DEM栅格分辨率对多元线性土壤—景观模型及其制图应用的影响
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国家自然科学基金项目(40401024、40501056);江苏省自然科学基金项目(BK2006526)资助


EFFECTS OF DEM RESOLUTION ON MULTI-FACTOR LINEAR SOIL-LANDSCAPE MODELS AND THEIR APPLICATION IN PREDICTIVE SOIL MAPPING
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    摘要:

    以亚热带丘陵地区为对象,以该区4 km×3 km的5 m、10 m、15 m、20 m、25 m、30 m数字高程模型(DEM)为基础,建立多元线性土壤-景观模型,并应用该模型预测研究区内土壤表层有机质含量分布,进而比较不同分辨率DEM中土壤-景观模型及其预测制图的精度。结果表明:在本研究区11 km2范围内,随着DEM栅格分辨率降低,坡度、曲率、比汇水面积(对数)频度均表现出了向其中值区集中的趋势;地形因子的这一变化规律对土壤-景观模型的影响较小,例如模型的变量、变量系数及R2在不同分辨率DEM中的差异很小;但地形因子的这一变化规律对模型预测制图的精度具有较大影响,各项指标均说明,模型在10~25 m DEM中的制图精度较高,而在更高分辨率(5 m)或更低分辨率(30 m)DEM中较低。本研究结果对其他亚热带丘陵地区具有一定的指示意义。

    Abstract:

    In order to investigate effects of DEM resolution on soil-landscape models and their application in predictive soil mapping,multi-factor linear soil-landscape models were built up based on DEMs,varying in resolution,5 m,10 m, 15 m,20 m,25 m,and 30 m,of the studied zone(4 km×3 km)a typical subtropical hilly area,and then applied to predictive mapping of organic matter content in top soil.Results indicated,slope,curvatures,natural logarithm of specific catchment area tended to concentrate with the decrease in DEM resolution.The variation of terrain attributes didn't affect much on the simulation coefficients of the models,but it did accuracy of the models in predictive mapping.All the indexes demonstrate that the model was higher in mapping accuracy when the DEM resolution was 10~25 m than when it was others. The findings may be extrapolated to other subtropical hilly areas.

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孙孝林,赵玉国,秦承志,李德成,赵量,张甘霖. DEM栅格分辨率对多元线性土壤—景观模型及其制图应用的影响[J].土壤学报,2008,45(5):971-977. DOI:trxb10.11766/200705040524 Sun Xiaolin, Zhao Yuguo, Qin Chengzhi, Li Decheng, Zhao Liang, Zhang Ganlin. EFFECTS OF DEM RESOLUTION ON MULTI-FACTOR LINEAR SOIL-LANDSCAPE MODELS AND THEIR APPLICATION IN PREDICTIVE SOIL MAPPING[J]. Acta Pedologica Sinica,2008,45(5):971-977.

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  • 收稿日期:2007-05-04
  • 最后修改日期:2007-07-16
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  • 在线发布日期: 2013-05-10
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