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通过收集我国1980~2006年以来966个样点农田耕层土壤有机碳的实测数据,以及各样点的气温和降水数据,分析中国农田土壤有机碳变化特征,对变化的原因和发展趋势进行了探讨,对比分析了气温与降水对水稻土与旱作土固碳能力的差异,以及气温和降水对不同区域土壤有机碳的影响。结果表明:总体上我国实测点耕作表层土壤有机碳呈上升趋势,79%增幅样本主要集中在年增幅为0~3%的区间。农田土壤有机碳的含量受制于气温与降水,及水热条件的组合。20年来,全国农田土壤耕层有机碳含量的分布格局没变。农田土壤有机碳的变化,主要受人类活动的影响。土地利用方式对土壤固碳差异明显,水稻土有机碳水平明显高于旱地,水田耕层有机碳含量为旱地耕层有机碳含量的175~176%。
By collecting the data of soil organic carbon in topsoil of 966 sample plots in China from 1980 to 2006, and the temperature and precipitation data of various plots, the characteristics of soil organic carbon in farmland in China were analyzed, and the reasons for the change and the development trend were analyzed The effects of temperature and precipitation on carbon sequestration between paddy and upland soil were compared and analyzed. The effects of temperature and precipitation on soil organic carbon in different areas were also analyzed. The results showed that on the whole, the soil organic carbon in the surface tillage at the measured point in China showed an upward trend. The samples with 79% increase mainly concentrated in the range of 0 ~ 3% annual increase. Soil organic carbon content in farmland is subject to the combination of temperature and precipitation, and hydrothermal conditions. Over the past 20 years, the distribution pattern of soil organic carbon in farmland soils has not changed. The change of soil organic carbon in farmland is mainly affected by human activities. The carbon sequestration of soil was obviously different with the land use pattern. The content of organic carbon in paddy soil was obviously higher than that in dry land. The content of organic carbon in paddy soil was 175-176% of the organic carbon in dry land.