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天文学 64 天文学::天体物理学 41 天文学::天体物理学::高能天体物理学 40
核科学技术 30 Chemistry 12 农作物 12
材料科学与物理化学 11 Physics 10 Plant Sciences 9
Materials Science 8 Science & Technology - Other Topics 8 物理学 8
Biochemistry & Molecular Biology 7 Cell Biology 7 Pharmacology & Pharmacy 7
光电子学 7 plant sciences 6 Microbiology 5
Multidisciplinary Sciences 5 园艺 5 物理化学 5
Immunology 4 Mycology 4 农学(农艺学) 4
天文学::天文学其他学科 4 天文学::星系与宇宙学 4 畜牧、动物医学、狩猎、蚕、蜂 4
Geology 3 agriculture, multidisciplinary 3 半导体物理 3
环境地质学 3 Biotechnology & Applied Microbiology 2 Chemistry, Multidisciplinary 2
Chemistry, Organic 2 Ecology 2 Energy & Fuels 2
Environmental Sciences 2 Fisheries 2 Geosciences, Multidisciplinary 2
Marine & Freshwater Biology 2 Physical Geography 2 Research & Experimental Medicine 2
Veterinary Sciences 2 biotechnology & applied microbiology 2 microbiology 2
optical devices and systems 2 分子生物学 2 天文学::天体测量学 2
天文学::射电天文学 2 天文学::恒星与银河系 2 有机化学 2
植物保护 2 物理学::高能物理学 2 遗传学 2
Abnormal psychology 1 Agriculture 1 Anatomy & Morphology 1
Astronomy & Astrophysics 1 Astrophysics 1 Atmospheric Properties; Nickel; Lasers, General; Chemical Products Generally; Plasma Physics 1
Biochemical Research Methods 1 Biochemistry & Molecular Biology; Biophysics 1 Biochemistry & Molecular Biology; Plant Sciences 1
Biodiversity Conservation 1 COLOR CALIBRATION 1 Cell Biology; Geriatrics & Gerontology 1
Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter 1 Cost functions - Geometry 1 Data processing - Semantics 1
Diffraction gratings - Electrical engineering - Magnetic materials 1 Ecology; Limnology 1 Electrochemistry 1
Engineering 1 Environmental Sciences & Ecology 1 Evolutionary Biology 1
Genetics & Heredity 1 Geography, Physical 1 Geriatrics & Gerontology; Pharmacology & Pharmacy; Gastroenterology & Hepatology; Pathology; Hematology 1
Geriatrics & Gerontology; Surgery; Respiratory System; Oncology 1 Information filtering - Object recognition 1 Integrative & Complementary Medicine 1
Life Sciences & Biomedicine - Other Topics 1 Materials Science; Physics 1 Mathematics; Pharmacology & Pharmacy; Plant Sciences; Biochemistry & Molecular Biology 1
Meteorology & Atmospheric Sciences 1 Neurosciences & Neurology 1 Nuclear Science & Technology 1
Oncology 1 Optical engineering 1 Pathology; Demography; Pediatrics 1
Pediatrics; Pharmacology & Pharmacy; Cardiovascular System & Cardiology; Urology & Nephrology 1 Pharmacology & Pharmacy (Provided By Clarivate Analytics) 1 Pharmacology & Pharmacy; Cell Biology; Medical Laboratory Technology; Plant Sciences 1
Pharmacology & Pharmacy; Urology & Nephrology; Toxicology; Cardiovascular System & Cardiology; Reproductive Biology 1 Physics, Applied 1 Science & Technology - Other Topics; Developmental Biology 1
Soil Mechanics and Foundations; Soils and Soil Mechanics; Seismology; Light/Optics; Physical Chemistry; Mathematics 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; Cell Biology; Biochemistry & Molecular Biology; Pharmacology & Pharmacy; Reproductive Biology 1
Virology 1

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