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对孟加拉国丘陵地带Mro部落经营的桔园与灌木林35%和55%两种坡地土壤物理性质进行了比较与评价。每一块用地内挖掘3个土壤剖面采集不同深度(0-5cm,5-15cm and 15-30cm)的土壤样品,测定土壤水分、有机质含量和土壤密度。最大持水量、田间持水量、干或湿土壤容重和土壤孔隙度的测定仅限于表层土壤。两种坡地桔园3个深度的土壤水分含量均显著高于灌木林地相同深度的土壤水分。桔园在55%坡地内土壤有机质含量低于林地含量值,而在35%坡地内的含量值则高于林地值。两块样地内上述两项测定值均在表层土壤中最高,且随土层深度的增加而降低。与灌木林地比较,桔园地表层土壤最大持水量、孔隙度和3个不同深度的土壤密度均较低。两块用地内不同坡地的表层土田间持水量有所差异,且桔园地干或湿表层土壤容重高于林地内的数值。表5参23。
The physical properties of 35% and 55% of the slopes of orange and shrubbery run by the Mro tribe in the hilly region of Bangladesh were compared and evaluated. Three soil profiles were excavated from each site to collect soil samples of different depth (0-5cm, 5-15cm and 15-30cm) for determination of soil moisture, organic matter content and soil density. Maximum water holding capacity, field capacity, dry or wet soil bulk density, and soil porosity were measured in the topsoil. The soil water content of the three depths of orange orchard on two slopes was significantly higher than that on the same depth of shrubland. The content of soil organic matter in the citrus orchard was lower than that in the 55% slope, while the content in the 35% slope was higher than the value of the forest. The above two measured values in the two plots were the highest in the surface soil and decreased with the depth of the soil. Compared with the shrubbery, the maximum water holding capacity, the porosity and the soil densities of three different depths of the surface soil of the orange garden were lower. The water holding capacity of topsoil with different slopes in the two plots was different, and the bulk density of dry or wet surface soils in the orange groves was higher than that in the woodlands. Table 5 Reference 23.