气候变化领域集成服务门户(CCPortal): Modelling nitrogen mineralization and plant nitrogen uptake as affected by reclamation cover depth in reclaimed upland forestlands of Northern Alberta

CCPortal

DOI	10.1007/s10533-020-00676-5
	Modelling nitrogen mineralization and plant nitrogen uptake as affected by reclamation cover depth in reclaimed upland forestlands of Northern Alberta
	Welegedara N.P.Y.; Grant R.F.; Quideau S.A.; Das Gupta S.
发表日期	2020
ISSN	0168-2563
起始页码	293
结束页码	315
卷号	149 期号:3
英文摘要	Early forest re-establishment in landforms constructed from materials such as overburden or mine waste is partly determined by nitrogen (N) availability in reclamation covers. Here we examined whether the ecosystem model ecosys which simulates key processes governing N availability such as mineralization, plant N uptake and N return to soil through litterfall could be used to forecast potential N limitations for forest re-establishment in these constructed landforms. In this study, N cycling was simulated and tested against measured soil, foliar and surface litter N concentrations with three soil covers differing in thickness (35, 50, and 100 cm) in a 17-year-old forest reclamation site and in an analogue natural forested site in northern Alberta. Overall, results from this study demonstrated the applicability of the ecosys model in predicting nutrient cycling in reclaimed upland forestlands. Results of this study highlight the importance of optimum cover depth to ensure sufficient N is available for plant growth. Even though the modelled net N mineralization, N uptake and thereby plant productivity increased with cover depth, the foliar and surface litter N concentrations did not. A non-linear relationship between total soil nitrogen (TN) stocks and modelled net N mineralization indicated that cover depth, which determines TN stock, had little effect on net primary productivity beyond a threshold TN. This threshold was 17 Mg N ha−1, similar to TN for the 100 cm cover, giving a net N mineralization rate of ~ 3.5 g N m−2 year−1, and this was attributed to reduced microbial activity in deeper soil layers. © 2020, Springer Nature Switzerland AG.
英文关键词	Ecosys; Net primary productivity; Nitrogen availability; Reclamation cover depth
语种	英语
scopus关键词	biomineralization; forest soil; litterfall; microbial activity; mine waste; nitrogen; nitrogen cycle; nutrient uptake; reclaimed land; reforestation; soil nitrogen; woodland; Alberta; Canada
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153124
作者单位	Department of Renewable Resources, University of Alberta, 442 Earth Sciences Building, Edmonton, AB T6G 2E3, Canada
推荐引用方式 GB/T 7714	Welegedara N.P.Y.,Grant R.F.,Quideau S.A.,et al. Modelling nitrogen mineralization and plant nitrogen uptake as affected by reclamation cover depth in reclaimed upland forestlands of Northern Alberta[J],2020,149(3).
APA	Welegedara N.P.Y.,Grant R.F.,Quideau S.A.,&Das Gupta S..(2020).Modelling nitrogen mineralization and plant nitrogen uptake as affected by reclamation cover depth in reclaimed upland forestlands of Northern Alberta.Biogeochemistry,149(3).
MLA	Welegedara N.P.Y.,et al."Modelling nitrogen mineralization and plant nitrogen uptake as affected by reclamation cover depth in reclaimed upland forestlands of Northern Alberta".Biogeochemistry 149.3(2020).