名山河流域不同土壤类型和土地利用方式下有机碳的分布特征

发布时间：2018-03-12 08:47

本文选题：土壤有机碳　切入点：土壤团聚体　出处：《水土保持学报》2017年03期 　论文类型：期刊论文

【摘要】：以名山河流域不同类型土壤为研究对象,研究了不同土地利用方式下土壤有机碳和团聚体中有机碳含量的分布特征。结果表明:(1)名山河流域3种类型的土壤有机碳含量在17.50~34.70g/kg之间,含量高低表现为水稻土黄壤紫色土,水稻土含量分别是黄壤和紫色土的1.32,1.39倍;从不同的土地利用方式看,水田土壤有机碳及活性有机碳含量显著高于旱地、茶园和果园,土壤活性有机碳与土壤有机碳呈极显著正相关(R2=0.884 6);(2)土壤有机碳含量在土壤剖面中表现出随着土层深度的增加而降低的趋势,表层土壤(0—20cm)有机碳含量由高到低依次为水稻土黄壤紫色土,下层土壤(20—40cm)有机碳含量为水稻土紫色土黄壤,土壤活性有机碳含量的分布具有相似规律;(3)在不同土地利用方式下,表层土壤(0—20cm)有机碳含量大小关系表现为水田旱地果园茶园,下层土壤(20—40cm)有机碳含量表现为水田果园茶园旱地,水田表层、下层土壤活性有机碳含量均极显著地高于旱地、果园、茶园,再次证明活性有机碳是表征有机碳特性的重要指标;(4)3种类型土壤的团聚体在不同的利用方式下的有机碳含量表现出随着土壤剖面加深而降低的趋势,土壤团聚体的单位有机碳含量随着粒径的减小呈现波浪形的变化趋势,各粒径团聚体中的有机碳含量与土壤有机碳含量呈正相关关系。综上可知,土壤类型的差异和土地利用方式的不同会对土壤有机碳及各粒径团聚体中有机碳的含量及分布特征产生一定的影响。
[Abstract]:Taking different types of soil in the Minshan River Basin as the research object, The distribution characteristics of soil organic carbon and organic carbon in aggregates under different land use patterns were studied. The results showed that the soil organic carbon contents of three types of soil in Mingshan River Basin ranged from 17.50 to 34.70 g / kg, showing that the content of soil organic carbon was high or low in paddy soil yellow purple soil. Compared with yellow soil and purple soil, the content of soil organic carbon and active organic carbon in paddy soil were 1.32 ~ 1.39 times higher than those in upland, tea garden and orchard, respectively, and the soil organic carbon and active organic carbon in paddy field were significantly higher than those in upland, tea garden and orchard. There was a significant positive correlation between soil active organic carbon and soil organic carbon.) the content of soil organic carbon in soil profile decreased with the increase of soil depth. The organic carbon content of surface soil is 0-20 cm) the order of soil organic carbon content is paddy soil yellow soil purple soil, the lower layer soil is purple soil yellow soil, and the distribution of soil active organic carbon content has the similar law under different land use mode, the soil active organic carbon content of the surface soil is from high to low to the paddy soil yellow soil purple soil, the lower layer soil is the paddy soil purple soil yellow soil, the soil active organic carbon content distribution has the similar rule. The content of organic carbon in surface soil (0-20 cm) was significantly higher than that in dry land (20 ~ 40 cm) of paddy field, and the content of active organic carbon in surface and lower layer of paddy field was significantly higher than that in dry land, and the content of organic carbon in lower layer of soil was significantly higher than that in dry land, and the content of organic carbon in lower soil was 20-40 cm (P < 0.05). In tea garden, it was proved once again that active organic carbon is an important index to characterize the characteristics of organic carbon. The content of organic carbon in three types of soil aggregates under different utilization patterns showed a tendency of decreasing with the deepening of soil profile. The content of organic carbon per unit of soil aggregates showed a wavy trend with the decrease of particle size, and there was a positive correlation between the content of organic carbon in aggregates and the content of soil organic carbon. The difference of soil types and land use patterns will have a certain effect on the content and distribution of organic carbon in soil and aggregates with different particle sizes.
【作者单位】：四川农业大学环境学院;四川农业大学资源学院;雅安市环境保护局;
【基金】：四川省学术和技术带头人培养基金项目(2014) 四川农业大学学科建设双支计划项目(2016)
【分类号】：S153.6

【相似文献】