The spatial-temporal distribution of leaf area index in China a comparison between ecosystem modeling and remote sensing reversion

Transcription

1 Acta Ecologica Sinica 1 * AVIM AVIM2 The spatial-temporal distribution of leaf area index in China a comparison between ecosystem modeling and remote sensing reversion HUANG Mei 1 * JI Jinjun Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research CAS Beijing China 2 Institute of Atmospheric Physics CAS Beijing China Abstract Leaf area index LAI is an important parameter to characterize the canopy characteristics. It has significant influence on ecosystem carbon cycle researches since its critical factor to determine ecosystem net primary productivity. The large scale leaf area index can be obtained by both remote sensing reversion and ecosystem modeling though uncertainties exist in the two methods. The atmosphere-vegetation interaction model AVIM2 was used in this study to generate Chinawide leaf area index at the resolution of 0. 1 grid degree. The spatial distribution and seasonal cycles of model-generated LAI were compared with two datasets. One is satellite-derived LAI which was deduced by Myneni 1997 based on the physical principles of radiative transfer in vegetation and atmosphere. The other was deduced by Hagemann 2002 based on Advanced Very High Resoulution Radiometer AVHRR dataset by using heuristic corrective method. Hagemann s dataset has being wildly used in general circulation models GCMs. The comparison shows that the spatial distribution of China s vegetation LAI is mainly restricted by water conditions which appears an overall trend of high in southeast and low in northwest. The seasonal cycle of China s LAI is closely correlated with the monsoon s movement in a year. It is identical with seasonal variation trends of temperature and surface solar radiation. The seasonal cycle of LAI in China-wide appears a trend of high in summer moderate in spring and autumn and low in winter. Key Words leaf area index AVIM2 remote sensing revision transect China BAC03A11-01 KZCX2-YW U0607SZ * Corresponding author. huangm@ igsnrr. ac. cn

2 LAI Myneni 11 Hagemann Myneni NDVI Myneni Hagemann Knorr 14 AVHRR Hagemann Hagemann High Resolution Limited Area Model HIRLAM ECHAM AVIM ANUSPLIN MODIS 1km AVIM Ji 17 AVIM CO CENTURY 20 CEVSA LAI dm i dt = η i A - R - Loss i i = f s r 1

3 A R η i Loss i f s r AVIM2 M f LAI = M f ρ F 2 ρ f AVIM2 CO 2 η f η s η r { η r = 1 - α η f η f = 1 - α 1 exp - b1 LAI /LAIM 2 LAIM b1 α 1 α η x = α η f AVIM2 Myneni Hagemann AVIM2 4 6 Myneni 5 6 Hagemann 3 5 AVIM2 Hagemann 3 5 Myneni 2 4 AVIM2 1 3 Hagemann AVIM2 1 Hagemann 1 Myneni AVIM2 1 3 Hagemann 2 3 Myneni 2 6 AVIM2 AVIM2

4 Fig. 1 1 Comparison of the spatial pattern of maximum leaf area index Myneni Hagemann AVIM N m mm 2a E E 105 E AVIM E 2b Hagemann Mynemi N E N E N E

5 Fig. 2 Comparison of the variations of mean temperature precipitation elevation and maximum leaf area index predicted by AVIM2 Myneni and Hagemann along southern east-west transect N N 3a 3a b 10 3b Fig. 3 3 Seasonal cycle of leaf area index for major ecosystem a N E b N E c N E

6 AVIM2 Myneni 2 3c 3c AVIM2 Hagemann AVIM2 AVIM2 4 AVIM2 20a LAI 1 LAI 5 8 LAI 4 LAI 0 11 Fig. 4 4 AVIM2 AVIM2 predicted leaf area index pattern for winter spring summerand autumn

7 Statistical Program for Social Sciences SPSS Table Correlation coefficients between leaf area index and June to August soil moisture annual precipitation and annual mean temperature Data Sources Samples Soil moisture Precipitation Temperature Myneni Hagemann AVIM Hagemann Luo 23 Ni 24 References 1 Jonckheere I Fleck S Nackaerts K Muysa B Coppin P Weiss M Baret F. Review of methods for in situ leaf area index determination Part 1. Theories sensors and hemispherical photography. Agricultural and Forest Meteorology Chen J M Black T A. Define leaf area index for non-flat leaves. Plant Cell Environ Sellers P J Hall F G Kelly R D Black A Baldocchi D Berry J Ryan M Ranson K J Crill P M Lettenmaier D P Margolis H Cihlar J Newcomer J Fitzjarrald D Jarvis P G Gower S T Halliwell D Williams D Goodison B Wickland D E Guertin F E. Experiment overview scientific results and future directions. Journal of Geophysics Research BOREAS in 1997

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