合肥城郊典型农业小流域土壤磷形态及淋失风险分析

发布时间：2018-09-12 07:59

【摘要】：为掌握合肥城郊二十埠河某农业小流域土壤磷形态及淋失风险水平,在汇水区采集132份表层土壤样.在分析测试基础上,利用ArcGIS软件中Kriging插值模拟技术,解析总磷(TP)、生物有效性磷(Bio-P)的空间分布特征及土壤有效磷(OlsenP)和易解吸磷(CaCl_2-P)的空间变异性;剖析土壤磷素富集水平;并通过确定土壤磷素的淋失临界值,评估汇水区土壤磷素流失风险.结果表明,汇流区土壤TP和Bio-P含量较高的采样点位主要出现在左支流的上游和两支流交汇处的右侧局部区域;土壤磷形态富集系数由大到小排序为:Ca-P(15.01)OP(4.16)TP(3.42)IP(2.94)Ex-P(2.76)Fe/Al-P(2.43)Olsen-P(2.34);土壤有效磷淋失临界值为18.388 mg·kg~(-1),超过临界值的样本数占样本总数的16.6%,高淋失风险区主要分布在左支流上游、右支流中游及两支流汇流处下游的局部地区.
[Abstract]:In order to understand the phosphorus form and leaching risk level of soil in a small agricultural watershed in the suburb of Hefei, 132 topsoil samples were collected in the catchment area. Based on the analysis and test, the spatial distribution characteristics of total phosphorus bioavailability phosphorus (Bio-P) and the spatial variability of soil available phosphorus (OlsenP) and easily desorbed phosphorus (CaCl_2-P) were analyzed by using Kriging interpolation simulation technology in ArcGIS software, and the enrichment level of soil phosphorus was analyzed. The risk of soil phosphorus loss was evaluated by determining the critical value of soil phosphorus leaching. The results showed that the sampling sites with high soil TP and Bio-P contents were mainly located in the upper reaches of the left tributaries and the right side of the intersection of the two tributaries. The order of P form enrichment coefficient was: Ca-P (15.01) OP (4.16) TP (3.42) IP (2.94) Ex-P (2.76) Fe/Al-P (2.43) Olsen-P (2.34), the critical value of soil phosphorus leaching was 18.388 mg kg~ (-1), the number of samples over the critical value accounted for 16.6% of the total samples. A local area in the middle of the right tributary and the lower reaches of the confluence of the two tributaries.
【作者单位】：合肥工业大学资源与环境工程学院;合肥工业大学土木与水利工程学院;
【基金】：国家自然科学基金项目(51179042,41301537)
【分类号】：X52;X71

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