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Physics 10	Biochemistry & Molecular Biology 7	Astronomy & Astrophysics 6
Chemistry 6	Plant Sciences 6	Environmental Sciences 5
Science & Technology - Other Topics 5	物理化学 5	Microbiology 4
天文学 4	Endocrinology & Metabolism 3	Oncology 3
Pharmacology & Pharmacy 3	Cell Biology 2	Engineering 2
Neurosciences & Neurology 2	光电子学 2	半导体材料 2
天文和天体物理 2	天文学::射电天文学 2	Applied 1
Biophysics 1	Chemistry, Organic 1	Ecology 1
Engineering, Biomedical 1	Environmental Sciences & Ecology 1	Gastroenterology & Hepatology 1
Genetics & Heredity 1	Geosciences, Multidisciplinary 1	Imaging Science & Photographic Technology 1
Immunology 1	Marine & Freshwater Biology 1	Materials Science 1
Materials Science, bioMaterials 1	Medicinal 1	Medicine, Research & Experimental 1
Meteorology & Atmospheric Sciences 1	Multidisciplinary 1	Multidisciplinary Sciences 1
Nanophotonics - Nanostructures - Optical devices - Phase modulation 1	Physical Geography; Geology 1	Physics, Applied 1
Remote Sensing 1	Research & Experimental Medicine 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
农学 1	半导体物理 1	天文学::天体物理学 1
天文学::天体物理学::实测天体物理学 1	天文学::太阳与太阳系 1	天文学::太阳与太阳系::太阳物理学 1
天文学::射电天文学::射电天文方法 1	天文学::恒星与银河系 1	有机化学 1
波谱分析 1	生物学 1	生物科学 1
航空、航天科学技术 1