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Chavan S.B.,Central Agroforestry Research Institute | Rao G.R.,Indian Central Research Institute for Dryland Agriculture | Keerthika A.,Indian Central Arid Zone Research Institute
Indian Journal of Ecology

Studies on measuring CO2, CH4, and N2O fluxes from five agroforestry systems viz., teak, jatropha, pongamia, simaruba and leucaena were conducted at CRIDA, Hyderabad during June-August, 2013 in semi-arid alfisols. The fluxes were measured at weekly interval using closed static chamber technique and gas chromatography method. The highest mean soil CO2 emission observed in jatropha (5644.11 kg ha-1yr-1). teak (4422.90 kg ha-1yr-1) and simamba (4673.58 kg ha-1yr-1), whereas, lower values were recorded in pongamia (4575.28 kg ha-1yr-1) followed by leucaena (2556.94 kg ha-1yr-1). Observations regarding mean uptake in methane showed that in jatropha (8.57 kg ha-1yr-1) and Simaruba (7.37 kg ha-1yr-1) recorded higher values than pongamia (4.02 kg ha-1yr-1) and Teak (3.40 kg ha-1yr-1). The leucaena system (3.50 kg ha-1yr-1) was net emitter of methane as compared with other systems. Highest N2O fluxes during measurement period were observed in simaruba (140.62 kg ha-1yr-1), leucaena (123.96 kg ha-1yr-1) and pongamia (76.26 kg ha-1yr-1). In present study, temperature was most limiting factors than soil moisture among ail the agroforestry systems and produced better fit polynomial models with fluxes of gases. This study gives an idea of successive potential values of GHGs in agroforestry systems to compare with carbon sequestration abilities of these systems. Source

Rizvi R.H.,Central Agroforestry Research Institute | Newaj R.,Central Agroforestry Research Institute | Karmakar P.S.,Central Agroforestry Research Institute | Saxena A.,Central Agroforestry Research Institute | Dhyani S.K.,Central Agroforestry Research Institute
Journal of the Indian Society of Remote Sensing

Agroforestry is a land use where trees are deliberately grown with agricultural crops either within the field or on the bunds/ boundary. There are innumerable examples of this traditional land use practices in many parts of the world and has long tradition in India too. In the state of Punjab, farmers prefer to grow tree species like Eucalyptus and Populus on their fields with agricultural crops. Reason for adopting these species by the farmers is their fast growth and use of wood in paper and plywood industries. These agroforestry systems are not only remunerative to the farmers but also improve soil fertility of agricultural fields. Area under agroforestry in Bathinda and Patiala districts has been assessed by applying pixel and sub-pixel classifiers on medium resolution LISS III data. In case of pixel based classification, area under agroforestry was estimated to be 7.09 and 4.95 % in the two districts, respectively. Whereas, area under agroforestry come out to be 14.76 and 13.25 %, respectively in case of sub-pixel based classification. Improved results were obtained in case of sub-pixel classifier with more than 85 % accuracy. Hence, sub-pixel classifier may be used with medium resolutions data for accurate assessment of area under agroforestry. © 2016 Indian Society of Remote Sensing Source

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