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The Nutrient Content Variations of Different Forest Species and the Forest Soil in Loess Region of Western Shanxi Econom ic Va lue Assessment of Forest Spec ies D iversity Conserva tionin China Ba sed on the Shannon-W iener Index The response on dark respiration of some tropical rain forest and coastal desert plant species to the elevation of CO 2 concentrations Species structure of natural secondary forest in the Wudaohe farm Acclimation of Lamina Mass Per Unit Area, Photosynthetic Characteristics and Dark Respiration to Growth Light Regimes in Four Tropical Rainforest Species