喀斯特山区水库底泥理化性状调查——以贵阳市阿哈水库为例

Investigation on Physical and Chemical Properties of Sediment in Karst Mountain Reservoir——A Case Study of Aha Reservoir in Guiyang

为调查阿哈水库底泥的理化性质,根据阿哈水库地形地貌、入库河流和出库口分布等特点,采集底泥样品12个,测定阿哈水库底泥的理化性状。结果表明:底泥的机械组成以壤质粘土与粉砂质粘土为主,含水量、比重和孔隙度的平均值分别为77.9、2.52 g/cm^3、36.1%,含水量较高,比重较适宜,孔隙度较低,各个指标变异系数范围为5.56~24.25%,空间变异性明显;底泥pH、还原性物质总量、活性还原性物质、全氮、铵态氮和硝态氮的平均含量分别为7.21、22.46、17.85 cmol/kg,3700、160.22、51.09 mg/kg,pH呈中性,还原性物质总量、活性还原性物质、全氮、铵态氮和硝态氮含量均较高,且各指标的变异系数变幅较大,为3.05~46.56%,空间变异性较强。

In onder to investigate the physical and chemical properties of ment samples were collected to determine the physicochemical properties of sediment in Aha Reservoir accond- ing to the topography of Aha Reservoir, the distribution of inbound river and the mechanical properties of the sediments were mainly composed of loamy clay and silty clay. The average values of water content, specific gravity and porosity were 77. 9 , 2. 52 g/cm3 and 36. 1% , respectively. With a relatively high water content, suitable specific gravity and lw porosity, the coefficient of variation of eachindex ranged from 5. 56 to 24. 25% , and the spatial variability was obvious.amount of reducing substances, the active reductive substances, total nitrogen, ammonium nitrogen and ni-trate nitrogen were 7. 21 , 22. 46 cmol/lcg, 17. 85 cmol/lcg, 3700,160. 22 and 51. 09 mg/kg, resjDectively. pH was neutral, the contents of ammonium nitrogen and nitrate nitrogen were botli high, and the coefficients ofvariation of each index ranged from 3.05 to 46. 56% with strong spatial variability. Aha resagricultural resource use need to adjust tiie quality of a material, increase the porosity, removal of reducgents, improve the efficacy and safety of tlie sediment utilization.