Dynamics of understorey biomass, production and turnover associated with long-term overstorey succession in boreal forest of Canada

被引:28
|
作者
Kumar, Praveen [1 ]
Chen, Han Y. H. [1 ,2 ]
Searle, Eric B. [1 ]
Shahi, Chander [1 ]
机构
[1] Lakehead Univ, Fac Nat Resources Management, 955 Oliver Rd, Thunder Bay, ON P7B 5E1, Canada
[2] Fujian Normal Univ, Sch Geog Sci, Minist Educ, Key Lab Humid Subtrop Ecogeog Proc, Fuzhou 350007, Fujian, Peoples R China
基金
加拿大自然科学与工程研究理事会;
关键词
Boreal forest; Biomass; Bryophytes; Herbaceous plants; Overstorey composition; Production; Time since disturbance; Turnover rate; Understorey; Woody plants; NET PRIMARY PRODUCTION; NITROGEN-FIXATION; HERBACEOUS-LAYER; SPECIES COMPOSITION; WESTERN HEMLOCK; SPRUCE FORESTS; MIXED CANOPIES; DIVERSITY; VEGETATION; PLANT;
D O I
10.1016/j.foreco.2018.05.066
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Understorey vegetation hosts the most species diversity in temperate and boreal forests and contributes substantially to ecosystem functions. Despite its ecological importance, the dynamics of understorey biomass, production and turnover rates following stand-replacing disturbance and throughout forest succession remain poorly understood. Using a replicated chronosequence spanning 8, 16, 34, 98, 146 and 210 years following fire, we examined the dynamics of understorey biomass, production and turnover associated with stand development and overstorey types (broadleaf, mixedwood, and conifer) in the central boreal forest of Canada. Across all ages and overstorey types, biomass, production and turnover rates of woody plants, herbs, and bryophytes were on average 2.71, 0.10, and 0.13 Mg ha(-1); 0.24, 0.13, and 0.08 Mg ha(-1) year(-1) and 9.7%, 127.3%, and 67.6% year(-1), respectively. Total understorey biomass and production increased continuously with stand age and reached the maximum in 146-year-old stands. Herbaceous biomass and production, peaked in 16-year-old stands, and remained stable thereafter with a slight increase in 146-year-old stands; in contrast, woody plant and bryophyte biomass and production peaked in 98- and 146-year-old stands. Herbaceous and woody vegetation turnover rates were higher in young stands, and those of bryophytes were higher in older stands. Total, woody and herbaceous biomass, production and turnover rates were higher under deciduous broadleaf overstorey, while values for bryophytes were higher in conifer stands, with mixedwood being intermediate. Overstorey mixture had no overall effect on total, woody, herbaceous biomass and production other than the expected from the averages of their broadleaf and conifer stands, but reduced bryophyte biomass and woody turnover. Our findings suggest that understorey biomass, production and turnover rates in the boreal forest are mainly driven by time since colonization and the resource availability and heterogeneity mediated via overstorey composition. Our results highlight the roles of stand development and overstorey composition in understorey biomass, production and turnover and their importance for modeling total forest ecosystem contribution to the global forest carbon.
引用
收藏
页码:152 / 161
页数:10
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