DOI: 10.1016/j.foreco.2015.03.017
Scopus记录号: 2-s2.0-84925821763
论文题名: Nitrogen fixation rates associated with the feather mosses Pleurozium schreberi and Hylocomium splendens during forest stand development following clear-cutting
作者: Stuiver B.M. ; Gundale M.J. ; Wardle D.A. ; Nilsson M.-C.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2015
卷: 347 起始页码: 130
结束页码: 139
语种: 英语
英文关键词: Acetylene reduction assay
; Boreal forest
; Bryophytes
; Forest nitrogen balance
; N modeling
; Understory vegetation
Scopus关键词: Biomass
; Correlation methods
; Forestry
; Light transmission
; Nitrogen
; Acetylene reduction assays
; Boreal forests
; Bryophytes
; Nitrogen balance
; Understory vegetation
; Nitrogen fixation
; biomass
; boreal forest
; chronosequence
; clearcutting
; correlation
; cyanobacterium
; moss
; nitrogen fixation
; stand structure
; thinning
; understory
; Forests
; Nitrogen
; Bryophyta
; bryophytes
; Cyanobacteria
; Empetrum hermaphroditum
; Hylocomium splendens
; Pinus sylvestris
; Pleurozium schreberi
英文摘要: Pleurocarpous feather mosses host di-nitrogen (N2 ) fixing cyanobacteria, and this association serves as an important source of N input to late-successional natural boreal forests. However, little is known about how forest management affects feather mosses and their associated N2 -fixation rates, or how these rates change during post-logging stand development. We established a chronosequence of 32 forest stands used for commercial wood production to better understand how stand development after clear-cutting drives changes in biomass and N2 -fixation rates of the two dominant feather mosses, Pleurozium schreberi and Hylocomium splendens. These stands included eight replicate stands of each of four stand types: (1) recently clear-cut and newly planted stands (CC, 4years); (2) pre-commercial thinning stands (PCT, 16years); (3) first thinning stands (T1, 34years); and (4) mature uncut forest (MF, 123years), all dominated by Pinus sylvestris. We found that clear-cutting did not reduce moss biomass relative to the uncut forest. Further, biomass of P. schreberi (but not of H. splendens) increased twofold from CC stands to PCT stands, and remained high throughout the T1 stands. Di-nitrogen fixation capacity, determined as the amount of N fixed per unit moss mass, was ca. six and three times larger in PCT stands compared to the other stand types for P. schreberi and H. splendens respectively. Correlation analyses showed that N2 -fixation capacity associated with both moss species increased with increasing Empetrum hermaphroditum biomass, and that N2 -fixation capacity of P. schreberi declined with increasing NH4 + availability. Further, correlation analysis showed that N2 -fixation capacity of H. splendens declined with increasing tree biomass and decreasing light transmission. The total amount of N fixed at the stand level was highest in the PCT stands (1.0kgha-1year-1 of N), and was associated with both high moss biomass and high N2 -fixation capacity. The contribution of N2 -fixation to total N accrual per hectare during stand development was ca. 9%, and across the chronosequence N2 was fixed on average at rates of 0.4kgha-1year-1. Our results show that N2 -fixation rates in feather moss communities were promoted by the conditions at the PCT stands approximately 16years after clear-cutting, while N2 -fixation rates were lowest under conditions at the newly clear-cut and mature stands. Further, it suggests that mosses and associated N2 -fixation can be important in maintaining a long-term N balance, and that this source of N input should be accounted for when modeling N balance in N-limited managed boreal forests. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/65453
Appears in Collections: 影响、适应和脆弱性
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作者单位: Swedish University of Agricultural Sciences, Department of Forest Ecology and Management, Umeå, Sweden
Recommended Citation:
Stuiver B.M.,Gundale M.J.,Wardle D.A.,et al. Nitrogen fixation rates associated with the feather mosses Pleurozium schreberi and Hylocomium splendens during forest stand development following clear-cutting[J]. Forest Ecology and Management,2015-01-01,347