DOI: 10.1016/j.foreco.2019.117793
论文题名: The effects of warming and nitrogen addition on fine root exudation rates in a young Chinese-fir stand
作者: Xiong D. ; Huang J. ; Yang Z. ; Cai Y. ; Lin T.-C. ; Liu X. ; Xu C. ; Chen S. ; Chen G. ; Xie J. ; Li Y. ; Yang Y.
刊名: Forest Ecology and Management
ISSN: 3781127
出版年: 2020
卷: 458 语种: 英语
英文关键词: Cunninghamia lanceolata
; Elevated temperature
; Fine root exudates
; Interactive effect
; Nitrogen deposition
; Subtropical plantation
Scopus关键词: Ecosystems
; Nitrogen
; Nutrients
; Tropics
; Cunninghamia lanceolata
; Elevated temperature
; Fine roots
; Interactive effect
; Nitrogen deposition
; Subtropical plantation
; Soils
; carbohydrate
; coniferous tree
; exudation
; fine root
; forest ecosystem
; global warming
; nitrogen compound
; nutrient availability
; nutrient cycling
; plantation forestry
; sapling
; soil fertility
; subtropical region
; Abies
; Chinese
; Ecosystems
; Exudates
; Nitrogen
; Nutrients
; Soil
; Tropics
; Cunninghamia lanceolata
英文摘要: Despite the perceived importance of root exudates in forest ecosystem function, few studies have simultaneously examined the effects of elevated temperature and nutrient availability on root exudates, especially in the tropical and subtropical regions. This limits our ability to predict belowground C allocation and nutrient cycling in response to global change at a global scale. In this study, we used a complete randomized block design with factorial soil warming (ambient, ambient + 4 ℃) and nitrogen (N) addition (ambient, ambient + 40 Kg N ha−1 yr−1) to examine their effects on in situ fine root exudates and sapling growth in a young Chinese fir (Cunninghamia lanceolata) stand. We found that soil warming and N addition each had negative effects on root exudation rates. Moreover, there was a negative interactive effect of soil warming and N addition on fine root exudation rates (i.e., further reduction), likely due to altered fine root morphological and chemical properties, soil characteristics and belowground C allocation. Root exudation rates negatively related to soil inorganic N concentrations, but positively related to fine root diameter, specific root length, N concentration and non-structural carbohydrate concentration. Reducing root exudation rates may be a physiological adjustment of the Chinese fir stand to high soil nutrient availability associated with warming and N addition. Collectively, the results indicate that the effects of warming on root exudation rates are dependent on soil fertility and moisture. Reduced exudation rates under warming plus N addition may decrease the flux of labile C from the roots to the soil suggesting that N deposition may mitigate warming-enhanced SOM decomposition. These findings provide new insights into belowground C dynamics and root-soil interactions in response to soil warming and N addition. © 2019 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159276
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory for Subtropical Mountain Ecology (Ministry of Science and Technology and Fujian Province Funded), Fujian Normal University, Fuzhou, 350007, China; College of Geographical Sciences, Fujian Normal University, Fuzhou, 350007, China; Department of Life Science, National Taiwan Normal University, Taipei, 11677, Taiwan; College of Agriculture, Forestry and Natural Resource Management, University of Hawaii, Hilo, HI 96720, United States
Recommended Citation:
Xiong D.,Huang J.,Yang Z.,et al. The effects of warming and nitrogen addition on fine root exudation rates in a young Chinese-fir stand[J]. Forest Ecology and Management,2020-01-01,458