川中丘陵地区冬水田甲烷排放特征研究
Characteristics of methane emission from winter flooded paddy field in the hilly area of central Sichuan Province
查看参考文献43篇
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文摘
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以川中丘陵地区典型冬水田为对象,设置了有水稻常规施肥(RF)、无水稻常规施肥(NP)、有水稻无氮肥(NN)3种处理,以静态暗箱-气相色谱法对甲烷(CH_4)排放进行了原位观测.结果表明,RF、NP和NN处理下CH_4排放通量分别为-0.0042~ 18.29、0.03~ 16.78和0.10~ 26.76 mg·m~(-2)·h~(-1),平均排放通量分别为10.22、4.25和14.15 mg·m~(-2)·h~(-1)(以每平方米每小时消耗/产生的C量(mg)计),水稻生长季是主要排放期,但休闲季CH_4排放量仍占全年CH_4总排放量的14%.没有水稻处理的CH_4排放量显著低于有水稻处理(p<0.01);而不施氮肥处理的CH_4排放量显著高于施肥处理(p<0.01).CH_4排放通量与5 cm深土壤温度呈显著正相关(p<0.01),随着温度的升高,甲烷排放量呈指数增加.CH_4排放通量与1~ 4 cm的稻田水深呈显著负相关(p<0.01),随着水深的增加,甲烷的排放呈指数迅速下降;而与4~ 8 cm的稻田水深无相关性,甲烷的排放也变化缓慢.由此表明,土壤温度和水深在很大程度上调控着CH_4的排放.此外,研究结果也显示将冬水田休闲期改为旱作可减少CH_4排放,对环境有利. |
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其他语种文摘
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This study was conducted to investigate CH_4 fluxes and associated environmental factors from a typical winter paddy field in the hilly region of central Sichuan Province. Three treatments were set,i.e. rice-flooded fallow rotation (RF),no plant (NP)and no nitrogen fertilizer (NN). CH_4 fluxes were analyzed by the static opaque chamber and gas chromatography techniques. The results showed that CH_4 fluxes from treatments of RF,NP and NN varied from -0.0042~ 18.29,0.03~ 16.78 and 0.10~ 26.76 mg·m~(-2)·h~(-1),with average fluxes of 10.22,4.25 and 14.15 mg·m~(-2)·h~(-1),respectively. The emissions of CH_4 mainly occurred in a paddy soil during rice-growing season. However,emissions of CH_4 in non-cropping season accounted for 14% of the total annual emissions,which could not be ignored. CH_4 emission after treatment of RF was significantly higher than that of NP but lower than that of NN (p<0.01). CH_4 emissions were positively correlated with soil temperature at the 5 cm depth (p<0.01)due to the exponential increase of the amount of methane emissions with temperature. CH_4 fluxes were negatively related to water depth in 1 ~ 4 cm of paddy fields (p<0.01),which suggested that soil temperature and water depth significantly influenced the fluxes of CH_4 . The study also indicated that wheat cultivation in paddy soils during non-cropping season might be an effective way to reduce the release of CH_4,which facilitated decreasing the emission of greenhouse gasses. |
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来源
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环境科学学报
,2017,37(6):2281-2287 【核心库】
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DOI
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10.13671/j.hjkxxb.2016.0408
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关键词
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冬水田
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甲烷
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影响因子
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相关性
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地址
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1.
华中农业大学资源与环境学院, 武汉, 430070
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中国科学院成都山地灾害与环境研究所, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-2468 |
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学科
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环境污染及其防治 |
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基金
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国家973计划
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中央高校基本科研业务费专项基金
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文献收藏号
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CSCD:5998746
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