Biology and Pedology

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

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  • 1 College of Forestry,Gansu Agricultural University,Lanzhou 730070,Gansu,China;
    2 Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Zhangye 734000,Gansu,China;
    3 International Science and Technology Cooperation Base for Forest Ecological Monitoring and Assessment in Qilian Mountains,Gansu Province,Zhangye 734000,Gansu,China;
    4 Gansu Qilian Mountain Forest Ecosystem Observation and Research Station,Zhangye 734000,Gansu,China

Received date: 2019-07-23

  Revised date: 2019-12-30

  Online published: 2020-11-18

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).

Cite this article

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 . DOI: 10.12118/j.issn.1000-6060.2020.04.18

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