文献类型：期刊文献

英文题名：Plant neighbor effects mediated by rhizosphere factors along a simulated aridity gradient

作者：Yang, Haishui[1] Yu, Zhenxing[1] Zhang, Qian[1,2] Tang, Jianjun[1] Chen, Xin[1]

第一作者：Yang, Haishui

通信作者：Chen, X[1]

机构：[1]Zhejiang Univ, Coll Life Sci, Hangzhou 310058, Zhejiang, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China

年份：2013

卷号：369

期号：1-2

起止页码：165-176

外文期刊名：PLANT AND SOIL

收录：;Scopus(收录号：2-s2.0-84880770678);WOS:【SCI-EXPANDED(收录号:WOS:000321642200014)】；

基金：This work was supported by the National Natural Science Foundation of China (NSFC, No. 31070389, 30870405) and the Key Laboratory of Ministry of Agriculture of the People's Republic of China (No. KYJD09021).

语种：英文

外文关键词：Plant-plant interaction; Arbuscular mycorrhizal fungi; Medicago sativa L. water availability; Belowground interaction

摘要：We investigated how rhizosphere factors (total rhizosphere, roots, arbuscular mycorrhizal fungal hyphae [AMF], and soil solution) and water availability affect interactions between neighboring Medicago sativa plants. A three-compartment mesocosm was used to test the effects of rhizosphere factors on plant-plant interactions. A relative interaction index (RII) was calculated to indicate whether effects of neighbor plant on target plant were positive or negative (facilitative or competitive). Isotope tracers were used to test whether AMF hyphae mediated competition for nitrogen (N) between target and neighbor plants. The effects of rhizosphere factors on the interactions between neighboring M. sativa plants depended on water availability. The effects of total rhizosphere shifted RII from negative to positive as water availability increased. Interaction with the roots and rhizosphere soil solution of neighbor plants shifted RII from negative to positive as water availability increased but the opposite was true for AMF hyphae. AMF hyphae helped neighbor plants compete for N-15 when water was available but not when water was limiting. The effect of total rhizosphere on plant-plant interaction of M. sativa shifted from competitive to facilitative as water availability increased. Competition was reduced by neighboring soil solution and roots but was increased by AMF hyphae.