喀斯特坡地不同土地利用类型土壤水分差异性研究

Variability in soil moisture under five land use types in Karst hillslope territory

  • 摘要: 对比分析桂西北喀斯特坡地5种土地利用类型0~20cm表层土壤含水量的差异,结果表明:喀斯特生境条件下坡地土壤含水量受降水的影响明显,雨季和旱季差异显著。各土地利用类型间,灌丛类型由于枯枝落叶层而增强了土壤的保水持水能力;生态恢复林(板栗、木豆)种植初期,土表接近于裸地,蒸发强烈,应采取一定的蓄水保墒措施;混种有匍匐类作物的复垦坡耕地,其土壤水分条件则与撂荒多年草地相似。比较土壤层间含水量的季节差异,灌丛类型土壤有明显的层间蓄水补水能力。喀斯特山地应通过建立合理的土地利用类型,改变地表覆被状况进而改善土壤水分条件,为生态重建服务。

     

    Abstract: Hillslope soil moisture content in a typical Karst territory of Huanjiang County,Guangxi Autonomous Region was observed and gauged from four layers(0~5cm, 5~10cm, 10~15cm and 15~20cm) under five different land use types. Results show that in Karst Areas, soil moisture content is very much influenced by precipitation,with conspicuous moisture difference between rainy and drought seasons. Shrubbery has the capacity to enhance soil water conservation by a factor of a litter. At the incipient stage of eco-restoration,soil moisture under chestnut and pigeon pea is very much alike,being similar to that of bare soil. When under creeping vegetation,slope soil moisture condition improves at a factor equal to that of grassland. Comparison of soil moisture content in the different layers under the five land use types for three different seasons—rainy season,rain-drought transition season and drought season show superiority of shrubbery over the other vegetations in their capacity to conserve and distribute water in the soil layers. Therefore, in the Karst mountain area of Huanjiang County, it is possible to improve soil moisture condition by rational land use,especially through ecological restoration.

     

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