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以典型紫色土丘陵区万安小流域(12.10 km2)为研究区域,通过分析2011年4月(旱季)和8月(雨季)采集的552个表层土壤样品,采用传统统计学和地统计学的方法对小流域土壤全磷的时空变异特征进行了研究。结果表明:(1)流域不同土地利用类型土壤全磷含量均值介于0.42~0.73 g kg-1,土地利用类型之间全磷含量具有显著差异,呈现为水旱轮作田>旱地>林地;(2)相同土地利用类型旱季(4月)、雨季(8月)土壤全磷含量无显著差异;(3)水旱轮作田、旱地土壤全磷的中等空间相关性,表明其受到随机性因素和结构性因素的共同影响,而林地的强烈空间相关性表明其土壤全磷的空间分布特征主要受到结构性因素的作用;这表明在确认磷负荷风险地点、评估污染物迁移潜力及流域土壤资源管理时,应考虑不同土地利用类型条件下全磷时空特征。
Taking Wanan small watershed (12.10 km2), a typical purple hilly region as the research area, 552 topsoil samples collected in April (dry season) and August (rainy season) in April 2011 were analyzed using traditional statistics and geostatistics Methods The spatio-temporal variations of soil total phosphorus in small watershed were studied. The results showed that: (1) The average total phosphorus content of different land use types in the watershed ranged from 0.42 to 0.73 g kg-1. There was a significant difference in total phosphorus content between different land use types, 2) There was no significant difference in soil total P between the same land use types in dry season (April) and rainy season (August); (3) The moderate spatial correlation of total P in irrigated fields and dry land showed that it was affected by randomness and The strong spatial correlation of woodland indicates that the spatial distribution characteristics of soil total phosphorus are mainly affected by structural factors. This indicates that in identifying the risk of phosphorus load, the potential of pollutant migration and the assessment of soil resource management , We should consider the temporal and spatial characteristics of total phosphorus under different types of land use.