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本研究以巴音布鲁克湿地和农田灰漠土原状土为研究对象,进行原位模拟降雨试验,利用LI-8100土壤碳通量自动测量系统测定土壤的CO_2排放,研究了不同降雨量对土壤CO_2排放的影响。结果表明:降雨导致湿地土壤CO_2释放速率显著增加(P<0.01),而农田土壤无显著差异。在其含水量无明显差异下,湿地不同降雨处理组的CO_2排放量均大于农田组,湿地土壤CO_2日累积排放量降水10 mm组>降水20 mm组>对照组,土壤有机碳高的湿地土壤随降雨量增加,土壤短期碳损失高,而对低有机碳土壤(西北干旱区贫瘠土壤)短期碳损失影响不显著。降雨后农田土壤降水10 mm组CO_2排放与地表温度和5 cm地温相关性极显著(P<0.01),其他各处理均未呈现显著相关。说明在干旱半干旱区降雨量对土壤CO_2排放速率有着重要的影响。
In this study, Bayinbuluke wetland and farmland gray desert undisturbed soil were selected as the research object, in-situ simulated rainfall test was carried out, and soil CO_2 emission was measured by LI-8100 soil carbon flux automatic measuring system. The effect of different rainfall on soil CO_2 Impact of emissions. The results showed that rainfall led to a significant increase in CO 2 release rate (P <0.01), but no significant difference in farmland soil. Under the condition of no significant difference in water content, CO 2 emission of different rainfall treatment groups in wetland was higher than that in farmland group, and the emission of CO_2 in wetland soil was lower than that in 10 mm water group> 20 mm precipitation group> control group, wetland soil with high organic carbon With the increase of rainfall, the short-term carbon loss of soil is high, while the short-term carbon loss of low organic carbon soil (poor soil in Northwest arid region) is not significant. There was a significant correlation between CO 2 emission and surface temperature and 5 cm ground temperature (P <0.01) after 10-mm precipitation in farmland after rainfall. No significant correlation was found between other treatments. It shows that rainfall in arid and semiarid regions has an important impact on the rate of soil CO2 emission.