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学生実習による広葉樹植林地の調査
77
Survey of an afforested area with broad-leaved trees conducted as practical training for
students: the case of an Amur cork forest established in 2017
Teruo ARASE, Dai OTSUKA, Hajime KOBAYASHI, Wataru KINOSHITA,
Yukio NOMIZO and Toshinobu SAKAI
Education and Research Center of Alpine Field Science, Faculty of Agriculture, Shinshu University
Summary
A survey of tree inventory data was conducted in a broad-leaved forest area at Terasawayama
Research Forest as part of practical training for students at the Faculty of Agriculture, Shinshu University.
Specifically, the growth conditions and tree height were recorded in an Amur cork (Phellodendron
amurense) forest established in 2017 (18 rows with a density of 3,000 trees per ha in an area of 0.08 ha), in
June 2019. For growth conditions, five stages (a combination of ʻpresence or absence of leavesʼ, ʻposition of
leavesʼ and ʻpresence or absence of root tensionʼ) were classified. The survey was completed by 33 people in
approximately one hour. Of the 240 Amur cork trees that were counted, 79 (32.9 %) were dead and needed
to be replanted. A comparison of the number of trees and tree height showed a significant difference
between individuals on slopes and in flatland areas; for example, the proportion of the trees taller than >100
cm was high on slopes, while most individuals in the flatland areas were less than 50-cm. The proportion of
dead trees was approximately 30% in each stand. As in most practical training exercises involving students
that need to be transported to the study site, the length of time spent on the actual surveys was somewhat
limited. In addition, students recorded ʻnull dataʼ (i.e., the absence of a tree) using a variety of methods,
which complicated the data analysis.
Key words: Terasawayama Research Forest, Practical training for students, Afforestation using broadleaved trees, Amur cork (Phellodendron amurense), Surveys for collecting tree inventory data
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