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Heterogeneity and stability of the agricultural landscape is the premise to maintain the stable and high efficient agricultural ecosystem. Currently, habitat loss and the changes of landscape structure caused by human activities have become the important reason for the loss of biodiversity of the agricultural landscape. Although there are numerous metrics available to investigate the spatial structure of landscape, only little empirical research has examined these metrics to indicate the plant species diversity at several scales. The study area is in Gongyi city which is distributed in the mountainous and hilly areas of Middle鄄Lower Yellow River. We select three types of habitat, such as shrub, plantation and farmland edge to investigate plant species by the typical sample method. These three types of habitat also represent three different disturbance levels. Shrub corresponds to the natural habitat, plantation is under semi鄄Natural habitat, and the farmland

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Human鄄driven ecosystem simplification has highlighted questions about how the number of species in an ecosystem influences its functioning. Biodiversity is now known to affect ecosystem productivity and stability of the ecosystem. In this study, different vegetation types in Ruyang County, Henan Province, China, were examined to evaluate the impact of large鄄scale planting of Eucommia ulmoides on local species diversity. The species diversity was analyzed using Shannon鄄Wiener diversity ( H) , Simpson diversity ( D) , and evenness ( J H 忆) indices in three different vegetation types:Eucommia ulmoides plantation, temperate fallen broad鄄leaved forest ( referred to as secondary forest) , and abandoned land ( old field) . The results indicated that there were 82 species belonging to 39 families and 63 genera in the Eucommia ulmoides forest, in which the herbaceous layer was the most developed. The secondary forest contained 70 species belonging to 32 families and 62 genera, and the tree layer was more developed than more developed than the herbaceous and shrub layers. The old field included 84 species of 35 families and 69 genera but lacked a tree layer. The richness and abundance of species in the Eucommia ulmoides forest were similar to those in the secondary forest and old field, whereas the richness and abundance of species in the herbaceous layer of the Eucommia ulmoides forest were higher than those in the secondary forest.Our results showed that the H, D, and J H indices of the three layers of the Eucommia ulmoides forest were not significantly different from those of the secondary forest and old field ( P > 0. 05) . Collectively, these results illustrate that, with a