不同土地利用类型下川西亚高山土壤活性有机碳研究

采用常规方法,测定、分析了川西亚高山5种不同土地利用类型的土壤活性有机碳含量,结果显示土壤有机碳含量均是上层大于下层。在0～10cm土层土壤总有机碳含量表现为灌木林地落叶松林地退耕还林地云杉林地农田;10～20cm土层土壤总有机碳含量表现为灌木林地落叶松林地云杉林地退耕还林地农田。上下层平均值来看灌木林地有机碳含量最高为79.86g.kg-1,是云杉林地的2.85倍,是落叶松林地的1.49倍,是退耕还林地的1.62倍,是农田的3.34倍,表现为灌木林地落叶松林地退耕还林地云杉林地农田。上下层土壤微生物生物量碳含量均表现为灌木林地落叶松林地退耕还林地云杉林地农田;上下层土壤水溶性有机碳含量均表现为落叶松林地灌木林地云杉林地退耕还林地农田。

Soil Active Organic Carbon under Different Types of Land Use

Soil active organic carbon content in five different types of land use in west Sichuan were ana- lyzed. The results showed that soil organic carbon content is greater in upper layer than the bottom layer. For the layer 0--10cm, soil total organic carbon（TOC） content performance follows the order： shrub〉larch forest〉restored forest〉spruce〉farmland. In the layer 10--20cm, organic content is shrubbery〉larch forest〉spruce〉restored forest〉farmland. For the average organic content over the upper and lower layer, it is 79. 86 g kg-1 in shrub land the highest and also 2. 85 times that of spruce, 1.49 times that of larch forest, 1.62 times that of restored forest, and 3. 34 times that of farmland. Carbon content of soil microbial biomass over the upper and lower layer follows the order： shrub〉larch forest〉spruce〉restored forest〉farmland, whereas soil water soluble organic carbon content over upper and lower layer is larch forest〉shrubbery〉spruce〉restored forest〉farmland.