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首页> 外文期刊>Plant and Soil >Combined effects of elevated CO sub(2) and soil drought on carbon and nitrogen allocation of the desert shrub Caragana intermedia
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Combined effects of elevated CO sub(2) and soil drought on carbon and nitrogen allocation of the desert shrub Caragana intermedia

机译：CO sub（2）升高和土壤干旱对沙漠灌木柠条锦鸡儿碳氮分配的综合影响

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摘要

Impacts of either elevated CO sub(2) or drought stress on plant growth have been studied extensively, but interactive effects of these on plant carbon and nitrogen allocation is inadequately understood yet. In this study the response of the dominant desert shrub, Caragana intermedia Kuanget H.c.Fu, to the interaction of elevated CO sub(2) (700 plus or minus 20 mu mol mol super(-1)) and soil drought were determined in two large environmental growth chambers (18 m super(2)). Elevated CO sub(2) increased the allocation of biomass and carbon into roots and the ratio of carbon to nitrogen (C:N) as well as the leaf soluble sugar content, but decreased the allocation of biomass and carbon into leaves, leaf nitrogen and leaf soluble protein concentrations. Elevated CO sub(2) significantly decreased the partitioning of nitrogen into leaves, but increased that into roots, especially under soil drought. Elevated CO sub(2) significantly decreased the carbon isotope discrimination ( Delta ) in leaves, but increased them in roots, and the ratio of Delta values between root and leaf, indicating an increased allocation into below-ground parts. It is concluded that stimulation of plant growth by CO sub(2) enrichment may be negated under soil drought, and under the future environment, elevated CO sub(2) may partially offset the negative effects of enhanced drought by regulating the partitioning of carbon and nitrogen.
机译：已经广泛研究了升高的CO sub（2）或干旱胁迫对植物生长的影响，但还不足以了解这些相互作用对植物碳和氮分配的影响。在这项研究中，确定了两个大的主要沙漠灌木柠条锦鸡儿的Kuanget HcFu对升高的CO sub（2）（700正负20μmolmol mol super（-1））与土壤干旱的相互作用的响应环境生长室（18 m super（2））。升高的CO sub（2）增加了生物量和碳在根中的分配以及碳氮比（C：N）和叶片可溶性糖含量，但减少了生物量和碳在叶片，叶片氮和碳中的分配。叶片可溶性蛋白浓度。升高的CO sub（2）明显减少了氮在叶中的分配，但增加了氮在根中的分配，尤其是在土壤干旱下。升高的CO sub（2）显着降低了叶片中碳同位素的分辨力（Delta），但增加了根中的碳同位素辨别力，并且增加了根与叶之间的Delta值之比，表明增加了对地下部分的分配。结论是，在土壤干旱下，CO sub（2）富集对植物生长的刺激作用可能被抵消，在未来环境下，CO sub（2）的升高可能通过调节碳和碳的分配来部分抵消干旱加剧的负面影响。氮。

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