Abstract
The pattern of vegetation change in response to global change still remains a controversial issue. A Normalized Difference Vegetation Index (NDVI) dataset compiled by the Global Inventory Modeling and Mapping Studies (GIMMS) was used for analysis. For the period 1982–2006, GIMMS-NDVI analysis indicated that monthly NDVI changes show homogenous trends in middle and high latitude areas in the northern hemisphere and within, or near, the Tropic of Cancer and Capricorn; with obvious spatio-temporal heterogeneity on a global scale over the past two decades. The former areas featured increasing vegetation activity during growth seasons, and the latter areas experienced an even greater amplitude in places where precipitation is adequate. The discussion suggests that one should be cautious of using the NDVI time-series to analyze local vegetation dynamics because of its coarse resolution and uncertainties.
Highlights
Vegetation is the dominant component of terrestrial ecosystems, which play a vital role in the cycle of global resources and energy [1]
Vegetation activities at mid-high latitude in the northern hemisphere increased dramatically during the past decades [12,13]. This phenomenon is attributed to two factors: (1) carbon dioxide accumulation in the atmosphere causing a rise in temperature; and (2) sequestration of soil nitrogen and phosphorus leading to vegetation vigor varied with greater periodic oscillation [14]
The response of vegetation in some regions to global change is mainly reflected by longer growing periods, while in other regions, ecosystems respond with greater amplitude in vegetation vigor, or include both features mentioned above
Summary
Vegetation is the dominant component of terrestrial ecosystems, which play a vital role in the cycle of global resources and energy [1] It has an irreplaceable function in regulating global. Vegetation activities at mid-high latitude in the northern hemisphere increased dramatically during the past decades [12,13]. This phenomenon is attributed to two factors: (1) carbon dioxide accumulation in the atmosphere causing a rise in temperature; and (2) sequestration of soil nitrogen and phosphorus leading to vegetation vigor varied with greater periodic oscillation [14]. Investigating the spatial-temporal pattern of vegetation change over the world in recent decades is necessary for obtaining a greater understanding of global change and the corresponding vegetation response
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