Biomass production and C-sequestration of Gmelina arborea in plantation and agroforestry system in India |
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| Authors: | SL Swamy Sunil Puri |
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| Institution: | (1) Department of Forestry, Indira Gandhi Agricultural University, Raipur (C.G.), 492 006, India |
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| Abstract: | Tree based land use systems make a valuable contribution to sequester carbon and improve productivity and nutrient cycling
within the systems. This study was conducted to determine biomass production, C-sequestration and nitrogen allocation in Gmelina arborea planted as sole and agrisilviculture system on abandoned agricultural land. At 5 years, total stand biomass in agrisilviculture
system was 14.1 Mg ha−1. Plantations had 35% higher biomass than agrisilviculture system. At 5 years, leaves, stem, branches and roots contributed
4.1, 65.2, 10.0 and 20.7%, respectively to total standing biomass (17.9 Mg ha−1). Over the 5 years of study, trees had 3.5 Mg ha−1 more C and 36 kg ha−1 more N in plantation than agrisilviculture system. Biomass and C storage followed differential allocation. Relatively more
C was allocated in above ground components in plantations compared to agrisilviculture system. C:N ratios for tree components
were higher in stem wood (135–142) followed by roots (134–139), branches (123–128) and leaves (20–21). In agrisilviculture
system crops recommended are: soybean and cowpea in rainy season; wheat and mustard in winter season. After 5 years, soil
organic C increased by 51.2 and 15.1% and N by 38.4 and 9.3% in plantation and agrisilviculture system, respectively. Total
C storage in abandoned agricultural land before planting was 26.3 Mg ha−1, which increased to 33.7 and 45.8 Mg ha−1 after 5 years in plantation and agrisilviculture system, respectively. Net C storage (soil + tree) was 7.4 Mg ha−1 in agrisilviculture system compared to 19.5 Mg ha−1 in G. arborea monoculture stands. The studies suggest that competitive interactions played a significant role in agrisilviculture system.
Plantations were more efficient in accreting C than agrisilviculture system on abandoned agricultural land. |
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| Keywords: | Afforestation Agrisilviculture Environmental benefits Nutrient cycling Resource partitioning |
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