The distribution characteristics and the infulential factors of the topsoil (0-20cm) organic carbon in alpine grassland eocsystem at the southeast slope of Nyainqêntanglha Mountain were studied. It was shown that the average density of the topsoil (0-20cm) organic carbon was 5.0028±1.1037 kg/m2 and variability coefficient was 21.96%.With inreasing altitude, the distribution characteristics of the topsoil (0-20 cm) organic carbon density was increase→decrease →increase within the altitude range of 4421-4598 m.There was significant positive correlation between the topsoil organic carbon density and overground biomass, 10-20-cm underground biomass, 20-30-cm underground soil moisture,soil organic matter,soil active N, soil total N and soil total P content, but there was significant negative correlation between it and soil bulk density. The first factors were vegetation coverage, overground biomass, 20-30-cm underground biomass and 20-30-cm soil moisture, the second factors were 0-20-cm and 20-40-cm underground soil bulk density as well as soil total P content, the third factor were soil organic matter and soil active N content, the last factor was 0-10-cm underground biomass, and they contribution rate was 92.83 %.
WANG Jian-lin, OUYANG Hua, WANG Zhong-hong, CHANG Tian-jun, Li Peng, SHEN Zhen-xi, ZHONG Zhi-ming
. Influential Factors and Distribution Characteristics of Topsoil Organic Carbon in Alpine Grassland Ecosystem at Southeast Slope of Nyainq阯tanglha Mountain[J]. SCIENTIA GEOGRAPHICA SINICA, 2009
, 29(3)
: 385
-390
.
DOI: 10.13249/j.cnki.sgs.2009.03.385
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