气候变化领域集成服务门户(CCPortal): Concentration and mineralization of organic carbon in forest soils along a climatic gradient

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DOI	10.1016/j.foreco.2018.09.026
	Concentration and mineralization of organic carbon in forest soils along a climatic gradient
	Zhao Z.; Wei X.; Wang X.; Ma T.; Huang L.; Gao H.; Fan J.; Li X.; Jia X.
发表日期	2019
ISSN	0378-1127
起始页码	246
结束页码	255
卷号	432
英文摘要	Forty-four percent of the organic carbon (OC) in the world's forests is stored in soils. However, the distribution and stability of OC in forest soils along a climatic gradient remain largely unclear, hindering our understanding and the accurate prediction of biogeochemical cycles in forest ecosystems in a changing world. To address these uncertainties, we measured OC and nitrogen (N) concentrations and mineralization of OC in soils from broadleaved and coniferous forests along a wide-ranging climatic gradient in China and related these to experimental N addition and climatic conditions. An 85-day incubation was conducted under 25 °C and 60% of soil moisture at field capacity to determine the mineralization of soil OC. We hypothesized that the concentrations of OC and N would be higher but the mineralization of OC would be lower in soils from colder and drier forests and that the mineralization would be positively responsive to N addition. In support of these hypotheses, the concentrations of OC and N decreased, while the mineralization of OC measured under standard laboratory condition increased, with mean annual precipitation (MAP) and temperature (MAT). These metrics were not affected by forest type or the interaction between forest type and site. Nitrogen addition increased the cumulative mineralized OC (Cm, g kg−1) by 6–67%, and the effects varied with site and soil depth, but were similar between the broadleaved and coniferous forests. The Cm decreased with increasing soil OC concentration, C/N ratio and mineral N, while the rate constant of OC mineralization (k, day−1) showed opposite relationships with these metrics. The addition of N did not change the slopes of the relationships of Cm and k with the C/N ratio, MAP, and MAT; however, it strengthened the negative relationship of Cm with OC and mineral N concentrations. The results from this study suggested that the mineralization of OC was limited by N availability in the studied forested soils, and the response of OC mineralization to N addition was independent of climatic conditions. © 2018 Elsevier B.V.
英文关键词	Broadleaved forest; Coniferous forest; Mean annual precipitation; Mean annual temperature; N addition; OC mineralization
语种	英语
scopus关键词	Biogeochemistry; Ecosystems; Forestry; Nitrogen; Organic carbon; Rate constants; Soil moisture; Broad-leaved forests; Coniferous forests; Mean annual precipitation; Mean annual temperatures; OC mineralization; Mineralogy; biogeochemical cycle; biomineralization; broad-leaved forest; climate change; climate conditions; concentration (composition); coniferous forest; forest ecosystem; forest soil; organic carbon; precipitation (chemistry); precipitation (climatology); soil depth; soil moisture; soil nitrogen; Carbon; Ecosystems; Forestry; Forests; Gradient; Nitrogen; Soil; Type; China
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/156389
作者单位	State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China; Department of Soil, Water and Climate, University of Minnesota, St Paul, 55108, United States; University of Chinese Academy of Sciences, Beijing, 100049, China
推荐引用方式 GB/T 7714	Zhao Z.,Wei X.,Wang X.,et al. Concentration and mineralization of organic carbon in forest soils along a climatic gradient[J],2019,432.
APA	Zhao Z..,Wei X..,Wang X..,Ma T..,Huang L..,...&Jia X..(2019).Concentration and mineralization of organic carbon in forest soils along a climatic gradient.Forest Ecology and Management,432.
MLA	Zhao Z.,et al."Concentration and mineralization of organic carbon in forest soils along a climatic gradient".Forest Ecology and Management 432(2019).