文献类型：期刊文献

英文题名：Autotoxicity of root exudates varies with species identity and soil phosphorus

作者：Sun, Zhen-Kai[1,2] He, Wei-Ming[1,3]

第一作者：孙振凯;Sun, Zhen-Kai

通信作者：He, WM[1];He, WM[2]

机构：[1]Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, Beijing 100091, Peoples R China;[3]Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China

年份：2019

卷号：28

期号：4

起止页码：429-434

外文期刊名：ECOTOXICOLOGY

收录：;Scopus(收录号：2-s2.0-85065642957);WOS:【SCI-EXPANDED(收录号:WOS:000467546400006)】；

基金：This work was supported by the Ministry of Science and Technology of the People's Republic of China (2017YFC1200102) and the National Natural Science Foundation of China (31570538).

语种：英文

外文关键词：Competition; Plant species identity; Root exudate autotoxicity; Soil P availability; Stoichiometry

摘要：Root exudate autotoxicity (i.e. root exudates from a given plant have toxic effects on itself) has been recognized to be widespread. Here we examined how plant species identity and soil phosphorus (P) availability influenced this autotoxicity and the possible stoichiometric mechanisms. We conducted an experiment with three species (Luctuca sativa, Sesbania cannabina, and Solidago canadensis), which were subject to four treatments consisting of activated carbon (AC) and soil P. AC addition increased the whole-plant biomass of each species under high P conditions and this AC effect varied strongly with species identity. For Solidago, the relative increase in whole-plant biomass due to AC addition was larger in the low P than in the high P. Root exudate autotoxicity differed between roots and shoots. AC addition decreased root N:P ratios but failed to influence shoot N:P ratios in three species. These findings suggest that soil P enrichment might mediate root exudate autotoxicity and that this P-mediated autotoxicity might be related to root N and P stoichiometry. These patterns and their implications need to be addressed in the context of plant communities. HighlightsRoot exudate autotoxicity varied with species identity and soil P.Root exudate autotoxicity differed between roots and shoots.P-mediated autotoxicity might be related to N:P ratios.