MODIS satellite based net primary productivity of natural rubber in traditional growing region of India

  • Shankar Meti and James Jacob


Net primary productivity (NPP), an indicator of ecosystem productivity is being assessed by field sampling technique or by gas exchange
technique but are not ideal for regional level assessment/monitoring with spatial and temporal dimension. In this regard, satellite based
NPP data are becoming the handier tool in monitoring and assessment of ecosystem performance spatially and temporally at regional
and global level in non-destructive and cost effective manner. This paper aims at understanding the variation in the productivity of
rubber ecosystem by MODIS satellite based NPP data across the traditional belt of India and their relation with topography, soil and
climatic factors of present as well as projected future climate. MODIS satellite based average annual NPP of rubber plantation was
estimated as 10 tons C ha-1 year. Rubber NPP showed geographical variation across the traditional rubber belt showing significant negative correlation with latitude (r = -0.54) and positive correlation with longitude (r = 0.327). Mean diurnal temperature range, T-1 of warmest month, annual temperature range and annual precipitation showed significant negative correlation with rubber NPP. Soil
management unit as well as moisture adequacy index showed significant effect on rubber NPP. Soil with high OC, less gravel and more
depth showed better NPP. Rubber NPP showed a significant positive relation with soil moisture. Regression based model predicted
declining trend of rubber NPP in southern region and increasing trend in central region under future climatic condition.The present
study indicated significant influence of climate, topography and soil on rubber ecosystem.


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