北方土石山区土地利用方式对褐土团聚体稳定性的影响
安 娟1, 王 富2, 吴元芝1, 吴希媛1

(1.山东省水土保持与环境保育重点实验室, 临沂大学 资源环境学院, 山东 临沂 276005; 2.河北环京工程咨询有限公司, 石家庄 050011)

Le Bissonnais法; 团聚体粒径分布; 平均重量直径; 相对消散指数; 可蚀性.

Effect of Land Use Types on Aggregate Stability for Cinnamon Soil in Earth-Rocky Mountainous Area of Northern China
AN Juan1, WANG Fu2, WU Yuanzhi1, WU Xiyuan1

(1.Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection, College of Resources and Environment, Linyi University, Linyi, Shandong 276005, China; 2.Hebei Huanjing Engineering Consulting Co., Ltd., Shijiazhuang 050011, China)

Le Bissonnais method; distribution of soil aggregates; mean weight diameter; relative slaking index; soil erodibility values.

备注

土地利用方式是影响土壤团聚体稳定性的重要因素,但关于北方土石山区土地利用方式对土壤团聚体稳定性的影响仍不清晰。选取北方土石山区耕地、荒地、休闲地和金银花地的褐土为研究对象,基于Le Bissonnais法,分析了快速湿润(FW)、机械振荡(WS)和慢速湿润(SW)处理下团聚体粒径分布特征、稳定性和可蚀性。结果 表明:(1)FW处理后,耕地、荒地和休闲地团聚体集中分布于<0.5 mm,而金银花地则为>0.2 mm; WS和SW处理后,均以>0.2 mm团聚体为主。3种处理下,土地利用方式间2～5 mm团聚体差异最大。(2)土壤团聚体平均重量直径(MWD)表现为:SW>WS>FW,而土壤可蚀性K值则为FW>WS>SW,且相对消散指数显著大于相对机械破碎指数。说明褐土团聚体主要破碎机制是消散作用,其次为机械破坏作用。(3)3种处理下,土壤团聚体MWD均表现为金银花地>休闲地>荒地>耕地。(4)相对消散指数和K值表现为:耕地>荒地>休闲地>金银花地。说明金银花地利用方式可有效提高土壤稳定性,增强土壤抗侵蚀能力。

Land use type is one of the most important factors affecting soil aggregate stability. However, a less information is available for the effect of land use types on soil aggregate stability in the earth-rocky mountain areas of northern China. In this study, the distribution characteristics, stability, and erodibility of soil aggregate in four land use types of cultivated land, waste land, fallow land, and Flos lonicerae land(Lonicera japonica Thunb)were analyzed with the Le Bissonnais method. This method included three treatments, namely fast-wetting treatment(FW), wetting-stirring treatment(WS), and slow-wetting treatment(SW). The results showed that under FW treatment, the size distribution of soil aggregate for cultivated land, waste land, and fallow land was mainly concentrated on <0.5 mm aggregate, >0.2 mm aggregate for Flos Lonicerae land; under WS and SW treatments, >0.2 mm aggregate occupied the largest percentage of soil aggregate for the four land use types; difference in 2～5 mm aggregate was the most pronounced among the four land use types; the mean weight diameters of soil aggregates decreased the order: SW>WS>FW, and soil erodibility values(K)decreased in the sequence: FW>WS>SW; in addition, the relative slaking index(RSI)was significantly greater than the relative mechanical breakdown index(RMI), indicating that slaking was the mainly breakdown mechanism for soil aggregate, followed by mechanical breakdown. Regardless of treatments, the MWD of soil aggregate decreases in the order: Flos lonicerae land>fallow land>waste land>cultivated land. RSI and K decrease in the order: cultivated land>waste land>fallow land>Flos Lonicerae land. The above results indicate that planting Flos lonicerae can greatly improve soil aggregate stability, and strengthen resistance to soil erosion.