40年来宁乡市稻田土壤肥力时空变异分析
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作者单位:

(1.湖南土壤肥料研究所,湖南 长沙 410125;2.中国农业科学院农业资源与农业区划研究所 /耕地培育技术国家工程实验室,北京 100081;3.湖南省农业科学院,湖南 长沙 410125)

作者简介:

孙耿(1984-),男,湖南邵阳人,助理研究员,在读博士研究生,主要从事土壤生态研究。E-mail:sungeng427@163.com。

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基金项目:

基金项目:国家重点研发计划课题“高产稻田的肥力变化与培肥耕作途径”(2016YFD0300901);湖南省农业科技创新资金项目(2019LS03-4)。


Spatio-temporal variation of paddy soil fertility in Ningxiang city during the past 40 years
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Affiliation:

(1. Hunan Soil andFertilizer Institute,Changsha Hunan410125;2. Institute of Agricultural Resources and Regional Planning,ChineseAcademy of Agricultural Sciences / National Engineering Laboratory for Improving Quality of ArableLand,Beijing100081;3. Hunan Academy of AgriculturalScience,Changsha Hunan410125)

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    摘要:

    土壤养分具有较强的时空变异性,明确 40年来县域稻田土壤肥力时空变异特征,能为稻田土壤培肥管理提供科学指导。通过收集整理宁乡市第二次土壤普查及 2018年稻田土壤肥力数据,以地统计学为基础,借助GS+7.0、ArcGIS和 R等软件进行分析。结果表明,40年来稻田土壤有机质、全氮、碱解氮、有效磷、速效钾及综合肥力指数分别增加13.1%、98.5%、20.1%、98.2%、13.7%和47.9%,但 pH降低0.58,土壤呈酸化趋势;土壤有效磷空间相关性较弱,受随机因素影响较大;有机质、全氮、碱解氮、速效钾、pH和综合肥力指数空间相关性较强,受地形和人为因素的共同作用;有机质、全氮和碱解氮是土壤综合肥力指数的重要因素,全氮的大幅增加是土壤综合肥力指数提升的关键驱动原因;当前水稻产量与土壤综合肥力指数呈极显著正相关。

    Abstract:

    Soil nutrients have strong temporal and spatial variability.Figuring out the temporal and spatial variation characteristics of paddy soil fertility in the past 40 years could provide guidance for the soil fertility management of paddyfield.The second soil survey and 2018 paddy soil fertility data in Ningxiang city were collected and sortedout.Based ongeostatistics,the software such as GS7.0+,ArcGIS and R were used for analysis.The results showed that soil organicmatter(SOM),total nitrogen(TN),alkali hydrolyzable nitrogen(AN),available phosphorus(AP),availablepotassium(AK)and comprehensive fertility index(IFI)increased by13.1%,98.5%,20.1%,98.2%,13.7% and47.9% in the past 40 years,respectively,while pH decreased by0.58,the soil showed acidizing trend.AP showedweak spatial correlation and was greatly affected by random factors.SOM,TN,AN,AK,pH and IFI had strong spatialcorrelation,which were affected by topographic and humanfactors.SOM,TN and AN were important factors ofIFI,and the increase of TN was the key driving factor for the improvement ofIFI.Rice yield and IFI were significantly positivecorrelated.

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孙耿,孙梅,周峻宇,黄晶,曾跃辉,罗尊长.40年来宁乡市稻田土壤肥力时空变异分析[J].中国土壤与肥料,2020,(6):41-49.

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  • 收稿日期:2019-11-08
  • 最后修改日期:
  • 录用日期:2019-12-20
  • 在线发布日期: 2021-01-21