Contrasting effects of N addition on the N and P status of understory vegetation in plantations of sapling and mature Larix principis-rupprechtii  

作　　者：Tao Yan Tiantian Qu Huanhuan Song Philippe Ciais Shilong Piao Zhenzhong Sun Hui Zeng 

机构地区：[1]Sino-French Institute for Earth System Science,College of Urban and Environmental Sciences,Peking University,5 Yiheyuan Road,Haidian District,Beijing 100871,China [2]School of Urban Planning and Design,Peking University,2199 Lishui Road,Nanshan District,Shenzhen 518055,China [3]Institute of Applied Ecology,Chinese Academy of Sciences,72 Wenhua Road,Shenhe District,Shenyang 110016,China [4]Laboratoire des Sciences du Climat et de l’Environnement,UMR 1572 CEA-CNRS-UVSQ,91191 Gif-sur-Yvette,France [5]Key Laboratory of Alpine Ecology and Biodiversity,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,16 Lincui Road,Chaoyang District,Beijing 100085,China [6]Center for Excellence in Tibetan Earth Science,Chinese Academy of Sciences,16 Lincui Road,Chaoyang District,Beijing 100085,China

出　　处：《Journal of Plant Ecology》2018年第6期843-852,共10页植物生态学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(41401096,41171202);the National Youth Top-notch Talent Support Program in China(8200800027).

摘　　要：Aims The productivity of forest plantations in temperate areas is often lim-ited by nitrogen(N),but may shift towards phosphorus(P)limitation with increasing atmospheric N deposition.Nutrient resorption is a nutrient conservation strategy in plants.Although data on nutrient resorption are available for overstory trees,there are few data for understory vegetation.Methods We examined leaf N and P concentrations and N and P resorption efficiencies(NRE and PRE,respectively)in eight understory species in 11-and 45-year-old Larix principis-rupprechtii stands subjected to N supplementation over a 3-year period.Important findings Leaf N concentrations and N:P ratios increased and P concentrations decreased,with N input in species within the 45-year-old stand,but not in the 11-year-old stand.NRE and PRE were not altered by N input in any of the species in either stand,but N resorption pro-ficiency decreased and P resorption proficiency increased,in the species in the 45-year-old stand.Thus,the growth of understory species may be more P-limited in the 45-versus 11-year-old stand,and nutrient resorption proficiency was more sensitive to N add-ition than nutrient resorption efficiency.These results will improve the understanding of nutrient use strategies and their responses to N addition in understory vegetation.The contrasting effects of N addition on nutrient status between stand ages cannot be ignored when modeling ecosystem nutrient cycling under global N depos-ition conditions.

关 键 词：larch plantation N addition nutrient resorption stand age understory species 

分 类 号：Q94[生物学—植物学]