DOI: 10.1016/j.catena.2019.104332
论文题名: Effects of mowing and nitrogen addition on the ecosystem C and N pools in a temperate steppe: A case study from northern China
作者: Wang D. ; Chi Z. ; Yue B. ; Huang X. ; Zhao J. ; Song H. ; Yang Z. ; Miao R. ; Liu Y. ; Zhang Y. ; Miao Y. ; Han S. ; Liu Y.
刊名: Catena
ISSN: 3418162
出版年: 2020
卷: 185 语种: 英语
英文关键词: Carbon sequestration
; Nitrogen fertilization
; Plant C and N content
; Plant functional group
; Soil aggregation
; Temperate grassland
Scopus关键词: arid region
; belowground biomass
; carbon sequestration
; climate change
; experimental study
; fertilizer application
; gas exchange
; grassland
; land use change
; nitrogen cycle
; semiarid region
; soil aggregate
; steppe
; temperate environment
; Mongolian Plateau
; Mammalia
英文摘要: Grasslands, mostly in arid and semiarid regions, play an important role in regulating the dynamics of global terrestrial carbon (C) exchange. However, findings about how global changes affect ecosystem C sequestration are conflicting. To understand how land use and climate change affect ecosystem C and nitrogen (N) pools, this study investigated the effects of mowing and fertilizer on the C and N pools of plants and soil, and on the aggregate-associated C and N content, by means of a field manipulating experiment established in August 2012 in a typical steppe. The results showed that mowing significantly decreased the mass and the C and N pools of shoots by 14.3%, 17.3% and 12.1%, respectively. Compared to ambient N treatments, N addition stimulated shoot biomass and litter mass by 28.8% and 77.4%, respectively, but had no affect on root biomass. Simultaneously, N addition increased the plant N content and the N pools, and it decreased the ratio of plant C to N in the shoots, litter and roots. However, neither mowing nor N addition affected the proportion of macroaggregate, microaggregate, <0.053 mm size class, geometric mean diameter or aggregate-associated C and N contents. Nitrogen deposition under conditions of climate change stimulated plant productivity but had no affect on soil C sequestration in this short-term experiment. Our results indicate that mowing may be beneficial for providing food for large mammals, but it did not affect soil C and N pools in the study region. Our findings suggest that the response of plant mass and C pools is more sensitive than that of soil C sequestration and soil texture to mowing and N deposition in the temperate steppes of the Mongolian Plateau. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159595
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: International Joint Research Laboratory of Global Change Ecology, School of Life Sciences, Henan University, Kaifeng, Henan 475004, China; Upper and Middle Yellow River Bureau, Yellow River Conservancy Commission of the Ministry of Water Resources, Xi'an, 710021, China; School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, 450046, China; Appraisal Center for Environment & Engineering, Ministry of Ecology and Environment, Beijing, 100012, China; Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions, Ministry of Education, Henan University, Kaifeng, Henan 475004, China
Recommended Citation:
Wang D.,Chi Z.,Yue B.,et al. Effects of mowing and nitrogen addition on the ecosystem C and N pools in a temperate steppe: A case study from northern China[J]. Catena,2020-01-01,185