三門峽煙區(qū)土壤pH 時(shí)空變異特征
Temporal and Spatial Variability of Soil pH in Sanmenxia Tobacco Area
-
摘要: 利用地統(tǒng)計(jì)學(xué)方法結(jié)合GIS 空間分析技術(shù),，對(duì)三門峽煙區(qū)土壤耕層（0～20 cm）pH 時(shí)間和空間變異特征進(jìn)行了研究。結(jié)果表明,，三門峽煙區(qū)pH 在6.5～8.8 之間變動(dòng),，能夠滿足優(yōu)質(zhì)煙生產(chǎn)需要，但局部地區(qū)pH 較高,。pH 服從對(duì)數(shù)正態(tài)分布,，2002 和2007 年變異系數(shù)分別為15.2%和4.5%，變異函數(shù)的最佳理論模型為指數(shù)模型,。土壤pH 具有強(qiáng)烈的空間相關(guān)性,，2002 和2007 年的變程分別為55.77 km 和92.39 km。采用Kriging 最優(yōu)內(nèi)插法得到三門峽煙區(qū)2002 和2007 年土壤pH空間分布圖和差異圖,，并分析了土壤pH 升高的原因和土壤改良措施,。Abstract: Geostatistics with GIS spatial technology was applied to analyze the temporal and spatial variability of pH in top soil (0-20 cm) for tobacco planting region in Sanmenxia, Henan province. The results indicated that soil pH value ranged form 6.5 to 8.8 and met the requirement to produce high quality tobacco leave, but the pH value in some locations was a little high. The distribution of pH value was logarithm normal distribution, its variance coefficient was 15.2% and 4.5% for 2002 and 2007, respectively. The semivariogram of pH could be best described by the exponential model and spatial heterogeneity of pH was 55.77 km and 92.39 km. The Kriging interpolation method was applied to calculate the unobserved points and was used to generate the spatial and discrepancy map. The reasons that soil pH increased were analyzed and the strategies for soil improvement were also proposed.
下載: