Soil properties and fungal community jointly explain N2O emissions following N and P enrichment in an alpine meadow

被引:5
作者
Lin, Zhenrong [1 ]
Shi, Lina [1 ]
Wei, Xiaoting [2 ]
Han, Bing [1 ]
Peng, Cuoji [1 ]
Yao, Zeying [1 ,3 ]
He, Yicheng [1 ]
Xiao, Qing [1 ]
Lu, Xinmin [4 ]
Deng, Yanfang [5 ]
Zhou, Huakun [6 ]
Liu, Kesi [1 ]
Shao, Xinqing [1 ]
机构
[1] China Agr Univ, Coll Grassland Sci & Technol, Beijing 100193, Peoples R China
[2] Chinese Acad Forestry, Inst Ecol Protect & Restorat, Beijing 100091, Peoples R China
[3] Gansu Agr Univ, Coll Practaculture, Lanzhou 730070, Peoples R China
[4] Tianshui Inst Pomol, Tianshui 741002, Peoples R China
[5] Qinghai Serv Guarantee Ctr, Qilian Mt Natl Pk, Xining 810001, Peoples R China
[6] Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Restorat Ecol Cold Area Qinghai Prov, Xining 810001, Peoples R China
基金
中国国家自然科学基金;
关键词
N2O emissions; N and/or P enrichment; Soil properties; Microbial community; Alpine meadow; GREENHOUSE-GAS EMISSIONS; NITROUS-OXIDE EMISSIONS; PHOSPHORUS ADDITION; DENITRIFICATION; FOREST; DIVERSITY; METAANALYSIS; BACTERIAL; MOISTURE; PATHWAYS;
D O I
10.1016/j.envpol.2024.123344
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Nutrient enrichment, such as nitrogen (N) and phosphorus (P), typically affects nitrous oxide (N2O) emissions in terrestrial ecosystems, predominantly via microbial nitrification and denitrification processes in the soil. However, the specific impact of soil property and microbial community alterations under N and P enrichment on grassland N2O emissions remains unclear. To address this, a field experiment was conducted in an alpine meadow of the northeastern Qinghai -Tibetan Plateau. This study aimed to unravel the mechanisms underlying N and P enrichment effects on N2O emissions by monitoring N2O fluxes, along with analyzing associated microbial communities and soil physicochemical properties. We observed that N enrichment individually or in combination with P enrichment, escalated N2O emissions. P enrichment dampened the stimulatory effect of N enrichment on N2O emissions, indicative of an antagonistic effect. Structural equation modeling (SEM) revealed that N enrichment enhanced N2O emissions through alterations in fungal community composition and key soil physicochemical properties such as pH, ammonium nitrogen (NH4+-N), available phosphorus (AP), microbial biomass carbon (MBC), and microbial biomass nitrogen (MBN)). Notably, our findings demonstrated that N2O emissions were significantly more influenced by fungal activities, particularly genera like Fusarium, rather than bacterial processes in response to N enrichment. Overall, the study highlights that N enrichment intensifies the role of fungal attributes and soil properties in driving N2O emissions. In contrast, P enrichment exhibited a nonsignificant effect on N2O emissions, which highlights the critical role of the fungal community in N2O emissions responses to nutrient enrichments in alpine grassland ecosystems.
引用
收藏
页数:9
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