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Soil Aggregate- and Particle-Associated Organic Carbon under Different Land Uses in Nepal

^a Dep. of Plant and Environmental Sciences, Norwegian Univ. of Life Sciences, PO Box 5003, 1432 Ås, Norway
^b Dep. of International Environment and Development Studies, NORAGRIC, Norwegian Univ. of Life Sciences, PO Box 5003, 1432 Ås, Norway
^c Carbon Management and Sequestration Ctr, Ohio State Univ., Columbus, OH 43210
^d Dep. of Biological and Environmental Sciences, School of Science, Kathmandu Univ., Dhulikhel, Nepal

View larger version (38K): [in this window] [in a new window]   Fig. 1. Location map of the study area with reference to Nepal and South Asia.

View larger version (27K): [in this window] [in a new window]   Fig. 2. Annual rainfall and average maximum and minimum temperature in Pokhare Khola watershed from 1987 to 2001.

View larger version (56K): [in this window] [in a new window]   Fig. 3. Relative share of soil organic carbon (SOC) in soil by different aggregate size fractions under different land uses (bari, rainfed upland; khet, irrigated lowland; DF, degraded forest and shrub land; DS, dense Shorea forest; PS, pine–Shorea forest; SC, Schima–Castanopsis forest; SPS, Schima–pine–Shorea forest). Mean ± SE; values with different letters, uppercase for land uses and lowercase for aggregate size classes, are significantly different at P < 0.05 (Student–Newman–Kuels = 0.05).

View larger version (18K): [in this window] [in a new window]   Fig. 4. Soil organic carbon (SOC) content as a function of (a) clay (P = 0.065) and (b) clay plus silt content of soil (P = 0.002).

View larger version (12K): [in this window] [in a new window]   Fig. 5. Relationship between clay and clay-associated soil organic carbon (SOC) (P = 0.002).