积雪特性是研究融雪规律、融雪径流特点以及融雪侵蚀过程的基础,是进一步探究积雪化学性质和土壤冬季温湿度变化前提.积雪和土壤对气候变暖的响应是极为敏感的,气候变暖将显著影响积雪各项特性的变化特征和冬季土壤温度的变化.然而,气候变暖对这一过程的确切影响目前尚不明确.因此,本研究采用红外辐射仪对覆雪土壤和稳定期积雪进行增温处理以模拟未来气候变暖背景下这一过程的变化特征,结果表明:在气候变暖背景下,覆雪厚度和空气温度对土壤温度的影响是显著的,并通过检验后分别对H区表层、H区 10 cm土层、L区表层和N区表层建立了二元线性回归方程;关于积雪特性,本次试验积雪以干雪和微湿雪为主,全试验期积雪含水率始终<3%,高温加热区(H区)雪样含水率要高于中等加热区(L区);高温加热区(H区)雪样密度呈现先减小后增大的变化趋势,中等加热区(L区)雪样密度小幅度下降;积雪孔隙率全层保持在 75%～85%之间,同时各处理均表现出上层孔隙率显著大于下层的趋势;积雪粒径主要在 1.2～2.5 mm 之间,且上层雪粒相对独立,粒径较小,下层冰晶颗粒连结现象严重,冰晶颗粒较大,随着增温这种现象更加明显.本试验为未来研究气候变暖对积雪理化性质以及覆雪土壤理化性质的影响提供了一定的科学依据.
The response of snow cover characteristics and soil thermal state to climate warming in the stable period
Snow characteristics are the basis for studying snowmelt laws,snowmelt runoff characteristics,and snowmelt erosion processes.The response of snow and soil to climate warming is extremely sensitive,and cli-mate warming will significantly affect the changes of snow characteristics and soil temperature in winter.However,the exact impact of climate warming on this process is currently unclear.Therefore,in this study,an infrared radiometer was used to increase the temperature of the snow-covered soil and the 45-day stable snow of natural deposition to simulate the changing characteristics of this process under the background of future cli-mate warming.The results show that:under the background of climate warming,the influence of snow cover thickness and air temperature on soil temperature is significant,and after passing the test,binary linear regres-sion equations were established for H treatment surface layer,H treatment 10 cm soil layer,L treatment sur-face layer and N treatment surface layer;Regarding snow characteristics,the snow in this test is mainly dry snow and slightly wet snow,and the moisture content of snow is always<3%during the whole test period,the moisture content of snow samples in the high temperature heating area(H treatment)is higher than that in the medium heating area(L treatment);The density of snow samples in the high temperature heating area(H treat-ment)showed a trend of first decreasing and then increasing,and the snow density in the medium heating area(L treatment)decreased slightly;The porosity of the snow remained between 75%-85%in the whole layer,and the porosity of the upper layer was significantly larger than that of the lower layer in each treatment.The particle size of snow is mainly between 1.2-2.5 mm,and the snow particles in the upper layer are relatively in-dependent and the particle size is small,and the ice crystal particles in the lower layer are seriously connected,and the ice crystal particles are larger.This experiment provides a scientific basis for future research on the ef-fects of climate warming on the physical and chemical properties of snow and snow-covered soil.
climate warmingstable snow coverproperties of snowsoil thermal statelinear regression
万方数据
维普
