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首页> 美国卫生研究院文献>Annals of Botany >Optimal balance of water use efficiency and leaf construction cost with a link to the drought threshold of the desert steppe ecotone in northern China
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Optimal balance of water use efficiency and leaf construction cost with a link to the drought threshold of the desert steppe ecotone in northern China

机译：与中国北方荒漠草原过渡带干旱阈值相关的水分利用效率与叶片建设成本的最佳平衡

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>Background and Aims In arid environments, a high nitrogen content per leaf area (Narea) induced by drought can enhance water use efficiency (WUE) of photosynthesis, but may also lead to high leaf construction cost (CC). Our aim was to investigate how maximizing Narea could balance WUE and CC in an arid-adapted, widespread species along a rainfall gradient, and how such a process may be related to the drought threshold of the desert–steppe ecotone in northern China.>Methods Along rainfall gradients with a moisture index (MI) of 0·17–0·41 in northern China and the northern Tibetan Plateau, we measured leaf traits and stand variables including specific leaf area (SLA), nitrogen content relative to leaf mass and area (Nmass, Narea) and construction cost (CCmass, CCarea), δ13C (indicator of WUE), leaf area index (LAI) and foliage N-pool across populations of Artemisia ordosica.>Key Results In samples from northern China, a continuous increase of Narea with decreasing MI was achieved by a higher Nmass and constant SLA (reduced LAI and constant N-pool) in high-rainfall areas (MI > 0·29), but by a lower SLA and Nmass (reduced LAI and N-pool) in low-rainfall areas (MI ≤ 0·29). While δ13C, CCmass and CCarea continuously increased with decreasing MI, the low-rainfall group had higher Narea and δ13C at a given CCarea, compared with the high-rainfall group. Similar patterns were also found in additional data for the same species in the northern Tibetan Plateau. The observed drought threshold where MI = 0·29 corresponded well to the zonal boundary between typical and desert steppes in northern China.>Conclusions Our data indicated that below a climatic drought threshold, drought-resistant plants tend to maximize their intrinsic WUE through increased Narea at a given CCarea, which suggests a linkage between leaf functional traits and arid vegetation zonation.
机译：>背景和目的在干旱环境中，干旱引起的每叶面积（Narea）高氮含量可以提高光合作用的水分利用效率（WUE），但也可能导致高的叶片建造成本（CC） 。我们的目的是研究如何最大程度地提高Narea值，使其能够在干旱梯度上沿降雨梯度平衡WUE和CC，以及这种过程如何与中国北方荒漠草原过渡带的干旱阈值相关。 >方法在中国北方和青藏高原北部，湿度指数（MI）为0·17–0·41的降雨梯度下，我们测量了叶片的性状和林分变量，包括特定的叶面积（SLA），氮含量相对于不同种群的叶片质量和面积（Nmass，Narea）和建设成本（CCmass，CCarea），δ 13 C（WUE指标），叶面积指数（LAI）和叶片氮池>主要结果：在中国北方的样本中，高雨量地区的较高Nmass和恒定的SLA（减少的LAI和恒定的N池）实现了Narea的持续增加和MI降低。 MI> 0·29），但在低雨量区（MI），SLA和Nmass降低（LAI和N池减少） ≤0·29）。尽管δ 13 C，CCmass和CCarea随MI的降低而持续增加，但低降雨组在给定CCarea上具有较高的Narea和δ 13 C，相比之下，降雨组。在青藏高原北部相同物种的其他数据中也发现了类似的模式。 MI = 0·29观测到的干旱阈值与中国北方典型草原和荒漠草原的地带边界高度吻合。>结论我们的数据表明，在气候干旱阈值以下，抗旱植物趋向于最大化通过增加给定CCarea上的Narea来提高它们的固有WUE，这表明叶片功能性状与干旱植被带之间存在联系。

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