See more from this Session: Advances In GIS Application: Environmental Monitoring/Assessment and Resource Management
Wednesday, October 19, 2011: 1:35 PM
Henry Gonzalez Convention Center, Room 217A, Concourse Level
Atmospheric methane (CH4) is an important climate forcing agent. In absence of data on paddy water regimes and other emission-influencing factors, global budget of CH4 is still estimated with large scale uncertainties at regional and global scales. The objective of the study, therefore, was to estimate high resolution CH4 budget by integrating the emission factors related to various crop establishment and management practices using remote sensing and spatial modeling. Using multi-temporal LISS III composite NDVI data of kharif season 2006, we estimated 176552 ha area of paddy harvest in Karnal. The CH4 emission factors obtained from Gas chamber experiments conducted at farmer fields of Karnal, were 6.65 ± 0.79 , 7.65 ± 0.91 and 12.77 ± 1.52 g m-2 for MA, SA and CF water regimes, respectively. Acreage under water regimes, cultivar type, organic amendments and seedling age was calculated using the spatial modeling; and scaling factors were applied to arrive at total CH4 budget (12.69 ± 1.50 Gg y-1). The enhancement in CH4 emissions was from 26.18 ± 3.11 to 29.71 ± 3.53 Gg y-1 when factors like organic amendment, rice cultivar variety and rice seedling age were applied. The maximum (59%) emissions were observed in MA paddy water regime. Nissing, Assandh and Nilokheri accounted for 59% of total CH4 budget and were identified as “hot spot” blocks.