不同尺度下中低山區(qū)植煙土壤氯素空間變異性研究
Spatial Variability of Chlorine in Hilly Tobacco Plantation Soils with Different Sampling Scales
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摘要: 研究植煙土壤氯素的空間變異特征,，可以為山區(qū)煙田土壤養(yǎng)分的精確管理提供理論依據(jù)。以四川會理縣烤煙生產(chǎn)示范基地為研究對象,，采用地統(tǒng)計學方法結(jié)合GIS技術(shù),，對兩個尺度下土壤氯素含量的空間變異性進行了研究。結(jié)果表明：（1）小尺度下,，土壤氯素含量具有中等空間相關性,，空間相關距離為828.5 m, 隨機性和結(jié)構(gòu)性因子對土壤氯素空間變異性影響各占一半；土壤氯素在NE45°方向上變異性較強,；普通Kriging插值表明土壤氯素含量從東北至西南呈片狀分布,，與研究區(qū)域坡度、海拔呈顯著負相關,。（2）微尺度下,，土壤氯素空間相關性弱，表現(xiàn)出純塊金效應,，隨機性因子是影響其空間變異的主要因素,。Abstract: Spatial variability of chlorine in tobacco planting soils was invesitigated to provide theoretical basis for precision management of soil nutrients in hilly areas in Huili, Sichuan Province using geostatistical methods and GIS technique with two sampling scales. In the tobacco plantation at the small scale, the results analyzed by semivariograms indicated that chlorine content was moderately spatially dependent, the range of spatially dependent was 828.5 m, and both structural factors and the random factors equally affected the spatial variability of chlorine content. The results analyzed by anistropic semivariogram indicated that chlorine content had a stronger anisotropic structure in the aspect of NE45°. According to the Ordinary Kriging Method, the equivalence of chlorine content was distributed from northeast to southwest, and the chlorine content was negatively related to slop and elevation of the tobacco plantation. At the micro scale, the results analyzed by semivariograms indicated that the chlorine content showed the pure nugget effect, the spatial variability of chlorine content was fundamentally influenced by the random factors.
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