阜康典型荒漠C3植物稳定碳同位素值的环境分析

doi:10.13826/j.cnki.cn65-1103/x.2002.04.010

Abstract

Abstract: Water is usually considered to be the key limiting factor for growth of desert plants, the positive relationship between the primary productivity and rainfall is generally observed. Research in recent years has demonstrated that carbon isotope values in C 3 plants can be used as an integrated indicator of relative water use efficiency. Absolute water efficiency in desert plants is influenced during the growing season by changes in water availability and leaf-to-air water vapor gradient, and thus changes significantly between seasons. These changes affect all plant species in a community, however, and therefore the relative ranking of carbon isotope values among species provides insight into fitness components related to water use efficiency since the relative ranking of carbon isotope values among plants grown under common conditions remain constant over time. On the other hand, vegetation is sensitive to the environmental change. Under the different environmental and climatic conditions, the vegetation is different even in the same area. After died, the plant body decomposed and its residual entered into soil, which is the main source of the organic matter in soil. So, the past climatic change and the vegetation condition could be uncovered by the variation of the carbon isotope values of organic matter in soil. In the present papers, leaf carbon isotope values were measured on species occurring within a desert community at Fukang County, Xinjiang. Leaf carbon isotope values ranged from -23.15‰ to -29. 95‰, averaging -27. 61‰, which was broadly comparable with values reported for other desert plants in the world. Less rainfall led to higher leaf carbon isotope values, but the magnitude of the isotope value changes depended on the species. A pattern of increasing leaf carbon isotope values with greater longevity was present. The analysis showed that the change of aridity and humidity could be disclosed by studying the carbon isotope values of soil and land sediments.

Key words: desert C3plant, stable carbon isotope values, Fukang

CLC Number:

Q945

CHEN Tuo, MA Jian, FENG Hu-yuan, HE Yuan-qing, XU Shi-jian, QIANG Wei-ya, AN Li-zhe. ENVIRONMENTAL ANALYSIS OF STABLE CARBON ISOTOPE VALUES IN TYPICAL DESERT C3PLANTS OF THE FUKANG, XINJIANG[J].Arid Land Geography, 2002, 25(4): 342-345.

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ENVIRONMENTAL ANALYSIS OF STABLE CARBON ISOTOPE VALUES IN TYPICAL DESERT C3PLANTS OF THE FUKANG, XINJIANG

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