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Plant Sciences 20	天文学 16	Physics 15
Biochemistry & Molecular Biology 14	Chemistry 14	Ecology 11
Materials Science 11	Science & Technology - Other Topics 7	天文学::天体物理学 7
Electrochemistry 6	Materials Science, Multidisciplinary 6	Pharmacology & Pharmacy 6
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Cell Biology 4	Engineering 4	Physics, Applied 4
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Chemistry; Polymer Science 3	Energy & Fuels 3	Multidisciplinary Sciences 3
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无机非金属材料 3	物理化学 3	Agriculture, Multidisciplinary 2
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核科学技术 2	生物学 2	Adhesives 1
Agriculture, Multidisciplinary; Chemistry, Applied; Food Science & Technology 1	Agronomy 1	Applied 1
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Pharmacology & Pharmacy; Chemistry 1	Plant Sciences; Evolutionary Biology 1	Research & Experimental Medicine 1
Sodium-ion Batteries 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	chemistry 1	energy & fuels 1
engineering 1	optics 1	半导体材料 1
原子分子物理学 1	图书馆、情报与文献学 1	地球科学::地理学 1
地球科学::地质学 1	大气科学 1	天文和天体物理 1
天文学::射电天文学::射电天体物理学 1