Much attention has been paid to the stoichiometry of carbon(C), nitrogen(N), and phosphorus(P) because of their significance for plant growth and climate change. However, other nutrients, such as sulfur(S), are often ...Much attention has been paid to the stoichiometry of carbon(C), nitrogen(N), and phosphorus(P) because of their significance for plant growth and climate change. However, other nutrients, such as sulfur(S), are often ignored. In this study, we analyzed the stoichiometry of N, P, and S in leaves of 348 plant species in China's forests. The results show higher N content and higher molar ratios of N/P and P/S in Angiospermae than in Gymnospermae. At the family level, Ulmaceae absorbed more N and P from soils than other families, and Cupressaceae absorbed more S than other families. In addition,except for bamboo and other tropical forests, leaf N and P content of China's forests generally increased from low to middle latitudes and then slightly decreased or plateaued at high latitudes. Plant ecotypes, taxonomic groups, environmental conditions, atmospheric S precipitation, and soil-available N and P significantly affected the distribution and stoichiometry of leaf N, P, and S in China's forests.Our study indicates that China's forests are likely limited by P and S deficiencies which may increase in the future.展开更多
以浙江天童国家森林公园人工模拟受损常绿阔叶林样地为研究地点,分析了不同干扰下(择伐大树、清理下木、皆伐、皆伐及去除表土层)植被恢复初期5种主要优势树种最大净光合速率(Amax,net photosynthesis based on area)、比叶面积(SLA,spe...以浙江天童国家森林公园人工模拟受损常绿阔叶林样地为研究地点,分析了不同干扰下(择伐大树、清理下木、皆伐、皆伐及去除表土层)植被恢复初期5种主要优势树种最大净光合速率(Amax,net photosynthesis based on area)、比叶面积(SLA,specific leaf area)和叶片氮、磷含量(N,P,leaf nitrogen and phosphor concentration)等叶性状,以期揭示不同树种对干扰的生态适应性.结果表明:(1)干扰后光照强度的增加导致叶片SLA降低,Amax和叶N含量增加;(2)表土层的去除使得土壤磷有效性的减少,从而导致叶P含量的下降,但对Amax的影响较小;(3)高Amax,SLA以及叶N,P含量的落叶树种山鸡椒(Litsea cubeba)具有很强的资源获取能力和高的生产力,从而在植被恢复早期占据竞争优势.木荷(Schima superba)叶N,P含量最低,但在不同干扰下Amax都高于其他常绿树种,且与叶N含量之间存在具有显著正相关性.干扰样地中石栎(Lithocarpus glaber)叶N含量较对照显著增加,并维持在较高水平,与Amax存在显著正相关性,且其叶片抵御强光伤害的能力较强.米槠(Castanopsis carlesii)的Amax,SLA,叶N,P含量均为中等水平,其Amax和SLA对环境具有较强的可塑性,但叶N含量在各样地中较为稳定.栲树(Castanopsis fargesii)的叶性状可塑性较差,Amax小,且利用高光强的能力弱.展开更多
基金support from the National Natural Science Foundation of China(41522207,41571130042)the State’s Key Project of Research and Development Plan of China(2016YFA0601002)
文摘Much attention has been paid to the stoichiometry of carbon(C), nitrogen(N), and phosphorus(P) because of their significance for plant growth and climate change. However, other nutrients, such as sulfur(S), are often ignored. In this study, we analyzed the stoichiometry of N, P, and S in leaves of 348 plant species in China's forests. The results show higher N content and higher molar ratios of N/P and P/S in Angiospermae than in Gymnospermae. At the family level, Ulmaceae absorbed more N and P from soils than other families, and Cupressaceae absorbed more S than other families. In addition,except for bamboo and other tropical forests, leaf N and P content of China's forests generally increased from low to middle latitudes and then slightly decreased or plateaued at high latitudes. Plant ecotypes, taxonomic groups, environmental conditions, atmospheric S precipitation, and soil-available N and P significantly affected the distribution and stoichiometry of leaf N, P, and S in China's forests.Our study indicates that China's forests are likely limited by P and S deficiencies which may increase in the future.
