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江苏省域农田土壤速效钾含量变化及其影响因子研究
全思懋1, 管晓进2, 王绪奎3, 胡 锋1
1.南京农业大学资源与环境科学学院;2.环境保护部南京环境科学研究所;3.江苏省耕地质量与农业环境保护站
摘要:
为研究江苏省域农田土壤速效钾含量的变化特征及其影响因子,根据2008年和2015年江苏省基本农田质量长期监测点实测数据,运用经典统计学和地统计学分析了土壤速效钾的时空变化,运用多因素方差分析探明了成土母质、气候、种植制度、化肥因子对土壤速效钾含量变化的影响及不同影响因子间的交互效应。结果表明:①2015年江苏农田土壤速效钾平均含量为107.9 mg/kg,与2008年相比无显著变化;②与2008年相比,2015年江苏沿海地区农田土壤速效钾含量下降明显,其中盐城部分地区下降最多,达10.0 ~ 30.5 mg/kg;徐淮部分地区土壤速效钾含量增加较多,达10.1 ~ 20.5 mg/kg;③成土母质、气候、钾肥对2008—2015年江苏农田土壤速效钾含量的变化存在显著影响。在钾肥超低投入下速效钾含量的变化主要受成土母质和气候影响,在钾肥低投入及以上水平,速效钾含量的变化主要受钾肥投入影响,说明施用钾肥是提高土壤速效钾含量的主要途径。
关键词:  江苏省  农田土壤  速效钾  时空变化  影响因子
DOI:10.13758/j.cnki.tr.2019.02.007
分类号:S158
基金项目:公益性行业(农业)科研专项(201503121)资助。
Changes of Soil Available Potassium Content in Farmland in Jiangsu Province and Its Influential Factors
QUAN Simao1, GUAN Xiaojin2, WANG Xukui3, HU Feng1
1.College of Resource and Environmental Science,Nanjing Agricultural University;2.Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection;3.Jiangsu Station of Farmland Quality and Agro-Environmental Protection
Abstract:
In order to investigate the change of soil available potassium in farmlands in Jiangsu Province and its influential factors, the data of the long-term monitoring points of farmlands in 2008 and 2015 were used to analyse the temporal and spatial variation of soil available potassium by classical statistical and geostatistical methods, and multifactor analysis was used to study the effects of parent material, climate, cropping system, fertilizer and their interaction on the change of soil available potassium. The results showed that the average content of soil available potassium was 107.9 mg/kg in 2015, insignificantly different with 2008. The contents of soil available potassium in coastal areas decreased obviously in 2015 compared with 2008, and the largest decrease appeared in Yancheng city, decreased by 10.0-30.5 mg/kg; While the largest increase appeared in Xuhuai region, increased by 10.1-20.5 mg/kg. Soil parent material, climate and potash fertilization had significant effects on the content of soil available potassium from 2008 to 2015. Soil parent material and climate dominated the change of soil available potassium under the extreme-low input level of potassium fertilizer, but potash fertilization dominated that under the low and higher input levels of potassium fertilizer, indicating potash fertilization is the main measure to improve soil available potassium content.
Key words:  Jiangsu Province  Farmland soil  Available potassium  Temporal and spatial variation  Influential factors

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