Main Article Content
Abstract
This paper presents an attempt to investigate the changes on land cover that have occurred due to human activities and its impact on actual evapotranspiration, Ea , in Monsoon Asia. Comparison between current and potential vegetation classifications has been done to identify the impact of human activities on land cover distribution. The current vegetation was obtained from satellite data, while the potential vegetation was defined from climatic data. As a result of comparison of the both vegetation maps, we realized that India, and China were as the center of land cover changes. This also appears in tropics region, such as Indonesia and Malaysia. In general, the type of changes is from forest to non-forest such as, paddy field, cropland and grassland. These anthropogenic changes caused the decreased up to 180mm or 12% per year. The 0 value indicates such area where the has no changed, while the positive value indicates the of current condition has been decreased from potential one. The lower value (less than 5%) was happened when evergreen broadleaf forest (seasonal) changed to rice paddy such as in Shandong (China). It also occurred in Punjab and Uttar Pradesh (India) when the subtropical rain forest has been changed to cropland. In addition, when the sub tropical rain forest changed to rice paddy, such as in Assam (India) and Guangxi, and Guangdong (China), thewas decreased by 9%. The highest decreased value (12%) was occurred when the tropical rain forest was changed to rice paddy such as in Kalimantan Selatan (Indonesia) and Pahang (Malaysia).
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References
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References
Budyko, M.I. 1974. Climate and Life. Academic
Press, Inc, New York.
Leemans, R. 1990. Global Holdrige Life Zones.
Digital Data. IIASA, Austria.
Kira, T. 1945. New Climatic Zonation in Eastern Asia as a Basis of Agricultural Geography. Kyoto Imperial University (in Japanese).
Kondoh, A., A. B. Harto., E. Runtunuwu, and T Kojiri. 2004. Hydrological Regions in Monsoon Asia. Hydrological Process 18:3147-3158
Priestley, C. H. B., and R.J. Taylor. 1972. On the assessment of surface heat flux and evaporation using large-scale parameters. Monthly Weather Review 100: 81-92.
Running, S. W., R. Nemani, K. Hibbard, and G.
Churkina. 1996. The influence of land cover change on global terrestrial biogeochemistry. Proceedings of IGBP/BAHC-LUCC Joint Inter-Core Projects Symposium Kyoto, Japan; 6-9
Runtunuwu, E., A. Kondoh, A.B. Harto., and T.
Prayogo. 2000. Application of remote sensing and GIS for anthropogenic vegetation monitoring. Proceedings of SPIE, San Diego, USA, pp. 4135:395-402.
Runtunuwu, E. 2005. Human Activities and its
Impact on Land Cover Change. Buletin Hasil
Penelitian Agroklimat dan Hidrologi. 3(1) 9-
Runtunuwu, E and H. Syahbuddin. 2005. Global Analysis of The Relationship Between Precipitation and Vegetation Dynamics Derived From NOAA/AVHRR-NDVI. Jurnal Agromet. 19 (1) 1-11.
Runtunuwu, E. 2006. Determination of Crop Coefficient Using Ground Based Climatologically Data And Vegetation Index Derived From NOAA/AVHRR Data. Presented in the International Workshop on Client-Oriented Agroclimatological Services to Support Agriculture Development. Agricultural Meteorology Society, Jakarta, 9-
March 2006.
Thornthwaite, C. W., and Mather, J. R. 1957.
Instructions and tables for computing potential evapotranspiration and the water balance. Drexel Institute of Technology Laboratory of Climatology. Publication in Climatology, 4(3): 182-203.