Abstract

How arbuscular mycorrhizal (AM) fungi affect litter nutrient release and soil properties in the nutrient-deficient karst soil, is unclear. An experiment was conducted in this study using a dual compartment device composed of a planting compartment (for the Cinnamomum camphora seedlings with or without Funneliformis mosseae fungus) and a litter compartment (with or without the litter of Arthraxon hispidus). The center baffle between the compartments was covered with a double layer of 20-µm or 0.45-µm nylon mesh, which controlled the entrance of AM mycelium into the litter compartment. The results are as follows: AM mycelium significantly increased the mass loss and carbon and nitrogen releases and decreased the nitrogen concentration in the litter. AM mycelium could significantly increase soil organic carbon, total nitrogen and availability of phosphorus during litter decomposition in the litter compartment. Redundancy analysis showed that the effect of AM mycelium on the soil organic carbon, total nitrogen in the litter compartment was closely associated with the increase in carbon and nitrogen release from litter. It was concluded that AM mycelium can enhance litter decomposition and nutrient releases, contributing to greater nutrient input to the soil and then subsequently higher soil organic carbon and nutrient content in the nutrient-poor karst soils.

STATEMENT OF NOVELTY

This study firstly estimated the impacts of arbuscular mycorrhizal fungi on litter nutrient releases and soil properties through root external mycelium

摘要

丛枝菌根 (AM) 真菌如何影响营养缺乏的喀斯特土壤中的凋落物养分释放和土壤性质，尚不清楚。本研究中使用双隔室装置进行了一项实验，该装置由种植隔室（用于带有或不带有 Funneliformis mosseae真菌的Cinnamomum camphora幼苗）和一个枯枝落叶室（带有或不包含Arthraxon hispidus枯枝落叶）组成。）。隔间之间的中心挡板覆盖有双层 20-μm 或 0.45-μm 尼龙网，控制 AM 菌丝体进入垃圾隔间。结果如下：AM菌丝体显着增加了质量损失和碳和氮的释放，并降低了凋落物中的氮浓度。AM菌丝体可以显着增加凋落物分解过程中土壤有机碳、总氮和磷的有效性。冗余分析表明，AM菌丝体对凋落物间土壤有机碳、总氮的影响与凋落物碳氮释放量的增加密切相关。得出的结论是，AM 菌丝体可以促进凋落物分解和养分释放，

新颖性声明

本研究首次通过根外菌丝体估计了丛枝菌根真菌对凋落物养分释放和土壤性质的影响。