中国农业气象 ›› 2014, Vol. 35 ›› Issue (03): 276-280.doi: 103969/jissn1000-6362201403006

• 论文 • 上一篇    下一篇

西藏一江两河地区青稞生产土壤养分限制因子分析

刘国一,尼玛扎西,宋国英,陈立勇   

  1. 1西藏农牧科学院农业资源与环境研究所,拉萨850012;2西藏农牧科学院农业质量标准与检测研究所,拉萨850012
  • 收稿日期:2013-12-11 出版日期:2014-06-20 发布日期:2015-02-11
  • 作者简介:刘国一(1979-),仡佬族,贵州瓮安人,硕士,助理研究员,主要从事土壤肥力、植物营养、农业资源利用等研究。Email:guoyiliu@qq.com
  • 基金资助:

    西藏自治区科技厅重点项目“西藏主要农田土壤养分变化趋势研究”

Analysis of Soil Nutrients Limiting Factors for Barley Production in Centre Tibet

LIU Guo yi, Nimazhaxi SONG Guo ying, CHENG Li yong   

  1. 1Institute of Resources and Environment in Agriculture ,Tibet Academy of Agricultural and Animal Husbandry Sciences,Lhasa 850012,China;2Institute of Quality Standards and Testing Technology for Agro products,TAAAS, Lhasa 850012
  • Received:2013-12-11 Online:2014-06-20 Published:2015-02-11

摘要: 于青稞成熟期(2012年7-8月)选取西藏一江两河地区青稞主产地8个县,每县选择21个青稞连片种植区,对耕层(0-20cm)土壤进行取样,在实验室测定土壤氮、磷、钾等速效养分含量,同时在相应地块采集1m2样方上的青稞成熟植株,称取青稞籽粒重量,并对青稞产量与速效氮、磷、钾养分的相关性进行分析。结果表明:青稞产量与土壤碱解氮含量呈极显著正相关关系(P<0.01),与速效钾含量的正相关关系显著(P<0.05),与速效磷含量的相关性不显著,说明西藏一江两河地区青稞产量对碱解氮的依赖性大,氮素是青稞生长的限制因子。今后可通过调整施肥结构,合理增施氮肥弥补西藏一江两河流域青稞主产地土壤氮素不足从而增加青稞产量。

关键词: 青稞, 产量, 碱解氮, 速效磷, 速效钾, 相关性分析

Abstract: In order to explore the relationship between barley yield and soil available nutrients N, P, K and obtain better Soil nutrient management, samples of soil in the plow layer (0-20cm) and barley during mature period (July and August) were collected from 8 counties in central Tibet(also named YijiangLianghe region) The content of available N, P, K and grain yields in the samples of soils and barley plants were analyzed The relationship between barley yield and soil available N, P, K was calculated The results showed that there was a significant positive correlation between barley yield and soil hydrolyzable N (P<0.01), and positive correlation between barley yield and available K (P<0.05) The results indicated that barley yield in central Tibet was depended mainly on hydrolyzable nitrogen in soil As a result, nitrogen was a significant limiting factor for the barley growth Adjusting the components of fertilizer and increasing nitrogen fertilizer could improve effectively soil nitrogen and barley yield The research results could provide references for soil nutrition management and barley yield improvement in central Tibet

Key words: Barley, Yield, Hydrolyzable N, Available P, Available K, Correlation analysis