草地对碳汇的作用  

ROLE OF GRASSLAND IN SOIL CARBON SINK

作　　者：王文[1] 

机构地区：[1]甘肃农业大学草业学院,甘肃兰州730070

出　　处：《青海草业》2010年第4期16-19,共4页Qinghai Prataculture

摘　　要：草地利用和管理方式是维系草地农业生态系统土壤碳平衡的重要机制之一，土壤植被的改变是土壤有机碳变化的驱动力，不同利用方式的土壤有机碳含量有明显差异，0～100cm土壤有机碳密度的变化顺序为：人工灌木林地〉次生天然草地〉人工草地〉弃耕地〉农田。放牧作为主要草地利用方式，不同强度对草地有机碳含量有显著影响，0-10cm和10～20cm土层中土壤有机碳含量随放牧强度的增加而下降，中度放牧区和重放牧区分别显著低于未放牧区。乱开乱垦对草地植被初级生产力产生严重影响，使植被盖度和草地初级生产力严重下降，导致0～20cm和20～40cm土壤有机碳含量降低。Grassland utilization and management form is one of carbon balance of grassland soil organic carbon content. agricuhural ecosystem. The change There are obvious discrepancies of the important mechanisms to maintain the soil of soil vegetation is major force of fluctuation of soil organic carbon content with the different u- tilization. Within 100cm, the content of soil organic carbon gradually decreases as follow： manmade shrubbery, regenerative natural grassland, manmade grassland, abandoned infield and farmland. As the major grassland u- tilization, the strength of grazing affects the content of soil organic carbon distinctly. It declines with the enhancement of grazing both between the depth of 0cm to 10cm and 10cm to 20cm. There is marked difference between moderate grazing or grave grazing and intact pasturing area. Additionally, assorting grasslan cover of vegetation and decreases the production of pasture, in that it drops the soil organic carbon to 20cm and 20cm to 40cm d lessons the both in 0cm

关 键 词：草地 利用方式 碳汇 

分 类 号：S812[农业科学—草业科学]