Carbon storage and nitrogen cycling in silvopastoral systems on a sodic in northwestern India |
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| Authors: | B Kaur S R Gupta G Singh |
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| Institution: | (1) Department of Botany, Kurukshetra University, Kurukshetra-, 136119, India;(2) Central Soil Salinity Research Institute, Karnal, India |
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| Abstract: | Tree-based land-use systems could sequester carbon in soil and vegetation and improve nutrient cycling within the systems.
The present investigation was aimed at analyzing the role of tree and grass species on biomass productivity, carbon sequestration
and nitrogen cycling in silvopastoral systems in a highly sodic soil. The silvopastoral systems (located at Saraswati Reserved
Forest, Kurukshetra, 29°4prime; to 30°15prime; N and 75°15prime; to 77°16prime; E) consisted of about six-year-old-tree species
of Acacia nilotica, Dalbergia sissoo and Prosopis juliflora in the mainplots of a split-plot experiment with two species of grasses, Desmostachya bipinnata and Sporobolus marginatus, in the subplots. The total carbon storage in the trees + grass systems was 1.18 to 18.55 Mg C ha−1 and carbon input in net primary production varied between 0.98 to 6.50 Mg C ha−1 yr−1. Carbon flux in net primary productivity increased significantly due to integration of Prosopis and Dalbergia with grasses. Compared to 'grass-only' systems, soil organic matter, biological productivity and carbon storage were greater
in the silvopastoral systems. Of the total nitrogen uptake by the plants, 4 to 21 per cent was retained in the perennial tree
components. Nitrogen cycling in the soil-plant system was found to be efficient. Thus, It is suggested that the silvopastoral
systems, integrating trees and grasses hold promise as a strategy for improving highly sodic soils.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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| Keywords: | carbon flux fine roots herbaceous vegetation litterfall nitrogen uptake |
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