DOI: 10.5194/hess-23-155-2019
论文题名: Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment
作者: Imaizumi F. ; Nishii R. ; Ueno K. ; Kurobe K.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 1 起始页码: 155
结束页码: 170
语种: 英语
Scopus关键词: Creep
; Erosion
; Freezing
; Harvesting
; Process control
; Rain
; Sediment transport
; Sedimentation
; Snow
; Soils
; Thawing
; Vegetation
; Artificial forest
; Forest harvesting
; Freeze-thaw process
; Ground surface temperature
; Ground temperature
; Microclimate conditions
; Transport activity
; Transport process
; Forestry
; climate conditions
; erosion
; forest canopy
; harvesting
; hillslope
; humid environment
; microclimate
; periglacial environment
; rainfall
; sediment transport
; snow cover
; temperature
; vegetation cover
; Honshu
; Japan
; Japanese Alps
; Euonymus fortunei
英文摘要: Sediment transport activities in periglacial environments are controlled by microclimate conditions (i.e., air and ground temperatures, throughfall), which are highly affected by vegetation cover. Thus, there is the possibility that forest harvesting, the most dramatic change to vegetation cover in mountain areas, may severely impact sediment transport activities in periglacial areas (i.e., soil creep, dry ravel). In this study, we investigated changes in sediment transport activities following forest harvesting in steep artificial forests located in a humid periglacial area of the southern Japanese Alps. In the southern Japanese Alps, rainfall is abundant in summer and autumn, and winter air temperatures frequently rise above and fall below 0°. Our monitoring by time lapse cameras revealed that gravitational transport processes (e.g., frost creep and dry ravel) dominate during the freeze-thaw season, while rainfall-induced processes (surface erosion and soil creep) occur during heavy rainfall seasons. Canopy removal by forest harvesting increased the winter diurnal ground surface temperature range from 2.7 to 15.9 °C. Forest harvesting also increased the diurnal range of net radiation and ground temperature, and decreased the duration of snow cover. Such changes in the microclimate conditions altered the type of winter soil creep from frost creep to diurnal needle-ice creep. Winter creep velocity of ground surface sediment in the harvested site (> 2mmday -1 on the days with frost heave) was significantly higher than that in the non-harvested site (generally < 1mmday -1 /. Meanwhile, sediment flux on the hillslopes, as observed by sediment traps, decreased in the harvested site. Branches of harvested trees left on the hillslopes captured sediment moving downslope. In addition, the growth of understories after harvesting possibly reduced surface erosion. Consequently, removal of the forest canopy by forest harvesting directly impacts the microclimate conditions (i.e., diurnal range of ground temperature and net radiation, duration of snow cover) and increases frequency and velocity of periglacial soil creep, while sediment flux on hillslopes is decreased by branches left on the hillslopes and recovery of understories. The impact of forest harvesting on sediment transport activity is seasonally variable in humid periglacial areas, because microclimate conditions relevant to both freeze- thaw processes and precipitation-induced processes control sediment transport. © 2019 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163080
Appears in Collections: 气候变化与战略
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作者单位: Imaizumi, F., Faculty of Agriculture, Shizuoka University, Shizuoka, 422-8529, Japan; Nishii, R., Center for Transdisciplinary Research, Niigata University, Niigata, 950-2181, Japan; Ueno, K., Faculty of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan; Kurobe, K., Pacific Consultants Co., Ltd, Tokyo, 101-8462, Japan
Recommended Citation:
Imaizumi F.,Nishii R.,Ueno K.,et al. Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment[J]. Hydrology and Earth System Sciences,2019-01-01,23(1)