Vegetation distribution of China and its responses to climate change Ensheng Weng.

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Presentation transcript:

Vegetation distribution of China and its responses to climate change Ensheng Weng

Geographic features of China

Summer circulation Tibetan Plateau plays a critical role South-west monsoon South-east monsoon Westerly jet

Winter circulation Tibetan Plateau plays a critical role Westerly jet Tibetan cold high Siberia-Mongolian cold high

Climate of China

T (Jan.) T (Jul.)

Climate-Vegetation Relationships Climate determines vegetation distribution Precipitation and temperature are two key factors from Whittaker, 1975

Vegetation of China Wu, CY, Vegetation of China

Vegetation of China Wu, CY, Vegetation of China Tropical forest Sub-Tropical forest Temperate forest Mixed forest Taiga - +

Vegetation of China Wu, CY, Vegetation of China ForestMeadowsteppeTypicalsteppeDesertsteppeDesert +-

Vegetation of China Wu, CY, Vegetation of China Conifer forests Alpine meadows Alpine steppes Alpine deserts

Vegetation of China Wu, CY, Vegetation of China Conifer forests Alpine meadows Alpine steppes Alpine deserts ForestMeadowsteppeTypicalsteppeDesertsteppeDesert +- Tropical forest Sub-Tropical forest Temperate forest Mixed forest Taiga - +

How it response to climate change Changes of Temperature in past 50 years Northern area Central China Changes of Precipitation in past 50 years

Scenarios at the end of 21 st century CO 2 SRES-A2 CO 2 SRES-B2

BIOME model Defined 14 plant functional types (PFTs); Assigned a climatic envelope for every PFT; porsposed a rule to regulate the co-exist of PFTs; Biomes (vegetation types) are the combinations of PFTs.

BIOME model

Calibration Simulated map from original parameters the boundary between forests and steppes forests shift southwards

Calibration Priestley-Taylor coefficient

Calibration Temperature of January

Calibration The same PFTs occur in the colder and dryer areas

The results from new parameters Kappa=0.67

Response of vegetation distribution to climate change CO 2 SRES-A2CO 2 SRES-B2

Vulnerable areas Northern China Southwestern China Tibetan Plateau

Effects on Human being Desertification Deforestation

Thank you!