Ren Haiyan, Gao Tao, Hu Jian, Yang Gaowen
College of Agro-Grassland Science, Nanjing Agricultural University, Nanjing, China.
PeerJ. 2017 Dec 20;5:e4183. doi: 10.7717/peerj.4183. eCollection 2017.
Understanding the factors that alter competitive interactions and coexistence between plants is a key issue in ecological research. A pot experiment was conducted to test the effects of root interaction and arbuscular mycorrhizal fungi (AMF) inoculation on the interspecies competition between and under different proportions of mixed sowing by the combination treatment of two levels of AMF inoculation (inoculation and non-inoculation) and two levels of root interaction (root interaction and non-root interaction). Overall, the aboveground and belowground biomass of and were not altered by AMF inoculation across planting ratios, probably because the fertile soil reduced the positive effect of AMF on plant growth. Both inter- and intraspecies root interaction significantly decreased the aboveground biomass of , but tended to increase the aboveground biomass of across planting ratios, and thus peaked at the 4:4 polyculture. These results showed that competed poorly with because of inter and intraspecies root interaction. Our results indicate that interspecies root interaction regulates the competitive ability of grass and legume in mixtures and further makes great contribution for overyielding. Furthermore, AMF may not be involved in plant-plant interaction in fertile condition.
了解改变植物间竞争相互作用和共存的因素是生态学研究中的一个关键问题。进行了一项盆栽试验，通过两种丛枝菌根真菌（AMF）接种水平（接种和不接种）和两种根系相互作用水平（根系相互作用和非根系相互作用）的组合处理，来测试根系相互作用和AMF接种对不同混播比例下[植物名称1]和[植物名称2]种间竞争的影响。总体而言，在不同种植比例下，AMF接种并未改变[植物名称1]和[植物名称2]的地上和地下生物量，这可能是因为肥沃土壤降低了AMF对植物生长的积极影响。种间和种内根系相互作用均显著降低了[植物名称1]的地上生物量，但在不同种植比例下往往会增加[植物名称2]的地上生物量，因此在4:4混播时达到峰值。这些结果表明，由于种间和种内根系相互作用，[植物名称1]与[植物名称2]竞争能力较差。我们的结果表明，种间根系相互作用调节了混播中禾本科植物[植物名称1]和豆科植物[植物名称2]的竞争能力，并进一步对超产做出了巨大贡献。此外，在肥沃条件下，AMF可能不参与植物间相互作用。
