Local spatial structure of forest biomass and its consequences for remote sensing of carbon stocks
文献类型：期刊论文
| 作者 | Cao, M
|
| 刊名 | BIOGEOSCIENCES
 |
| 出版日期 | 2014 |
| 卷号 | 11期号:23页码:6827-6840 |
| 关键词 | ALOS PALSAR DATA ABOVEGROUND BIOMASS ERROR PROPAGATION AMAZONIAN FOREST TROPICAL FORESTS AIRBORNE LIDAR LIVE BIOMASS MODELS DEFORESTATION REGRESSION |
| ISSN号 | 1726-4170 |
| 中文摘要 | Advances in forest carbon mapping have the potential to greatly reduce uncertainties in the global carbon budget and to facilitate effective emissions mitigation strategies such as REDD+ (Reducing Emissions from Deforestation and Forest Degradation). Though broad-scale mapping is based primarily on remote sensing data, the accuracy of resulting forest carbon stock estimates depends critically on the quality of field measurements and calibration procedures. The mismatch in spatial scales between field inventory plots and larger pixels of current and planned remote sensing products for forest biomass mapping is of particular concern, as it has the potential to introduce errors, especially if forest biomass shows strong local spatial variation. Here, we used 30 large (8-50 ha) globally distributed permanent forest plots to quantify the spatial variability in aboveground biomass density (AGBD in Mgha(-1)) at spatial scales ranging from 5 to 250m (0.025-6.25 ha), and to evaluate the implications of this variability for calibrating remote sensing products using simulated remote sensing footprints. We found that local spatial variability in AGBD is large for standard plot sizes, averaging 46.3% for replicate 0.1 ha subplots within a single large plot, and 16.6% for 1 ha subplots. AGBD showed weak spatial autocorrelation at distances of 20-400 m, with autocorrelation higher in sites with higher topographic variability and statistically significant in half of the sites. We further show that when field calibration plots are smaller than the remote sensing pixels, the high local spatial variability in AGBD leads to a substantial "dilution" bias in calibration parameters, a bias that cannot be removed with standard statistical methods. Our results suggest that topography should be explicitly accounted for in future sampling strategies and that much care must be taken in designing calibration schemes if remote sensing of forest carbon is to achieve its promise. |
| 原文出处 | 10.5194/bg-11-6827-2014 |
| 语种 | 英语 |
| 公开日期 | 2015-03-26 |
| 源URL | [http://ir.xtbg.org.cn/handle/353005/8393]  |
| 专题 | 西双版纳热带植物园_其他 西双版纳热带植物园_森林生态研究组 |
| 推荐引用方式 GB/T 7714 | Cao, M. Local spatial structure of forest biomass and its consequences for remote sensing of carbon stocks[J]. BIOGEOSCIENCES,2014,11(23):6827-6840. |
| APA | Cao, M.(2014).Local spatial structure of forest biomass and its consequences for remote sensing of carbon stocks.BIOGEOSCIENCES,11(23),6827-6840. |
| MLA | Cao, M."Local spatial structure of forest biomass and its consequences for remote sensing of carbon stocks".BIOGEOSCIENCES 11.23(2014):6827-6840. |
入库方式： OAI收割
来源：西双版纳热带植物园
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。