气候变化领域集成服务门户(CCPortal): 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

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DOI	10.1016/j.agrformet.2018.06.029
	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, Tao; Qu, Tiantian; Sun, Zhenzhong; Dybzinski, Ray; Chen, Anping; Yao, Xingcheng; Zeng, Hui; Piao, Shilong
通讯作者	Piao, SL (通讯作者)
发表日期	2018
ISSN	0168-1923
EISSN	1873-2240
起始页码	24
结束页码	33
卷号	262
英文摘要	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.
关键词	MICROBIAL BIOMASS HETEROTROPHIC COMPONENTS RHIZOSPHERE RESPIRATION ROOT RESPIRATION CARBON STORAGE CO2 FLUX FOREST TEMPERATURE DEPOSITION FERTILIZATION
英文关键词	Stand age; Heterotrophic respiration; Autotrophic respiration; Carbon cycle; Temperature sensitivity; N fertilization
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000444659300003
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259310
推荐引用方式 GB/T 7714	Yan, Tao,Qu, Tiantian,Sun, Zhenzhong,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]. 中国科学院青藏高原研究所,2018,262.
APA	Yan, Tao.,Qu, Tiantian.,Sun, Zhenzhong.,Dybzinski, Ray.,Chen, Anping.,...&Piao, Shilong.(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.
MLA	Yan, Tao,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(2018).