土壤湿度对农田氧化亚氮排放的影响——以东南地区水稻农业生态系统为例

Chemosphere - Global Change Science Pub Date : 2000-04-01 DOI:10.1016/S1465-9972(99)00056-2

Xunhua Zheng , Mingxing Wang , Yuesi Wang , Renxing Shen , Ji Gou , Jing Li , Jisheng Jin , Laotu Li

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引用次数: 238

摘要

通过对中国东南稻麦轮作生态系统土壤水分和氮氧化物(N2O)排放的原位测量和室内模拟试验，研究了土壤水分对N2O排放的影响。通过对试验数据的详细分析，可以得出以下结论:(a)决定中国东南稻作轮作生态系统N2O排放季节变化格局的不是氮肥，而是土壤湿度和温度。(b)土壤湿度是调节农田N2O排放最敏感的因子。(c)水稻农业生态系统N2O的爆炸性排放发生在土壤含水量在(110±5)%土壤持水量或田容量(SWHC)或(99±9)%充水孔隙空间(WFPS)范围内。当稻田土壤湿度低于SWHC的105%时，N2O排放量随土壤湿度呈指数增长。超过115% SWHC时，N2O排放量随土壤湿度的变化呈负相关。(d)田间土壤N2O排放率对土壤湿度变化的响应可以用一般经验方程很好地描述。对于x≤C0%的SWHC, F=Ae−B(x−C0)2+DeEx。对于x大于或等于C0%的SWHC, F=Ae−B(x−C0)2+eGx−H。描述土壤湿度与培养土壤N2O排放率关系的方程与田间观测数据的拟合方程不同。造成这种差异的原因仍不确定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Impacts of soil moisture on nitrous oxide emission from croplands: a case study on the rice-based agro-ecosystem in Southeast China

Based on the in situ measurement of soil moisture and nitrous oxide (N₂O) emission from a rice–wheat rotation ecosystem of southeast China and on the simulated experiments in laboratory, the impact of soil moisture on N₂O emission is investigated. By analyzing the experimental data in detail, some results could be outlined as follows: (a) It is soil moisture and temperature instead of N fertilization that determines the seasonal variation pattern of N₂O emission from the rice-based crop rotation ecosystem of southeast China. (b) Soil moisture is the most sensitive factor to regulate N₂O emission from croplands. (c) Explosive emission of N₂O from the rice-based agro-ecosystem was found to happen at the soil moisture within (110±5)% soil water holding capacity or field capacity (SWHC) or (99±9)% water-filled pore space (WFPS). When soil moisture of the rice–wheat fields is less than 105% SWHC, the N₂O emission was observed to increase exponentially vs. soil moisture. In contrast, N₂O emission was found to decrease reciprocally vs. soil moisture more than 115% SWHC. (d) The response of the N₂O emission rate from soils in fields to variations of soil moisture may be well described with a general empirical equation. For x⩽C₀% SWHC, $F=A e^{−B(x−C_{0})^{2}} +D e^{Ex}$ . For x⩾C₀% SWHC, $F=A e^{−B(x−C_{0})^{2}} + e^{G} x^{−H}$ . The equation to describe the relationship between soil moisture and N₂O emission rates from incubated soil is different from that for fitting data observed in fields. Reasons for the difference still remains uncertain.

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Chemosphere - Global Change Science

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