img

官方微信

高级检索

中国沙漠 ›› 2000, Vol. 20 ›› Issue (s1): 66-69.

• 论文 • 上一篇    下一篇

奈曼沙地春小麦蒸散量及其分析

李玉霖, 崔建垣, 张铜会   

  1. 中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000
  • 收稿日期:2000-01-15 修回日期:2000-03-20 出版日期:2000-12-31 发布日期:2000-12-31
  • 作者简介:李玉霖(1970-),男(汉族),甘肃靖远县人,硕士,助理研究员,主要从事农田微气象研究。
  • 基金资助:
    国家"973"项目(G1999043400);国家"九五"攻关项目(96-920-13-02);院特别支持项目(KZ95T-04;KZ951-A1-301);院重点项目(KZ-952-91-218);国家重大基金课题(49890330);内蒙科委课题"西部之光"(999078);自然科学基金(990141)

Evapotranspiration and its Analysis for Spring Wheat in Sandy Cropland in Naiman

LI Yu-lin, CUI Jian-yuan, ZHANG Tong-hui   

  1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2000-01-15 Revised:2000-03-20 Online:2000-12-31 Published:2000-12-31

摘要: 运用波文比-能量平衡法和大型蒸渗仪对沙地春小麦的蒸散量进行了连续的测定和估算,并对由于降雨和灌溉所引起的土壤有效水分变化与沙地春小麦蒸散量之间的相关关系进行了初步探讨。结果表明:①春小麦蒸散量在降水或灌溉后1~2 d最大,然后逐渐下降,说明春小麦的蒸散速度受土壤有效水分含量的影响;②春小麦出苗前和生长初期,蒸散以地表蒸发为主,蒸散量较小,感热通量和土壤热通量较大;随着时间推移,L AI(叶面积系数)逐渐增大,由于作物遮蔽,感热通量和土壤热通量减小,潜热通量对净辐射贡献增大;③测定期间,波文比在早晨日出前(5:00)达到最大,至下午15:00左右下降为最小,然后开始增大至次日凌晨;④应用波文比-能量平衡法估测的沙地春小麦蒸散量与大型蒸渗仪的测定值一致性较好,相关系数R2为0.9055。

关键词: 春小麦, 波文比-能量平衡法, 蒸渗仪, 蒸散量

Abstract: In this paper,the evapotranspiration of spring wheat in Horqin sandy cropland was estimated and measured continuously by Bowen ratio energy balance approach and Lysimeter,and the relationship between the changes of the soil water content caused by irrigation and rainfall and evapotranspiration of spring wheat was analyzed.The results are as follows:①The evapotranspiration of spring wheat will reach the largest 1~2 days after rainfall or irrigation,then decreases gradually.That means the speed of evapotranspiration in spring wheat is affected by the soil water content.②During the early stage of wheat growth,the proportions of land surface evaporation to evapotranspiration of spring wheat are large and the sensible heat flux and soil heat flux are large,too;with the time,the sensible heat flux and soil heat flux decrease and the share of latent heat flux in the net radiation increases because the leaf area index(LAI) rises;③Bowen ratio gets to the largest at sunrise(5:00) in the morning and decreases to the smallest at 15:00 o'clock and increases again till next morning;④The difference of the evapotranspiration measured by the two approaches is negligible and the correlated coefficient(R2) is 0.9055.

Key words: spring wheat, Bowen ratio-energy balance, Lysimeter, evapotranspiration

中图分类号: