Li Zhi, Liu Wen-Zhao, Wang Qiu-Xian
College of Resources and Environment, Northwest A & F University, Yangling 712100, Shaanxi, China.
Ying Yong Sheng Tai Xue Bao. 2008 Jun;19(6):1303-8.
Soil samples under different land use types and at different slope positions in the Wangdonggou watershed of loess tableland area were collected to determine their particle composition, bulk density (pb), and saturated hydraulic conductivity (Ks), and the effects of land use type and slope position on the soil physical properties were studied in virtue of the variation coefficient and non-parameter tests. The results showed that the physical properties of soil varied in horizontal direction and vertical profile, however at the same slope position or under the same land use type, the pb and particle composition were similar. In horizontal direction, Ks varied strongly, slit content and pb varied weakly, and clay and sand contents varied medially. In vertical profile, soil particles had a continuous distribution, but pb and Ks varied greatly in 0-25 cm layer. With the slope degree descended, soil contained more clay and had a higher pb, and Ks increased. At upper and middle slopes, soil physical properties were similar, and thus, could be merged into one in related researches. There was a significant difference in soil physical properties between grassland and other land use types, which was mainly due to the effects of slope position, but the soil physical properties in farmland and orchard were similar, indicating the important effects of human activities.
采集黄土塬区王东沟流域不同土地利用类型及不同坡位的土壤样本，测定其颗粒组成、容重（pb）和饱和导水率（Ks），并借助变异系数和非参数检验研究土地利用类型和坡位对土壤物理性质的影响。结果表明，土壤物理性质在水平方向和垂直剖面上均有变化，然而在相同坡位或相同土地利用类型下，pb和颗粒组成相似。在水平方向上，Ks变化强烈，粉粒含量和pb变化较弱，黏粒和砂粒含量变化中等。在垂直剖面上，土壤颗粒呈连续分布，但pb和Ks在0-25cm土层变化较大。随着坡度降低，土壤黏粒含量增加，pb升高，Ks增大。在上坡和中坡，土壤物理性质相似，因此在相关研究中可合并为一个。草地与其他土地利用类型的土壤物理性质存在显著差异，这主要是由于坡位的影响，但农田和果园的土壤物理性质相似，表明人类活动的重要影响。
