Effects of Nutrient Addition and Altered Precipitation on Soil Respiration on the Leymus secalinus Grassland in Northern Shanxi

doi:10.11733/j.issn.1007-0435.2025.01.019

Acta Agrestia Sinica ›› 2025, Vol. 33 ›› Issue (1): 170-180.DOI: 10.11733/j.issn.1007-0435.2025.01.019

Effects of Nutrient Addition and Altered Precipitation on Soil Respiration on the Leymus secalinus Grassland in Northern Shanxi

XU Wen-li^1,2,3, BIAN Jia-chen^1,2,3, LIN Mao^1,2,3, HAN Fei^1,2,3, YANG Qian-wen^1,2,3, LI Dong-xu^1,2,3, NING Ya-nan^1,2,3, YI Li-kai^1,2,3, PANG Gao-liang^1,2,3, WANG Run-dong^1,2,3, ZHU Yi-chen^1,2,3, DONG Kuan-hu^1,2,3, WANG Chang-hui^1,2,3, DIAO Hua-jie^1,2,3

1. College of Grassland Science, Shanxi Agricultural University, Taigu, Shanxi Province 030801, China;
2. Shanxi Key Laboratory of Grassland Ecological Protection and Native Grass Germplasm Innovation, Taigu, Shanxi Province 030801, China;
3. Youyu Plateau Grassland Ecosystem Research Station, Shanxi Agricultural University, Youyu, Shanxi Province 037200, China

Received:2024-04-29 Revised:2024-08-21 Published:2025-01-22

晋北赖草草地土壤呼吸对养分添加和改变降水的响应

许雯丽^1,2,3, 卞嘉琛^1,2,3, 林茂^1,2,3, 韩菲^1,2,3, 杨倩雯^1,2,3, 李东旭^1,2,3, 宁亚楠^1,2,3, 伊李凯^1,2,3, 庞高亮^1,2,3, 王润东^1,2,3, 朱熠辰^1,2,3, 董宽虎^1,2,3, 王常慧^1,2,3, 刁华杰^1,2,3

1. 山西农业大学草业学院, 山西太谷 030801;
2. 草地生态保护与乡土草种质创新山西省重点实验室, 山西太谷 030801;
3. 山西右玉黄土高原草地生态系统国家定位观测研究站, 山西右玉 037200

通讯作者: 刁华杰，E-mail：huajie0933@163.com
作者简介:许雯丽（1999-）,女,汉族,内蒙古巴彦淖尔人,硕士研究生,主要从事草地生态与管理研究,E-mail：xwl15104789232@163.com
基金资助:
山西省基础研究项目（202203021212420）；国家自然科学基金（32301375,U22A20576）；山西省优秀博士来晋工作科研项目（SXBYKY2022101）；山西农业大学科技创新基金项目（2022BQ05）资助

Abstract

Abstract: Soil respiration is the second largest ecosystems carbon flux in terrestrial ecosystems, which affects the carbon balance of ecosystems. However, the effects of nutrient addition, precipitation alteration and their interactions on soil autotrophic respiration （Ra） and soil heterotrophic respiration （Rh） are still unclear. In order to explore the influencing mechanism of nutrient addition and precipitation-altering interactions on soil respiration, we set up an experimental platform with nitrogen, phosphorus and potassium + altered precipitation in the typical agro-pastoral ecotone grassland of Shanxi. The deep-shallow ring method was used to distinguish Ra and Rh, and the biotic and abiotic factors was also measured. The results showed that nutrient addition combined increase of 50% precipitation significantly increased soil total respiration （Rs）, soil autotrophic respiration and the cumulative CO₂ emissions. There was a positive correlation between Ra and plant productivity and soil temperature. Rh was positively correlated with oil temperature, while negatively with microbial biomass nitrogen. The result of structural equation model showed that soil pH and soil NO₃^--N indirectly regulate the effects of nutrient addition and precipitation alteration on soil respiration. In conclusion, with the global climate change, we should not only consider the individual effects of nutrient addition or precipitation changes, but also integrate the effects of multiple factors of global change.

Key words: Soil respiration, Nutrient addition, Altered precipitation, Leymus secalinus grassland

摘要： 土壤呼吸是陆地生态系统的第二大碳通量,其微小的变化都会影响生态系统碳平衡。然而,养分添加和改变降水的交互作用对草地生态系统土壤自养呼吸（Ra）和土壤异养呼吸（Rh）的影响尚不明确。本研究以晋北赖草草地为研究对象,依托氮磷钾添加+增减雨试验平台,采用深-浅环法区分Ra和Rh,结合相关生物和非生物因子,探究养分添加、改变降水及其交互作用对Ra和Rh的影响和机制。结果表明：养分添加+增加50%降水处理显著提高土壤总呼吸（Rs）、Ra和土壤CO₂累积排放量；Ra与植物生产力和土壤温度呈正相关；而Rh与土壤温度呈正相关,与微生物生物量氮呈负相关；结构方程模型分析表明土壤pH和土壤NO₃^--N间接调控养分添加和改变降水对土壤呼吸的影响。本研究强调了在全球气候变化背景下不能仅考虑养分添加或降水变化的单独效应,更要综合全球变化多因子的影响。

关键词: 土壤呼吸, 养分添加, 改变降水, 赖草草地

CLC Number:

S154.1

XU Wen-li, BIAN Jia-chen, LIN Mao, HAN Fei, YANG Qian-wen, LI Dong-xu, NING Ya-nan, YI Li-kai, PANG Gao-liang, WANG Run-dong, ZHU Yi-chen, DONG Kuan-hu, WANG Chang-hui, DIAO Hua-jie. Effects of Nutrient Addition and Altered Precipitation on Soil Respiration on the Leymus secalinus Grassland in Northern Shanxi[J]. Acta Agrestia Sinica, 2025, 33(1): 170-180.

许雯丽, 卞嘉琛, 林茂, 韩菲, 杨倩雯, 李东旭, 宁亚楠, 伊李凯, 庞高亮, 王润东, 朱熠辰, 董宽虎, 王常慧, 刁华杰. 晋北赖草草地土壤呼吸对养分添加和改变降水的响应[J]. 草地学报, 2025, 33(1): 170-180.

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Effects of Nutrient Addition and Altered Precipitation on Soil Respiration on the Leymus secalinus Grassland in Northern Shanxi

晋北赖草草地土壤呼吸对养分添加和改变降水的响应

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