文献类型：期刊文献

英文题名：Do N-fixing legumes promote neighbouring diversity in the tropics?

作者：Xu, Han[1] Detto, Matteo[2,3] Li, Yanpeng[1] Li, Yide[1] He, Fangliang[4] Fang, Suqin[5]

第一作者：许涵

通信作者：Fang, SQ[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou, Guangdong, Peoples R China;[2]Princeton Univ, Dept Ecol & Evolutionary Biol, Princeton, NJ 08544 USA;[3]Smithsonian Trop Res Inst, Balboa, Ancon, Panama;[4]Univ Alberta, Dept Renewable Resources, Edmonton, AB, Canada;[5]Sun Yat Sen Univ, Sch Life Sci, State Key Lab Biocontrol, Guangzhou 510275, Guangdong, Peoples R China

年份：2019

卷号：107

期号：1

起止页码：229-239

外文期刊名：JOURNAL OF ECOLOGY

收录：;Scopus(收录号：2-s2.0-85050611360);WOS:【SCI-EXPANDED(收录号:WOS:000459070600020)】；

基金：National Non-profit Institute Research Grant of CAF, Grant/Award Number: CAFYBB2017QC003 and RITFYWZX201505; National Natural Science Foundation of China, Grant/Award Number: 31370441 and 31670628; Pearl River S&T Nova Program of Guangzhou, Grant/Award Number: 201610010082

语种：英文

外文关键词：habitat preference; legumes; neighbour species richness; nitrogen demanding; nitrogen fixation ability; soil nitrogen; spatial distribution pattern

摘要：1. Although nitrogen-fixing plants play a crucial role in maintaining high ecosystem productivity, their effects on forest diversity are greatly debated. Legumes can reduce local diversity because of the fertilization effect; however, they can also facilitate species coexistence through complementary resource utilization. 2. In natural forests, nitrogen requirements and biological nitrogen fixation (BNF) vary widely among legumes. We used leaf nitrogen isotopic composition to differentiate the level of BNF activity among seven legumes across a steep gradient of soil available nitrogen within a 60-ha stem-mapping plot in a montane tropical rainforest in Hainan Island, China, and we evaluated their spatial distribution and neighbourhood diversity. 3. Results show that the levels of BNF activity are tightly correlated with legume association to available soil nitrogen, where legumes associated with nitrogen-rich habitats exhibit surprisingly greater BNF activity and a more diverse neighbourhood. 4. Synthesis. These findings indicate that legumes satisfy their nitrogen-demanding metabolism through a synergy of habitat preference and BNF activity. High BNF activity drives local diversity by promoting complementary resource utilization rather than intensifying above-ground competition. This may be achieved by improving litter quality and stimulating mycorrhizal and microbial diversity. The abundance of nitrogen fixers in nitrogen-rich habitats also explains how legumes contribute to maintaining high levels of soil nitrogen in tropical forests.