的最佳湿度范围比后者窄,而且偏小.

关键词: N₂O排放通量, 土壤湿度, 降雨量, N₂O产生率, 碳汇潜力, 理论基础, 退耕区域, 碳汇产业, 经济增长点

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

郑循华, 王明星, 王跃思, 沈壬兴, 龚宴邦, 骆冬梅, 张文, 金继生, 李老土. 稻麦轮作生态系统中土壤湿度对N₂O产生与排放的影响[J]. 应用生态学报, 1996, 7(3): 273-279.

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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稻麦轮作生态系统中土壤湿度对N₂O产生与排放的影响

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

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