Plant and soil's delta N-15 are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau

doi:10.1016/j.agee.2019.05.011

	Plant and soil's delta N-15 are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau
	Wu, Jianshuang 4,5,7; Song, Minghua 2; Ma, Weiling 4; Zhang, Xianzhou 4; Shen, Zhenxi 4; Tarolli, Paolo 6; Wurst, Susanne 3; Shi, Peili 4; Ratzmann, Gregor 5; Feng, Yunfei 4
刊名	AGRICULTURE ECOSYSTEMS & ENVIRONMENT
	2019-09-01
卷号	281 页码:111-123
关键词	Alpine vegetation Climatic gradients Ecosystem N cycling Nitrogen isotopic composition Plant functional traits Tibetan Plateau
ISSN号	0167-8809
DOI	10.1016/j.agee.2019.05.011
通讯作者	Wu, Jianshuang(wujs.07s@igsnr.ac.cn)
英文摘要	Nitrogen (N) cycling is a critical pathway by which producer, consumer, and decomposer interact with each other and with environmental circumstances simultaneously. The natural abundance composition of N-15/N-14 in plants and soils (termed as delta N-15(plant) and delta N-15(soil)), as well as the difference between them (delta N-15(soil-to-plant) = delta N-15(plant)-delta N-15(soil)), is a useful tool for better understanding ecosystem N cycling. However, the drivers and mechanisms of ecosystem N cycling in alpine grasslands on the Tibetan Plateau are mostly unknown, especially across different grassland types at a regional scale. To fill this knowledge gap, we measured delta N-15(plant) (200 samples of top-dominant species) and delta N-15(soil) (85 samples of top-layer soils, 0-20 cm) at nine sites that represent zonal communities of alpine deserts, steppes, and meadows in North Tibet, and calculated the corresponding delta N-15(soil)-to-plant. Our results showed that delta N-15(plant), delta N-15(soil), and delta N-15(soil-to-plant) were significantly different among the three zonal grassland types (analysis of differences with non-parametric Kruskal Test, P < 0.05), with the lowest values in meadows and the highest values in deserts. Regression analyses showed that the delta N-15(plant), delta N-15(soil), and delta N-15(soil)-to-plant decreased with the increases of growing season precipitation (GSP) and habitat aridity index (Aridity), soil organic carbon (SOC) and soil total nitrogen (STN), plant species richness, Shannon diversity index, and plant community productivity, whereas increased with the increases of accumulated active temperature (AccT) and soil total phosphorus (STP) across alpine grassland types at the regional scale. Multiple linear models with analysis of covariance (ANCOVA) confirmed GSP to be the most critical driver, which alone explained most variances of delta N-15(plant) (56%), delta N-15(soil) (62%), and delta N-15(soil-to-plant) (35%). However, structural equation modeling performed better than multiple linear modeling in predicting delta N-15(plant) (76% vs. 66%) and worse in predicting delta N-15(soil) (79% vs. 84%) and delta N-15(soil-to-plant) (31% vs. 46%), likely due to the exclusion of collinear predictors and the removal of non-significant influencing paths. Overall, this study has highlighted the importance to uncover the complexity of climate, soil nutrients, and vegetation properties in networking to drive the different components of ecosystem N cycling in alpine grasslands on the Tibetan Plateau.
资助项目	Ministry of Science and Technology of China[2016YFC0502001] ; Ministry of Science and Technology of China[2016YFC0502005] ; Ministry of Science and Technology of China[2016YFC0501803] ; National Natural Science Foundation of China[41401070] ; National Natural Science Foundation of China[41571042] ; National Natural Science Foundation of China[41271067] ; National Natural Science Foundation of China[41761008] ; Chinese Academy of Sciences[XDB03030401] ; China Postdoctoral Science Foundation[2016M591242] ; Alexander von Humboldt Foundation
WOS关键词	N-15 NATURAL-ABUNDANCE ; MYCORRHIZAL FUNGI ; GLOBAL PATTERNS ; ISOTOPIC COMPOSITION ; PRIMARY PRODUCTIVITY ; NITROGEN DELTA-N-15 ; SEASONAL-VARIATION ; CARBON DELTA-C-13 ; GRAZING EXCLUSION ; FOLIAR DELTA-N-15
WOS研究方向	Agriculture ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000500208700012
资助机构	Ministry of Science and Technology of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; China Postdoctoral Science Foundation ; Alexander von Humboldt Foundation
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/130115]
专题	中国科学院地理科学与资源研究所
通讯作者	Wu, Jianshuang
作者单位	1.Xizang Agr & Anim Husb Coll, Dept Anim Sci, Linzhi 860000, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China 3.Berlin Brandenburg Inst Adv Biodivers Res BBIB, D-14195 Berlin, Germany 4.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Lhasa Natl Ecol Res Stn, Key Lab Ecosyst Network Observat & Modelling, Beijing 100101, Peoples R China 5.Free Univ Berlin, Inst Biol Biodivers Theoret Ecol, D-14195 Berlin, Germany 6.Univ Padua, Dept Land Environm Agr & Forestry, I-35020 Legnaro, PD, Italy 7.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Wu, Jianshuang,Song, Minghua,Ma, Weiling,et al. Plant and soil's delta N-15 are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau[J]. AGRICULTURE ECOSYSTEMS & ENVIRONMENT,2019,281:111-123.
APA	Wu, Jianshuang.,Song, Minghua.,Ma, Weiling.,Zhang, Xianzhou.,Shen, Zhenxi.,...&Tietjen, Britta.(2019).Plant and soil's delta N-15 are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau.AGRICULTURE ECOSYSTEMS & ENVIRONMENT,281,111-123.
MLA	Wu, Jianshuang,et al."Plant and soil's delta N-15 are regulated by climate, soil nutrients, and species diversity in alpine grasslands on the northern Tibetan Plateau".AGRICULTURE ECOSYSTEMS & ENVIRONMENT 281(2019):111-123.