论文部分内容阅读
土壤速效磷钾是评价土壤肥力和环境质量的重要指标之一。本文根据780个表层土壤(0～30 cm)样点数据,采用常规统计、地统计学和地理信息系统相结合的方法研究了四川天全河流域土壤速效磷钾的空间分布特征及其影响因素。结果表明,该流域土壤速效磷含量达(1.40±0.52)g/kg,碱解氮含量达(125.79±56.24)mg/kg。水稻土和潮土速效磷含量高于黄壤和紫色土,土壤速效钾含量则为水稻土>黄壤>潮土>紫色土。它们的空间分布均呈由西向东逐渐减少的趋势。成土母质、地形部位、土地利用和耕地种植制度都极显著地影响土壤速效磷和速效钾的含量。
Soil available P and K is one of the most important indicators to evaluate soil fertility and environmental quality. Based on the data of 780 surface soil samples (0 ~ 30 cm), this paper studied the spatial and temporal distribution of available P and K in the Tianhe River basin in Sichuan by means of conventional statistics, geostatistics and GIS. . The results showed that available phosphorus was 1.40 ± 0.52 g / kg and total available nitrogen was 125.79 ± 56.24 mg / kg. The contents of available P in paddy soil and alluvial soil were higher than those in yellow soil and purple soil. The available potassium content was paddy soil> yellow soil> alluvial soil> purple soil. Their spatial distribution tends to decrease gradually from west to east. The soil parent material, topography, land use and cultivated land system all significantly influence the contents of available P and available K in the soil.