Root and arbuscular mycorrhizal mycelial interactions with soil microorganisms in lowland tropical forest.
Root and arbuscular mycorrhizal mycelial interactions with soil microorganisms in lowland tropical forest.
复制标题
DOI：
10.1111/1574-6941.12096
复制
发表时间：
2013-07
影响因子：
4.2
通讯作者：
A. Nottingham;Benjamin L Turner;K. Winter;P. Chamberlain;A. Stott;E. Tanner
中科院分区：
文献类型：
--
作者：
A. Nottingham;Benjamin L Turner;K. Winter;P. Chamberlain;A. Stott;E. Tanner
热带森林具有很高的土壤碳循环率，但关于根、丛枝菌根真菌(AMF)和自由生活的微生物如何在这些生态系统中相互作用和影响有机质矿化的信息很少。我们利用磷脂脂肪酸生物标志物中的网状生长核心和同位素示踪剂，研究了根和AMF菌丝体对(1)大型盆栽热带树木的微生物群落组成、微生物碳利用和水解酶活性的影响；(2)低地热带森林中的酶活性和凋落物质量损失。在热带树下，植物来源的碳主要被并入根际和只有AMF的土壤中的细菌群中。革兰氏阳性细菌在根际土壤中吸收了额外的土壤碳，根际土壤中也含有最高的微生物生物量。在水解酶方面，β-葡萄糖苷酶和N-乙酰β-氨基葡萄糖苷酶活性在根际土壤中最高，而磷酸单酯酶活性在根际土壤中最高。在森林中，根部的存在增加了叶凋落物的质量损失，但仅有AMF菌丝体的存在并不增加。根-微生物的相互作用影响了有机质的循环，有证据表明根际启动和在有根的情况下加速了叶凋落物的分解。虽然单独的AMF菌丝体不能刺激有机质矿化，但它们是将碳输送到其他土壤微生物的管道。
Tropical forests have high rates of soil carbon cycling, but little information is available on how roots, arbuscular mycorrhizal fungi (AMF), and free-living microorganisms interact and influence organic matter mineralization in these ecosystems. We used mesh ingrowth cores and isotopic tracers in phospholipid fatty acid biomarkers to investigate the effects of roots and AMF mycelia on (1) microbial community composition, microbial carbon utilization, and hydrolytic enzyme activities for large, potted tropical trees and (2) enzyme activities and litter mass loss in a lowland tropical forest. Under the tropical tree, plant-derived carbon was incorporated predominantly into bacterial groups in both rhizosphere and AMF-only soils. Gram-positive bacteria incorporated additional soil-derived carbon in rhizosphere soils, which also contained the highest microbial biomass. For hydrolytic enzymes, β-glucosidase and N-acetyl β-glucosaminidase activities were highest in rhizosphere soils, while phosphomonoesterase activity was highest in AMF-only soil. In the forest, leaf litter mass loss was increased by the presence of roots, but not by the presence of AMF mycelia only. Root-microbial interactions influenced organic matter cycling, with evidence for rhizosphere priming and accelerated leaf litter decomposition in the presence of roots. Although AMF mycelia alone did not stimulate organic matter mineralization, they were a conduit of carbon to other soil microorganisms.