Abstract:

Abstract：In this paper, we studied the content of soil organic carbon storage and vertical distribution about natural forest Pinus tabulaeformis f. shekannesis, Quercus liaotungensis and artificial P. tabulaeformis in Ziwuling forest area. The results were showed as followings: (1) Content of soil organic carbon for three forests respectively was: 13.67g/kg, 13.95g/kg, and 11.43g/kg. Soil organic carbon contents generally decreased with depth of soil, but decrease range was different for the three forest type. Meanwhile, great significance differences have appeared among different soil layers. (2) Soil carbon density in the three forest types change greatly, with a range of 0.53~3.53 kg/m2 for five soil depth intervals. Soil carbon density decreased generally with the depth, too. In the whole soil profile, the range of carbon density was 9.38-11.43 kg/m2, and 80% carbon concentrated in 50cm depth of soil. 3) Soil carbon storage is low in these three forests. The average of storage was 105.2t/hm2, and large differences appeared between stands.