林带疏透度数字化测度方法的改进及其应用研究

应用生态学报 ›› 2002, Vol. ›› Issue (6): 651-657.

林带疏透度数字化测度方法的改进及其应用研究

关文彬¹, 李春平¹, 李世锋¹, 范志平², 谢春华¹

1. 北京林业大学水土保持与荒漠化防治部级重点实验室, 北京 100083;
2. 中国科学院沈阳应用生态研究所, 沈阳 110016

收稿日期:2002-02-01 修回日期:2002-03-25 出版日期:2002-06-15
通讯作者: 关文彬,男,1965年生,博士,主要从事植物种群生态、植被生态、生物多样性科学及林业生态工程与荒漠化防治领域的研究,发表论文40余篇,参编著作3部.Tel:010-62338689,E-mail:desertwx@bjfu.edu.cn
基金资助:
国家自然科学基金资助项目(39870639)

Improvement and application of digitized measure on shelterbelt porosity

GUAN Wenbin¹, LI Chunping¹, LI Shifeng¹, FAN Zhiping², XIE Chunhua ¹

1. Laboratory of Soil and Water Conservation and Desertification Combating, Beijing Forestry University, Beijing 100083;
2. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016

Received:2002-02-01 Revised:2002-03-25 Online:2002-06-15

摘要/Abstract

摘要： 在大量野外调查基础上,用数码相机拍摄林带相片,采用CIAS软件测定林带疏透度,对已有“数字图像处理法”进行了改进,并对疏透度的变化规律进行了深入研究.结果表明,用改进的数字化方法测定林带的疏透度,比用光学相机所进行的“数字图像处理法”精度高,更经济、简捷;林带疏透度β与相对枝下高x(枝下高/林带平均高)的关系无叶期可表达为β=1.0681x^0.4304(r=0.9763,r_0.01=0.4073);有叶期可表达为β=0.672x^0.469(r=0.9851,r_0.01=0.4073)(0≤β≤1);β随着林龄a呈抛物线式变化,β=0.0009a²-0.0364a+0.6828(0≤β≤1);提出的林带断面疏透度β0是定量反映林带断面结构的定量评价指标,同时可作为评价林带结构的辅助指标;提出混交林带的疏透度计算式β=(β₁n₁+β₂n₂)/(n₁+n₂);在相同配置不同树种的纯杨、柳、榆林带结构以杨树林带结构较好,柳树林带结构次之,疏透度值β_PPP<β_SSS<β_UUU;在树种相同、配置不同时,品字形优于矩形;杨柳榆的混交林带中杨榆株间、杨柳对称式行间SPPS混交方式结构防护效果较好.

Abstract: Based on the lots of investigation on farmland shelterbelts,we used digital camera to take pictures of shelterbelt and apply CIASsoftware to improve "digital image processing" for determining shelterbelt porosity so as to tho-roughly analyze the rule of porosity in farmland shelterbelts. Compared with the old digital image processing,the improved method possesses high accuracy,and it is more economical and more convenient to apply. The relationship between porosity of shelterbelts (β) and relative clear bole height (x) can be expressed as β=0.672x^0.469(r=0.9851,r_0.01= 0.4073,0≤β≤1) in the leaf period; and β=1.0681x^0.4304(r=0.9763,r 001= 0.4073,0≤β≤1) in the defoliation period. β varies with the stand age (a),taking the form of parabola,which can be expressed as β=0.0009a²-0.0364a+0.6828(0≤β≤1). Porosity at cross-section of shelterbelt can be used as an auxiliary index to evaluate the structure of belts. The calculation method of shelterbelt porosity of mixed shelterbelt can be expressed as β=(β₁n₁+β₂n₂)/(n₁+n₂). Among the popular,willow and elm pure shelterbelts with same disposition,popular shelterbelt structure is the best,with β_PPP<β_SSS<β_UUU,while the triangle disposition is better than the rectangle one among the same tree species. UPPU and SPPSof mixed structure have the optimal effect in popular-willow-elm mixed shelterbelts.

中图分类号:

关文彬, 李春平, 李世锋, 范志平, 谢春华. 林带疏透度数字化测度方法的改进及其应用研究[J]. 应用生态学报, 2002, (6): 651-657.

GUAN Wenbin, LI Chunping, LI Shifeng, FAN Zhiping, XIE Chunhua . Improvement and application of digitized measure on shelterbelt porosity[J]. Chinese Journal of Applied Ecology, 2002, (6): 651-657.

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