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Negative effect of nitrogen addition on soil respiration dependent on stand age: Evidence from a 7-year field study of larch plantations in northern China
Yan, T (Yan, Tao)1; Qu, TT (Qu, Tiantian)2; Sun, ZZ (Sun, Zhenzhong)1; Dybzinski, R (Dybzinski, Ray)3; Chen, AP (Chen, Anping)4; Yao, XC (Yao, Xingcheng)2; Zeng, H (Zeng, Hui)2; Piao, SL (Piao, Shilong)1,5,6
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
2018-11-15
Volume262Issue:0Pages:24-33
DOI10.1016/j.agrformet.2018.06.029
Abstract

Increasing anthropogenic nitrogen (N) deposition will affect the global carbon (C) cycle, although the mechanisms and magnitudes of its effects are not yet fully understood. Soil respiration (Rs) and its components (i.e., heterotrophic (Rh) and autotrophic (Ra) respiration) represent the largest flux of carbon dioxide (CO2) from terrestrial ecosystems to the atmosphere. However, the potentially interactive effect of N addition and stand age on Rs in forests remains unclear. We conducted a 7-year (2010-2016) field experiment in three differently-aged larch plantations (11-, 20-, and 45-year-old, representing sapling, intermediate, and mature stands) to investigate the effects of different N addition rates (control: no N addition; low-N addition, N20: 20 kg N ha(-1) year(-1); and high-N addition, N50: 50 kg N ha(-1) year(-1)) on Rs. We found significant seasonal variation in Rs, Rh, and Ra, with levels highest in summer and lowest in autumn. Rs correlated strongly with soil temperature and weakly with soil moisture, and Its, Rh, and Ra increased exponentially with soil temperature. The temperature sensitivity (Q(10)) of Rs was lowest in the mature stand, which suggests that it will sequester relatively more C in a warmer climate. The Q u o of Rs was higher than that of Rh, indicating that it contributed proportionally more to the total soil CO2 efflux. N addition had no significant effect on Q(10). Rs in the intermediate stand was significantly lower than Rs in the sapling and mature stands, which may be due to its lower soil temperature and poorer substrate quality. N addition decreased Rs by an average of 9%, but significant effects were only observed in the sapling and intermediate stands. The negative influence of N addition on Rs was largely dependent on soil temperature, with more negative effects observed in the summer when temperatures were higher, and attributable to a reduction in either Ra in the intermediate stand or Rh in the sapling stand. We hypothesize that N limitation in the young trees was alleviated by fertilization, which decreased C allocation to roots, whereas N addition may have exerted a more negative influence on soil microbial activity in the sapling stand. In summary, our results highlight the importance of stand age in regulating the negative effects of N addition on Rs and its components, which has implications for projecting the global C-climate feedback in the future.

Subject Area生态学
WOS IDWOS:000444659300003
Language英语
Indexed BySCIE
KeywordMicrobial Biomass Heterotrophic Components Rhizosphere Respiration Root Respiration Carbon Storage Co2 Flux Forest Temperature Deposition Fertilization
WOS Research AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS SubjectAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
Cooperation Status国际
ISSN0168-1923
Department高寒生态重点实验室
PublisherELSEVIER SCIENCE BV
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/8503
Collection图书馆
Corresponding AuthorPiao, SL (Piao, Shilong)
Affiliation1.Peking Univ, Coll Urban & Environm Sci, Sinofrench Inst Earth Syst Sci, Beijing 100871, Peoples R China;
2.Peking Univ, Sch Urban Planning & Design, Shenzhen 518055, Peoples R China;
3.Loyola Univ Chicago, Inst Environm Sustainabil, Chicago, IL 60660 USA;
4.Purdue Univ, Dept Forestry & Nat Resources, W Lafayette, IN 46907 USA;
5.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol & Biodivers, Beijing 100085, Peoples R China;
6.Chinese Acad Sci, Ctr Excellence Tibetan Earth Sci, Beijing 100085, Peoples R China.
Recommended Citation
GB/T 7714
Yan, T ,Qu, TT ,Sun, ZZ ,et al. Negative effect of nitrogen addition on soil respiration dependent on stand age: Evidence from a 7-year field study of larch plantations in northern China[J]. AGRICULTURAL AND FOREST METEOROLOGY,2018,262(0):24-33.
APA Yan, T .,Qu, TT .,Sun, ZZ .,Dybzinski, R .,Chen, AP .,...&Piao, SL .(2018).Negative effect of nitrogen addition on soil respiration dependent on stand age: Evidence from a 7-year field study of larch plantations in northern China.AGRICULTURAL AND FOREST METEOROLOGY,262(0),24-33.
MLA Yan, T ,et al."Negative effect of nitrogen addition on soil respiration dependent on stand age: Evidence from a 7-year field study of larch plantations in northern China".AGRICULTURAL AND FOREST METEOROLOGY 262.0(2018):24-33.
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