VA菌根对喀斯特草本群落植物根际养分影响研究

Effects of VA mycorrhiza on rhizosphere nutrient of the herb community in Karst area

以贵州花江喀斯特高原生态综合治理试验示范区内草本群落阶段的几种主要植物为材料,对其根际微生态环境进行了研究,包括根际土壤化学性质、土壤酶活性和VA菌根侵染率及AMF孢子密度。结果表明:VA菌根侵染率和根际土壤中AMF孢子密度存在极显著正相关,相关系数达到0.97;不同植物根际土壤的化学指标和土壤酶活性均表现出较强的根际效应,即R/S>1;VA菌根侵染率与pH值存在显著负相关,与有效磷质量分数存在极显著正相关,与碱性磷酸酶存在显著正相关,说明VA菌根能够促进土壤中难溶态磷往有效磷方向转化;AMF对宿主植物的侵染能够在一定程度上改善根际微生态环境的营养状况。

Several chiefly plants of herb community were taken as our research material in the Ecological Synthesis Control demon-strated area in Huajiang Karst plateau of Guizhou province.We did the research on the rhizosphere microecology of the plants in-cluding the soil chemical properties,the soil enzyme activity,VA mycorrhizal infection rate and spore content of AMF.The results showed that：There was a significantly positively correlation between the VA mycorrhizal infection rate and the AMF spore concen-tration in rhizosphere soil,and the correlation coefficient between them could reach to 0.97;the different chemical indices and en-zyme activities of rhizosphere soil all showed strong rhizosphere effect,the R/S of them were all beyond 1;there was a significant negative correlation between the VA mycorrhizal infection rate and the pH value,and the VA mycorrhizal infection rate had signifi-cant positive correlation with the available phosphorus and the the alkaline phosphatase respectively,which illustrated that the VA mycorrhiza can accelerate the conversion between labile soil phosphorus and available phosphorus,the AMF infection of the host plant can improve the nutritional status of rhizosphere microbial environment to a certain degree.