| 陕西省农田土壤硫含量空间变异特征及亏缺评价 |
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| 引用本文： | 高义民,同延安,胡正义,孙本华,王彩绒.陕西省农田土壤硫含量空间变异特征及亏缺评价[J].土壤学报,2004,41(6):938-944. |
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| 作者姓名： | 高义民 同延安 胡正义 孙本华 王彩绒 |
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| 作者单位： | 1. 西北农林科技大学资源环境学院,陕西,杨凌,712100
2. 土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京,210008 |
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| 基金项目： | 国际硫研究所(TSI)资助 |
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| 摘 要： | 陕西省 13种耕地土壤 30 5个表层 (0～ 2 0cm)土壤样点分析结果表明 :该省土壤全硫和用0 0 1molL-1Ca(H2 PO4) 2 浸提的有效硫含量分别为 33～ 76 9mgkg-1(均值 36 0mgkg-1)和 4 6～ 15 7 3mgkg-1(均值 2 9 3mgkg-1) ,其中黑垆土 (普通干润均腐土 )、绵砂土 (灌淤湿润砂质新成土 )的有效硫平均含量最低。土壤全硫具有中等空间相关性 ,有效硫空间相关性较差。土壤全硫和有效硫分布具有渐变性 ,其最大相关距离分别为 5 31km和 34km。全硫以较大区域变异为主 ;有效硫以小区域变异为特征。陕西省耕地土壤有效硫含量低于硫亏缺临界值 (18 5mgkg-1)的占总面积的 13 9% ,相当于 5 3 7万hm2 农田缺硫。陕西省中部地区 ,尤其是延安西部地区土壤硫亏缺风险较大
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| 关 键 词： | 陕西省 农田土壤 土壤硫 空间变异性 地统计学 |
| 收稿时间： | 2003/10/13 0:00:00 |
| 修稿时间： | 2004/2/25 0:00:00 |
SPATIAL VARIABILITY OF SOIL SULPHUR AND RISK ASSESSMENT OF SOIL SULPHUR DEFICIENCY IN SHAANXI PROVINCE |
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| Gao Yimin,Tong Yan''an,Hu Zhengyi,Sun Benhua and Wang Cairong.SPATIAL VARIABILITY OF SOIL SULPHUR AND RISK ASSESSMENT OF SOIL SULPHUR DEFICIENCY IN SHAANXI PROVINCE[J].Acta Pedologica Sinica,2004,41(6):938-944. |
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| Authors: | Gao Yimin Tong Yan'an Hu Zhengyi Sun Benhua and Wang Cairong |
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| Institution: | Northwest Science and Technology University of Agriculture and Forest, Yangling, Shaanxi 712100, China;Northwest Science and Technology University of Agriculture and Forest, Yangling, Shaanxi 712100, China;State Key Lab. of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China;Northwest Science and Technology University of Agriculture and Forest, Yangling, Shaanxi 712100, China;Northwest Science and Technology University of Agriculture and Forest, Yangling, Shaanxi 712100, China |
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| Abstract: | Total sulphur and available sulphur in the 305 samples of toplayer soils collected from thirteen main types of soil in Shaanxi Province were extracted by 0.01 mol L-1 Ca(H2PO4)2 and determined.Results indicated that the contents of total sulphur and available sulphur in these soils ranged from 33 to 769 mg kg-1(av.360 mg kg-1) and from 4.6 to 157 mg kg-1(av.29.3 mg kg-1), respectively.Heilutu soil (Cumulic Haplustolls, ST/1996) and Mianshatu soil (Udipsamment, ST/1996) had the lowest content of available sulphur among these soil types.The ranges of spatial correlation was determined through semivariance analysis of these data and were found to be 531 km for soil total sulphur, and 34 km for soil available sulphur, respectively.Spatial variability for soil total sulphur and available sulphur exhibited a gradual changing tendency, and spatial variation developed in large scale for total sulphur, and in small scale for available sulphur.Soil available sulphur in 13.9% of the total land in Shaanxi Province was lower than the critical value, 18.5 mg kg-1, for soil sulphur deficiency, implying approx-imately 0.537 millions hm2 of cultivated land could be sulphur-deficient in this province.In central Shaanxi Province, especially the west part of Yan'an city, the risk of soil sulphur deficiency is great. |
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| Keywords: | Shaanxi Province Cropland soil Soil sulphur Spatial variability Geo-statistics |
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