应用生态学报2017，Vol.28Issue(4)：1094-1102,9.DOI:10.13287/j.1001-9332.201704.020
亚热带湿地松叶片多元素化学计量与养分回收对氮添加的短期响应
Short-term responses of foliar multi-element stoichiometry and nutrient resorption of slash pine to N addition in subtropical China
摘要
Abstract
We conducted a field experiment with three levels of N addition (0,40 and 120 kg N · hm-2 · a-1) in a Pinus elliottii plantation in subtropical China and collected green and senesced needles of P.elliottii at the peak (July) and the end (October) of each growing season in 2014 and 2015 for clarifying effects of nitrogen additions on concentrations of nine elements (C,N,P,K,Ca,Mg,Al,Fe and Mn) in the green and senesced needles and their corresponding resorption efficiency and resorption proficiency.Our results showed that N addition had positive effects on concentrations of N,Al and Mn,negative effects on the P concentration and the Ca concentration in 2014,and neutral effects on concentrations of C,K,Mg and Fe in green needles.N addition significantly increased foliar N/P.These stoichiometric responses were N level-dependent (stronger at high N rate).N addition significantly decreased N resorption efficiency in 2015 and increased that of K in 2014.Compared with the resorption efficiency,resorption proficiency responded more strongly to increased available N.N addition significantly decreased resorption proficiency of N,and increased that of P,K,and the concentration of Fe in senesced needles,however,there were no significant effects on the concentrations of Ca,Mg,Al and Mn in senesced needles.We concludedthat responses of foliar stoichiometry to N addition were element-specific,and plants might cope with changing environments via adjusting internal nutrient cycle (resorption).The elevated foliar N/P and K/P suggested a shift from N and P co-limitation to P limitation with N additions,and increased concentrations of Al and Mn might imply potential toxicity of metal ions to P.elliottii.关键词
氮添加/生态化学计量/多元素/养分回收Key words
nitrogen addition/ecological stoichiometry/multi-element/nutrient resorption引用本文复制引用
陈微微,寇亮,蒋蕾,高文龙,杨浩,王辉民,李胜功..亚热带湿地松叶片多元素化学计量与养分回收对氮添加的短期响应[J].应用生态学报,2017,28(4):1094-1102,9.基金项目
本文由国家重点研发计划项目(2016YFD0600202)和国家自然科学基金项目(31130009,31570443)资助 This work was supported by the National Key Research&Development Plan (2016YFD0600202) and the National Natural Science Foundation of China (31130009,31570443). （2016YFD0600202）
