土壤学报2012，Vol.49Issue(1)：68-76,9.
黄土高原草地土壤有机碳分布及其影响因素
DISTRIBUTION OF SOIL ORGANIC CARBON IN GRASSLAND ON LOESS PLATEAU AND ITS INFLUENCING FACTORS
摘要
Abstract
Distribution of soil organic carbon ( SOC ) and its affecting factors in four different types of natural grasslands ( forest steppe, typical grassland, alpine meadow steppe and desert steppe) in the Loess Plateau were analyzed. Results show that content of soil organic carbon decreases with soil depth, and is significantly higher in 0 ~ 20 cm than in 20 ~ 40 cm, 40 - 60 cm, 60 - 80 cm and 80 -100 cm. In the 0 ~ 40 cm soil layer, the distribution of organic car-bon content in the four types of grasslands tends to be in the order of Alpine meadow steppe > typical grassland > forest steppe > desert steppe; while in the 40 ~ 100 cm soil layer, in the order of Alpine meadow steppe > forest steppe > typical grassland > desert steppe. In the Alpine meadow steppe, forest steppe and typical steppe of the Loess Plateau, soil organic carbon is concentrated in the surface layer (0 ~40 cm) , accounting for 71% , 50% and 46% of the total in the profile (0 - 100 cm) , while the distribution is more uniform in the desert steppe; Soil organic carbon content is positively related (p <0. 01 ) to altitude; in the 0 ~ 40 cm soil layer, to soil water content (p < 0. 01 ) ; and to total nitrogen ( r = 0. 984 3) ;but negatively related to annual mean temperature (p < 0. 01 ). Moreover, it has no obvious relationship with annual precipitation in the 100 cm soil layer in all the four types of grasslands.关键词
黄土高原/草地/土壤/有机碳/分布特征/影响因素Key words
Loess Plateau/ Grassland/ Soil/ Organic carbon/ Distribution/ Influencing factors分类
农业科技引用本文复制引用
刘伟,程积民,高阳,程杰,梁万鹏..黄土高原草地土壤有机碳分布及其影响因素[J].土壤学报,2012,49(1):68-76,9.基金项目
中国科学院战略性先导科技专项——应对气候变化的碳收支认证及相关问题(XDA05050202)、黄土高原土壤侵蚀与旱地农业国家重点实验室基金项目(10502-Z8)、中国科学院重要方向项目(KZCX2-YW-441 、KZCX2-YW-149)、国家重点基础研究发展计划973项目(2007CB106803)资助 （XDA05050202）
