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对广西弄拉表层岩溶动力系统中森林和灌丛的土壤容重、非毛管孔隙度等物理性质以及土壤CO2、土壤水和泉水水化学特征进行了研究.结果表明:森林和灌丛环境下的土壤物理性质存在显著性差异,影响土壤含水量.土壤水固定CO2浓度和土壤CO2之间存在显著的负相关关系.森林土壤水中游离CO2浓度为0,灌丛为5.33×103mg.m-3.土壤水和泉水中pH、Ca2+、Mg2+、Cl-浓度存在一定的负相关关系,其K+、Na+、HCO3-浓度和有机碳含量存在正相关关系.经过雨水的淋溶,土壤层各离子浓度均大幅度增加,其溶蚀能力大大增强.森林环境下的岩溶作用稳定但强度大,灌丛环境下的岩溶作用活跃但强度小.
The physical properties such as soil bulk density, non-capillary porosity and the hydrochemical characteristics of soil CO2, soil water and spring water in the epikarst dynamic karst system of Guangxi Gulong were studied. The results showed that the soil There was a significant negative correlation between physical properties and soil moisture content. There was a significant negative correlation between soil CO2 concentration and soil CO2 concentration. The concentration of free CO2 in forest soil water was 0 and that in shrub was 5.33 × 103 mg.m-3. There was a negative correlation between pH, Ca2 +, Mg2 + and Cl- concentration in water and spring water, and there was a positive correlation between K +, Na +, HCO3- and organic carbon content. After rainfall leaching, the ion concentrations in soil layer were significantly Increase, and its corrosion ability is greatly enhanced.The karstification under the forest environment is stable but strong, and the karstification under the scrubland environment is active but the intensity is small.