AMF及短期增温增雨互作对植物吸收氮磷功能的影响

为研究气候变化是否影响植物-真菌共生关系及植物的吸收功能，本试验以青藏草原优势植物垂穗披碱草（Elymus nutans）和草地早熟禾（Poa pratensis）为研究对象，选取管柄囊霉属（Funneliformis）丛枝菌根真菌（Arbuscular mycorrizal fungi，AMF）进行室内控制试验。结果表明：增温促进了AMF和植物的共生，接种AMF及短期增温增雨互作对植物吸收氮磷功能的影响并不一致。对垂穗披碱草而言，增温增雨对其生长的土壤pH、全氮和有效磷含量均无显著影响，增雨促进了植物磷吸收（P<0.05），增温处理下接种AMF提高了植物氮磷含量（P<0.05）；对草地早熟禾而言，增温增雨提高了植物氮磷含量和土壤电导率、降低了土壤全氮含量（P<0.05），增温提高了土壤有效磷含量（P<0.05），增雨处理下接种AMF后降低了植物氮磷含量（P<0.05）。

Effects of AMF Inoculation,Short-term Warming and Increasing Precipitation on Nitrogen and Phosphorus Absorption of Plant

In order to know whether climate change affect plant and fungus symbiotic relationship and absorption function of the plant,dominant plants in qinghai-tibet plateau grassland Elymus nutans and Poa pratensis were selected in this study,and Funneliformis was inoculated in an artificial climate chamber. Results showed that:warming promoted the symbiosis between AMF and plants,different plants responded differently to short-term warming and increasing precipitation in terms of nitrogen and phosphorus absorption. For Elymus nutans,increasing precipitation (P) promoted the uptake of phosphorus significantly (P<0.05),and warming plus increasing precipitation (WP) had no effects on soil pH,total nitrogen or available phosphorus content,moreover,inoculating AMF under warming treatment (W) increased plant's nitrogen and phosphorus content (P<0.05). For Poa pratensis,WP treatment increased plant's N and P content and soil electrical conductivity,decreasing soil total N content (P<0.05),and W treatment increased soil available P content (P<0.05),moreover,inoculating AMF decreased plant's N and P content under P treatment (P<0.05).