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astronomy & astrophysics; physics 37 physics 22 Plant Sciences 19
天文学 15 Chemistry 14 Physics 12
Materials Science 10 Biochemistry & Molecular Biology 9 Ecology 9
天文学::天体物理学 7 Electrochemistry 6 Materials Science, Multidisciplinary 6
Pharmacology & Pharmacy 6 Science & Technology - Other Topics 5 天文学::天体物理学::实测天体物理学 5
天文学::星系与宇宙学 5 Geology 4 Physics, Applied 4
天文学::天文学其他学科 4 昆虫学 4 Biotechnology & Applied Microbiology 3
Chemistry, Medicinal 3 Chemistry, Multidisciplinary 3 Chemistry; Polymer Science 3
Energy & Fuels 3 Oceanography 3 Physics, Condensed Matter 3
无机非金属材料 3 植物保护 3 物理化学 3
Agriculture, Multidisciplinary 2 Biodiversity Conservation 2 Biology 2
Biophysics 2 Cell Biology 2 Chemistry, Applied 2
Engineering 2 Engineering, Electrical & Electronic 2 Environmental Sciences 2
Environmental Sciences & Ecology 2 Genetics & Heredity 2 Integrative & Complementary Medicine 2
Metallurgy & Metallurgical Engineering 2 Meteorology & Atmospheric Sciences 2 Multidisciplinary Sciences 2
Physical Geography 2 Water Resources 2 agriculture, multidisciplinary 2
chemistry 2 environmental sciences 2 materials science 2
science & technology - other topics 2 光电子学 2 农学 2
半导体器件 2 天文学::天体物理学::高能天体物理学 2 天文学::射电天文学 2
数理科学和化学 ::非线性光学 2 核科学技术 2 生物学 2
Agriculture, Multidisciplinary; Chemistry, Applied; Food Science & Technology 1 Agronomy 1 Applied 1
Astrophysics 1 Biochemistry & Molecular Biology; Environmental Sciences & Ecology; Evolutionary Biology 1 Chemistry, Applied; Chemistry, Medicinal 1
Chemistry, Organic 1 Chemistry, Physical 1 Communication - Experiments - Quantum communication - Quantum theory - Satellite communication systems 1
Environment 1 Environmental Sciences & Ecology; Genetics & Heredity; Evolutionary Biology 1 Evolutionary Biology 1
Fisheries; Immunology; Marine & Freshwater Biology; Veterinary Sciences 1 Food Science & Technology 1 Forestry 1
Geosciences, Multidisciplinary 1 Horticulture 1 Life Sciences & Biomedicine - Other Topics 1
Limnology 1 Marine & Freshwater Biology 1 Materials Science, Ceramics 1
Medicinal 1 Microbiology 1 Nanoscience & Nanotechnology 1
Neurosciences & Neurology 1 Optics - Physics 1 Paleontology 1
Pediatrics; Cardiovascular System & Cardiology; Nutrition & Dietetics; Public, Environmental & Occupational Health; Demography; Social Issues 1 Pediatrics; Pharmacology & Pharmacy; Cardiovascular System & Cardiology; Urology & Nephrology 1 Pharmacology & Pharmacy; Chemistry 1
Pharmacology & Pharmacy; Urology & Nephrology; Toxicology; Cardiovascular System & Cardiology; Reproductive Biology 1 Plant Sciences; Evolutionary Biology 1 Science & Technology - Other Topics; Cardiovascular System & Cardiology; Oncology; Immunology 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 Toxicology 1 accuracy assessment - channel - communication - frequency analysis - quantum mechanics 1
agronomy 1 chemical operations;mathematics;probability theory;mechanics;electronic structure of solids;physical properties of gases, liquids and solids 1 chemistry, applied 1
chemistry, organic 1

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