摘要
为了解紫色丘陵区土壤养分含量分布及空间变异特征,对因地制宜施肥给予科学指导,笔者利用地统计学方法,以重庆市铜梁县为例,对紫色丘陵区土壤中速效氮、磷、钾、有机质及土壤pH进行空间分布变异特征研究。结果表明：速效氮、磷、钾及有机质的均值分别为105.86mg/kg、7.19mg/kg、81.31mg/kg、22.89g/kg,均属于中低等水平;土壤pH主要集中在6.5附近,土壤偏酸性。土壤有效磷变异系数最大,为77.61%;其次是速效钾、有机质和碱解氮,均属于中等变异性强度;相对而言,pH分布最为稳定,变异系数为17.78%。从空间插值图可知,碱解氮含量大都在114.42~148.39mg/kg之间变化;有效磷含量基本都小于14.35mg/kg;速效钾分布最不规律,约1/2区域的速效钾含量在60.56~74.82mg/kg之间;有机质含量则主要集中分布在15.27~33.77g/kg;大部分地区土壤pH在5.2~6.5之间,进一步说明该区域土壤偏酸性。
In order to discover the content and spatial variability of purple soil nutrients in southwest China and to make proper fertilization recommendations adapted to the local conditions, the author combined geostatistics with GIS to analyze the spatial variability of soil nutrients in topsoil （0-20 cm） in Tongliang, Chongqing. The results showed that the mean of available N, available P, available K and Organic matter were 105.86 mg/kg, 7.19 mg/kg, 81.31 mg/kgand 22.89 g/kg, respectively, and they were all in middle or low level. Soil pH was mainly around 6.5, which indicated that the soil was acidic. The coefficient of variation of available P was 77.61%, which was the highest among the five nutrients, followed by available K, organic matter and available N, and they all expressed medium variability. While the soil pH was more stable whose coefficient of variation was 17.78%. The spatial interpolation figure indicated that the content of available N was mainly centralized between 114.42-148.39 mg/kg, and a content of available P was lower than 14.35 mg/kg, with a lowest value of 1.00 mg/kg. The distribution of available K showed no regularity and thecontent of available K in about half of the area was between 60.56-74.82 mg/kg, followed by 79.83- 94.09 mg/kg. The content of organic matter was mainly centralized between 15.27-33.77 g/kg and soil pH in most area was between 5.2 to 6.5, which could be another proof to the conclusion that the soil was acidic.
出处
《中国农学通报》
CSCD
北大核心
2011年第20期216-223,共8页
Chinese Agricultural Science Bulletin
基金
国家科技支撑计划资助项目(2008BABA7B09
2007BAD87B10)
关键词
紫色丘陵区
土壤养分
空间变异
purple hilly region
soil nutrient
spatial variability
