论文部分内容阅读
对苏州市城市边缘带样区土壤进行系统的采样分析,应用一系列数理统计分析方法,阐述了研究区土壤主要肥力要素的空间变异特征及其影响因素;利用数值化土壤综合肥力评价手段,估算了研究区土壤数值化肥力质量指数及其空间分异规律;并通过与研究区历史数据对比,揭示了过去20年来苏州市城市边缘带土壤主要肥力要素及综合肥力质量的动态演变趋势。结果表明,研究区表层土壤电导率、CEC以及养分含量空间变异强烈,表现出城市边缘带土壤肥力分布的重要空间特征。经过过去20年的农业生产实践,研究区土壤主要养分含量总体上呈现增长趋势,土壤综合肥力质量明显提高。但土壤全K含量却呈下降趋势,表明土壤养分不均衡现象依然存在。土壤pH大幅下降,土壤酸化现象严重。选取的10个样本土属中,平均综合肥力质量指数增高和降低的土壤数量分别为5个和4个。同时,土壤综合肥力质量空间可变性显著增大,最大变幅与变异系数明显升高,反映出快速工业化、城市化与农业集约化背景下土壤资源利用方式与利用强度的变化对土壤质量结构及其空间变异特征的重要影响。
This paper systematically sampled and analyzed the soils in the urban fringe zone of Suzhou City and applied a series of mathematical statistics and analysis methods to expound the spatial variation characteristics of the main soil fertility factors and their influencing factors in the study area. Using the method of numerical soil comprehensive fertility evaluation, Through the comparison with the historical data of the study area, the dynamic evolution trend of soil main fertility factors and integrated fertility quality in the urban fringe of Suzhou City was revealed. The results showed that the spatial variability of surface soil electrical conductivity, CEC and nutrient content in the study area was strong, showing the important spatial characteristics of soil fertility distribution in the urban fringe. After the past 20 years of agricultural production practice, the main soil nutrient content in the study area showed an overall trend of increase, and the soil comprehensive fertility quality was significantly improved. However, the content of total K in soil showed a downward trend, indicating that the imbalance of soil nutrients still exists. Soil pH dropped significantly, soil acidification is serious. Among the 10 soil samples selected, the average soil fertility index increased and decreased by 5 and 4, respectively. At the same time, the spatial variability of soil fertility quality increased significantly, and the maximum amplitude and coefficient of variation significantly increased, reflecting the change of soil resource utilization and utilization intensity in the context of rapid industrialization, urbanization and agricultural intensification, Its spatial variation has an important impact.