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天文学 13 天文学::天体物理学 6 Physics 5
Plant Sciences 5 Chemistry 4 Pharmacology & Pharmacy 4
天文学::天体物理学::实测天体物理学 4 Ecology 3 农作物 3
天文学::天文学其他学科 3 Cell Biology 2 Environmental Sciences 2
Medicinal 2 Multidisciplinary Sciences 2 Science & Technology - Other Topics 2
农业基础科学 2 天文学::天体测量学 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 岩石学 2 核科学技术 2
物理学 2 931.3 Atomic and Molecular Physics;931.1 Mechanics;813.1 Coating Techniques;813 Coatings and Finishes;804.2 Inorganic Compounds;933.1.2 Crystal Growth;804.1 Organic Compounds;802.3 Chemical Operations;801.4 Physical Chemistry;712.1 Semiconducting Materials;531.2 Metallography;803 Chemical Agents and Basic Industrial Chemicals 1 Biochemistry & Molecular Biology 1
Biochemistry & Molecular Biology; Chemistry, Multidisciplinary 1 Biodiversity Conservation 1 Biodiversity Conservation; Ecology; Environmental Sciences 1
Biotechnology & Applied Microbiology 1 COLOR CALIBRATION 1 Cell Biology; Pharmacology & Pharmacy; Toxicology 1
Cell Biology; Pharmacology & Pharmacy; Toxicology; Biochemistry & Molecular Biology; Genetics & Heredity 1 Chemistry, Medicinal 1 Chemistry, Multidisciplinary 1
Chemistry, Organic 1 Evolutionary Biology 1 Genetics & Heredity 1
Geosciences, Multidisciplinary 1 Integrative & Complementary Medicine 1 Meteorology & Atmospheric Sciences 1
Pathology; Pediatrics; Geriatrics & Gerontology; Anthropology; Biochemistry & Molecular Biology; Genetics & Heredity; Oncology 1 Pediatrics; Geriatrics & Gerontology; Genetics & Heredity; Anthropology; Biochemistry & Molecular Biology; Oncology 1 Pediatrics; Geriatrics & Gerontology; Genetics & Heredity; Oncology; Biochemistry & Molecular Biology 1
Pediatrics; Pharmacology & Pharmacy; Cardiovascular System & Cardiology; Urology & Nephrology 1 Pharmacology & Pharmacy; Urology & Nephrology; Toxicology; Cardiovascular System & Cardiology; Reproductive Biology 1 Pharmacology & Pharmacy; Virology 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 agriculture, multidisciplinary 1 chemistry, applied 1
food science & technology 1 optics 1 science & technology - other topics 1
分析化学与药物化学 1 半导体物理 1 园艺 1
天文学::射电天文学::射电天文方法 1 天文学::星系与宇宙学 1 材料科学 1
材料科学与物理化学 1 植物生态学 1 火成岩岩石学 1
环境地质学 1 矿床地质 1 矿床学 1
行业污染、废物处理与综合利用 1

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