祁连山北麓中段青海云杉林土壤水热时空变化特征

doi:10.12118/j.issn.1000-6060.2020.04.18

Abstract

Abstract: This study analyzes the Picea crassifolia forest located at the altitude of 2 500 m to 3 300 m in the northern piedmont of the central Qilian Mountains,northwest China. Five automatic soil temperature and moisture monitoring systems were used to monitor this Picea crassifolia forest over a continuous three-year period. The paper seeks to explore the variations of soil moisture and temperature as well as interactions between soil moisture and temperature. Our results revealed as follows：（1） from 07：00 to 19：00,soil temperature showed an overall increasing trend. The average soil temperature was the lowest at 8：00,when it was 1.03℃. The average soil temperature was the highest at 18：00 when it was 1.32℃. Variations in soil moisture were small,with insignificant differences （P>0.05）. （2） The cold period （January-April,November-December） and warm period （May-October） each account for six months out of the year,respectively. Soil temperature and moisture increased during each month before August,with the average temperature and moisture of soil increasing by 2.21℃ and 0.021 m³·m^-3,respectively,each month. After August,the average soil temperature and moisture decreased by 3.12℃ and 0.017 m³·m^-3,respectively,each month. （3） There was a negative correlation between soil temperature and elevation （R=0.81,P<0.05）,whereas there was a binomial correlation between soil moisture and altitude （R=0.95,P<0.05）. Following an increase in altitude,soil moisture first increased and then decreased. （4） There was a negative correlation between soil temperature and soil depth （P<0.05）,while there was a linear positive correlation between soil moisture and soil depth （P<0.05）. For each additional layer,the average soil temperature decreased by 0.142℃ and soil moisture increased by 0.009 m³·m^-3. （5） There was a significant linear negative correlation between soil temperature and moisture in the Picea crassifolia forest studied （P<0.05）.

Key words: soil temperature, soil moisture, variations, Picea crassifolia, Qilian Mountains

MA Jian, LIU Xian-de, LI Guang, ZHAO Wei-jun, WANG Shun-li, JING Wen-mao, MA Xue-e. Spatial and temporal variations of soil moisture and temperature of Picea Crassifolia forest in north piedmont of central Qilian Mountains[J].Arid Land Geography, 2020, 43(4): 1033-1040.

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Spatial and temporal variations of soil moisture and temperature of Picea Crassifolia forest in north piedmont of central Qilian Mountains

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