中国水土保持科学2011，Vol.9Issue(4)：72-77,6.
黄土丘陵区柠条人工林土壤有机碳动态及其影响因子
Dynamics of soil organic carbon in Caragana microphylla forest and its relationship with environment factors in loess hilly region
摘要
Abstract
The variation rule of soil organic carbon density in the growing process of man-made forest was studied by taking Caragana microphylla plantation in loess hilly region as the research object with field survey and laboratory analysis. The results indicated as follows; 1 ) Soil organic carbon are mainly distributed in the 0-20 cm soil layer, which accounted for 49% to 63% of total soil organic carbon content in 0 - 50 cm soil layer. 2 ) Compared with the control, the soil organic carbon density of C. microphylla plantations decreased firstly, then increased,and stabilized finally overgrowing process. Total soil organic carbon density of C. microphylla plantation in age 10 a,26 a,40 a,50 a were respectively 1.555, 3. 236, 2.775, 2.444 kg/m . The highest value was in 26a-woodland. It tent to stable over forest age. 3) Correlation analysis showed that there was a significant negative correlation between soil organic carbon content and soil bulk density, soil bulk density decreased over forest age. So it can be concluded that C. microphylla could improve soil organic carbon content indirectly by affecting soil characteristics. The soil organic carbon content had significant positive relation with root biomass and the content of total nitrogen, which proved that the root growth and nitrogen fixation characteristics of C.microphylla contributed to soil organic carbon accumulation.关键词
柠条/造林/土壤有机碳密度/土壤有机碳积累Key words
Caragana microphylla/ afforestation/ soil organic carbon density/ soil organic carbon accumulation引用本文复制引用
曲卫东,陈云明,王琳琳,张飞,张学伍..黄土丘陵区柠条人工林土壤有机碳动态及其影响因子[J].中国水土保持科学,2011,9(4):72-77,6.基金项目
中国科学院百人计划项目“黄土高原半干旱区群落水分平衡与调控机理”(kzcx2-yw-BR-02) （kzcx2-yw-BR-02）
陕西省科学院科技计划重点项目“陕北黄土丘陵区植被恢复及动植物多样性保护关键技术”(2008k-04) （2008k-04）
