| 北京山区土壤有机碳分布及其影响因素研究 |
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| 引用本文： | 王秀丽,张凤荣,朱泰峰,周建,吴昊,杨黎芳.北京山区土壤有机碳分布及其影响因素研究[J].资源科学,2013,35(6):1152-1158. |
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| 作者姓名： | 王秀丽 张凤荣 朱泰峰 周建 吴昊 杨黎芳 |
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| 作者单位： | 1. 中国农业大学资源与环境学院,北京,100193
2. 天津农学院,天津,300384 |
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| 基金项目： | 国家科技基础性工作专项(编号:2008FY110600);国家科技基础性工作专项(编号:2012FY112100)。 |
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| 摘 要： | 基于野外调查与室内分析相结合的方法,以北京山区650典型土壤类型剖面的1650样品数据,研究土壤有机碳分布及与影响因素间的关系.结果表明,研究区有机碳平均含量为(12.61±9.58)g/kg,属中下水平,变异系数为76.02,中等变异.土壤表层有机碳含量与海拔、植被覆盖度显著正相关,与温度显著负相关,即海拔所造成的水热条件和植被覆盖度的差异是影响其分布的主导环境因子.土壤有机碳含量在剖面中的垂直分布规律为:表层到亚表层下降速率显著,达44.48％,亚表层以下下降速率趋缓,均小于20％,土体构型与之关系密切,均质型土壤有机碳变化速率平缓,有强烈对比的土体构型变化较剧烈；而不同植被类型下,土壤表层到亚表层的有机碳含量下降速率依次为:针叶林(10.15％)＜草甸类(18.75％)＜落叶阔叶林(19.12％)＜中生林草(31.65％)＜中旱生林灌(64.09％),地表上有无枯枝落叶层及其厚薄对此产生了重要影响.在人类活动主要区域内,耕作土壤有机碳平均含量与变异性均小于自然土壤,其中园地的有机碳含量最低,荒草地的变异程度最强,是否受到人类活动的干扰与不合理利用,以及地表植被类型差异与其有着重要关系.
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| 关 键 词： | 山区 土壤有机碳 分布 影响因素 北京 |
| 修稿时间： | 4/8/2013 12:00:00 AM |
The Distribution and Impact Factors of Soil Organic Carbon in Mountainous Areas of Beijing |
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| WANG Xiuli,ZHANG Fengrong,ZHU Taifeng,ZHOU Jian,WU Hao and YANG Lifang.The Distribution and Impact Factors of Soil Organic Carbon in Mountainous Areas of Beijing[J].Resources Science,2013,35(6):1152-1158. |
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| Authors: | WANG Xiuli ZHANG Fengrong ZHU Taifeng ZHOU Jian WU Hao and YANG Lifang |
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| Institution: | College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;Tianjin Agricultural University, Tianjin 300384, China |
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| Abstract: | As an important part of soil fertility, soil organic matter plays a key role in agri-ecosystem sustainability, the rational use of land resources and land assessment. Based on laboratory analyses and field surveys in mountainous areas around Beijing, 165 samples of 65 typical profiles and detailed information about profiles and corresponding environments were collected. The results indicate that the average content of soil organic carbon is (12.61±9.58)g/kg. We found a positive correlation between surface soil organic matter content, altitude and vegetation coverage, and a negative correlation between surface soil organic matter content and humidity. It can be clearly seen that hydrothermal conditions and vegetation caused by altitude are the dominant environmental factors impacting on surface soil organic matter content. Soil organic matter content decreases quickly from the surface to subsurface horizon with the value of 44.48%, and slowly under the subsurface horizon with all the value less than 20%. Decreasing rates vary under coniferous forest (10.15%), meadow (18.75%), deciduous broad leaved forest (19.12%), xerophytic forest-grass (31.65%), xerophytic forest-shrub (64.09%) (in ascending order). Usually, soil organic matter content under meadow coverage is higher and decreases much slower from the surface to subsurface horizon than for forest coverage. Furthermore, 47 soil profiles at lower altitude (under 800m) revealed that the average content and variability of organic carbon in farming soil is less than that of natural soil. The variability degree of grassland is the strongest while organic carbon of garden plots is the lowest. In view of mountainous soil's vulnerability and its importance to ecological protection, we should adjust measures to local conditions during development and utilization. |
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| Keywords: | Mountainous area Soil organic carbon Distribution Impact factors Beijing |
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