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运用空间代替时间法,对关岭石漠化区小流域裸地、草地、灌木林、乔木林和顶级群落5个植被演替阶段下土壤进行分析,探究0~20 cm、20~40 cm、40~60 cm三个层次下土壤容重、土壤自然含水率和土壤饱和含水率的变化特征。结果表明:演替过程中,灌乔阶段土壤容重显著降低,而这种降低是从浅土壤层(0~40 cm)开始向更深层(40~60 cm)土壤进行的;土壤自然含水率和饱和含水率显著地提高。随着演替等级的升高,不同土层间水分含量发生变化,水分含量最高的土层开始从深层向浅层转移,浅层土壤的保水能力随着演替进行开始增强,而深层土壤保水能力相对减弱。
By using spatial substitution time method, the soil under five succession stages of vegetation in the bare watershed, grassland, shrub forest, arbor forest and top community in the Guanling rocky desertification area was analyzed to investigate the effects of 0-20 cm, 20-40 cm, Characteristics of Soil Bulk Density, Soil Moisture Content and Soil Saturated Moisture at 40 ~ 60 cm Three Levels. The results showed that during the succession stage, the soil bulk density decreased significantly during the irrigation of Qiaojiao stage, and the decrease started from shallow soil layer (0 ~ 40 cm) to the deeper soil layer (40 ~ 60 cm). The soil natural water content and Saturated moisture content increased significantly. With the increase of the succession level, the moisture content of different soil layers changed. The soil with the highest moisture content began to transfer from deep to shallow soil. The water retention capacity of shallow soil began to increase with succession, while the deep soil water conservation Relatively diminished ability.