不同土地利用类型下丛枝菌根真菌降低农牧交错带NH3排放

IF 5.2 2区 农林科学 Q1 SOIL SCIENCE
Huaisong WANG , Rui GUO , Yibo TIAN , Nan CUI , Xinxin WANG , Lei WANG , Zhongbao YANG , Shuying LI , Jixun GUO , Lianxuan SHI , Tao ZHANG
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引用次数: 0

摘要

氨(NH3)排放作为最重要的氮(N)损失形式,总是诱发一系列环境问题,如区域雾霾污染频率增加、氮沉积加速和氮富营养化。丛枝菌根(AM)真菌在氮循环中发挥着关键作用。然而,AM 真菌能否通过减少 NH3 排放来减轻氮的损失,目前还不清楚。本研究探讨了AM真菌在五种土地利用类型(放牧草地、割草草地、围栏草地、人工苜蓿草地和耕地)中减少NH3排放的潜在机制。结果表明,接种AM真菌能显著减少NH3的排放,而土地利用类型决定了菌根对NH3排放的响应。结构方程模型(SEM)表明,AM 真菌和土地利用类型直接影响 NH3 的排放。此外,氨氧化古细菌(AOA)amoA 和细菌(AOB)amoB 基因丰度、脲酶活性以及植物对氮的吸收量的增加在很大程度上推动了土壤 NH4+-N 和 pH 值的下降,而氨氧化古细菌接种和土地利用类型又诱导了 NH3 排放量的减少。本研究结果强调,应考虑减少土地利用类型变化导致的农业集约化对AM真菌的负面影响,以减少农业和草地生态系统中的氮损失。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Arbuscular mycorrhizal fungi reduce ammonia emissions under different land-use types in agro-pastoral areas

Ammonia (NH3) emissions, the most important nitrogen (N) loss form, always induce a series of environmental problems such as increased frequency of regional haze pollution, accelerated N deposition, and N eutrophication. Arbuscular mycorrhizal (AM) fungi play key roles in N cycling. However, it is still unclear whether AM fungi can alleviate N losses by reducing NH3 emissions. The potential mechanisms by which AM fungi reduce NH3 emissions in five land-use types (grazed grassland, mowed grassland, fenced grassland, artificial alfalfa grassland, and cropland) were explored in this study. Results showed that AM fungal inoculation significantly reduced NH3 emissions, and the mycorrhizal responses of NH3 emissions were determined by land-use type. Structural equation modeling (SEM) showed that AM fungi and land-use type directly affected NH3 emissions. In addition, the reduction in NH3 emissions was largely driven by the decline in soil NH4+-N and pH and the increases in abundances of ammonia-oxidizing archaea (AOA) amoA and bacteria (AOB) amoB genes, urease activity, and plant N uptake induced by AM fungal inoculation and land-use type. The present results highlight that reducing the negative influence of agricultural intensification caused by land-use type changes on AM fungi should be considered to reduce N losses in agriculture and grassland ecosystems.

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来源期刊
Pedosphere
Pedosphere 环境科学-土壤科学
CiteScore
11.70
自引率
1.80%
发文量
147
审稿时长
5.0 months
期刊介绍: PEDOSPHERE—a peer-reviewed international journal published bimonthly in English—welcomes submissions from scientists around the world under a broad scope of topics relevant to timely, high quality original research findings, especially up-to-date achievements and advances in the entire field of soil science studies dealing with environmental science, ecology, agriculture, bioscience, geoscience, forestry, etc. It publishes mainly original research articles as well as some reviews, mini reviews, short communications and special issues.
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