The additions of Nitrogen and Sulfur synergistically decrease the release of Carbon and Nitrogen from litter in a subtropical forest
Tie, Liehua (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Fu, Rao (Sichuan Agricultural University. Sichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River (China))
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Sardans i Galobart, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Zhang, Shibin (Sichuan Agricultural University. Sichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River (China))
Zhou, Shixing (Sichuan Agricultural University. Sichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River (China))
Huang, Congde (Sichuan Agricultural University. Sichuan Province Key Laboratory of Ecological Forestry Engineering on the Upper Reaches of the Yangtze River (China))

Data:	2020
Resum:	Atmospheric nitrogen (N) and sulfur (S) deposition in subtropical forests has increased rapidly and the current level is very high, thus seriously affecting nutrient (e. g. , N and phosphorus (P)) release from litter. However, the specific effects of S addition and its interaction with N on the release of carbon (C), N, and P from litter in subtropical evergreen broadleaved forests are unclear. Therefore, a two-year field experiment was performed using a litterbag method in a subtropical evergreen broadleaved forest in western China to examine the responses of litter decomposition and nutrient release to the control (CK), added N (+N), added S (+S), and added N and S (+NS) treatments. The results showed that the remaining litter mass, lignin, cellulose, C, N, P, and litter N/P ratio were higher, whereas the litter C/N ratio and soil pH were lower in the fertilization treatments than in CK. The annual decomposition coefficients (k-values) in the +N, +S, and +NS treatments were 0. 384 ± 0. 002, 0. 378 ± 0. 002, and 0. 374 ± 0. 001 year-1, respectively, which were significantly lower than the k-values in CK (0. 452 ± 0. 005 year-1, p < 0. 05). The remaining mass, lignin, cellulose, C, and litter N/P ratio were higher, whereas the soil pH was lower in the +NS treatment than in the +N and +S. The interactive effects of N addition and S addition on the remaining litter lignin, cellulose, C, N, and P; the litter C/N, C/P, and N/P ratios; and the soil pH were significant (p < 0. 05). In conclusion, the addition of N and S synergistically decreased the degradation of lignin and cellulose and the release of C and N and increased the litter N/P ratio, suggesting that external N and S inputs synergistically slowed the release of C and N from litter and exacerbated litter P limitation during decomposition in this forest.
Ajuts:	European Commission 610028
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:	Acid deposition ; Litter decomposition ; C, N and P cycles ; Subtropical forest ; Nutrient limitation
Publicat a:	Forests, Vol. 11, Issue 12 (December 2020) , art. 1280, ISSN 1999-4907

DOI: 10.3390/f11121280

16 p, 3.4 MB

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