深根沙漠物种根瘤噬菌体所介导的土壤磷比例由细根特征决定

IF 4.6 1区环境科学与生态学 Q1 ECOLOGY

Functional Ecology Pub Date : 2024-08-12 DOI:10.1111/1365-2435.14635

Yanju Gao, Akash Tariq, Fanjiang Zeng, Jordi Sardans, Dhafer A. Al-Bakre, Josep Peñuelas

引用次数: 0

摘要

土壤磷（P）的可用性是决定陆地生态系统初级生产力的关键因素。缺磷条件下的植物功能特性和微生物可以做出积极反应，提高土壤中磷的生物利用率。然而，深根沙漠物种的细根性状（FRTs）是否和/或如何影响根瘤菌圈和土壤中的噬菌体群落，从而改善土壤钾的可利用性，目前仍不清楚。为了填补这一空白，我们利用 Alhagi sparsifolia Shap.（以下简称 Alhagi）进行了为期三年的人工室外盆栽钾供应实验。我们采集了 1 年生和 3 年生 Alhagi 幼苗的细根样本以及根瘤和块状土壤样本。通过高通量测序、连续提取和根系扫描，确定了土壤 phoD-harbouring 细菌群落、Hedley-P 分馏物和 FRTs。与高磷供应条件相比，无磷供应条件下的细根表面积（RSA）、比根长、叶面锰浓度（表明根部羧酸盐的释放量）和酸性磷酸酶（APase）活性都显著较高。3 年生幼苗的酸性磷酸酶活性比 1 年生幼苗高 27%，但叶面锰浓度却比 1 年生幼苗低 26%。在无磷酸盐供应条件下，3 年生幼苗根瘤中的可溶性磷酸盐、中度可溶性磷酸盐、无机磷酸盐和有机磷酸盐浓度分别比 1 年生幼苗高 5%、11%、10% 和 21%。RSA 和叶面锰浓度是 1 年生幼苗根瘤菌群落 phoD-harbouring 细菌群落的主要根部预测因子，而细根 P 浓度是 3 年生幼苗根瘤菌群落和土壤中大量 phoD-harbouring 细菌群落的主要根部预测因子。土壤含水量作为驱动 phoD-有害细菌群落变化的最主要土壤因子，其作用不容忽视。FRTs是直接正向决定根瘤菌群落并进而影响土壤钾供应的主要因素，但大体积土壤噬菌体群落受无机钾浓度的支配。随着植物的生长，细根形态特征对土壤钾供应的重要性逐渐增加。总之，我们的研究结果强调了根瘤层 phoD-有害细菌对土壤钾的生物利用率的重要意义，而根瘤层 phoD-有害细菌是由 FRTs 对土壤钾的生物利用率的影响决定的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Fractions of soil phosphorus mediated by rhizospheric phoD-harbouring bacteria of deep-rooted desert species are determined by fine-root traits

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Fractions of soil phosphorus mediated by rhizospheric phoD-harbouring bacteria of deep-rooted desert species are determined by fine-root traits

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来源期刊

Functional Ecology 环境科学-生态学

CiteScore

9.00

自引率

1.90%

发文量

243

审稿时长

4 months

期刊介绍： Functional Ecology publishes high-impact papers that enable a mechanistic understanding of ecological pattern and process from the organismic to the ecosystem scale. Because of the multifaceted nature of this challenge, papers can be based on a wide range of approaches. Thus, manuscripts may vary from physiological, genetics, life-history, and behavioural perspectives for organismal studies to community and biogeochemical studies when the goal is to understand ecosystem and larger scale ecological phenomena. We believe that the diverse nature of our journal is a strength, not a weakness, and we are open-minded about the variety of data, research approaches and types of studies that we publish. Certain key areas will continue to be emphasized: studies that integrate genomics with ecology, studies that examine how key aspects of physiology (e.g., stress) impact the ecology of animals and plants, or vice versa, and how evolution shapes interactions among function and ecological traits. Ecology has increasingly moved towards the realization that organismal traits and activities are vital for understanding community dynamics and ecosystem processes, particularly in response to the rapid global changes occurring in earth’s environment, and Functional Ecology aims to publish such integrative papers.