Effects of forest growth in different vegetation communities on forest catchment water balance

Science of the Total Environment Volume 809 Page 151159- published_at 2022-01-12
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Title ( eng )
Effects of forest growth in different vegetation communities on forest catchment water balance
Creator
Saito Mitsuyo
Shimizu Yuta
Iwata Toru
Source Title
Science of the Total Environment
Volume 809
Start Page 151159
Abstract
Forest ecosystems are critical for adjusting the dynamic balance of the hydrological cycle. This balance is affected by vegetation community types, phenology, and forest density. Previous long-term catchment-scale model studies have focused on changes in forest areas while ignoring the above factors. Since the 1980s, climate change caused by increases in atmospheric CO2 levels has enhanced forest growth. Moreover, amendments to forest management policies, including intermediate cuttings caused by economic factors, have yielded unprecedented changes in forest ecosystems. In this study, we designed a methodology and created a credible model using the Soil and Water Assessment Tool (SWAT) that can precisely reflect water balance variations caused by different ecosystem situations during long-term changes in forest density. We focused on the Yamato River catchment in Western Japan, which includes three planted forests and one primeval forest, each markedly different with respect to vegetation community composition and management policy. In the process,we examined the ratio of coniferous vegetation and broad-leaved vegetation in different forest areas, used remote sensing methods to quantify the maximum and minimum leaf area index (LAI) of each forest region over 40 years, and calibrated the model by comparing the LAI growth curve, evapotranspiration, and streamflow with observed data.Moreover, we separated the decadal canopy evaporation, transpiration, and soil evaporation from the SWAT output results. We found that (1) forest evapotranspiration has increased in recent decades because of the above reasons; (2) in young or well-managed forests, the forest water balance may have changed significantly with forest growth. For long-term studies, it is necessary to distinguish the growth characteristics of different forests during different periods, and a detailed definition of a mixed forest is required. The forest parameters and growth characteristics are critical for understanding forest ecosystems and cannot be ignored at catchment-scale.
Keywords
Forest density
SWAT
Remote sensing
Evaporation
Transpiration
Descriptions
This material is based on work supported by the Asia-Pacific Network for Global Change Research (APN) under Grant No. CRRP2019-09MY-Onodera (funder ID: http://dx.doi.org/10.13039/100005536). Research promotion for the environmental creation and rehabilitation of Osaka Bay area by Osaka Bay Regional Offshore Environmental Improvement Center (Project No. 010005, PI: Mitsuyo Saito).

Language
eng
Resource Type journal article
Publisher
Elsevier
Date of Issued 2022-01-12
Rights
© 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
This is not the published version. Please cite only the published version.
この論文は出版社版ではありません。引用の際には出版社版をご確認、ご利用ください。
Publish Type Accepted Manuscript
Access Rights open access
Source Identifier
[DOI] https://doi.org/10.1016/j.scitotenv.2021.151159 isVersionOf
助成機関名
日本学術振興会
Japan Society for the Promotion of Science
助成機関識別子
[Crossref Funder] https://doi.org/10.13039/501100001691
研究課題名
沿岸生態系と農地を相互保全する地域再循環システムに基づく流域型農業環境革新の展開
Innovation of catchment agriculture and environment, based on regional recycle system conserving coastal ecosystem and agricultural land
研究課題番号
18H04151