干旱区生态环境知识资源中心(Arid): Variations in the nitrogen saturation threshold of soil respiration in grassland ecosystems

Arid

DOI	10.1007/s10533-020-00661-y
	Variations in the nitrogen saturation threshold of soil respiration in grassland ecosystems
	Wang, Chao 1,2; Ren, Fei 3; Zhou, Xuhui 4; Ma, Wenhong 5; Liang, Cunzhu 5; Wang, Jinzhou 1,2; Cheng, Jianwei 5; Zhou, Huakun 3; He, Jin-Sheng 1,2,6,7
通讯作者	He, Jin-Sheng
来源期刊	BIOGEOCHEMISTRY
ISSN	0168-2563
EISSN	1573-515X
出版年	2020
卷号	148 期号:3 页码:311-324
英文摘要	Over the last century, anthropogenic activities have increased nitrogen (N) deposition considerably, which significantly affects ecosystem processes and has the potential to induce N saturation in the future. The continuous increase in N deposition may cause a non-linear response in soil respiration (Rs), an important component of carbon (C) cycling. However, little is known about N saturation threshold of soil respiration. In this study, we conducted coordinated experiments in four grassland types across northern China with four N addition levels to explore patterns in the Rs saturation threshold. Our results showed that an Rs saturation threshold generally exists in grassland ecosystems in response to N addition gradients. The N saturation threshold of Rs occurred at an average rate of 50 kg N ha(-1) yr(-1), but varied widely with grassland type; the N saturation threshold occurred at rates of 100, 50, 50, and 25 kg N ha(-1) yr(-1) in the alpine meadow, meadow steppe, typical steppe, and desert steppe, respectively. Autotrophic respiration (Ra) and heterotrophic respiration (Rh) responded to N addition gradients differently. Ra increased initially and became saturated at a rate of 50 kg N ha(-1) yr(-1) and declined thereafter. In contrast, Rh decreased monotonically after N addition. Structural equation models further confirmed that the effects of N addition gradients on Rs were primarily determined by the non-linear response of belowground biomass. Interestingly, the compiled global dataset showed that the N saturation threshold of Rs increased with precipitation and soil moisture. These findings indicate that the stimulating effect of N deposition on Rs and Ra might diminish with increasing N deposition in the future, especially in dry grassland ecosystems.
英文关键词	Carbon cycling Nitrogen deposition Coordinated experiments Threshold Precipitation
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000527492300001
WOS关键词	MICROBIAL COMMUNITIES ; INNER-MONGOLIA ; RESPONSES ; BIOMASS ; PRODUCTIVITY ; TEMPERATURE ; COMPONENTS ; VEGETATION ; CHINA ; FERTILIZATION
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Geology
来源机构	兰州大学 ; 北京大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/314171
作者单位	1.Peking Univ, Coll Urban & Environm Sci, Dept Ecol, Beijing 100871, Peoples R China; 2.Peking Univ, Minist Educ, Key Lab Earth Surface Proc, Beijing 100871, Peoples R China; 3.Chinese Acad Sci, Northwest Inst Plateau Biol, Key Lab Restorat Ecol Cold Reg Qinghai Prov, 23 Xinning Rd, Xining 810008, Peoples R China; 4.East China Normal Univ, Sch Ecol & Environm Sci, Ctr Global Change & Ecol Forecasting, Shanghai Key Lab Urban Ecol Proc & Ecorestorat, 500 Dongchuan Rd, Shanghai 200241, Peoples R China; 5.Inner Mongolia Univ, Sch Ecol & Environm, Key Lab Grassland Ecol, Hohhot 010021, Peoples R China; 6.Lanzhou Univ, State Key Lab Grassland Agroecosyst, Lanzhou 730000, Gansu, Peoples R China; 7.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Chao,Ren, Fei,Zhou, Xuhui,et al. Variations in the nitrogen saturation threshold of soil respiration in grassland ecosystems[J]. 兰州大学, 北京大学,2020,148(3):311-324.
APA	Wang, Chao.,Ren, Fei.,Zhou, Xuhui.,Ma, Wenhong.,Liang, Cunzhu.,...&He, Jin-Sheng.(2020).Variations in the nitrogen saturation threshold of soil respiration in grassland ecosystems.BIOGEOCHEMISTRY,148(3),311-324.
MLA	Wang, Chao,et al."Variations in the nitrogen saturation threshold of soil respiration in grassland ecosystems".BIOGEOCHEMISTRY 148.3(2020):311-324.