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首页> 美国卫生研究院文献>Scientific Reports >Carbon Storage Patterns of Caragana korshinskii in Areas of Reduced Environmental Moisture on the Loess Plateau China
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Carbon Storage Patterns of Caragana korshinskii in Areas of Reduced Environmental Moisture on the Loess Plateau China

机译：黄土高原环境水分减少地区柠条锦鸡儿的碳储量特征

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摘要

Precipitation patterns are influenced by climate change and profoundly alter the carbon sequestration potential of ecosystems. Carbon uptake by shrubbery alone accounts for approximately one-third of the total carbon sink; however, whether such uptake is altered by reduced precipitation is unclear. In this study, five experimental sites characterised by gradual reductions in precipitation from south to north across the Loess Plateau were used to evaluate the Caragana korshinskii’s functional and physiological features, particularly its carbon fixation capacity, as well as the relationships among these features. We found the improved net CO2 assimilation rates and inhibited transpiration at the north leaf were caused by lower canopy stomatal conductance, which enhanced the instantaneous water use efficiency and promoted plant biomass as well as carbon accumulation. Regional-scale precipitation reductions over a certain range triggered a distinct increase in the shrub’s organic carbon storage with an inevitable decrease in the soil’s organic carbon storage. Our results confirm C. korshinskii is the optimal dominant species for the reconstruction of fragile dryland ecosystems. The patterns of organic carbon storage associated with this shrub occurred mostly in the soil at wetter sites, and in the branches and leaves at drier sites across the arid and semi-arid region.
机译：降水方式受气候变化的影响，并深刻改变了生态系统的固碳潜力。仅灌木丛的碳吸收量约占总碳汇的三分之一。但是，尚不清楚降水减少是否会改变这种吸收。在这项研究中，以黄土高原上从南到北降水量逐渐减少为特征的五个实验点用于评估柠条锦鸡儿的功能和生理特征，尤其是其碳固定能力以及这些特征之间的关系。我们发现，由于冠层气孔导度降低，提高了净CO2同化率并抑制了北部叶片的蒸腾作用，从而提高了瞬时水分利用效率，促进了植物生物量以及碳的积累。在一定范围内，区域范围内的降水减少导致灌木的有机碳储量显着增加，而土壤有机碳储量必然减少。我们的结果证实，C。korshinskii是重建脆弱的旱地生态系统的最佳优势种。与这种灌木相关的有机碳存储模式主要发生在干旱地区的土壤中，而在干旱和半干旱地区的干旱地区的枝叶中。

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