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为揭示晋西黄土区不同土地利用方式下有机质的土层变异特征及其影响因素,选取刺槐林地、油松林地、荒草地和农田(玉米)坡地4种样地,分析土地利用方式、坡位、土层深度和土壤水分含量对土壤有机质含量的影响。结果表明,不同土地利用方式下土壤有机质含量大小顺序为:油松林地>刺槐林地>荒草地>农地;坡位对土壤有机质含量及变异系数的影响复杂,难以出现一致性规律;随土层深度增加,不同土地利用方式下土壤有机质含量差异显著,但均随着土层深度的增加而不断减小且变异性减弱;两种林地和草地32~160 cm土层土壤水分与有机质含量呈显著正相关关系,而对于表层土壤和农地二者关系不密切。逐步回归分析表明,土层深度对土壤有机质空间变异影响最大。研究结果对晋西黄土区水土保持中林草措施的配置和生态环境建设有一定的参考价值。
In order to reveal the characteristics of soil organic matter variation and its influencing factors under different land use patterns in the Loess Plateau of Shanxi, four kinds of plots were selected from four sites, namely, the black locust, the pine forest, the grassland and the farmland (maize) , Soil depth and soil moisture content on soil organic matter content. The results showed that the sequence of soil organic matter under different land use types was as follows: Pinus tabulaeformis forest> Robinia pseudoacacia forestland> Wild grassland> farmland. The influence of slope position on soil organic matter content and coefficient of variation was complex, Depth and soil organic matter content under different land use types were significantly different, but both decreased with the increase of soil depth and the variability was weakened. Soil moisture and organic matter content in 32 ~ 160 cm soil layer in both forestland and grassland were significantly Positive correlation, while the relationship between surface soil and farmland is not close. Stepwise regression analysis shows that soil depth has the greatest effect on the spatial variability of soil organic matter. The results of this study have certain reference value for the allocation of forest and grass measures and ecological environment construction in soil and water conservation in the Loess Area in western Shanxi.