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题名: 祁连山大野口流域土壤水热垂直分层变化特征分析
作者: 牛赟; 刘贤德; 吕一河; 金铭; 王顺利; 胡健
刊名: 干旱区资源与环境
出版日期: 2016
卷号: 30, 期号:6, 页码:141-146
关键词: 土壤水热 ; 垂直分层 ; 祁连山大野口流域
其他题名: The vertical layer characteristics of soil moisture and temperature in Dayekou basin of Qilian Mountains
中文摘要: 文中在祁连山大野口流域布设90个土壤水热监测探头,已取得的100多万个数据,且利用变异系数、相关系数、回归模型等方法对土壤水热与深度、海拔、坡度、郁闭度等因子相互关系进行分析。结果表明: 1)土壤水分与其深度呈二次函数的抛物线变化(Sdw =-0. 0057d~2 + 0. 3185~d + 23. 808,R~2 = 0. 9457),土壤温度与其深度呈线性变化(Sdt =-0. 0536d + 9. 192,R~2 = 0. 994),深度每增加10cm,其温度降低约0. 54℃。2)在0-80cm深度范围内,土壤水热变异程度呈"V" 字型; 高海拔半阴坡灌丛林土壤温度变化最剧烈,低海拔阳坡草地土壤变化较小。3)海拔对土壤水分是正影响,对土壤温度是负影响。随海拔增大,土壤水分呈波动性增大趋势,增大率约为2. 35% /100m,土壤温度呈波动性降低趋势,降低率约为0. 74℃ /100m; 坡度对20cm以上深度的土壤水热影响较大,对其它各层土壤水热影响较小; 郁闭度对20cm以上深度的土壤水热影响较大,对其它各层土壤水热影响较小; 对水分是中度负影响,对温度是低度正影响。4) 10-20cm深层的土壤水分回归模型S_(2w) = 0. 06a-0. 5s + 19. 87c-140. 48(R~2 = 0. 985,sigma = 1. 47,F_(0. 05) = 105. 86)在95% 置信范围可信可接受。研究结论可为探索流域水资源管理及利用提供科学依据和参考资料。
部门归属: 城市与区域生态国家重点实验室
英文摘要: 1 million data had been obtained by 90 of soil moisture and temperature detectors,and the relationship between soil moisture and temperature and depth,altitude,slope,crown density were analyzed by using the methods of correlation coefficient,variation coefficient and regression model. Results showed that: 1) The correlation between soil moisture and depth was a quadratic function and a parabola relation (Sdw =-0. 0057d~2 + 0. 3185~d + 23. 808,R~2 = 0. 9457). The correlation between soil temperature and its depth was Sdt = 0. 0536d + 0. 0536 (R~2 = 0. 994),and every addition of 10cm soil depth,the temperature decreased about 0. 54℃,and the relation function was linear. 2) The change intensity of soil moisture showed "V"-shape in the scope of the 0-80cm depth. The variation of soil temperature under sub alpine was the most severe on high altitude and half shady slope,and the variation of soil temperature under grassland was the lowest on low altitude slope and sunny or half sunny slope. The variation of surface soil temperature was the most severe,and the variation of temperature under soil lay from 40cm to 60cm was the lowest. 3) The influence of altitude on the soil moisture was positive, and the effect on soil temperature was negative. There was variation trend that soil moisture increased with altitude by rate of about 2. 35% /100m,that soil temperature decreased with altitude by rate of about 0. 74℃ / 100m. 3) The influence of slope on the soil moisture and temperature above 20cm depth was greater,but it on other depth soil moisture and temperature was smaller. The influence of crown density on the soil moisture and temperature above 20cm depth was greater,but it on other depth soil moisture and temperature was smaller. The influence of crown density on the soil moisture was moderate positive,and the effect on soil temperature was low negative. 4) The moisture regression model in soil 0-20cm depth (S_(2w) = 0. 06a-0. 5s + 19. 87c-140. 48,R~2 = 0. 985,sigma = 1. 47,F_(0. 05) = 105. 86) was accepted in 95% confidence range. This research conclusion provided basic data and resources for river basin water balance and water conservation function,the adjusting and management stand structure and utilization water resources.
内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36528
Appears in Collections:城市与区域生态国家重点实验室_期刊论文

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