不同耕作措施对华北地区麦田CH4吸收通量的影响
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国家“十一五”科技支撑资助项目(2006BAD15B07,2007BAD89B09-9);2008年公益性行业(农业)科研专项经费资助(200803028);山东省资源节约型社会专项资助项目(2006JY06)


Effect of CH4 uptake flux under different tillage systems in wheat field in the North China Plain
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    摘要:

    华北地区作为我国重要的粮食产区,其农田土壤CH4的吸收与排放对我国准确合理的估算农业温室气体的排放量、制定合理的农业减排和适应措施具有重要意义。研究利用静态箱-气相色谱法研究了华北地区麦田5种不同耕作模式在不同生育时期土壤CH4通量的动态变化和日变化,试验结果表明:5种不同耕作模式在不同生育时期土壤CH4通量具有明显的动态变化。不同的耕作处理都表现为CH4的净吸收汇。整个生育期,常规耕作无秸秆还田处理≈常规耕作秸秆还田处理>耙耕≈旋耕>深松耕>免耕。CH4吸收通量具有明显的日变化,吸收通量白天高夜晚低。处理间比较,常规耕作无秸秆还田处理>常规耕作秸秆还田处理>免耕。结论:常规耕作无秸秆还田处理CH4的吸收通量较高,但此种耕作方式不利于土壤耕层的保护,而耙耕、旋耕这两种保护性耕作方式使表层土壤具有较好的保墒保肥能力,对土壤扰动小,且只比常规无秸秆还田的CH4吸收值低535%和6.31%,较有利于农业减排,所以从环境效益和土壤保护这两个方面来看,耙耕和旋耕这两种保护性耕作处理较为理想。

    Abstract:

    North China is one of the major grain producing areas in China, the calculation of the soil CH4 uptake and emission in this area play important role in estimating accurately China′s emission amount of agricultural greenhouse gas and establishing reasonably agricultural mitigation and adaptation measures. In this study, the dynamic change and diurnal variation of soil CH4 flux in five tillage models during different growth periods in North China were studied using the Static-Chamber method and the Gas Chromatography(GC). The results showed that, CH4 flux had obvious dynamic change under different tillage models in different growth periods. All treatments were the sink of CH4 absorption. Comparison of CH4 uptake among different treatments indicated that CH4 uptake flux under AC≈PC > PH≈PR>PS>PZ. CH4 uptake flux also had obvious diurnal variation, higher in the daytime and lower in night. Comparison of CH4 uptake flux among different treatments showed that AC > PC > PZ. As a result, CH4 absorption flux was higher in the treatment of straw absence & conventional tillage, but this model was not conducive to protect plough layer. In comparison, harrow and rotary were both conservation tillage methods to keep a better ability for both soil moisture and fertilizers, and less disturbance to the soil. Furthermore, CH4 uptake were only decreased by 5.35%,6.31%, respectively, in the harrow and rotary conservation tillage methods than that in straw absence & conventional tillage method, and favorite to agricultural mitigation emissions. This investigation proved that harrow and rotary conservation tillage systems were ideal to benefits environmental and soil plough layer.

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田慎重,宁堂原,李增嘉*,王瑜,李洪杰,仲惟磊.不同耕作措施对华北地区麦田CH4吸收通量的影响.生态学报,2010,30(2):541~548

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