Global Pattern of Rain Use Efficiency and Its Impact Factors Instructor: Hongyan Liu Qiuyi Wang.

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Presentation transcript:

Global Pattern of Rain Use Efficiency and Its Impact Factors Instructor: Hongyan Liu Qiuyi Wang

OUTLINE Backgrounds & Scientific issues Methods & Data sources Preliminary results Plans

BACK- GROUNDS Study region: USA & Australia Cross-biome WUE: ANPP/ET

BACKGROUNDS Study region: North & South America Cross-biome RUE : ANPP/Prec High MAP : soil nitrogen or other limiting resources Low MAP : precipitation Water limitations → greatest : a common RUEmax

BACKGROUNDS Mongolia Plateau (Bai et al, 2008) Sahelian (Prince et al, 1998) Tibetan Plateau (Yang et al, 2010) Central Great Plains of USA (Lauenroth et al, 2000) Different conclusions in different regions

SCIENTIFIC ISSUES Vegetation rain use efficiency: Represented the impact of water availability on ecosystem production Connected carbon cycle and water cycle in terrestrial ecosystems Helped to predict the response of vegetation to climate In global scale: Is there an uniform significant trend of RUE along precipitation gradient? Different biomes have different RUE? Whether climate type affect RUE within a biome?

METHODS & DATA SOURCES How to calculate RUE? × Slope of linear regression of NPP and MAP √ Ratio of NPP and MAP (gC/m^2/yr/mm) Remove the abnormal values(0.5%) NPP data: MODIS17-NPP Products MAP data: CRU TS3.1 Time scale: Spatial resolution: 0.5°× 0.5°

GLOBAL PATTERN OF RAIN USE EFFICIENCY

Compared with measured results in Bai’s research 21 sites in Mongolia Plateau Possible cause of the differences : MODIS NPP includes root biomass TEST THE RESULTS calculated measured calculated measured

P/ET = 0.8 ~ 1.2 No significant difference between different ranges WATER BALANCE AREA a a a [ ] [ ][ ]

RUE-MAP Low MAP : high variation High MAP: low variation Correlation coefficient = （ p<0.01 ） Regression : Linear : R 2 = （ p<0.001 ） Log : R 2 =1.26E-05 （ p=0.71 ）

COMPARE RUE OF DIFFERENT BIOMES Classify our study region according to global biome map And model results of upper and lower limits of NPP Tundra: 0~423 Taiga: 124~434 Temperate Conifer: 208~704 Desert: 0~370 Temperate Grassland: 68~785 Broadleaf Forest: 81~1001 Tropical Grassland: 88~786 Tropical Forest: 323~1422

P/ET = 0.8 ~ 1.2 WATER BALANCE AREA

EXCLUDED THE POINTS BEYOND NPP RANGE

COMPARE RUE OF DIFFERENT BIOMES There are significant differences in RUE between biomes No significant differences between : Temperate Conifer & Broad leaf Forest Taiga & Temperate Grassland

COMPARE RUE OF DIFFERENT BIOMES Significant negative log trend : (except tundra and taiga) Within the same biome, areas with water limits may have higher RUE to remain NPP.

TaigaCold Dry Winter Cold Summer Cold Without Dry Season Cold Summer Cold Without Dry Season Very Cold Winter CDC CWC * CWV ** COMPARE RUE OF DIFFERENT CLIMATE TYPE TundraCold Without Dry Season Cold Summer Cold Without Dry Season Very Cold Winter Polar Tundra CWC CWV * PT ** * Significantly different from each other The number is the mean RUE of the climate type

COMPARE RUE OF DIFFERENT CLIMATE TYPE Temperate Conifer Cold Dry Winter Warm Summer Cold Dry Winter Cold Summer Cold Without Dry Season Warm Summer CDW CDC CWW DesertArid Desert Hot Arid Desert Cold Arid Steppe Hot Arid Steppe Cold ADH ADC * ASH * ASC *0.6143

COMPARE RUE OF DIFFERENT CLIMATE TYPE Temperate Grassland Arid Steppe Cold Dry Winter Warm Summer Cold Dry Winter Cold Summer Cold Without Dry Season Hot Summer Cold Without Dry Season Warm Summer ASC CDW CDC CWH CWW *** Broadl eaf Forest Arid Steppe Cold Temperate Without Dry Season Hot Summer Cold Dry Winter Warm Summer Cold Without Dry Season Warm Summer ASC TWH* CDW** CWW**0.8400

COMPARE RUE OF DIFFERENT CLIMATE TYPE Tropical Forest Tropical Rain Forest Tropical Monsoon Tropical Savannah Temperate Dry Winter Hot Summer TR TM TS ** TDH * Tropical Grassland Tropical Savannah Arid Desert Hot Arid Steppe Hot TS ADH * ASH **0.7646

CONCLUSIONS In global scale, no significant trend of RUE along precipitation gradient. There are significant differences in RUE between biomes For most biomes, there are significant differences in RUE between climate types

PLANS Understand different physiological processes between biomes Use climatic factors to explain the differences in RUE between climate types