Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/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
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ISSN | 1354-1013 |
EISSN | 1365-2486 |
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). |
条目包含的文件 | 条目无相关文件。 |
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