Development and application of citrus LAI using infrared transmittance technique

被引：0
作者：
机构：
[1] Key Laboratory of Key Technology for South Agricultural Machine and Equipment, Ministry of Education, South China Agricultural University
[2] Mechanical Laboratory of China Agriculture Research System
[3] College of Engineering, South China Agricultural University
来源：
Hong, T. (tshong@scau.edu.cn) | 1600年 / Chinese Society of Agricultural Engineering卷 / 28期
关键词：
Automatic testing; Citrus; Infrared transmission; Leaf area index; Models; Overlapped leaves with distant gap;
D O I：
10.3969/j.issn.1002-6819.2012.18.023
中图分类号：
学科分类号：
摘要：
To solve the shortcomings of indirect LAI measurement methods which seldom considered the factors of single isolated canopy, leaves overlapping each other and the image processing speed slowly, the intermittent model avoiding leaves overlapping was established based on the main influential factor of single isolated citrus fruiter LAI'S measuring system (α<0.05) by orthogonal experiment . Then automatic acquisition possible was realized by adopting three dimensional walking mechanisms, and an automatic measuring system of citrus LAI was developed based on infrared transmission using the LabVIEW platform. The hardware system was composed of control module, running gear, signal conditioning model, data acquisition card and PC, of which the demarcated average absolute relative error was 11.11%. With the running gear scan, locate and collect automatically in S shape, 45 citrus trees in the citrus garden of the College of Engineering of South China Agricultural University were tested. With the LAI value computed from direct method and sampling method as true values, the average absolute relative error was 31.4%. Compared with true values, average absolute relative error of the measured value from plant canopy analysis's professional version was 29.8%. Since the errors of the two systems were similar, the system proposed could meet the requirement of LAI test.
引用
收藏
页码：155 / 162
页数：7
相关论文
共 31 条
  • [1] Jonckheere I., Fleck S., Nackaerts K., Et al., Review of methods for in situ leaf area index determination Part I. Theories, sensors and hemisphere photography, Agricultural and Forest Meteorology, 121, 1-2, pp. 19-35, (2004)
  • [2] Hyer E.J., Goetz S.J., Comparison and sensitivity analysis of instruments and radiometric methods for LAI estimation: Assessments from a boreal forest site, Agricultural and Forest Meteorology, 122, 3-4, pp. 157-174, (2004)
  • [3] Wu W., Hong T., Wang X., Et al., Advance in ground-based LAI measurement methods, Journal of Huazhong Agricultural University, 26, 2, pp. 270-275, (2007)
  • [4] Cheng W., Pan K., Yang C., Et al., Research progress in the determination Methods of leaf area index (LAI), Journal of Sichuan Forestry Science and Technology, 31, 3, pp. 51-55, (2010)
  • [5] Wang Q., Chen J., Sun Z., Et al., The utility of LAI-2000 canopy analyzer studying the sunlight distribution characteristics in different plant colonies, Scientia Agricultura Sinica, 39, 5, pp. 922-927, (2006)
  • [6] Kucharik C.J., Norman J.M., Gower S.T., Measurements of branch area and adjusting leaf area index indirect asurements, Agricultural and Forest Meteorology, 11, 9, pp. 9-88, (1998)
  • [7] Liu X., Fan W., Tian Q., Et al., Comparative analysis among different methods of leaf area index inversion, Acta Scientiarum Naturalium Universitatis Pekinensis, 44, 5, pp. 827-834, (2008)
  • [8] Ma X., Zhang J., Xi L., Et al., Variable nitrogen fertilization model of wheat based on LAI, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 37, 10, pp. 122-127, (2010)
  • [9] Wu W., Hong T., Li Z., Et al., Precision manmade fruiter model based on LAI test, Transactions of The Chinese Society of Agricultural Engineering, 25, SUPPL.2, pp. 118-122, (2009)
  • [10] Wu W., Hong T., Yue X., Et al., Random distribution model for quick test of fruiter leaf area index, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 26, 10, pp. 183-187, (2010)
1234