气候变化领域集成服务门户(CCPortal): Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment

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DOI	10.5194/hess-23-155-2019
	Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment
	Imaizumi F.; Nishii R.; Ueno K.; Kurobe K.
发表日期	2019
ISSN	1027-5606
起始页码	155
结束页码	170
卷号	23 期号:1
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).
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
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159796
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
推荐引用方式 GB/T 7714	Imaizumi F.,Nishii R.,Ueno K.,et al. Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment[J],2019,23(1).
APA	Imaizumi F.,Nishii R.,Ueno K.,&Kurobe K..(2019).Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment.Hydrology and Earth System Sciences,23(1).
MLA	Imaizumi F.,et al."Forest harvesting impacts on microclimate conditions and sediment transport activities in a humid periglacial environment".Hydrology and Earth System Sciences 23.1(2019).