论文部分内容阅读
以霍林河下游洪泛区湿地为研究区,采用网格采样法研究了土壤pH值和土壤含水量的时空变化及其相互关系。结果显示,研究区湿地土壤含水量和pH值存在明显的季节性差异,7月份土壤含水量高于9月份土壤,但7月份土壤pH平均值则低于9月份,9月份湿地土壤,尤其是亚表层发生明显碱化。湿地土壤含水量和pH值均呈现出条带状和斑块状的空间分布格局,尤其在9月份的空间变异性较高,且土壤pH值与土壤含水量间存在较显著的负相关关系,即含水量高的区域对应土壤pH值较低。土壤含水量和pH值的回归分析表明当土壤pH值>8.8时,非线性回归更适宜描述研究区土壤含水量和土壤pH值的显著负相关关系。
Taking the floodplain wetland in the lower Huolin River as the research area, the temporal and spatial variations of soil pH and soil water content and their correlations were studied by the grid sampling method. The results showed that the wetland soil moisture content and pH value of the study area had obvious seasonal differences. The soil moisture content in July was higher than that of September soil. However, the average soil pH value in July was lower than that in September and September wetland soil, especially Sub-surface obvious alkalization occurred. The spatial distribution pattern of soil water content and pH values of wetlands showed strip and patchy patterns. Especially in September, the spatial variability was high, and there was a significant negative correlation between soil pH value and soil water content. That is, the area with high water content corresponds to the lower pH value of the soil. Regression analysis of soil water content and pH value showed that the nonlinear regression was more suitable to describe the significant negative correlation between soil moisture content and soil pH value when soil pH> 8.8.