Soil aggregates and organic carbon in four plantations on the western edge of the Sichuan Basin
The objective of the study was to investigate soil aggregates and organic carbon content of four plantations of native trees on the western edge of the Sichuan Basin.Using the dry sieve method,soil aggregates and organic carbon content at two depths (0-20 cm and 20-40 cm) in four plantations,namely,plantations of Cryptomeriafortunei,Michelia wilsonii,Phoebe zhennan,and Quercus acutissima on the edge of the Sichuan Basin were investigated.Soil aggregates from the four plantations were mainly larger than 2 mm.Moreover,soil aggregates ranging from 0.5 mm to 0.25 mm accounted for only 1.07％-3.39％ of all aggregates.Organic carbon in soil was approximately twice as much at a depth of 0-20 cm as at 20-40 cm in the C.fortunei plantation,but the differences in soil organic carbon between the two layers were relatively small in the other three plantations.Additionally,organic carbon in soil aggregates with smaller diameters (＜ 2 mm) was higher than that in aggregates with a larger diameter (＞ 2 mm).The organic carbon content in aggregates ＞ 2 mm in diameter ranged 72％-87％ in the four plantations and was relatively high in soil aggregates with smaller diameters.Based on characteristics of soil aggregates and organic carbon content,C.fortunei and O.acutissima are more suitable for local vegetation restoration than either P.zhennan or M.wilsonii.
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NSTL
万方数据
维普
