| 我国东部土壤有机碳的密度及转化的控制因素 |
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| 引用本文： | 李忠,孙波,林心雄.我国东部土壤有机碳的密度及转化的控制因素[J].地理科学,2001,21(4):301-307. |
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| 作者姓名： | 李忠 孙波 林心雄 |
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| 作者单位： | 中国科学院南京土壤研究所 |
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| 基金项目： | 国家自然科学重大基金资助项目 (3 98993 70 -3 ) |
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| 摘 要： | 根据第二次土壤普查资料，计算了我国东部土壤的有机密度和储量，并通过田间和室内试验的结果，分析了影响农田土壤中有机碳转化的因素。结果表明，我国东北地区土壤有机碳密度变幅为2．5－73．3kg C/m^2，平均值为10．5kg C/m^2，而在东南热带亚热带地区，剖面土壤有机碳密度变幅为3．9－16．7kg C/m^2，平均值为9．52％kg C/m^2。随着木质素含量和土壤粘粒含量的增加，植物物质的分速率下降，而土壤温度，pH和游离碳酸钙含量的增加促进了 植物物质的分解；淹水的水田中植物物质的分解速率通常低于旱地；土壤性质和有机物组成对植物物质分解的影响可以掩盖气候条件的影响，而土壤游离碳酸钙可以掩盖土壤质地的影响。
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| 关 键 词： | 中国东部 土壤有机碳 密度 转化 控制因素 木质素 土壤粘粒含量 土壤温度 |
| 文章编号： | 1000-0690(2001)04-0301-07 |
Density of Soil Organic Carbon and the Factors Controlling Its Turnover in East China |
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| LI Zhong,SUN Bo,LIN Xin xiong.Density of Soil Organic Carbon and the Factors Controlling Its Turnover in East China[J].Scientia Geographica Sinica,2001,21(4):301-307. |
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| Authors: | LI Zhong SUN Bo LIN Xin xiong |
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| Abstract: | Based on the soil species data from the Second National Soil Survey, the soil organic C (SOC) density and stocks in East China were calculated, and the influnce factors of SOC turnover in cultivated soils were investigated by field and laboratory experiments. The results show that the SOC densities to the profile depth in Northeast China varied from 2.5 to 73.3 kg C/m 2 with a mean value of 10.5 kg C/m 2. In southeast tropical and subtropical China, the mean SOC densities to the profile depth ranged from 3.9-16.7 kg C/m 2 with a mean value of 9.52 kg C/m 2. With the increase of lignin content in plant materails and soil clay content, the decompostion rate of plant materails decreased in the cultivated soils. However, the increase of soil temperature, pH and CaCO 3 content promoted the decompostion of plant materails. For the same soil, plant materails decomposed faster in upland soils then in waterlogged paddy soils. The effect of climate conditions on the decomposition of plant materials could be sheltered by the comprehensive influnce of the compositon of plant materials and soil pH, and the effect of soil texiture disappeared with the occurrenceof soil free CaCO 3. |
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| Keywords: | East China Soil organic carbon Density Turnover Controlling factors |
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