基于多种土壤养分的精准管理分区方法研究
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* 国家自然科学基金项目(40471093,40571118)资助


SOIL NUTRIENTS-BASED ZONING FOR MANAGEMENT OF PRECISION AGRICULTURE
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    摘要:

    根据土壤养分的空间变异性和空间自相关性进行管理分区的划分是精准农业实施变量施肥管理的重要环节。本研究首先分析了3种主要土壤养分的空间变异特征和空间自相关性,碱解氮、有效磷、速效钾在空间上均达到了中等强度的变异,但仅有碱解氮和有效磷具有中等强度的空间自相关性,而速效钾在本研究采样尺度下则表现为纯块金效应,不具有空间自相关性;与各向同性相比,碱解氮在各向异性条件下克里金插值精度提高了42.8%。以空间上既存在变异又具有空间相关性的有效磷、碱解氮两种土壤养分为数据源,利用模糊K-均值聚类算法将整个地块划分为不同的管理分区,并引入模糊效果指数(PFI)和标准化分类熵(MPE)两个指标确定适宜的分区数为4个。最后,为了评价分区结果的合理性,对各管理分区进行了统计,并用LSD法进行了各分区间差异显著性检验。结果表明:各管理分区内的碱解氮的变异系数由整个地块的13.2%减小到3.0%~5.3%,趋于同质性;有效磷的变异系数由整个地块的44.3%减小到10.1%~17.2%,也得到了大幅度的减少;而且不同分区之间各养分均达到了显著差异。

    Abstract:

    Zoning based on spatial variability and spatial autocorrelation of soil nutritions on a field scale,is a key to variable-rate fertilization in precision agriculture.First of all,spatial variability and spatial autocorrelation of three main soil nutrients were analyzed.The variation coefficient of available P,alkalytic N and available K was 44.3% ,13.2% and 34.3% ,respectively.Available P and alkalytic N demonstrate medium spatial autocorrelation,but available K did not show any on the sampling scale.Precision of the Kriging interpolation of alkalytic N was improved by 42.8% considering anisotropy of spatial variability. Secondly,fuzzy-K-means cluster analysis of interpolated soil distribution maps was conducted to delineate management zones based on available P and alkalytic N.Fuzziness Performance Index(FPI) and Modified Partition Entropy(MPE) were employed to determine optimal zone number.The whole field was divided into four management zones.Finally,the zoning statistics showed that variation coefficient of alkalytic N and available P within a zone decreased from 13.2% on the field scale to 3.0%~5.3% , from 44.3% to 10.1%~17.3% ,respectively,while the means of the soil nutrients differed sharply between management zones.

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李翔,潘瑜春,马景宇,赵春江,王纪华.基于多种土壤养分的精准管理分区方法研究[J].土壤学报,2007,44(1):14-20. DOI:10.11766/trxb200508150103 Li Xiang, Pan Yuchun, Ma Jingyu, Zhao Chunjiang, Wang Jihua. SOIL NUTRIENTS-BASED ZONING FOR MANAGEMENT OF PRECISION AGRICULTURE[J]. Acta Pedologica Sinica,2007,44(1):14-20.

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  • 收稿日期:2005-08-15
  • 最后修改日期:2006-03-20
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  • 在线发布日期: 2013-02-25
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