榆阳区不同植被类型土壤有机碳含量及其影响因素.

The forest ecosystem in Yuyang District is in the primary succession stage of vegetation construction in the new period. The study of the change characteristics and influencing factors of soil organic carbon storage under different vegetation types is conducive to the restoration of forest ecosystems and the rational use of land. Taking five typical vegetation in Yuyang District as the research object, the content of organic carbon in different soil layers was measured, and the storage characteristics of soil organic carbon in 0-100 cm of different vegetation types and their relationship with soil environmental factors were discussed. (1) Under different vegetation types, the average content of soil organic carbon was Pinus tabulaeformis forest(5.62 g·kgkg–1) > Pinus sylvestris forest(4.13 g·kgkg–1) > Platycladus orientalis forest(3.44 g·kgkg–1) > Hippophae rhamnoides forest(2.75 g·kgkg–1) > grassland(1.37 g·kgkg–1), The average content of soil organic carbon in Pinus tabulaeformis forest was significantly different from that in Platycladus orientalis, Hippophae rhamnoides forest and grassland (P < 0.05). (2) The soil organic carbon storage of different vegetation types ranged from 21.08 t·hm–2 to 76.16 t·hm–2. (3) The correlation between soil organic carbon and soil physical and chemical properties was different in various vegetations. From the perspective of the five types of vegetation, organic carbon and electrical conductivity were extremely significantly positively correlated (P < 0.01), which was related to total porosity and total porosity. The saturated water content was significantly positively correlated (P < 0.05). The storage characteristics of organic carbon under different vegetation types in Yuyang area were different, and the electrical conductivity, total porosity and saturated water content significantly affect the accumulation of soil organic carbon in woodland. [ABSTRACT FROM AUTHOR]