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中国农学通报

中国农学通报 ›› 2010, Vol. 26 ›› Issue (7): 84-88.

所属专题： 玉米

• 农学 农业基础科学 • 上一篇    下一篇

两种植物冠层分析仪测量夏玉米LAI结果比较分析

李宗南1,2,陈仲新1,王利民1,任建强1   

  • 收稿日期:2009-12-07 修回日期:2009-12-21 出版日期:2010-04-05 发布日期:2010-04-05
  • 基金资助:

    国家粮食主产区粮食作物种植面积遥感测量与估产业务系统;基于多源遥感数据组网与同化模型的区域作物生长监测与模拟技术研究;引进欧盟及美国区域农情遥感监测系统及其关键技术

Evaluation on the Measurement Errors of Summer Maize LAI by Two Different Plant Canopy Analyzers

  • Received:2009-12-07 Revised:2009-12-21 Online:2010-04-05 Published:2010-04-05

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摘要：

植物冠层分析仪测量作物叶面积指数存在高估或低估现象，不同仪器的测量结果均与真实值存在差异，这种差异除了与仪器有关，还在不同的作物物候期表现出不同规律。本研究使用LAI-2000、Sunscan两种主流植物冠层分析仪测量夏玉米不同生育期LAI，并与LI-3000C叶面积仪实测结果比较。研究发现：当玉米LAI<1时，LAI-2000测量结果高于实际值，Sunscan测量结果与实际值无显著差异；12时，两种冠层分析仪测量结果均低于实际叶面积指数；不同LAI范围内，LAI-2000、Sunscan测量值与实际值的相关系数不同，最高可达0.9778和0.9637，通过建立测量值和实际值的经验关系模型，对仪器测量值进行校正可减少误差。

关键词: 生态恢复, 生态恢复, 废弃采石场, 立地类型, 植物群落, 植物多样性, 肖家山

Abstract:

The measurement of the leaf area index (LAI) by plant canopy analyzer can either overestimate or underestimate the actual LAI of plant canopy. The difference between the measurement and actual LAI can differ between different instruments. The objective of this study is to analyze the errors by 2 type widely-used plant canopy analyzers' measurement of summer maize LAI. In this study, we compared the measurements of LAI by LAI-2000 and Sunscan with the measurements by LI-3000C leaf area meter in 4 different phenological stages of summer maize. The main findings of this research are :(1) when the actual LAI<1,those estimates by LAI-2000 are higher than the actual value, but those estimates by Sunscan have no statistical difference with the actual value; (2) when the actual LAI ranges from 1 to 2,those estimates by LAI-2000 have no difference with the actual values, but the estimates by Sunscan are lower than the true value; (3) when the actual LAI>2,those estimates by both of the two instruments underestimate the actual value. (3) The correlation coefficients of LAI-2000, Sunscan estimates and those actual values are different in different crop phenological stages, with the maxima of 0.9778 and 0.9637 respectively. Then it is possible to establish the empirical models to calibrate the estimates from different plant canopy analyzers to improve accuracy.