| 祁连山林草复合流域土壤温湿度时空变化特征 |
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| 引用本文： | 赵维俊,刘贤德,金 铭,敬文茂,王顺利,任小凤,马 剑,武秀荣.祁连山林草复合流域土壤温湿度时空变化特征[J].土壤,2018,50(4):795-802. |
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| 作者姓名： | 赵维俊 刘贤德 金 铭 敬文茂 王顺利 任小凤 马 剑 武秀荣 |
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| 作者单位： | 甘肃省祁连山水源涵养林研究院;甘肃省森林生态与冻土水文水资源重点实验室 |
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| 基金项目： | 国家自然科学基金项目(91425301、31360201、41461004)、科技基础性工作专项(2014FY120700)、甘肃省自然科学基金项目(17JR5RG351)和国家林业局陆地生态系统定位研究网络项目(CTERN)资助。 |
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| 摘 要： | 利用祁连山森林生态站设在祁连山排露沟流域的青海云杉林和草地气象观测场土壤温湿度观测资料,采用对比分析及线性趋势等方法进行青海云杉林和草地2个不同下垫面土壤温湿度的时空特征分析。结果表明:(1)林草地土壤温度日变化表现为浅层(10 cm和20 cm土壤深度)土壤温度呈正弦曲线变化,深层(40、60、80 cm土壤深度)土壤温度约呈直线变化。土壤温度年变化表现为林地土壤温度7月底达到最高值,而后开始下降,翌年2月上旬达到最低值;草地土壤温度7月底达到最高值,而后开始下降,12月中旬达到最低值;林地封冻时长明显大于草地封冻时长。(2)林草地土壤湿度日变化不受太阳辐射的影响。林地不同土层土壤湿度年动态变化趋势均一致,呈现正弦曲线的变化规律;草地在土壤结冻后和未消融期间,土壤湿度较低且变化不明显;其他时间土壤湿度变化明显。(3)林地中,除40 cm深度外,其他深度土壤温湿度均保持在相对稳定的范围内,而且变化趋势基本一致。草地浅层土壤在土壤封冻前和解冻后,土壤温湿度变化趋势相反,封冻期间土壤温湿度亦保持在相对稳定的范围内,温度变化明显,湿度变化不明显;其他土层土壤温湿度总体变化趋势一致。
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| 关 键 词： | 林草复合流域 土壤温湿度 时空变化 祁连山 |
| 收稿时间： | 2017/8/22 0:00:00 |
| 修稿时间： | 2017/12/10 0:00:00 |
Spatio-temporal Change Characteristics of Soil Temperatures and Moistures in Forest and Grass Complex Basin in Qilian Mountains |
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| ZHAO Weijun,LIU Xiande,JIN Ming,JING Wenmao,WANG Shunli,REN Xiaofeng,MA Jian and WU Xiurong.Spatio-temporal Change Characteristics of Soil Temperatures and Moistures in Forest and Grass Complex Basin in Qilian Mountains[J].Soils,2018,50(4):795-802. |
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| Authors: | ZHAO Weijun LIU Xiande JIN Ming JING Wenmao WANG Shunli REN Xiaofeng MA Jian and WU Xiurong |
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| Institution: | Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province,Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province and Academy of Water Resources Conservation Forests in Qilian Mountains of Gansu Province |
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| Abstract: | The data of soil temperatures and moistures in 10 minute interval in the meteorological observation field under Picea crassifolia forestland and grassland in the Pailugou basin of the Qilian Mountain Forest Ecological Station were analyzed with the methods of comparative analysis and linear trend. Results showed that daily soil temperatures showed sinusoidal changes in 10 cm and 20 cm soil depths and linear changes in 40 cm, 60 cm and 80 cm soil depths. Soil temperature reached the highest at the end of July and then began to decline both for forestland and grassland, reached the lowest in early February for forestland and in late December for grassland. Freeze-up period of forestland is longer than that of grassland. Solar radiation did not influence the daily change of soil moisture in forestland and grassland. Dynamic changes of soil moistures were coincident and all showed sinusoidal changes in different soil depths under forestland. Soil moisture was low and changed little during the freeze-up period but changed obviously in other time. In forestland, soil temperatures and moistures were kept in a relatively stable range and with the same change trend in different soil depths except in 40 cm soil depth. In grassland, soil temperature and moisture changed inversely before soil freeze-up and after soil thaw. During the freezing period, topsoil temperature and moisture were also kept in a relatively stable range, with obvious change in temperature but unobvious change in moisture, while soil temperatures and moistures changed consistently in other soil depths. |
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| Keywords: | Forest and grass complex basin Soil temperature and moisture Spatial-temporal change Qilian Mountains |
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