Study On The Ecosystem Carbon Storage Of Different Land Use Types In The TaiHang Mountain

The more attention are paid on the increasing atmosphere CO₂ concentration and itsseries effect on environment. With the recent reducing of forest sourcing, more and moreroles are played for plantation in forest ecological system.This study determined a land use system with higher carbon storage for thetheoretical guidance in exploring and using limit soil resource and increasing organiccarbon storage based on the background of warming in global climate, during therecovering of vegetation in Taihang Mountain. Six land use systems of Pinustabulaeformis Carr. forest, Robinia pseudoacaca forest, Quercus variabilis forest,Castanea mollissima Blume forest, shrubbery and farmland were studied for thecomparisons of total carbon storage and sub storage of vegetation, Litter fall and soil byanalyzing of biomass and carbon content between different organs, different space anddifferent soil layers. The results were shown as followed:(1) total carbon storage: the total carbon storage of ecological system was 87229.03 t,convert to economical benefit was RMB 22768.1 thousand(forestation cost method) andRMB108 million(SWEDEN carbon tax method). Among all the land use systems,Castanea mollissima Blume forest hold the max carbon storage with 31299.16t, thesecond was Quercus variabilis forest and Robinia pseudoacaca forest, the least wasLitter fall with 1543.88t. The carbon storage of crop plant changed with seasons andreached the max twice at June and September. However, it is far lower than those ofother forests.(2) Comparison of each carbon storage:the common degressive gradation of carbonstorage in the whole ecological system and each type of forest was:soil＞vegetation＞Litter fall;(3)Carbon content of vegetation: differences between forests and between parts of aforest were not significant, varying in the range of 40%～53%. The carbon content of eachorgan of Pinus tabulaeformis Carr. forest was higher than the other forests. While for thecomparison of carbon between difference space of a forest, tree stratum＞bush layer＞herb layer. The carbon content of each organ varied with the forest, and cortex of Pinustabulaeformis Carr. forest hold the max value and the leaf of Quercus variabilis forest hold the least.(4) Litter fall: Pinus tabulaeformis Carr. forest hold the max carbon density in Litter fall,the second is Robinia pseudoacaca forest, and the least is shrubbery. The percent ofcarbon density in the non-decomposed layer and decomposing layer vary betweendifferent forests; The carbon content of non-decomposed layer are higher than that ofdecomposing layer in litter fall for all the forest.(5) Soil: the difference of organ carbon content in soil present significant in different landuse types and the economic forest＞soil and water conservation forest＞farmland; soilorgan carbon and its density decreased with increasing soil depth, while different degreesexit in different land use types.The result showed that economic forest hold the highest carbon storage among thesix forest types in Qiannanyu region. Therefore, the conclusion could be used forreference during the course of vegetation restoration.