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| 黄土高原草地土壤有机碳分布及其影响因素 | |
| 引用本文： | 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. |
| 作者姓名： | 刘伟 程积民 高阳 程杰 梁万鹏 |
| 作者单位： | 1. 中国科学院水利部水土保持研究所,陕西杨凌712100;中国科学院研究生院,北京100049 2. 中国科学院水利部水土保持研究所,陕西杨凌,712100 3. 西北农林科技大学动物科技学院,陕西杨凌,712100 |
| 基金项目： | 国家重点实验室基金项目;中国科学院重要方向项目;国家重点基础研究发展计划（973计划）;国家自然科学基金项目（面上项目，重点项目，重大项目）;林业公益性行业科研专项项目 |
| 摘 要： | 以黄土高原水平方向的4种主要草地类型为研究对象,分析了不同草地类型土壤有机碳(SOC)的分布特征及其影响因素。结果表明:土壤有机碳含量随土壤深度的增加而降低,其中0～20 cm土壤有机碳含量与20～40、40～60、60～80、80～100 cm有机碳含量差异显著。4种草地类型土壤有机碳含量分布规律:0～40 cm为高山草甸草原>典型草原>森林草原>荒漠草原,40～100 cm为高山草甸草原>森林草原>典型草原>荒漠草原;4种草地类型中各土层土壤有机碳含量最高的是高寒草甸,其空间变异最大,最小的是荒漠草原,其变异最小。黄土高原上高寒草甸草原、森林草原、典型草原土壤有机碳均集中分布在浅表层0～40 cm,分别占0～100 cm的71%、50%、46%,而荒漠草原各层分布较均匀;黄土高原土壤有机碳含量与海拔高度呈显著正相关(p<0.01);0～40 cm土壤有机碳含量与土壤含水量呈显著正相关(p<0.01);与全氮有极显著的正相关性,相关系数达0.984 3;与年均温呈极显著负相关(p<0.01),几种草地类型100 cm深土壤有机碳含量与年降水量无明显相关。 |
| 关 键 词： | 黄土高原 草地 土壤 有机碳 分布特征 影响因素 |
| 收稿时间： | 9/6/2010 12:00:00 AM |
| 修稿时间： | 2011/3/10 0:00:00 |
Distribution of soil organic carbon in grassland on Loess Plateau and its influencing factors |
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| liuwei,Cheng Jimin,Gao Yang,Cheng Jie and Liang Wanpeng.Distribution of soil organic carbon in grassland on Loess Plateau and its influencing factors[J].Acta Pedologica Sinica,2012,49(1):68-76. | |
| Authors: | liuwei Cheng Jimin Gao Yang Cheng Jie and Liang Wanpeng |
| Institution: | Institute of Soil and Water Conservation, Chinese Academy of Sciences& Ministry of Water Resources |
| 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 carbon 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. |
| Keywords: | Loess plateau Grassland Soil Organic carbon Distribution Influencing factors |
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