PMID: 19143390Jan 16, 2009Paper

Responses of delta13 C values of plant leaves to environmental gradients along environmental gradient factors in rocky desertified area of a typical karst Ggorge

Huan jing ke xue= Huanjing kexue
Li RongXue-Lian Du

Abstract

We analyzed the responses of delta13 C values of plant leaves to environmental factors (namely, soil water storage, air relative humidity, light intensity, depths of soil, soil organic content, average temperature and soil water content) and the correlations between them, by measuring delta13 C values of leaves for 11 plants species from 4 typical communities with different karst rocky desertification backgrounds in a typical karst catchments basin, Huajiang Gorge. It is revealed that, the delta13 C values and water use efficient of most species decrease with the increasing of water supply; but a few species exhibit an opposite trend and several others exhibit no change in delta13 C values or water use efficiency when these environmental factors varied. Moreover, the correlation analysis indicates that the soil water storage is the leading factor for Pistacia weinmannifolia, Mallotus repandus and Alchornea trewioides, while the depths of soil is essential factor for Nephrolepis cordifolia and Mallotus japonicus var. floccosus, and the light intensity is leading factor for N. cordifolia, Alangium chinense, Broussonetia papyrifera. However, the leading factor for some species like Rapanea kwangsiensis, Sapium rotundifolium and Ci...Continue Reading

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