摘要
本试验研究了不同开垦年限黑土有机碳的数量、组成、结合形态的变化 ,试验研究结果表明 :垦后黑土 0～2 0cm土层土壤有机碳数量不断下降 ,年有机碳矿化速率为 1 72 % ,达到平衡后有机碳数量为 7 2 7g/kg ,土壤有机碳的H/F比升高 ,氧化稳定性增强 ,土壤有机—无机复合度升高 ,土壤有机碳松紧比下降。 2 0～ 40cm土层土壤有机碳在垦后 2 2年内升高 ,以后又下降 ,土壤H/F比无显著变化规律 ,土壤有机质氧化稳定性提高 ,土壤有机—无机复合度下降 。
The results from the experiment showed that the content of organic C decreased in toplayer (0～20 cm) of black soils after reclamation, with the annual organic C mineralization rate of 1.72%. The organic matter content could reach 7 27g/kg when it is balanced. The H/F ratio of humus rose and the oxidation stability strengthened. The degree of organo-mineral complex also increased, but the ratio of loose to tight humus fractions decreased. In the 20～40cm soil layer, the organic C content increased after 22 years reclamation, and then decreased. The humus oxidation stability strengthened, while the degree of organo mineral complex and the ratio of loose to tight humus decreased.
出处
《土壤通报》
CAS
CSCD
北大核心
2002年第5期332-335,共4页
Chinese Journal of Soil Science
基金
国家重点基础研究发展规划项目 (G1 9990 1 1 81 0 )
