Changes in the sapwood area of Japanese cedar and cypress plantations after thinning

Published Date
February 2015, Volume 20, Issue 1, pp 43–51

Original Article

First Online: 

10 October 2014

DOI: 10.1007/s10310-014-0468-8

Cite this article as: 

Komatsu, H. & Kume, T. J For Res (2015) 20: 43. doi:10.1007/s10310-

Author

• Hikaru KomatsuEmail author
• Tomonori Kume

Abstract

Previous studies have revealed that the sapwood area at stand scale (A) is an important factor determining changes in transpiration by canopy trees (E). This study examined changes in A for four to six years after thinning of two Japanese cedar and two cypress plantation sites, each having three or four plots with different thinning intensities and one control plot. We focused on whether there was a difference in A (δA) between a thinned plot and a control plot during the experimental period. We observed increased radial stem growth for plots with low stem density (N) due to intensive thinning. However, δA did not decrease to zero during the experimental period for any plot. The increased radial stem growth was not large enough to cancel the effect of low N due to thinning. These results imply that a lower E for thinned plantations as compared to non-thinned plantationsis remains for several years (more than 10 years, according to our results) after thinning and that thinning could be an effective method of reducing water consumption by canopy trees.

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Estimating sound seedfall density of Fagus crenata using a visual survey

Published Date
February 2015, Volume 20, Issue 1, pp 94–103

Original Article

First Online: 

26 March 2014

DOI: 10.1007/s10310-014-0440-7

Cite this article as: 

Nakajima, H. J For Res (2015) 20: 94. doi:10.1007/s10310-014-0440-7

Author

• Haruki NakajimaEmail author

Abstract

Estimating forest tree seeding before seedfall is important because annual fluctuations in seeding affect forest regeneration and wildlife behavior. Visual surveys for estimating tree seeding can be conducted easily, but cannot distinguish sound and unsound seeds, and cannot directly measure sound seedfall density, which closely correlates to seedling density and the food availability for wildlife. To establish an effective model for estimating sound seedfall density of Fagus crenata from a visual survey, seeding intensity at the tree level was visually rated into five classes in four stands for 7 years. Seedfall density of the visually surveyed trees was also measured by seed traps. Seeding intensity was strongly correlated with sound seedfall density at the tree level, and sound seedfall density differed among the five classes. However, a model that used only seeding intensity as an explanatory variable was not as effective at estimating sound seedfall density as more complex models that used the stand-level seeding index, calculated from the composition ratio of seeding intensity, in the current and previous years. More complex models improved the estimates because the proportion of sound-to-total seeds at the tree level depended on stand-level total seed production resulting from pollination efficiency and insect predator satiation. This method should be useful for forest management and wildlife conservation because it is rapid, easy, and highly accurate.

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