不同农业土地利用年限干旱区土壤剖面碳存储动态变化

干旱区农业土地开发利用对土壤碳库的源汇效应一直存有争议,为研究该过程对土壤剖面碳存储作用,该文以新疆三工河流域阜北农场不同土地开发利用时段的农田为研究对象,对比分析近50 a 0-200 cm土壤剖面有机碳和无机碳分布格局及其变化。结果表明:土壤碳含量随利用年限增加而增大,但有机碳与无机碳变化趋势相反;长期的农业土地利用显著影响0-80 cm土壤碳的分布,其变异性在80-100 cm有明显的突变现象,即变异系数均减小40%以上;无机碳与有机碳的比例随土层深度和利用年限增加,变化率从荒地的0.028到50 a的0.088(P〈0.01),增幅达2.14倍;随土地利用年限,有机碳和无机碳的碳储效应...

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Published in农业工程学报 Vol. 33; no. 19; pp. 287 - 294
Main Author 雒琼 王玉刚 邓彩云 牛子儒 李彦
Format Journal Article
LanguageChinese
Published 中国科学院阜康荒漠生态系统国家野外科学观测站,阜康 831505 2017
中国科学院大学,北京 100049%中国科学院新疆生态与地理研究所,荒漠与绿洲生态国家重点实验室,乌鲁木齐 830011
中国科学院新疆生态与地理研究所,荒漠与绿洲生态国家重点实验室,乌鲁木齐 830011
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ISSN1002-6819
DOI10.11975/j.issn.1002-6819.2017.19.037

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Summary:干旱区农业土地开发利用对土壤碳库的源汇效应一直存有争议,为研究该过程对土壤剖面碳存储作用,该文以新疆三工河流域阜北农场不同土地开发利用时段的农田为研究对象,对比分析近50 a 0-200 cm土壤剖面有机碳和无机碳分布格局及其变化。结果表明:土壤碳含量随利用年限增加而增大,但有机碳与无机碳变化趋势相反;长期的农业土地利用显著影响0-80 cm土壤碳的分布,其变异性在80-100 cm有明显的突变现象,即变异系数均减小40%以上;无机碳与有机碳的比例随土层深度和利用年限增加,变化率从荒地的0.028到50 a的0.088(P〈0.01),增幅达2.14倍;随土地利用年限,有机碳和无机碳的碳储效应在土层间与时间尺度上不同,但剖面土壤碳密度为典型的碳汇进程。研究可为干旱区农业土地开发提供依据。
Bibliography:11-2047/S
land use; soils; organic carbon; inorganic carbon; carbon accumulation; variation
The impact of agricultural land use on soil carbon storage is one of the international scientific focuses in climate-change mitigation. Aimed to understand the effect of agricultural land development and utilization on soil carbon storage, a study was conducted in different period of farmland at the Fubei Farm of Sangong River Basin in Xinjiang, northwest of China (87°49′-88°16′E, 43°50′-44°22′N). The agricultural lands were selected within different land use years such as 1, 5, 15, 30 and 50 a in the studied area, and the wasteland with little disturbance was selected as a reference land in the same soil type and near position of cropland. Soil samples from these sites were obtained by handy soil auger at 20 cm intervals in a depth of 200 cm and analyzed in the laboratory. Samples were air-dried and crushed to pass through a 2-mm mesh. The patterns of soil carbon storage and its dynamic change were analyzed and compared
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2017.19.037