Change patterns of leaf area index (LAI) of Pinus tabulaeformis and Platyc ladus orientalis plantations in Beijing

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Change patterns of leaf area index (LAI) of Pinus tabulaeformis and Platyc ladus orientalis plantations in Beijing

WANG Xiqun¹;MA Lüyi¹;ZHANG Yongfu²

¹Key Laboratory for Silviculture and Conservation of Education Ministry,Beijing Forestry University,Beijing 100083, China;
²Beijing Shisanling Fo rest Farm, Beijing 102200, China

Received:2006-02-20 Revised:2006-06-13 Online:2006-12-10 Published:2006-12-10

Abstract

Abstract: Leaf area index (LAI) is an important parameter in plant population structure research, and of significance in the estimation of stand quality. The large scope LAI obtained by optical measurement and remote sensing needs to be validated by actual survey. With Pinus tabulaeformis and Platycladus orientalis plant ations in the State Shisanling Forest Farm of Beijing as test objects, and using the LAI data obtained by Digital Plant Canopy Imager (CI-110) and field survey,this paper analyzed the relationship between effective LAI (LAI_e) and actual LAI (LAI_a).The results showed that the LAI_e/LAI_a ratio ofP. tabulaeformis plantation was 35.52%～36.36%, and that of P. orientalisplantation was 14.60%～16.72%. Because the canopy openness of test plantations ranged from 0.5 to 0.8, which accorded with the requirement of non-commercial forest m anagement, the LAI of P. tabulaeformis and P. orientalis plantations was appropriate to be used as an important gist in their quality control.

Key words: Sulfur fertilization, Crops, Increase production

WANG Xiqun¹;MA Lüyi¹;ZHANG Yongfu². Change patterns of leaf area index (LAI) of Pinus tabulaeformis and Platyc ladus orientalis plantations in Beijing [J]. cje.

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Change patterns of leaf area index (LAI) of Pinus tabulaeformis and Platyc ladus orientalis plantations in Beijing

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