Dehydrogenase activity and VAM fungi in tree-rhizosphere of agroforestry systems in Indian arid zone |
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| Authors: | Rajendra Prasad and R S Mertia |
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| Institution: | (1) Central Arid Zone Research Institute, Regional Research Station, Jaisalmer, Post Box 63, 345001, India |
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| Abstract: | Biological activity in tree rhizosphere and association of VAM fungi with tree-roots could be used as selection criteria for
agroforestry trees in arid ecosystems. Dehydrogenase activity and VAM fungi association in rhizosphere of six agroforestry
trees (Azadirachta indica, Acacia tortilis, Eucalyptus camaldulensis, Prosopis cineraria and Tecomella undulata) were studied under irrigated and rainfed conditions in the arid zone of India. Higher dehydrogenase activity (9.5 to 16.8∼p kat g soil−1), root colonization (58.3 to 68.5%) and spore density (132.5 to 234.7 spores 100 g soil−1) were observed in tree rhizosphere as compared to that in non-rhizosphere (7.4, 37.7 and 44.4). Irrigation had increased
dehydrogenase activity by 22.1% while it reduced root colonization and spore density by 14.2% and 16.2%, respectively. Trees
of A. indica had registered maximum growth while E. camaldulensis the least. Findings suggest that selection of A. nilotica, A. indica, and T. undulata for plantations of agroforestry in arid region would reduce the risk and ensure sustainability of the agroforestry system. |
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| Keywords: | Acacia nilotica Azadirachta indica Prosopis cineraria Soil enzyme Tree selection VAM fungi |
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