中国科学院机构知识库网格系统: 检索

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天文学 6	Physics 4	天文学::天体物理学 4
天文学::天体物理学::实测天体物理学 4	Ecology 3	天文学::天文学其他学科 3
Biochemistry & Molecular Biology 1	Biodiversity Conservation 1	Evolutionary Biology 1
Genetics & Heredity 1	This paper presents a study on species diversity and its ecological service function in the plateau area in western Sichuan. The results show that species diversity in the plantations on the cutover land has a tendency to increase and that its ecological service function is to be improved with stand age growing. The species diversity in forest communities is also gradually increased on different succession stage till reaching a climax level. But the species diversity in the climax community is slightly decreased before it reaches a relatively constant status. Ecological service function of diversity is gradually strengthened with the progress of succession. In addition, species diversity in a stand in a similar site and at a same age differs among forest types. Species diversity index within a coniferous and broad-leaved mixed forest is larger than that within a coniferous forest. Meanwhile, species diversity enriches as the tree density increases 1	optics 1
天文学::射电天文学 1	天文学::射电天文学::射电天体物理学 1	植物生态学 1

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