人类活动对锡林郭勒地区主要草原土壤有机碳分布的影响.pdf

1998, 22( 6) 545551 Acta Phy toecologica Sini ca X 王艳芬　陈佐忠　　　　　　Larry T T ieszen. ( , 100093) ( Augustana College, S . D. 5 19 , U. S . A. ) 3, : , , 015cm 34% 38% , 035cm , DISTRIBUTION OF SOIL ORGANIC CARBON IN THE MAJOR , , GRASSLANDS OF XILINGUOLE INNER MONGOLIA CHINA Wang Yanfen and Chen Zuozhong ( Institute of B otany, CAS , Beij ing 100093) Larry T . T ieszen ( Dep t. of Biology, A ug ustana College, S ioux Falls, S . D . 5 19 USA) AbstractT he distribution of soil organic carbon in temperate grassland in Xilinguole, Inner Mongolia w as ex amined. Soil organic carbon content varied considerably among the sites and along soil profile. It increased along the gradient from desert steppe, typical steppe to mead- ow steppe, w hile it decreased depth. It distributed mainly in 015cm of the top soil layer, . The effect of landuse pattern on soil organic carbon content was also investigated In the meadow steppe, organic carbon of soil ( 035cm) was seriously affected by the conversion of grasslands to croplands It decreased by. 35% 38% . While in the typical steppe area where grazing management w orks as primary landuse pattern, it was not affected by grazing intensi- ties in the 1 years. Key wor sSoil organic carbon ( SOC) , Xilinguole Steppe, Cultivation, Grazing 3( Post et al . , 1990; Houghton, 1995) , ( Rabenhorst, 1995) X199 -12-10, 1998-03-16 ( 49 90020) 546 22 , , , NP , , 1 , , 19. 6 ( , 1995)