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DOI10.1111/gcb.13464
Mapping gains and losses in woody vegetation across global tropical drylands
Tian, Feng1; Brandt, Martin1; Liu, Yi Y.2,3; Rasmussen, Kjeld1; Fensholt, Rasmus1
2017-04-01
发表期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2017
卷号23期号:4
文章类型Article
语种英语
国家Denmark; Australia
英文摘要

Woody vegetation in global tropical drylands is of significant importance for both the interannual variability of the carbon cycle and local livelihoods. Satellite observations over the past decades provide a unique way to assess the vegetation long-term dynamics across biomes worldwide. Yet, the actual changes in the woody vegetation are always hidden by interannual fluctuations of the leaf density, because the most widely used remote sensing data are primarily related to the photosynthetically active vegetation components. Here, we quantify the temporal trends of the nonphotosynthetic woody components (i.e., stems and branches) in global tropical drylands during 2000-2012 using the vegetation optical depth (VOD), retrieved from passive microwave observations. This is achieved by a novel method focusing on the dry season period to minimize the influence of herbaceous vegetation and using MODerate resolution Imaging Spectroradiometer (MODIS) Normalized Difference Vegetation Index (NDVI) data to remove the interannual fluctuations of the woody leaf component. We revealed significant trends (P < 0.05) in the woody component (VODwood)in 35% of the areas characterized by a nonsignificant trend in the leaf component (VODleaf modeled from NDVI), indicating pronounced gradual growth/ decline in woody vegetation not captured by traditional assessments. The method is validated using a unique record of ground measurements from the semiarid Sahel and shows a strong agreement between changes in VODwood and changes in ground observed woody cover (r(2) = 0.78). Reliability of the obtained woody component trends is also supported by a review of relevant literatures for eight hot spot regions of change. The proposed approach is expected to contribute to an improved assessment of, for example, changes in dryland carbon pools.


英文关键词deforestation drylands nonphotosynthetic woody component remote sensing shrub encroachment trend analysis wood biomass woody vegetation
领域气候变化 ; 资源环境
收录类别SCI-E
WOS记录号WOS:000396836800031
WOS关键词SOIL-MOISTURE ; DEFORESTATION RATES ; SEMIARID ECOSYSTEMS ; OPTICAL DEPTH ; SATELLITE ; FOREST ; TRENDS ; COVER ; CO2 ; DEGRADATION
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; Environmental Sciences & Ecology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/17392
专题气候变化
资源环境科学
作者单位1.Univ Copenhagen, Dept Geosci & Nat Resource Management, DK-1350 Copenhagen, Denmark;
2.Univ New South Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW 2052, Australia;
3.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW 2052, Australia
推荐引用方式
GB/T 7714
Tian, Feng,Brandt, Martin,Liu, Yi Y.,et al. Mapping gains and losses in woody vegetation across global tropical drylands[J]. GLOBAL CHANGE BIOLOGY,2017,23(4).
APA Tian, Feng,Brandt, Martin,Liu, Yi Y.,Rasmussen, Kjeld,&Fensholt, Rasmus.(2017).Mapping gains and losses in woody vegetation across global tropical drylands.GLOBAL CHANGE BIOLOGY,23(4).
MLA Tian, Feng,et al."Mapping gains and losses in woody vegetation across global tropical drylands".GLOBAL CHANGE BIOLOGY 23.4(2017).
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