| 中国东南地区两土链土壤中土壤性质和水稻产量的空间变异研究 |
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| 作者姓名： | B. R&#;TH B. LENNARTZ |
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| 作者单位： | Institute for Land Use, University of Rostock, Justus-von-Liebig- Weg 6, 18059 Rostock （Germany）. |
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| 基金项目： | *1the German Research Foundation (DFG) (No.LE 945/10-1). |
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| 摘 要： | In the light of an increasing demand for staple food, especially rice, in southeast China, investigations on the specific site potential expressed as the relationship between soil and crop yield parameters gain increasing importance. Soil texture and several soil chemical parameters as well as plant properties such as crop height, biomass and grain yield were investigated along two terraced catenas with contrasting soil textures cropped with wet rice. We were aiming at identifying correlative relationships between soil and crop properties. Data were analyzed both statistically and geostatistically on the basis of semivariograms. Statistical analysis indicated a significant influence of the relief position on the spatial distribution of soil texture, total carbon and total nitrogen contents. Significant correlations were found for the catena located in a sandstone area （Catena A） between rice yield and silt as well as total nitrogen content. Corresponding relationships were not detectable for paddy fields that developed from Quaternary clays （Catena B）. As suggested by the nugget to sill ratio, spatial variability of soil texture, total carbon and nitrogen was mainly controlled by intrinsic factors, which might be attributed to the erosional transport of fine soil constituents, indicating the importance of the relief position and slope in soil development even in landscapes that are terraced. The crop parameters exhibited short ranges of influence and about one third of their variability was unexplained. Comparable ranges Of selected crop and soil parameters, found only for Catena A, are indicative of close spatial interactions between rice yield and soil features. Our findings show that especially in sandstone-dominated areas, a site-specific management can contribute to an environmentally safe rice production increase.
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| 关 键 词： | 稻米产量 变量分析 土壤 空间数据 |
Spatial variability of soil properties and rice yield along two catenas in southeast China |
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| B. R&#;TH,B. LENNARTZ.Spatial variability of soil properties and rice yield along two catenas in southeast China[J].Pedosphere,2008,18(4):409-420. |
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| Authors: | B R&#;TH and B LENNARTZ |
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| Institution: | Institute for Land Use, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock (Germany). Email: bjoernrueth@web.de;Institute for Land Use, University of Rostock, Justus-von-Liebig-Weg 6, 18059 Rostock (Germany). Email: bjoernrueth@web.de |
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| Abstract: | In the light of an increasing demand for staple food, especially rice, in southeast China, investigations on the specific site potential expressed as the relationship between soil and crop yield parameters gain increasing importance. Soil texture and several soil chemical parameters as well as plant properties such as crop height, biomass and grain yield were investigated along two terraced catenas with contrasting soil textures cropped with wet rice. We were aiming at identifying correlative relationships between soil and crop properties. Data were analyzed both statistically and geostatistically on the basis of semivariograms. Statistical analysis indicated a significant influence of the relief position on the spatial distribution of soil texture, total carbon and total nitrogen contents. Significant correlations were found for the catena located in a sandstone area (Catena A) between rice yield and silt as well as total nitrogen content. Corresponding relationships were not detectable for paddy fields that developed from Quaternary clays (Catena B). As suggested by the nugget to sill ratio,spatial variability of soil texture, total carbon and nitrogen was mainly controlled by intrinsic factors, which might be attributed to the erosional transport of fine soil constituents, indicating the importance of the relief position and slope in soil development even in landscapes that are terraced. The crop parameters exhibited short ranges of influence and about one third of their variability was unexplained. Comparable ranges of selected crop and soil parameters, found only for Catena A, are indicative of close spatial interactions between rice yield and soil features. Our findings show that especially in sandstone-dominated areas, a site-specific management can contribute to an environmentally safe rice production increase. |
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| Keywords: | rice productivity semivariogram analysis soil properties spatial data |
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