Global-scale latitudinal patterns of plant fine-root nitrogen and phosphorus.
Global-scale latitudinal patterns of plant fine-root nitrogen and phosphorus.
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DOI：
10.1038/ncomms1346
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发表时间：
2011-06
影响因子：
16.6
通讯作者：
Zhiyou Yuan;Han Y. H. Chen;Han Y. H. Chen;P. B. Reich;P. B. Reich
中科院分区：
文献类型：
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作者：
Zhiyou Yuan;Han Y. H. Chen;Han Y. H. Chen;P. B. Reich;P. B. Reich
植物的大部分水分和必需土壤养分的吸收是由细根完成的。因此，了解细根氮磷循环的全球地理格局具有重要意义。通过汇总来自51个国家211项研究的植物根系数据，我们发现，与绿叶相比，活细根的氮(N)和磷(P)含量较低，但N:P比率相似。细根氮磷比在不同生物群系间存在差异，且随纬度呈指数下降。这与之前报道的绿叶氮磷在纬度上呈线性下降相反，但与凋落叶氮磷的非线性下降一致。根系和叶片的纬度N:P下降反映了气候、土壤年龄和风化的共同影响，响应函数形状的差异可能是它们不同的N和P利用策略的结果。
Most water and essential soil nutrient uptake is carried out by fine roots in plants. It is therefore important to understand the global geographic patterns of fine-root nitrogen and phosphorus cycling. Here, by compiling plant root data from 211 studies in 51 countries, we show that live fine roots have low nitrogen (N) and phosphorus (P), but similar N:P ratios when compared with green leaves. The fine-root N:P ratio differs between biomes and declines exponentially with latitude in roots of all diameter classes. This is in contrast to previous reports of a linear latitudinal decline in green leaf N:P, but consistent with nonlinear declines in leaf litter N:P. Whereas the latitudinal N:P decline in both roots and leaves reflects collective influences of climate, soil age and weathering, differences in the shape of the response function may be a result of their different N and P use strategies.