Guo Chao, Tuo Bin, Su Tian, Zheng Li Ting, Liu Xiang Yu, Yin Fang, He Dong, Yan En- Ong
Putuo Forest Ecosystem Research and Observation Station/Tiantong National Forest Ecosystem Observation and Research Station, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China.
Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China.
Ying Yong Sheng Tai Xue Bao. 2018 Feb;29(2):380-388. doi: 10.13287/j.1001-9332.201802.034.
Understanding variation of carbon (C), nitrogen (N) and phosphorus (P) stoichiometry in common plant species across islands along a latitude gradient is insightful to reveal the adaptation strategies of plant species to environmental changes. Five common herbaceous species including Artemisia argyi, Setaira viridis, Humulus japonicus, Ophiopog onjaponicus, and Oxalis corniculata were sampled in 125 plots across nine islands in Eastern China. C, N and P contents in leaves, stems, and roots of five plant species were measured, and their relationships with soil C, N and P contents as well as mean annual air temperature (MAT) and mean annual precipitation (MAP) were investigated. The results showed that the range of C, N and P contents in aboveground parts of five species across nine islands was 352.16-518.16, 10.81-34.43, 0.58-2.38 mg·g, while the range of C:N, N:P and C:P was 11.98-38.99, 4.67-27.47, 133.39-748.54, respectively. In terms of roots, the range of C, N and P contents of five species was 312.28-493.34, 9.26-23.27, 0.40-2.10 mg·g, while the range of C:N, N:P and C:P was 18.18-46.79, 8.53-37.38, 174.45-1120.40, respectively. With the increases of latitude, contents of N and P in aboveground parts increased, but N:P decreased. Relative to N content, P content showed higher variation and was largely dependent on environment. Climate factors explained 60% of the variation of N and P contents and N:P across nine islands. In contrast, N and P contents and N:P of roots were independent of latitude, with climatic factors only explained 6%-10% of their variations. The contribution of climatic factors and soil nutrients contributed to the variations of N and P contents differed between above ground parts and roots of five species. Soil N and P had significant effects on P content in roots. Soil P content was positively correlated to aboveground P content. Soil properties explained 37% of the variation in N and P contents of plant roots. Our results suggested that latitude-associated environment shifts were the main drivers of variation in N and P contents and N:P in aboveground parts, and soil nutrients especially affected variation in P in roots of five common plant species, when the effects of plant phylogeny was controlled.
了解沿纬度梯度分布的各岛屿上常见植物物种的碳（C）、氮（N）和磷（P）化学计量比变化，对于揭示植物物种对环境变化的适应策略具有重要意义。在中国东部九个岛屿的125个样地中，采集了包括艾草、狗尾草、葎草、麦冬和酢浆草在内的五种常见草本植物。测定了这五种植物叶片、茎和根中的C、N和P含量，并研究了它们与土壤C、N和P含量以及年平均气温（MAT）和年平均降水量（MAP）的关系。结果表明，九个岛屿上五种植物地上部分的C、N和P含量范围分别为352.16 - 518.16、10.81 - 34.43、0.58 - 2.38 mg·g，而C:N、N:P和C:P的范围分别为11.98 - 38.99、4.67 - 27.47、133.39 - 748.54。就根部而言，五种植物的C、N和P含量范围分别为312.28 - 493.34、9.26 - 23.27、0.40 - 2.10 mg·g，而C:N、N:P和C:P的范围分别为18.18 - 46.79、8.53 - 37.38、174.45 - 1120.40。随着纬度的增加，地上部分的N和P含量增加，但N:P降低。相对于N含量，P含量表现出更高的变异性，且在很大程度上依赖于环境。气候因素解释了九个岛屿上N和P含量以及N:P变异的60%。相比之下，根部的N、P含量以及N:P与纬度无关，气候因素仅解释了它们变异的6% - 10%。气候因素和土壤养分对五种植物地上部分和根部N、P含量变异的贡献存在差异。土壤N和P对根部P含量有显著影响。土壤P含量与地上部分P含量呈正相关。土壤性质解释了植物根部N和P含量变异的37%。我们的结果表明，在控制植物系统发育影响的情况下，与纬度相关的环境变化是五种常见植物地上部分N、P含量以及N:P变异的主要驱动因素，土壤养分尤其影响根部P的变异。
