| 孙成胜,张仁陟,张军,蔡立群,周欢,董博.丰雨年旱作农业区不同耕作措施麦豆地N2O、CH4的排放[J].干旱地区农业研究,2015,33(3):196~204 |
| 丰雨年旱作农业区不同耕作措施麦豆地N2O、CH4的排放 |
| N2O and CH4 emissions of spring wheat-pea rotation fields under different tillage patterns in dryland farming in a wet year |
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| DOI：10.7606/j.issn.1000-7601.2015.03.32 |
| 中文关键词: N2O CH4 春小麦 豌豆 耕作措施 丰雨年 旱作农业 |
| 英文关键词:N2O CH4 spring wheat pea cultivation practices wet year dryland agriculture |
| 基金项目:国家自然科学基金项目(31160269)；国家科技支撑计划（2012BAD14B03） |
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| 中文摘要: |
| 采用静态箱-气相色谱法采集丰雨年旱作农业区不同耕作措施春小麦-豌豆地排放气体并计算通量，研究耕作措施、土壤温度和土壤含水量对春小麦-豌豆地N2O和CH4排放的影响，其中，耕作措施包括免耕秸秆覆盖（NTS）、免耕不覆盖（NT）和传统耕作+秸秆还田（TS）以及传统耕作不覆盖（T）四种。研究结果表明：不同措施麦豆地均为N2O的排放源，春小麦地通量波动范围0.018～0.146 mg·m-2·h-1，豌豆地通量波动范围0.024～0.210 mg·m-2·h-1，全生育期春小麦地N2O平均排放通量大小顺序：T>TS>NT>NTS,而豌豆地大小顺序：T>NTS>NT>TS；不同耕作措施麦豆地均表现为CH4的吸收汇，春小麦地吸收通量的波动范围0.051～0.212 mg·m-2·h-1，豌豆地的波动范围0.057～0.193 mg·m-2·h-1，全生育期春小麦地CH4平均吸收通量大小顺序：NTS>NT>TS>T,豌豆地大小顺序：NTS>TS>NT>T；不同耕作措施对N2O和CH4全生育期通量有明显的影响，TS、NT和NTS三种耕作措施较T措施而言，有效地减少了N2O的排放且增加CH4的吸收；丰雨年，土壤温度和土壤含水量对旱作农业区N2O和CH4排放综合影响权重有所降低。 |
| 英文摘要: |
| This study aims to illustrate the effect of tillage patters, soil temperature and soil moisture content on N2O and CH4 emissions of spring wheat-pea rotation fields in a wet year. Gases (N2O and CH4) emission were determined under four tillage patterns including no-tillage with straw mulching (NTS), no-tillage without straw mulching (NT), conventional tillage with straw mulching(TS) and conventional tillage without straw mulching (T) by static chamber-gas chromatographic techniques. The results showed that both wheat and pea fields were emission sources of N2O regardless of the patters. Emission flux of spring wheat field ranged from 0.018 mg·m-2·h-1 to 0.146 mg·m-2·h-1, while that from pea field was from 0.024 mg·m-2·h-1 to 0.210 mg·m-2·h-1. N2O average emission flux of spring wheat field was in the order of T>NT>NTS>TS, while that from pea field T>NTS>NT>TS. Both wheat and pea fields were sinks of CH4 irrespective of tillage patters. The absorbed flux of spring wheat and pea field were from 0.051 mg·m-2·h-1 to 0.212 mg·m-2·h-1 and 0.057 mg·m-2·h-1 to 0.193 mg·m-2·h-1, respectively. Average CH4 absorption fluxes of spring wheat and pea field was in the order of NTS>NT>TS>T and NTS>TS>NT>T, respectively. Significant effects on fluxes of N2O and CH4 existed across the tillage patterns. Compared with T, TS, NT and NTS reduced emissions of N2O effectively and increased the absorption of CH4. The comprehensive influence of soil temperature and soil moisture content on N2O and CH4 emission in dryland farming in a wet year was lower than that in a normal year. |
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