Biogeographic patterns of nutrient resorption from Quercus variabilis Blume leaves across China.
Biogeographic patterns of nutrient resorption from Quercus variabilis Blume leaves across China.
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DOI：
10.1111/plb.12420
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发表时间：
2016-05
期刊：
影响因子：
3.9
通讯作者：
X. Sun;H. Kang;H. Y. H. Chen-H.-Y.-H.-Chen-34702920;B. Björn;B. F. Samuel;C. Liu
中科院分区：
文献类型：
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作者：
X. Sun;H. Kang;H. Y. H. Chen-H.-Y.-H.-Chen-34702920;B. Björn;B. F. Samuel;C. Liu
在不同的分类水平和地理范围的营养吸收的变化进行了研究。然而，在其分布的各个物种水平上的营养吸收的变量性状知之甚少。研究了栓皮栎（Quercus variabilis）叶片养分吸收的变异性及其环境控制。磷的平均再吸收效率最高，其次是钾、氮、硫、镁和碳。土壤和绿色叶片中的养分含量和气候对土壤养分的吸收效率有很大的影响，但与单位面积叶片质量的关系不大。气候因素，特别是生长季节的长度，是占主导地位的驱动力的养分再吸收效率，除了C，这是密切相关的绿色叶C状态。而绿色叶营养状况是影响叶片养分生产的主要因素，但C.氮、磷、钾、硫的吸收效率随纬度的升高而显著增加，与生长季长度和年均温呈负相关。反过来，N，P，K和S在衰老的叶片随着纬度的下降，可能是由于他们有效的再吸收响应气候变化，但增加镁和C没有变化。结果表明，Q. variabilis在营养成分和生长环境方面差异很大。我们的研究结果提供了重要的见解，了解在单个物种水平的营养保护策略及其对营养循环的可能影响。
The variation in nutrient resorption has been studied at different taxonomic levels and geographic ranges. However, the variable traits of nutrient resorption at the individual species level across its distribution are poorly understood. We examined the variability and environmental controls of leaf nutrient resorption of Quercus variabilis, a widely distributed species of important ecological and economic value in China. The mean resorption efficiency was highest for phosphorus (P), followed by potassium (K), nitrogen (N), sulphur (S), magnesium (Mg) and carbon (C). Resorption efficiencies and proficiencies were strongly affected by climate and respective nutrients concentrations in soils and green leaves, but had little association with leaf mass per area. Climate factors, especially growing season length, were dominant drivers of nutrient resorption efficiencies, except for C, which was strongly related to green leaf C status. In contrast, green leaf nutritional status was the primary controlling factor of leaf nutrient proficiencies, except for C. Resorption efficiencies of N, P, K and S increased significantly with latitude, and were negatively related to growing season length and mean annual temperature. In turn, N, P, K and S in senesced leaves decreased with latitude, likely due to their efficient resorption response to variation in climate, but increased for Mg and did not change for C. Our results indicate that the nutrient resorption efficiency and proficiency of Q. variabilis differed strongly among nutrients, as well as growing environments. Our findings provide important insights into understanding the nutrient conservation strategy at the individual species level and its possible influence on nutrient cycling.