Responses of Grassland and Forest to Temperature
and Precipitation Changes in Northeast China |
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| Authors: | PENG Jing DONG Wenjie YUAN Wenping and ZHANG Yong |
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| Affiliation: | State Key Laboratory of Earth Surface Processes and Resource Ecology,
College of Global Change and Earth System Science, Beijing Normal University, Zhuhai 519087,
State Key Laboratory of Earth Surface Processes and Resource Ecology,
College of Global Ch;State Key Laboratory of Earth Surface Processes and Resource Ecology,
College of Global Change and Earth System Science, Beijing Normal University, Zhuhai 519087,
State Key Laboratory of Earth Surface Processes and Resource Ecology,
College of Global Ch;State Key Laboratory of Earth Surface Processes and Resource Ecology,
College of Global Change and Earth System Science, Beijing Normal University, Zhuhai 519087,
State Key Laboratory of Earth Surface Processes and Resource Ecology,
College of Global Ch;National Climate Center, China Meteorological Administration, Beijing 100081 |
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| Abstract: | Using the Normalized Difference Vegetation Index (NDVI) as an indicator of
vegetation growth, we explored the characteristics and differences in the
response to drought of five vegetation biomes in Northeast China, including
typical steppe, desert steppe, meadow steppe, deciduous coniferous forest
and deciduous broad-leaved forest during the period 1982--2009. The results
indicate that growing season precipitation may be the primary vegetation
growth-limiting factor in grasslands. More than 70% of the temporal
variations in NDVI can be explained by the amount of precipitation during
the growing season in typical and desert steppes. During the same period,
the mean temperature in the growing season could explain nearly 43% of
the variations in the mean growing season NDVI and is therefore a dominant
growth-limiting factor for forest ecosystems. Therefore, the NDVI trends
differ largely due to differences in the vegetation growth-limiting factors
of the different vegetation biomes. The NDVI responses to droughts vary in
magnitude and direction and depend on the drought-affected areas of the five
vegetation types. Specifically, the changes in NDVI are consistent with the
variations in precipitation for grassland ecosystems. A lack of
precipitation resulted in decreases in NDVI, thereby reducing vegetation
growth in these regions. Conversely, increasing precipitation decreased the
NDVI of forest ecosystems. The results also suggest that grasslands under
arid and semi-arid environments may be more sensitive to drought than
forests under humid environments. Among grassland ecosystems, desert steppe
was most sensitive to drought, followed by typical steppe; meadow steppe was
the least sensitive. |
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| Keywords: | drought grassland forest NDVI departures precipitation departures temperature departures Northeast China |
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