陕北黄土高原小流域土壤有效铜分布特征

对黄土丘陵沟壑区不同密度的刺槐林、榆树林、油松林、侧柏林、油松刺槐混交林等林下草本层物种组成及多样性进行了研究,目的是为人工林生态功能恢复评价和植被建设提供理论依据。研究结果表明,该区林下草本植物共有36种,多以阳性植物为主;由于林分树种组成和密度不同,林下草本物种差异较大;林下植被演替大多处于植被演替初级阶段,针阔混交林在物种数量和建种群落上表现最好,其次是油松纯林和刺槐纯林,榆树纯林生境条件最差;无论是丰富度指数还是多样性和均匀度指数,针阔混交林表现最好,其次为刺槐、油松纯林,表现最差的为榆树、侧柏纯林。

Distribution Characteristics of Soil Available Copper in a Small Watershed of North Shaanxi Loess Plateau

In order to provide theoretical basis for evaluations on ecological function rehabilitation and vegetation development,the herbaceous structure and diversity of the artificial forests were analyzed in the hill and gully region of the Western Shanxi Province.In this study,vegetation of various densities,including Robinia pseudoacacia,Ulmus pumila,Pinus tabulaeformis,Platycladus orientalis,Pinus tabulaeformis and Robinia pseudoacacia mixed forests,were investigated.Thirty-six herbaceous species,of which most ...