摘要
黄土高原地区开展退耕还林还草,不仅会改变生态环境,也势必培育土壤,影响全球碳循环。要准确预测退耕还林对黄土高原乃至全球未来环境的影响作用,需要估算目前黄土高原地区土壤有机碳量。根据第二次土壤普查资料和土壤类型图,计算了黄土高原地区表层土壤有机碳密度和储量。结果表明,黄土高原地区0～20cm土壤有机碳密度变幅为0.66～12.18kgC/m2,其中大部分土壤有机碳密度集中在1～4kgC/m2,土壤有机碳面积平均加权值为2.49kgC/m2,总储量为1068Tg。此结果可为水土保持的环境效益评价提供背景资料,以便通过对比分析退耕还林前后的土壤碳密度,预测未来区域生态环境状况。
Based on soil type data from the Second National Soil Survey and soil type map,soil organic carbon density and stocks of topsoil in Loess Plateau were calculated .The results showed that soil organic carbon density in 0～20 cm depth varied from 0.66～12.18 kgC/m2 in Loess Plateau, most in a range from 1～4 kgC/m2,a mean value of 2.49 kgC/m2,and total 1 068 Tg.This paper can provide the background materials for assessment of environmental benefit of water and soil conservation,so that we can analysis and contrast the soil organic carbon density before and after closing land for forest or grass and predict the future ecosystem conditions.
出处
《水土保持学报》
CSCD
北大核心
2003年第3期13-15,共3页
Journal of Soil and Water Conservation
基金
国家自然科学基金(40271072)
黄土高原土壤侵蚀和旱地农业国家重点实验室基金资助
