荒漠化重建地区土壤有机碳动态研究
Dynamic Analysis of Soil Organic Carbon in Desertification Rebuilding Area
查看参考文献9篇
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文摘
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土壤有机碳(Soil organic carbon，SOC)是反映土地荒漠化的重要指标。本研究以陕西省榆林市为例，开展小区域沙漠化重建地区SOC动态的实证研究。SOC数据来源于1982年土壤普查和2003年重复采样，土样的采集、分析和统计方法分别为土钻取土法、重铬酸钾氧化法、吸管法和面积加权法。研究结果表明：SOC含量与粗砂粒显著负相关(R=-0．50，a＝0．01)，与粘粒显著正相关(R=-0．45，a＝0．05)，20年间土壤颗粒细化趋势比较明显；20年间原始剖面、1 m深和耕层SOC含量、密度和储量都有不同程度的增加，其中对人类活动最敏感的耕层土壤变化最显著，SOC含量、密度和储量分别增加了0．55 g／kg，0．15 kg／m~2，10．07 GgC。该研究结果表明防风固沙、可持续性农耕等措施会卓有成效地促进土地沙漠化的恢复和重建。 |
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其他语种文摘
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Soil organic carbon (SOC) is an important indicator to measure the land desertification. Yulin city is taken as a case to study the SOC dynamics of desertification rebuilding area in a local scale. The data source based on the second soil survey in year of 1982 and repeated soil sampling in year of 2003, and the methods for sam pling, determining and analyzing of SOC are auger hole method, K_2Cr_2O_7 oxidation method, area-weigh method respectively, and micro-pipette method is used to determine soil texture. The main conclusions are as follows; SOC content is much correlative to soil texture, it is negative correlation to coarse silt( R = - 0. 50, a = 0. 01) and positive correlation to clay (R = - 0. 45, a = 0. 05) ; The content, density and storage of SOC in original pro file, 1 m depth and arable layer increase greatly during the 20 years, among which the arable layer is most re markable result in direct and indirect mankind activities; The content, density and storage of arable layer SOC are increased by 0. 55 g/kg,0. 15 kg/m~2,10. 07GgC respectively, which representing rate of increase of 21. 00%, 33. 02% ,33. 02% correspondingly. The results show that tree and grass planting, return plantation to woodland or pasture, sustainable agricultural managements and other countermeasures will promote desertification reverse significantly, which will helpful to increase the amount of SOC and carbon sequestration in desertification area. |
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来源
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水土保持学报
,2004,18(3):74-77,89 【核心库】
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关键词
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土地沙漠化
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地址
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1.
中国科学院地理科学与资源研究所, 北京, 100101
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中国科学院研究生院, 北京, 100039
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1009-2242 |
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学科
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农业基础科学 |
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基金
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国家科技部国际合作重点项目
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国家科技部国际合作重点项目
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文献收藏号
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CSCD:1627902
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