文献类型：会议论文

英文题名：The response of tree growth to nitrogen and phosphorus additions in a tropical montane rainforest

作者：Jiang, Lai[1] Tian, Di[1] Ma, Suhui[1] Zhou, Xuli[1] Xu, Longchao[2] Zhu, Jianxiao[1] Jing, Xin[1] Zheng, Chengyang[1] Shen, Haihua[2] Zhou, Zhang[3] Li, Yide[3] Zhu, Biao[1] Fang, Jingyun[1]

第一作者：Jiang, Lai

通信作者：Jiang, L[1]

机构：[1]Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Dept Ecol,Coll Urban & Environm Sci, Beijing 100871, Peoples R China;[2]Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China;[3]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 520510, Guangdong, Peoples R China

会议论文集：1st International Conference on Ecotechnologies for Controlling Non-Point Source Pollution and Protecting Aquatic Ecosystem (ENPE)

会议日期：MAR 26-28, 2017

会议地点：Nanjing, PEOPLES R CHINA

语种：英文

外文关键词：Nitrogen deposition; Tree growth; Phosphorus; Limitation; Tropical forest

年份：2018

摘要：Rapid increase of global nitrogen (N) deposition has greatly altered carbon cycles and functioning of forest ecosystems. Previous studies have focused on changes in carbon dynamics of temperate and subtropical forests through N enrichment experiments; however, the effects of N deposition on tree growth remain inconsistent, especially in tropical forests. Here, we conducted a five-year N addition experiment (0 and 50 kg N ha(-1) yr(-1)) in a tropical montane rain forest in Hainan Island, China, to explore the effects of enhanced N deposition on growth of trees. We also set phosphorus (P) treatment (50 kg P ha(-1) yr(-1)) and N + P treatment (50 kg N ha(-1) yr(-1) + 50 kg P ha(-1) yr(-1)) to examine potential P limitation driven by N deposition. Our results showed that N addition has not significantly influenced tree growth, while P addition significantly increased the relative growth rate of small (diameter at breast height, DBH <= 10 cm) and medium(10 < DBH <= 20 cm) trees. The combined N and P addition accelerated the growth of small trees, but did not affect the growth of medium and large (20 cm < DBH) trees. These contrasting effects of N and P addition on tree growth indicate that the tropical montane forest is mainly limited by P, which suggests the importance of P in regulating growth of trees in tropical forests. (c) 2017 Elsevier B.V. All rights reserved.