黄土丘陵区林草景观界面土壤养分分布特征和空间变异性研究

Distribution Characteristics and Spatial Variability of Soil Nutrients at the Forestland-Grassland Interface in Hilly Region of Loess Plateau

通过对泾河流域林草景观界面的土壤养分测定,分析比较界面中养分的分布特征及空间变异性。结果表明:该流域内的土壤养分分布不平衡,除钾素含量(22.977～25.183 g.k-g1)富足外,其他养分含量都很低;林地内养分含量高于草地(有机质含量高16.310%;水解氮含量高19.570%),在界面上养分变化较大,林内和草地内养分变化较小;界面上养分时空差异不明显,而层次之间差异显著。无论是林地还是草地,土壤各养分的变化是确定性变异和随机性变异共同作用的结果,且确定性的变化规律往往控制一定范围内土壤养分的变化和分布。

Based on the determination of soil nutrients in the grassland-forestland interface within the Jing River watershed, comparative analysis of soil nutrients distribution and spatial variability was carried out. The results showed that soil nutrients were unevenly distributed, with most of nutrients inadequate in con- tents except potassium. The soil nutrients in forestland were higher in content than those in grassland, with greater variation of nutrients in the interface but slight variation within grassland or forestland. The soil nutrients variation in spatial and temporal dimensions was insignificant at the interface but significant among the layers. Variation of soil nutrients were the result bought forth by determined variability and random variability, with determined variability governing the nutrients distribution and variation within certain range.