通过对金水河流域矿物元素生物地球化学交换模式的研究,得到以下结论:(1)在不同空间位置的矿物元素对河水的水质贡献率不相同.河水成分贡献主要来源于硅酸盐风化,在金水河流域生态系统不同空间位置矿物元素对河水水质贡献率方程为:YRiverwater=0.242+0.203XRain+0172XSoilwater+0.471Xsoilwater(r2=0.55).(2)固-液相界面(土壤-土壤水溶液)离子交换过程拟合表明:离子交换过程符合二、三次曲线模型.(3)区域内碳酸盐岩含较少的Na+和K+,且受酸雨等影响.Na+在土壤-土壤溶液之间的分配行为可能加重土壤盐碱化的趋势.土壤和枯枝落叶层HCO3和TDS值均处于稳定的范围内.(4)输入性污染分析表明,流域内土壤基本表现出物理性质改善;但却表现出贫养化和生物地球化学性质恶化的极化趋势.人为活动输入污染物影响显著,在全球变化背景下,酸雨和干旱加剧了水溶液组成的变化.%Following results are achieved through investigations on mineral elements exchange patterns in biogeochemical cycles in Jinshuihe River Basin. Firstly, variability of river water quality is determined by different spatial patterns of mineral elements.Contribution of river water mainly comes from silicate weathering components. Contribution ratio function of river water quality can be expressed by regression model as, YRivrwatcr = 0.242+0.203 XRain+0172 XLitter+0.471 XSoilwater (r2 = 0.55). Secondly, ion exchange process of solid-liquid interface (soil-soil solution) can be regressed by fitting curve models of quadratic and cubic. Thirdly,carbonate silicate contains small portion of Na+ and K+, and is affected by acid rain. However, Na+ aggravates trends of soil salinization in exchange process of solid-liquid interface. Values of HCO3- and TDS in soil and litter are in stable ranges. Finally, soil quality improves in physical properties, but depletes in nutrient components, and deteriorates within biogeochemical properties. Acid rain and drought accelerate changing components of river water. The pollution of human activities significantly affected input of pollutants.
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