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本文采取野外大田试验,运用地统计学和经典统计学方法,研究了不同种植年限压砂地的土壤水分空间变异规律。结果表明,压砂地的土壤含水量均值明显大于裸地(CK)的土壤含水量,且新砂地>中砂地>老砂地>裸地。压砂地各土层的变异系数均小于10%,为弱变异。裸地(CK)第Ⅰ层,老砂地Ⅱ、Ⅲ层土壤水分半方差函数最佳理论模型为指数模型,裸地Ⅱ、Ⅲ、Ⅳ层,新砂地第Ⅱ层,中砂地第Ⅰ、Ⅲ、Ⅳ层,老砂地第Ⅰ层为球形模型,其他各地型、各土层均为高斯模型。新砂地具有强烈的空间自相关性,中砂地具有中等的空间自相关性,而裸地和老砂地空间自相关性微弱,变异主要由随机性变异所引起。基于Surfer8.0绘制新砂地各层土壤含水量等值线分布图,结果显示,第Ⅲ层的等值线最密,第Ⅰ层、第Ⅳ层次之,第Ⅱ层最稀疏,这与Cv和C0/(C0+C)得出的结论一致。以期为压砂地生态农业的生产提供理论依据。
In this paper, field experiments were conducted to study the spatial variability of soil moisture under different planting years under the conditions of geostatistics and classical statistics. The results showed that the mean value of soil water content in sandstones was significantly greater than that of bare soil (CK), and that of fresh sand> middle sand> old sand> bare soil. The coefficient of variation of each soil layer in the sand is less than 10%, which is a weak variation. The best theoretical model of soil water half-difference function of the first layer of bare land (CK) and the second and third layer of old sand land are exponential model, bare land Ⅱ, Ⅲ, Ⅳ, new sand land Ⅱ, Ⅳ layer, the first layer of the old sand to the spherical model, the other around the type, the soil is Gaussian model. The new sandland has a strong spatial autocorrelation, and the middle sand has moderate spatial autocorrelation. However, the spatial autocorrelation of the bare sandstone and the old sandstone is weak, and the variation is mainly caused by the random variation. Based on Surfer8.0 map of the soil water content of different layers of the new sand plot, the results show that the third layer of the contours of the most dense, the first layer, the fourth layer, the second layer the most sparse, which Cv and C0 / (C0 + C) reached the conclusion. With a view to provide a theoretical basis for the production of ecologically-intensive sand in the sand.