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本文采用三室隔网盆栽试验方法,选择三种土壤容重(1.3;1.6;1.8g/cm~3)来模拟自然条件下不同紧实度对植物根系生长的抑制情况,探讨了接种VA菌根真菌G·mosseae对三叶草植株生长和对土壤磷吸收的影响。结果表明随着土壤容重的增加,三叶草根系生长受到抑制的程度随之加重。当土壤容重为1.8g/cm~3时,根系基本不能生长,而菌丝却能在其中伸展并吸收养分。表现为1.8土壤容重的处理菌根植物的含磷量明显高于无菌根植物。而在低容重的处理中两者却没有显著差异。说明VA菌根真菌能缓解甚至消除土壤机械阻力对植物生长的胁迫。
In this paper, the three-compartment netted pot experiment was used to select three kinds of soil bulk density (1.3; 1.6; 1.8g / cm ~ 3) to simulate the inhibition of plant root growth under different natural compaction conditions. Effects of G · mosseae on the growth of clover plants and their uptake of soil phosphorus. The results showed that with the increase of soil bulk density, the growth of clover roots inhibited the degree of aggravating. When the soil bulk density of 1.8g / cm ~ 3, the root can not grow basically, but mycelium can stretch and absorb nutrients in it. The performance of soil bulk density of 1.8 mycorrhizal plant phosphorus content was significantly higher than the aseptic roots. However, there was no significant difference between the two treatments at low bulk density. VA mycorrhizal fungi can alleviate or even eliminate the resistance of soil mechanical resistance to plant growth stress.