The results indicated that the semivariogram of total C , available N and available K were best described by the Gaussian model, while available P was best fitted by the Spherical model.
结果表明，海伦黑土全碳、碱解氮和速效钾半变量函数曲线的理论模型符合高斯模型，速效磷的理论最佳模型为球状模型。
The spatial variability of organic matter, available N, and available K was mainly caused by structural factors and that of available P was primarily caused by random factors.
有机质、水解氮和速效钾的空间变异主要是由结构性因素引起的，速效磷的空间变异是由随机因素引起的。
Trace elements fertilizer is rarely used in this region which leading to a decrease on the content of soil available iron, available Manganese, and available copper.
当地农户施用微量元素肥料很少，造成土壤有效铁、有效锰和有效铜含量的下降。
Start with setting the concept of available water resources, this paper puts forward the calculation matheds for available surface water resources and total available water res.
指出洪水资源利用评价应解决洪水资源量计算、洪水资源利用水平分析、洪水资源可利用量评价和洪水资源利用潜力评估四个基本问题。
Start with setting the concept of available water resources, this paper puts forward the calculation matheds for available surface water resources and total available water res.
指出洪水资源利用评价应解决洪水资源量计算、洪水资源利用水平分析、洪水资源可利用量评价和洪水资源利用潜力评估四个基本问题。
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