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首页> 美国卫生研究院文献>SpringerPlus >Effects of elevated root zone CO2 on xerophytic shrubs in re-vegetated sandy dunes at smaller spatial and temporal scales
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Effects of elevated root zone CO2 on xerophytic shrubs in re-vegetated sandy dunes at smaller spatial and temporal scales

机译：在较小的时空尺度上根区CO 2浓度升高对再生植被沙丘上的旱生灌木的影响

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The below-ground CO2 concentration in some crusted soils or flooded fields is usually ten or hundred times larger than the normal levels. Recently, a large number of studies have focused on elevated CO2 in the atmosphere; however, only few have examined the influence of elevated root zone CO2 on plant growth and vegetation succession. In the present study, a closed-air CO2 enrichment (CACE) system was designed to simulate elevated CO2 concentrations in the root zones. The physio-ecological characteristics of two typical xerophytic shrubs C. korshinskii and A. ordosica in re-vegetated desert areas were investigated at different soil CO2 concentrations from March 2011 to October 2013. Results showed that plant growth, phenophase, photosynthetic rate, stomatal conductance, transpiration rate, and water use efficiency for the two xerophytic shrubs were all increased at first and then decreased with increasing soil CO2 concentrations, and the optimal soil CO2 concentration thresholds for C. korshinskii and A. ordosica were 0.554 and 0.317%, respectively. And A. ordosica was more tolerate to root zone CO2 variation when compared with C. korshinskii, possible reasons and vegetation succession were also discussed.Electronic supplementary materialThe online version of this article (doi:10.1186/s40064-015-1091-7) contains supplementary material, which is available to authorized users.
机译：在一些结s的土壤或淹水田中，地下二氧化碳的浓度通常比正常水平高十或一百倍。最近，大量研究集中在大气中二氧化碳的增加上。然而，只有极少数人研究了升高的根区二氧化碳对植物生长和植被演替的影响。在本研究中，设计了一个封闭式空气CO2浓缩（CACE）系统来模拟根区中升高的CO2浓度。从2011年3月至2013年10月，在不同的土壤CO 2浓度下，研究了两个典型的旱生灌木C. korshinskii和A. ordosica在不同植被CO 2浓度下的生理生态特征。结果表明，植物生长，表相，光合速率，气孔导度两种旱生灌木的蒸腾速率和水分利用效率均先升高，然后随土壤CO2浓度的增加而降低，C。korshinskii和A. ordosica的最佳土壤CO2浓度阈值分别为0.554和0.317％。与科尔氏梭菌相比，棉铃虫对根区CO2的耐受性更强，还讨论了可能的原因和植被演替。电子补充材料本文的在线版本（doi：10.1186 / s40064-015-1091-7）包含补充材料，授权用户可以使用。

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