| Item type |
国際農研デフォルトアイテムタイプ（フル）(1) |
| 公開日 |
2024-06-18 |
| タイトル |
|
|
タイトル |
Effects of First Thinning on Growth and Stem Form of Teak Plantations in Thailand |
|
言語 |
en |
| 作成者 |
Vacharangkura, Tosporn
Himmapan, Woraphun
Noda, Iwao
Yoneda, Reiji
|
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 主題 |
|
|
主題 |
Thinning intensity, Mean volume increment, Stand volume increment, Live-crown ratio, Slenderness ratio, Absolut form factor |
| 内容記述 |
|
|
内容記述タイプ |
Other |
|
内容記述 |
The effects of first thinning on growth and stem form of teak stands were examined in Uttaradit Province, Northern Thailand. In this study, a randomized complete block design with 3 replications was used, and thinning from below (low thinning) was applied as the first thinning. The thinning treatments were as follows: removal of basal area at the levels of 0% (unthinned), 30% (moderate), and 50% (heavy). The measurement period after thinning was 4 years. The results of the study revealed that heavy thinning provided the largest mean basal area and mean stem volume of individual trees in the stands compared with the other treatments. The total stand volume increase in production per rai (0.16 ha) was largest in moderate thinning plots and differed significantly from unthinned plots, but did not differ significantly from heavy thinning plots. The moderate and heavy thinning intensities reduced the annual stand volume increase by 23% and 64%, respectively, related to the mean stand volume increase of thinned stands before thinning was executed, whereas those in unthinned plots reduced by almost 99%.
Part of the total stand volume production of unthinned plots was lost through natural mortality. In the thinned plots, naturalmortality was considerably lower compared with the unthinned plots. The mean diameter at breast height (DBH) increment of all trees as well as the mean DBH increment of the dominant trees was enhanced with increasing thinning intensity, but there was no significant difference among the thinned and unthinned plots. However, the mean DBH increment of all trees in unthinned plots was as much as those in moderate thinning plots. In contrast, total height increment of all trees and the dominant trees were not affected by thinning intensity. Live-crown ratio, slenderness ratio, and absolute form factor of the trees in the stand were affected by different thinning intensities. Live-crown ratio increased with greater thinning intensity. On the other hand, slenderness ratio decreased with greater thinning intensity. The absolute form factor was smallest in unthinned plots, and different thinning intensities had clear effects on the absolute form factor. Thus, thinning intensity resulted in improved growth and yield of stands after thinning as well as individual tree size and tended to have positive effects on stem form. |
|
言語 |
en |
| 出版者 |
|
|
出版者 |
Japan International Research Center for Agricultural Sciences |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_3248 |
|
資源タイプ |
book part |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| ID登録 |
|
|
ID登録 |
10.34556/0002000297 |
|
ID登録タイプ |
JaLC |
| 関連情報 |
|
|
関連タイプ |
isPartOf |
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.34556/0002000291 |
|
|
関連名称 |
Improvement of Utilization Techniques of Forest Resources to Promote Sustainable Forestry in Thailand |
| 収録物識別子 |
|
|
収録物識別子タイプ |
PISSN |
|
収録物識別子 |
1341-710X |
| 収録物識別子 |
|
|
収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA11159468 |
| 書誌情報 |
en : JIRCAS Working Report : Improvement of Utilization Techniques of Forest Resources to Promote Sustainable Forestry in Thailand
巻 85,
p. 19-30,
発行日 2017-03-17
|
| 位置情報 |
|
|
|
位置情報（自由記述） |
Thailand |
|
|
位置情報（自由記述） |
タイ |
| 助成情報 |
|
|
|
識別子タイプ |
Crossref Funder |
|
|
助成機関識別子 |
https://doi.org/10.13039/501100009472 |
|
|
助成機関名 |
Japan International Research Center for Agricultural Sciences(en) |
|
|
研究課題名 |
Development of combined management techniques for agriculture and forestry to support farmers engaged in planting beneficial indigenous tree species.(en) |
| 助成情報 |
|
|
|
識別子タイプ |
Crossref Funder |
|
|
助成機関識別子 |
https://doi.org/10.13039/501100022245 |
|
|
助成機関名 |
Royal Forest Department (RFD) [Thailand](en) |
|
|
研究課題名 |
Development of combined management techniques for agriculture and forestry to support farmers engaged in planting beneficial indigenous tree species.(en) |
jircas_working_report85-_19-30 (800KB)
