DOI: 10.1016/j.foreco.2017.03.037
Scopus记录号: 2-s2.0-85017165899
论文题名: Patterns of biomass allocation in Haloxylon persicum woodlands and their understory herbaceous layer along a groundwater depth gradient
作者: Xu G.-Q. ; Yu D.-D. ; Li Y.
刊名: Forest Ecology and Management
ISSN: 0378-1127
出版年: 2017
卷: 395 起始页码: 37
结束页码: 47
语种: 英语
英文关键词: Desert ecosystem
; Groundwater depth gradient
; Haloxylon persicum
; Root-to-shoot ratio
; Vertical root distribution
Scopus关键词: Biomass
; Carbon
; Forestry
; Groundwater
; Landforms
; Plants (botany)
; Soils
; Vegetation
; Desert ecosystem
; Ground water depths
; Haloxylon persicum
; Root to shoot ratio
; Vertical root distributions
; Groundwater resources
; Haloxylon persicum
英文摘要: To investigate above- and belowground biomass allocation patterns and the relationship of root distribution between different functional groups (shrubs vs. herbs) along a groundwater depth gradient, an experiment was carried out in a Haloxylon persicum woodland. Four sites were selected along the groundwater depth gradient. At each site, five sample plots (20 × 20 m) and 15 subplots (1 × 1 m) were established for a vegetation inventory of Haloxylon persicum and the herbaceous layer. The vegetation inventory included plant density, canopy coverage, height, and basal stem diameter of H. persicum. Allometric equations were established for H. persicum based on the biomass of 22 excavated trees, which were then applied to inventory data to provide stand estimates of aboveground biomass (AGB), belowground biomass (BGB), and total biomass (TB) of H. persicum. The AGB of the herbaceous layer was measured in subplots (1 × 1 m) and BGB was excavated and measured to a depth of 100 cm at 10-cm intervals. Our results indicated that the BGB-to-AGB ratio at the community level in the herbaceous layer increased notably along the gradient of declining groundwater depth. The depth of the soil horizon that contained 65% of the root surface area and 85% of the root biomass was shallower (0–2.5 m) in the deep end of the groundwater depth gradient than in the shallow end (0–3 m) of the gradient. H. persicum adjusted root distribution to capture water in the upper soil layers in response to the decline in groundwater depth. However, this adjustment was not sufficient to compensate for the decline in the water table: the BGB-to-AGB ratio showed no significant increase as AGB declined. On the contrary, herbaceous plants seemed better adapted to changes in the water table by effectively adjusting their BGB-to-AGB ratio. Use of BGB-to-AGB ratios that are specific to groundwater tables will significantly improve our estimates of BGB carbon stocks in these woodlands. Considering the scarcity of information on biomass stocks and partitioning in desert woodlands, our results might be applicable to other desert regions in Central Asia dominated by H. persicum. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/64344
Appears in Collections: 影响、适应和脆弱性
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作者单位: State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, China; State Key Lab of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, Xinjiang, China; State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18 Shuangqing Road, Haidian District, Beijing, China
Recommended Citation:
Xu G.-Q.,Yu D.-D.,Li Y.. Patterns of biomass allocation in Haloxylon persicum woodlands and their understory herbaceous layer along a groundwater depth gradient[J]. Forest Ecology and Management,2017-01-01,395