Partitioning of soil phosphorus among arbuscular and ectomycorrhizal trees in tropical and subtropical forests
Partitioning of soil phosphorus among arbuscular and ectomycorrhizal trees in tropical and subtropical forests
复制标题
DOI：
10.1111/ele.12939
复制
发表时间：
2018-05-01
期刊：
影响因子：
8.8
通讯作者：
Johnson, David
中科院分区：
文献类型：
--
作者：
Liu, Xubing;Burslem, David F. R. P.;Johnson, David
土壤磷库的分配被认为是维持植物多样性的关键机制，但缺乏实验支持。在这里，我们提供了不同的化学形式的P，以15个树种与对比的根共生关系，调查植物P收购在热带和亚热带森林。外生菌根（ECM）和丛枝菌根（AM）的树木积极响应除了无机磷，但引人注目的是，ECM树木获得更多的P从一个复杂的有机形式（植酸）。大多数ECM树种和所有AM树种也表现出一定的能力，采取简单的有机磷（单磷酸盐）。菌根定殖与土壤可提取磷浓度呈负相关，表明菌根真菌可能调节树种之间的有机磷获取。我们的研究结果支持这一假设，ECM和AM植物分区土壤磷源，这可能在促进物种共存在热带和亚热带森林生态学上发挥重要作用。
Partitioning of soil phosphorus (P) pools has been proposed as a key mechanism maintaining plant diversity, but experimental support is lacking. Here, we provided different chemical forms of P to 15 tree species with contrasting root symbiotic relationships to investigate plant P acquisition in both tropical and subtropical forests. Both ectomycorrhizal (ECM) and arbuscular mycorrhizal (AM) trees responded positively to addition of inorganic P, but strikingly, ECM trees acquired more P from a complex organic form (phytic acid). Most ECM tree species and all AM tree species also showed some capacity to take up simple organic P (monophosphate). Mycorrhizal colonisation was negatively correlated with soil extractableP concentration, suggesting that mycorrhizal fungi may regulate organic P acquisition among tree species. Our results support the hypothesis that ECM and AM plants partition soil P sources, which may play an ecologically important role in promoting species coexistence in tropical and subtropical forests.