Soil Organic Carbon Storage And Its Distribution Of The Typical Communities In The North Region Of Yanshan Mountain

The northeast region of Yanshan Mountain is the transition from Yanshan mountainous region to the plateau region and the ecotone between the plateau froest-grassland and Yanshan mountain forest.This area's forest has the obvious region characteristic, which belongs to the mountainous region forest to the dam on the forest steppe transition intermediate form, it is the important component in the north of Chinese forest,which has an unique and important ecology status in our country. This article is based on the analyzes and spot investigation and experiment, such as the Spiraea shrub, the Hazel shrub,the natural Aspen-Brich forest and the artificial larch forest.The conclusions are follows:(1)On each soil layer, the Spiraea shrub which is is under the human and animals disturbed condition is obviously to be lower than the other three kind of community type(the Hazel shrub,the natural Aspen-Brich forest and the artificial larch forest), also, there is not lied in the front soil layer,without the external disturbance,there is not he remarkable difference of the other three types.(2) Soil organic density of the community-type in the north of Yan shan mountain(except for the Spiraea shrub)is higher than the corresponding a community-type, and also is higher than the average level of Yan shan mountain and southern and central parts of the taihang mountain, but is lower than the mountain. of the northeast of china.(3)The soil organic carbon content and depth of soil's relational availability index function carries on the description, the 40cm soil layer depth is the soil organic carbon content change inflection point.in the the Spiraea shrub community, the organic carbon content has not displayed the consistent rule with the slope position's between correlational dependence; In the hazel brush community, each soil layer's organic carbon content along with the slope position the tendency which reduces presents increases; Secondary Yang Hualin and the artificial fallen leaf pinery two types both are (0-10cm) on display the tendency which in the surface layer reduces along with the slope position reduces, but other various levels' change rule is inconsistent.(4)Four kind of typical plant community's total organic carbon density condition is: the natural Aspen-Brich forest (186.50 t/hm2), the artificial larch forest (179.98 t/hm2), the hazel brush (119.55 t/hm2), the Spiraea shrub (57.07 t/hm2). Soil organic carbon lied in a large proportion of the density of total rganic carbon density,the proportion of total rganic carbon density in four typical communities is as flows: the Spiraea shrub is 94.35% , the Hazel shrub is 91.87% ,the natural Aspen-Brich forest is 87.79% and the artificial larch forest is 77.43%.(5)Soil organic carbon content of the natural Aspen-Brich forest and the artificial larch forest don`t show the obvious relations in the age of the forest.