红壤坡地杂草群落VA菌根真菌的宿主物种调查

本研究调查了红壤坡地幼龄果园杂草群落的物种多样性以及主要物种被VA菌根真菌的侵染率和侵染强度，分析了VA菌根真菌侵染与根际土壤磷系水平的关系。研究区域幼龄果园杂草群落共有杂草96种，分属27科。对17个科的39个物种的调查发现，所调查的物种均不同程度上被VA真菌所侵染，但科与科之间存在显著差异，同一科的不同种之间也差异明显。相关分析表明，VA菌根真菌对不同毁草种 的侵染率和侵染强度与土壤磷素水平关系不甚密切，VA菌根真菌强度可能主要决定于宿主植物特性和VA菌根真菌的选择。因此，在不影响农业生产的前提下，尽可能保持杂草的多样性将有利于VA菌根真菌的生存。

Investigation on hostplants of vesicular arbuscular mycorrhiza fungi (VAMF) within weed communities inagricultural slope land in the red soil area of southeastern China

An investigation on weed species biodiversity and host plants of vesicular arbuscular mycorrhiza fungi (VAMF) within weed communities in new developed fruit gardens was conducted. Phosphorus content in various weed rhizospheric soils was analysed. There were 96 species belonging to 27 families in the weed community,among which 39 species were tested to identify VAMF colonies. It was found that all the species tested were colonized by VAMF, but the percentage of colonization and the colonizing intensity were very different among the families and species. Correlation analyses showed that no significant correlation exists between phosphorus content in rhizospheric soil and VAMF colonization. VAMF colonization mainly depends on the characteristics of host plants and the selection of VAMF. This suggests that conservation of weed diversity in upland ecosystems will be favorable for conserving VAMF activities and diversity.