Strong responses of soil greenhouse gas fluxes to litter manipulation in a boreal larch forest, Northeastern China
Duan, Beixing (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Xiao, Ruihan (Northeast Forestry University)
Cai, Tijiu (Northeast Forestry University)
Man, Xiuling (Northeast Forestry University)
Ge, Zhaoxin (Northeast Forestry University)
Gao, Mengdi (Northeast Forestry University)
Mencuccini, Maurizio (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Data:	2022
Resum:	Alterations in plant litter inputs into the soil are expected to significantly affect soil greenhouse gas (GHG) emissions. However, the influence on boreal forest soils is not clear, given the large amount of accumulated soil organic matter that may buffer the impacts from the input of fresh litter. In this study, we conducted a litter manipulation experiment to explore the effects of the litter layer on soil GHG fluxes in a Dahurian larch (Larix gmelinii) forest ecosystem in northeastern China. Three litter treatments were implemented, namely aboveground litter removal (LR), litter double (LD), and unchanged litter input (CK). The associated microclimate, litter characteristics, and soil properties were also measured. The results showed that this larch forest soil acts as a source of CO and NO but acts as a sink for CH for all litter manipulation treatments. LD increased the soil CO and NO fluxes by 15% and 34%, while LR decreased them by 8% and 21%, respectively. However, soil CH uptake decreased by 34% in LD treatment and increased by 22% in LR treatment, respectively. Litter manipulation treatments can not only affect soil GHG fluxes directly but also, via their effects on soil MBC, NH −N, and NO −N content, indirectly affect variations in soil CO, CH and NO fluxes, respectively. Our study highlights the importance of the plant litter layer in regulating soil GHG between the atmosphere and soil in a Dahurian larch forest ecosystem, especially for litter addition. Considering the natural increase in litter quantity over time, this important regulatory function is essential for an accurate estimation of the role of boreal forests in mitigating future climate change.
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:	Litter manipulation ; Greenhouse gas fluxes ; Larch forest ; Soil properties ; Boreal forest
Publicat a:	Forests, Vol. 13, Issue 12 (November 2022) , art. 1985, ISSN 1999-4907

DOI: 10.3390/f13121985

16 p, 2.8 MB

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