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研究黄土高原地区撂荒地土壤全磷的空间变异,可为该地区植被自然恢复措施的持续实施提供理论指导。本文通过2 m×2 m小网格布置了49个采样点,利用经典统计和地统计学方法研究分析了地面以下4个深度土壤全磷的空间异质性规律。结果表明:(1)表层(0~10 cm)全磷含量水平为0.44 g kg-1,显著高于其它3个深度,且土壤全磷在每个深度层均为中等程度变异;(2)土壤全磷含量水平与其方差的正相关关系在土壤表层最显著(P<0.05);(3)土壤全磷在0~10 cm和30~40 cm深度范围呈现中等空间依赖性,在10~20 cm与20~30 cm呈现强烈空间依赖性;(4)土壤全磷在各深度的空间分布插值图显示,表层土壤全磷的空间分布与下层差异较大,10~20 cm与20~30 cm土壤全磷的空间分布具有高度的相似性。
Studying the spatial variability of soil total phosphorus in abandoned land in the Loess Plateau can provide theoretical guidance for the sustainable implementation of the natural restoration measures in the area. In this paper, 49 sampling points are arranged by 2 m × 2 m grids, and the spatial heterogeneity of soil total phosphorus in four depths below the ground is studied by using classical statistics and geostatistics. The results showed that: (1) Total phosphorus content in the surface layer (0 ~ 10 cm) was 0.44 g kg-1, significantly higher than the other three depths, and soil total phosphorus was moderately variable in each depth layer; (2) The positive correlation between soil total phosphorus and its variance was the most significant in the soil surface (P <0.05). (3) The soil P was moderately spatial dependent in the depth of 0-10 cm and 30-40 cm, cm and 20-30 cm. (4) The spatial distribution of total P in the soil showed that the spatial distribution of total P in the topsoil differed greatly from that in the lower layer. The spatial distribution of total P in the topsoil ranged from 10 to 20 cm and from 20 to 30 cm The spatial distribution of soil total phosphorus has a high degree of similarity.