河南农业科学 ›› 2022, Vol. 51 ›› Issue (11): 65-72.DOI: 10.15933/j.cnki.1004-3268.2022.11.008

• 农业资源与环境 • 上一篇    下一篇

典型白浆土区耕层土壤速效钾空间异质性研究

侯永华1,王霞1,赵映慧1,罗冲2,刘焕军2,马士耐1,王烁1   

  1. (1.东北农业大学公共管理与法学院,黑龙江 哈尔滨 150030;2.中国科学院东北地理与农业生态研究所,吉林 长春 130012)
  • 收稿日期:2022-08-24 出版日期:2022-11-15 发布日期:2023-01-09
  • 通讯作者: 赵映慧(1976-),男,四川广元人,副教授,博士,主要从事城市地理与区域发展研究。E-mail:zhaoyhneau@163.com
  • 作者简介:侯永华(1997-),男,山西阳泉人,在读硕士研究生,研究方向:耕地质量评价。E-mail:hyh140322@outlook.com
  • 基金资助:
    国家重点研发计划项目(2021YFD1500100);王宽诚教育基金会资助项目

Spatial Heterogeneity of Available Kalium in Cultivated Layer of Typical Albic Soil

HOU Yonghua1,WANG Xia1,ZHAO Yinghui1,LUO Chong2,LIU Huanjun2,MA Shinai1,WANG Shuo1   

  1. (1.School of Public Administration and Law,Northeast Agricultural University,Harbin 150030,China;2.Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Changchun 130012,China)
  • Received:2022-08-24 Published:2022-11-15 Online:2023-01-09

摘要: 了解土壤养分的空间异质性是实现精准施肥与农业可持续管理的重要基础,为精准获取典型白浆土区耕地土壤养分空间分布信息,以典型白浆土区0~20 cm耕层土壤速效钾(Available kalium,AK)为研究对象,结合实地采样点与协同克里格(Cokriging,COK)插值法,对比使用不同辅助变量的插值精度,分析典型白浆土区AK空间异质性。结果表明,研究区内AK含量呈南高北低,介于92.00~364.00 mg/kg,平均为171.78 mg/kg,处于较高水平。有效磷(Available phosphorus,AP)等土壤因子、高程(Elevation,E)等地形因子、遥感指数如归一化差异植被指数(Normalized difference vegetation index,NDVI)等均与AK含量存在显著相关关系,而且加入上述各辅助变量的克里格(协同克里格,COK)插值法精度更高,即COK>OK(普通克里格)。其中,将AP作为辅助变量时精度最高,交叉验证RMSE 为36.225 mg/kg。综上,选取最佳辅助变量更有助于分析研究区内AK空间异质性。

关键词: 白浆土, 空间异质性, 耕层土壤, 速效钾, 协同克里格

Abstract: Understanding the spatial heterogeneity of soil nutrients is an important basis for achieving precise fertilization and sustainable management of agriculture. In order to accurately obtain the spatial distribution information of soil nutrients in cultivated land in typical albic soil area,the content of available kalium(AK)in 0—20 cm topsoil of typical albic soil area was taken as the research object,and the spatial heterogeneity of AK in typical albic soil area was analyzed by comparing the interpolation accuracy of different auxiliary variables with field sampling points and cokriging interpolation method.The results showed that the AK content in the study area was high in the south and low in the north,ranging from 92.00 to 364.00 mg/kg,with an average of 171.78 mg/kg,showing a high level.Soil factors such as available phosphorus(AP),topographic factors such as elevation(E),and remote sensing indexes such as normalized difference vegetation index(NDVI)were all significantly correlated with AK content,and the accuracy of the kriging interpolation method with the above auxiliary variables(cokriging,COK) was higher,that is,COK>OK(ordinary kriging). Among them,the accuracy was the highest when AP was used as an auxiliary variable,and the cross‑validation RMSE was 36.225 mg/kg.In summary,selecting the best auxiliary variables is more helpful to analyze the spatial heterogeneity of AK in the study area.

Key words: Albic soil, Spatial heterogeneity, Cultivated soil, Available kalium, Cokriging

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