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	Changes in vegetation photosynthetic activity trends across the Asia-Pacific region over the last three decades
	Chen B. Z. ; Xu G. ; Coops N. C. ; Ciais P. ; Innes J. L. ; Wang G. Y. ; Myneni R. B. ; Wang T. L. ; Krzyzanowski J. ; Li Q. L. ; Cao L. ; Liu Y.
	2014
关键词	Climate change Vegetation growth dynamics NDVI Time series analysis Gradual changes Trend breaks Breakpoint Turning point Asia-Pacific region net primary production ndvi time-series north-america interannual variability ecological thresholds climate variability index patterns classifications oscillation
英文摘要	The updated Global Inventory Modeling and Mapping Studies (GIMMS) third generation global satellite Advanced Very High Resolution Radiometer (AVHRR) Normalized Difference Vegetation Index (NDVI) dataset provides very detailed global information on the state of vegetation from 1982 to 2011. Using these data we investigated the changes in the vegetation photosynthetic activity in the Asia-Pacific (AP) (including Australia, South East Asia, China, and the Pacific Coast of North America) region, by discerning gradual changes into two key metrics: 1) the cumulative annual NDVI in each year and 2) the seasonality or variance in that index. We then assessed changes using break and turning points using three statistical models (least-square linear, expanded paired-consecutive linear and piecewise regression models). We found that the AP region overall experienced increasing NDVI from 1982 through 2011 with an average rate of 530 x 10(-4) NDVI yr(-1) (0.13% yr(-1)). The annual NDVI increased from 1982 at a faster rate of 26.14 x 10(-4) NDVI yr-1 (0.65% yr(-1)) until a break in the trend after 1991 (after that the trend reduced to 5.78 x 10(-4) NDVI yr(-1)). In the Asia-Australia (AA) subarea of the AP, vegetation greening slowly increased at 8.71 x 10(-4) NDVI yr(-1) before 2003 and then increased to 28.30 x 10(-4) NDVI yr(-1) after 2003. In contrast, in the North America (NA) subarea NDVI rapidly increased initially at 18.72 x 10(-4) NDVI yr(-1) before 1992 and then marginally increased (3.96 x 10(-4) NDVI yr(-1)) after 1992. The turning points were found to be 2008 and 1987 for the AA and NA subareas respectively. Analysis of monthly NDVI data showed that the trends were positive for most of the months of the study period, particularly during the growing season. Geospatial analyses demonstrated that cumulative annual NDVI and the variance or seasonality across the large AP region varied across the different subareas. As well, we found evidence for different spatial patterns of the NDVI changes with strong spatial heterogeneity in the patterns of the break and turning points. This suggests complex and nonlinear responses of vegetation photosynthetic activity to regional climatic changes and other drivers. (C) 2014 Elsevier Inc. All rights reserved.
出处	Remote Sensing of Environment
卷	144
页	28-41
收录类别	SCI
语种	英语
ISSN号	0034-4257
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29954]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Chen B. Z.,Xu G.,Coops N. C.,et al. Changes in vegetation photosynthetic activity trends across the Asia-Pacific region over the last three decades. 2014.

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