Intraspecific N and P stoichiometry of Phragmites australis: geographic patterns and variation among climatic regions.
Intraspecific N and P stoichiometry of Phragmites australis: geographic patterns and variation among climatic regions.
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芦苇种内氮磷化学计量：地理格局和气候区域变化
DOI：
10.1038/srep43018
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发表时间：
2017-02-24
影响因子：
4.6
通讯作者：
Dong M
中科院分区：
文献类型：
--
作者：
Hu YK;Zhang YL;Liu GF;Pan X;Yang X;Li WB;Dai WH;Tang SL;Xiao T;Chen LY;Xiong W;Song YB;Dong M
叶片化学计量学的地理格局反映了植物对环境的适应。陆生植物的叶片化学计量随环境梯度的变化已经得到了广泛的研究，但对种内叶片化学计量的研究却很少，特别是对湿地植物。本文分析了分布在中国3个气候区（亚热带、温带和高原）的天然湿地中芦苇（Phragmites australis）叶片N和P的数据集，以及文献资料和野外调查的环境变量（地理、气候和土壤）。除叶片氮磷比随海拔升高外，中国各地南菖蒲叶片营养成分没有明显的地理分布规律。叶片N和N:P随年平均温度（MAT）下降，且与土壤pH、C:N比和有效磷密切相关。冗余分析表明，气候和土壤变量解释了叶片N、P和N:P总变化的62.1%。此外，温带和亚热带叶片氮含量随土壤有效磷含量的增加而增加，而亚热带叶片氮磷含量随土壤ph值的降低而降低。这些不同于陆生植物的分布规律可能表明气候和土壤性质的变化对湿地和陆地生态系统的影响是不同的。
Geographic patterns in leaf stoichiometry reflect plant adaptations to environments. Leaf stoichiometry variations along environmental gradients have been extensively studied among terrestrial plants, but little has been known about intraspecific leaf stoichiometry, especially for wetland plants. Here we analyzed the dataset of leaf N and P of a cosmopolitan wetland species, Phragmites australis, and environmental (geographic, climate and soil) variables from literature and field investigation in natural wetlands distributed in three climatic regions (subtropical, temperate and highland) across China. We found no clear geographic patterns in leaf nutrients of P. australis across China, except for leaf N:P ratio increasing with altitude. Leaf N and N:P decreased with mean annual temperature (MAT), and leaf N and P were closely related to soil pH, C:N ratio and available P. Redundancy analysis showed that climate and soil variables explained 62.1% of total variation in leaf N, P and N:P. Furthermore, leaf N in temperate region and leaf P in subtropical region increased with soil available P, while leaf N:P in subtropical region decreased with soil pH. These patterns in P. australis different from terrestrial plants might imply that changes in climate and soil properties can exert divergent effects on wetland and terrestrial ecosystems.