Changes in canopy transpiration due to thinning of a Cryptomeria japonica plantation

Komatsu, Hirokazu; Shinohara, Yoshinori; Nogata, Mari; Tsuruta, Kenji; Otsuki, Kyoichi

doi:10.3178/hrl.7.60

Cited by 26 publications

(21 citation statements)

References 24 publications

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“…Kumagai et al . () indicated there is no water movement in the transition wood, and its width might be assumed constant at about 10 mm (Kumagai et al ., ; Komatsu et al ., ). We thus subtracted 10 mm from the sapwood depth to define the depth of the hydro‐active area in Cr.…”

Section: Methodsmentioning

confidence: 97%

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Changes in canopy transpiration of Japanese cypress and Japanese cedar plantations because of selective thinning

Tateishi

Xiang

Saito

et al. 2015

Hydrological Processes

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Abstract:Canopy transpiration (E stand ) is a main component of forest water cycle, and forest management including thinning affects canopy transpiration E stand , yet few studies have examined the changes in E stand . In this study, we investigated the changes in E stand after the thinning of Chamaecyparis obtusa and Cryptomeria japonica stands by 50% of their stems. The E stand was estimated using sap flow measurements by Granier-type thermal dissipation probes. The mean stand sap flow density (J S ) after thinning was as high as that before thinning in both plots. Under the same conditions of microclimate, E stand after thinning decreased by 44.0 and 21.2% for the Ch. obtusa plot and the Cr. japonica plot, respectively. The thinning reduced the sapwood area by 44.5% in the Ch. obtusa plot and 34.2% in the Cr. japonica plot. The decreases in E stand were similar to the decline in sapwood area, which indicates that the primary cause of the changes in E stand was the reduction of sapwood area. The reference canopy conductance (G cref ) after thinning was 52.7% and 75.3% lower for Ch. obtusa and Cr. japonica, respectively, whereas stomatal sensitivity to the vapour pressure deficit was similar in both periods. Thus, the changes in canopy conductance after thinning were associated with changes in G cref , resulting in a decrease of E stand .

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Section: Methodsmentioning

confidence: 97%

“…Komatsu et al . () reported a 44% decline in E stand for Cr. japonica after 50% intensive thinning, and both studies concluded that the decline resulted from changes in the total sapwood area ( A s ).…”

Section: Introductionmentioning

confidence: 95%

Changes in canopy transpiration of Japanese cypress and Japanese cedar plantations because of selective thinning

Tateishi

Xiang

Saito

et al. 2015

Hydrological Processes

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“…Thus, the responses of the spatial TF patterns to different forestry practices differ. In Japan, the mature Japanese coniferous plantations suffer from a lack of management and should be thinned (Onda et al , ; Komatsu et al ., ). However, until now, data regarding the changes in spatial TF patterns under different forestry practices have been limited.…”

Section: Discussionmentioning

confidence: 97%

The effect of strip thinning on spatial and temporal variability of throughfall in a Japanese cypress plantation

Sun

Onda

Chiara

et al. 2015

Hydrological Processes

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We examined the effect of strip thinning on the spatio-temporal variability of throughfall (TF) in a mature Japanese cypress (Chamaecyparis obtusa) stand. Strip thinning, which removed 50% of stems, was performed in a catchment in October 2011. TF was examined by setting up 20 tipping-bucket rain gauges in an experimental plot. Canopy interception parameters were derived from high-temporal-resolution TF data. Observations were obtained during the growing season in the pre-thinning and postthinning periods. The results demonstrated that after thinning, the TF rate increased from 64.3 to 76.2%, and the mean coefficient of variation of the TF rate significantly decreased from 27.3 ± 9.7 to 22.5 ± 6.8%. The spatial TF patterns were largely related to the rainfall class. There was no significant difference in the TF rate for the rainfall amount >25 mm between the periods. The temporal persistence of the normalized TF was slightly stable in the post-thinning period and was not significantly related to canopy cover or the distance to the nearest trunk of each rain gauge in either period. Additionally, thinning resulted in an increase in the proportion of direct TF (from 0.14 ± 0.07 to 0.33 ± 0.11) and a decrease in canopy water storage (from 2.4 ± 0.7 to 1.5 ± 0.5 mm). The quantification of the canopy interception parameters can aid in modelling the changes in interception loss and its processes induced by thinning. These findings also help recognize the changes in spatial TF patterns under different forest management practices.

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“…The frequency distribution of DBH for the 57 trees was almost the same (Kolmogorov-Smirnov test; P = 0.588) as that for all 146 trees before thinning (Supplement Figure S1). Komatsu et al (2013) provided details of stand structure before and after thinning.…”

Section: Study Sitementioning

confidence: 99%

“…On the basis of the sap flow technique, stand-scale transpiration (E) has often been calculated as the sum of individual tree-scale transpiration (Q) divided by the ground area Komatsu et al, 2013). Q is obtained from products of total sapwood area (A S ) and the mean sap flux density (F d ) of sapwood.…”

Section: Introductionmentioning

confidence: 99%

Sapwood and intermediate wood thickness variation in Japanese cedar: impacts on sapwood area estimates

Shinohara

Komatsu

Otsuki

2015

Hydrological Research Letters

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Abstract:Variation in sapwood thickness (T S ) around the circumference of a stem and the presence of intermediate wood can cause errors in the estimation of sapwood area (A S ) and individual tree-scale transpiration (Q) based on the sap flow technique. We measured bark thickness (T B ), T S , and intermediate wood thickness (T I ) in 16 orthogonal directions for wood discs from 57 Japanese cedar (Cryptomeria japonica) trees, and evaluated the impact of variation in T S around the circumference of a stem and the validity of assuming a constant T I for A S estimates. The coefficient of variation of T S in the 16 directions was 5.3-36.7%. A S based on four orthogonal directions resulted in only minor errors for all trees, although this was not the case for A S based on one and two directions. The mean T I over the 16 directions was not significantly correlated to the diameter. If T I was assumed to be constant at the median value for our forest (=0.8 cm), the relative absolute errors for six of the 57 trees exceeded 30%. If these errors are unacceptable, we recommend extracting stem discs to measure T I when estimating A S and Q for trees with intermediate wood having a similar color to sapwood.

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Changes in canopy transpiration due to thinning of a Cryptomeria japonica plantation

Cited by 26 publications

References 24 publications

Changes in canopy transpiration of Japanese cypress and Japanese cedar plantations because of selective thinning

Changes in canopy transpiration of Japanese cypress and Japanese cedar plantations because of selective thinning

The effect of strip thinning on spatial and temporal variability of throughfall in a Japanese cypress plantation

Sapwood and intermediate wood thickness variation in Japanese cedar: impacts on sapwood area estimates

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