不同开垦年限黑土耕层有机无机复合体变化及有机碳组分分布特征

以辰光和郭家不同开垦年限耕层黑土土壤为研究对象,探讨了有机无机复合体含量变化及有机碳组分变化在有机无机复合体中的分布规律,结果表明:土壤黏粒级复合体的含量随着开垦年限的延长而增加,粉粒及细砂级复合体的含量随着开垦年限的延长相应减少。随着复合体粒径的增大,各级土壤复合体中的有机碳及其组分含量均呈下降趋势。黏粒级复合体含量与黏粒级复合体中有机碳及组分含量之间具有显著的负相关,而粉砂和细砂级复合体含量与有机碳及组分含量之间具有显著的正相关。图2,表1,参15。

The variation of organic-mineral complex content and the distribution characteristics of organic carbon fractions in black soil plough layer under different tillage periods

The tillage layer black soil of different tillage period in Chenguang and Guojia were chosen to be as study object. The results show that the content of clay organic-mineral complex is increasing with tillage period extent, while the content of silt organic-mineral complex and the fine sand organic-mineral complex are decreasing. Content of organic carbon and its fractions in organic-mineral complex is decreasing with increasing of granule diameter of organic-mineral complex. There is evident negative correlation between the organic carbon fractions content in clay organic-mineral complex and the content of clay organic-mineral complex, and there are obvious positive correlation between the organic carbon content in silt organic-mineral complex and fine sand organic-mineral complex and the content of silt organic-mineral complex and fine sand organic-mineral complex in soil.