徐淮黄泛平原土壤有机质空间变异特征及主控因素分析
Spatial variability of soil organic matter and its dominating factors in Xu-Huai alluvial plain
查看参考文献35篇
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文摘
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土壤有机质含量是估算土壤碳储量、评价土壤肥力和质量的重要指标，精确估算土壤有机质含量具有重要意义。本研究在徐淮黄泛冲积平原西北部选取了一个24 km× 24 km方形区域为研究区，按照套合采样方法，采集了168个耕作层土样，测定分析土壤有机质含量和机械组成，运用地统计学方法和GIS技术研究了徐淮黄泛平原区表层土壤有机质含量的空间变异特征，利用方差分析和回归分析定量分析了区域内土壤有机质空间变异的影响因素。统计结果表明，研究区土壤有机质含量为21.80±7.43 g kg~(-1)，属中等水平，变异系数为34.08%，属中等变异强度；地统计分析表明，研究区具有强烈的空间自相关性，结构变异占主导作用，各向异性显著，在45°方向上变异程度最剧烈，土壤有机质呈条带状分布，自东北向西南呈递减趋势；方差分析和逐步回归分析表明，土壤机械组成是研究区土壤有机质空间变异的主控因素，能够独立解释空间变异的64.9%，其次是土地利用、成土母质、土壤类型，四个因子对土壤有机质空间变异的综合解释为74.6%。 |
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其他语种文摘
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In an agricultural ecosystem, soil organic matter (SOM) is an index key to estimating soil C sequestration, soil fertility and quality, etc. Estimation of these soil properties at an acceptable level of accuracy is very important. In this research, a square area (116°45′32″~117°2′14″E，34°31′12″~34°45′6″N), about 580 km~2, was chosen as an example in the northwest of the Xu-Huai alluvial plain (Xuzhou and Huaiyin). A total of 168 soil samples were collected according to nested scenario’s, for analysis of SOM content and soil texture. And furthermore, spatial variability of SOM in the surface layer of this region was analyzed using the geostatistics and GIS method, and its dominating factors, too, by means of variance analysis and regression analysis. Descriptive statistics of the results shows that the SOM content of the region varying in the range of 21.80 ± 7.43 g kg~(-1) with a variation coefficient being 34.08%, both belonging to a moderate level. Geostatistical analysis suggests that the study area was very strong in spatial autocorrelation and structural factors played a dominating role in spatial variability of SOM, which was significant in anisotropy. The variation at 45° in direction was the most severe. SOM in the area was distributed in a band, decreasing from northeast to southwest. Variance analysis and stepwise regression analysis indicates that mechanical composition of the soil was the dominating factor, which alone could explain 64.9% of the SOM spatial variability of the region, and land use, parent material and soil type followed in role. The four factors together could explain 74.6% of the variability of SOM in the study area |
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来源
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土壤学报
,2013,50(1):1-11 【核心库】
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关键词
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土壤有机质
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空间变异
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影响因素
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地统计学
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逐步回归
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地址
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中国科学院南京土壤研究所, 土壤与农业可持续发展国家重点实验室, 南京, 210008
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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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0564-3929 |
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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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江苏省自然科学基金
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国家科技部国际合作项目
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中国科学院战略性先导科技专项
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文献收藏号
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CSCD:4751995
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