Partitioning of the total evapotranspiration in a Japanese cypress plantation during the growing season

Sun, Xinchao; Onda, Yuichi; Kato, Hiroaki; Otsuki, Kyoichi; Gomi, Takashi

doi:10.1002/eco.1428

Cited by 28 publications

(30 citation statements)

References 43 publications

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“…In addition, our E c estimates may not be accurate for cases in which forest management is conducted in an untraditional way. For example, several scholars (e.g., Nanko, Onda, Kato, & Gomi, ; Sun, Onda, Kato, Otsuki, & Gomi, ; Sun, Onda, Otsuki, et al, ) recently propose intensive thinning of forests (~50% of the stem density) to secure water resources. To reasonably estimate E c for these cases, it is necessary to create yield tables for intensively thinned cypress forests and to confirm validity of assuming constant u ref among stands.…”

Section: Discussionmentioning

confidence: 99%

Relationship between stem diameter and transpiration for Japanese cypress trees: Implications for estimating canopy transpiration

et al. 2019

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Previous studies reported relationships between stem diameter at breast height (DBH) and whole‐tree transpiration (Qt) across a variety of species and locations. It might be possible to develop a relationship between DBH and Qt with smaller variations when we focused on a single species. We attempted to develop such a relationship for Japanese cypress (Chamaecyparis obtusa), which is one of the major plantation species in Japan. We collated Qt for 51 Japanese cypress trees from nine different‐sized and different‐aged stands using the sap flux method. We found a strong linear correlation between DBH and the reference value of Qt at a vapour pressure deficit of 1 kPa (R = .883). This was a consequence of a strong correlation between DBH and sapwood area (AS_tree; R = .973) and the absence of a correlation between DBH and sap flux density (R = −.043). We confirmed that using the relationship between DBH and AS_tree, while assuming typical responses of sap flux density to meteorological factors, provides reasonable Qt estimates. This study also demonstrated how the DBH–Qt relationship can be applied to estimate changes in EC with changing forest management.

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Section: Discussionmentioning

confidence: 99%

Relationship between stem diameter and transpiration for Japanese cypress trees: Implications for estimating canopy transpiration

et al. 2019

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“…Monthly Δ S (mm) in 0–180 cm profile was calculated according to initial and final SWC of each growing season (Wang et al ., ). ET and its components can be expressed as

E T = E_{i} + E_{c} + E_{s}

where E i is canopy interception, E c is canopy transpiration and E s is soil evaporation (Sun et al ., ).…”

Section: Methodsmentioning

confidence: 99%

Biophysical controls on canopy transpiration in a black locust (Robinia pseudoacacia) plantation on the semi‐arid Loess Plateau, China

et al. 2015

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In the semi-arid Loess Plateau of China, black locust (Robinia pseudoacacia) was widely planted for soil conservation and afforestation purposes during the past three decades. Investigating biophysical controls on canopy transpiration (E c ) of the plantations is essential to understanding the effects of afforestation on watershed hydrology and regional water resources. In addition to monitoring of micrometeorology and soil water content, sap flux densities (F d ) of six representative trees in a 27-year stand were continuously measured using thermal dissipation probes during the growing seasons in 2013 and 2014. E c was derived by multiplying stand total sapwood area (A ST ) with F d . The daily mean E c in the growing season was 0.14 and 0.23 mm day À1 in 2013 and 2014, respectively. The responses of daily E c to R s and vapour pressure deficit were explained with an exponential threshold model. The variability of monthly E c was mainly explained by leaf area index (LAI) (R 2 = 0.92). The inter-annual variability of E c was influenced by LAI that fluctuated dramatically during 2013 and 2014. We found that the status of soil water content at the beginning of the growing season had large impacts on LAI and E c during the growing season. Contrary to common beliefs that the plantation uses a large amount of water, we found that the black locust plantation had rather low transpiration rates (5.3% of precipitation and 4.6% of ET 0 ). This study suggests that the black locust plantation has adapted to local soil water condition by reducing transpiration, and the major water loss from the plantation was not transpiration.

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“…In addition, tree transpiration was reported to be associated with soil-water content at a depth of 10~20 cm in a semi-arid pine forest [39]. Sun et al [40] found that in a humid forest, transpiration was related to soil moisture at a depth of 5~15 cm and soil evaporation was generally related to soil moisture in the topsoil (5 cm depth). The seasonal pattern of soil-water content at our site was similar to these previous studies.…”

Section: Meteorological and Soil-water Conditionsmentioning

confidence: 99%

Responses of Sap Flow of Deciduous and Conifer Trees to Soil Drying in a Subalpine Forest

Yan

Wang

Zhang

et al. 2018

Forests

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Co-occurring species may adopt different water-use strategies to adapt to limited soil water. In Jiuzhaigou Valley, a continuous decline in soil water after an initial recharge from the thawing of snow and frozen soil in early spring was observed, but its effects on the sap flow dynamics of co-occurring species are not well understood. To clarify the species-specific water-use strategy, variations in sap flow and environmental conditions were investigated for two co-occurring species (Betula albosinensis Burk. and Pinus tabuliaeformis Carr.) in a mixed forest during a transition from the wet to dry period in 2014. Sap flow was measured using Granier-type thermal dissipation probes, and the soil-water content was measured using time-domain reflectometry probes for a successive period. Our study showed that B. albosinensis maintained relatively high transpiration until late into the season regardless of soil moisture, while the transpiration of P. tabuliformis showed a continuous decrease in response to seasonal soil drying. Sap flow for both species exhibited a marked hysteresis in response to meteorological factors and it was conditioned by the soil-water status, especially in the afternoon. We found that P. tabuliformis was sensitive to soil-water conditions, while for B. albosinensis, the sap flow was not very sensitive to changes in soil-water conditions. These results indicate that B. albosinensis could manage the water consumption conservatively under both dry and wet conditions. These results may have implications for evaluating the species-specific water-use strategy and carrying out proper reforestation practices.

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Partitioning of the total evapotranspiration in a Japanese cypress plantation during the growing season

Cited by 28 publications

References 43 publications

Relationship between stem diameter and transpiration for Japanese cypress trees: Implications for estimating canopy transpiration

Relationship between stem diameter and transpiration for Japanese cypress trees: Implications for estimating canopy transpiration

Biophysical controls on canopy transpiration in a black locust (Robinia pseudoacacia) plantation on the semi‐arid Loess Plateau, China

Responses of Sap Flow of Deciduous and Conifer Trees to Soil Drying in a Subalpine Forest

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