Nitrogen additions retard nutrient release from two contrasting foliar litters in a subtropical forest, southwest China
Zhuang, Liyan (Forschungszentrum Jülich GmbH. Agrosphere (IBG-3))
Liu, Qun (Helmholtz-Centre for Environmental Research-UFZ. Department of Community Ecology)
Liang, Ziyi (Sichuan Agricultural University. Long-term Research Station of Alpine Forest Ecosystems)
You, Chengming (Sichuan Agricultural University. Long-term Research Station of Alpine Forest Ecosystems)
Tan, Bo (Sichuan Agricultural University. Long-term Research Station of Alpine Forest Ecosystems)
Zhang, Li (Sichuan Agricultural University. Long-term Research Station of Alpine Forest Ecosystems)
Yin, Rui (Helmholtz-Centre for Environmental Research-UFZ. Department of Community Ecology)
Yang, Kaijun (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Bol, Roland (Forschungszentrum Jülich GmbH. Agrosphere (IBG-3))
Xu, Zhenfeng (Sichuan Agricultural University. Long-term Research Station of Alpine Forest Ecosystems)

Data:	2020
Resum:	Litter decomposition plays a critical role in regulating biogeochemical cycles in terrestrial ecosystems and is profoundly impacted by increasing atmospheric nitrogen (N) deposition. Here, a N manipulation experiment was conducted to explore the effects of N additions (0 kg N ha yr, 20 kg N ha yr and 40 kg N ha yr) on decay rates and nutrients release of two contrasting species, the evergreen and nutrient-poor Michelia wilsonii and the deciduous and nutrient-rich Camptotheca acuminata, using a litterbag approach at the western edge of the Sichuan Basin of China. The decay rate and the mineralization of N and phosphorus (P) was faster in nutrient-rich C. acuminata litter than in nutrient-poor M. wilsonii litter, regardless of N regimes. N additions tended to decrease the decay constant (k value) in M. wilsonii litter, but had no effect on C. acuminata litter. N additions had no significant effects on carbon (C) release of both litter types. N additions showed negative effects on N and P release of M. wilsonii litter, particularly in the late decomposition stage. Moreover, for C. acuminata litter, N additions did not affect N release, but retarded P release in the late stage. N additions did not affect the C:N ratio in both litter types. However, N additions-especially high-N addition treatments-tended to reduce C:P and N:P ratios in both species. The effect of N addition on N and P remaining was stronger in M. wilsonii litter than in C. acuminata litter. The results of this study indicate that N additions retarded the nutrients release of two foliar litters. Thus, rising N deposition might favor the retention of N and P via litter decomposition in this specific area experiencing significant N deposition.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Nitrogen deposition ; Litter decomposition ; Litter-residue quality ; Subtropical forest
Publicat a:	Forests, Vol. 11, issue 4 (April 2020) , art. 377, ISSN 1999-4907

DOI: 10.3390/F11040377

11 p, 1.3 MB

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