摘要
【目的】探讨土壤湿度对华北落叶松Larixprincipis-rupprechtii林下日蒸散变化的影响,为理解林地蒸散适应气候变化的机制及制定林水协调管理方案提供理论基础。【方法】以宁夏六盘山半干旱区叠叠沟小流域华北落叶松人工林为对象,设置了遮断降水输入(防水处理)和自然降水输入2种处理,人为加大土壤湿度梯度,分析2种土壤湿度条件下气温、太阳辐射、降水量等因子对林下日蒸散量的影响。【结果】在8、9、10月,自然降水的林下日蒸散量分别为67.06、36.32、29.49 mm·d^(-1),防水处理分别为54.22、20.07、11.35 mm·d^(-1),各月自然降水下的日蒸散量均大于防水处理。2种水分条件的林下日蒸散量随时间进程总体呈逐渐减小趋势,且自然降水下波动大于防水处理。8—10月,2种水分条件的林下日蒸散量差值总体呈先升后降的波浪状变化,比值总体呈逐渐升高的波浪状变化;在8、9、10月,各日自然降水日蒸散量与防水处理日蒸散量之差的均值依次为0.41、0.54、0.59 mm·d^(-1),比值依次为1.29、1.91、2.74。随潜在蒸散增大,2种水分条件的林下日蒸散量差与土壤体积含水量差的比值逐渐增加。土壤湿度对林下蒸散的影响在日潜在蒸散量小于3 mm·d^(-1)时较小,在大于3 mm·d^(-1)时增大,在大于5 mm·d^(-1)时增大极为明显。【结论】2种水分条件的林下蒸散影响因子大致相同,区别为自然降水的林下日蒸散量更多受降水影响,而防水处理则更多受土壤湿度影响。未来应增加多个土壤湿度梯度对林下蒸散差异的影响研究。图7表1参28.
[Objective]The purpose of this study is to explore the impact of soil moisture on the daily understory evapotranspiration in Larix principis-rupprechtii plantation,so as to provide a theoretical basis for understanding the mechanism of forest evapotranspiration adapting to climate change and developing plans for coordinated forest water management.[Method]Taking L.principis-rupprechtii plantation in Diediegou small watershed in semi-arid area of Liupan Mountain in Ningxia as the research object,two experiments(blocking precipitation or water-proof input,and natural precipitation input)were conducted.Soil moisture gradient was artificially increased,and the effects of environmental factors(air temperature,solar radiation intensity,precipitation,and so on)on the daily understory evapotranspiration under the two soil moisture conditions were analyzed.[Result]The daily understory evapotranspiration in August,September and October under natural precipitation condition was 67.06,36.32 and 29.49 mm·d^(-1),respectively,which was greater than that under water-proof treatment(54.22,20.07,and 11.35 mm·d^(-1)).The daily understory evapotranspiration under the two water conditions was characterized by a gradual decrease,and the fluctuations under natural condition was greater than those under water-proof treatment.From August to October,the difference in daily understory evapotranspiration under both water conditions generally showed a wavy pattern of first increasing and then decreasing,while the ratio showed a gradually increasing wavy pattern.In August,September and October,the mean difference between natural evapotranspiration and water-proof evapotranspiration was 0.41,0.54 and 0.59 mm·d^(-1),respectively,with ratios of 1.29,1.91 and 2.74,respectively.As the potential evapotranspiration increased,the ratio of daily evapotranspiration difference to soil volumetric water difference under both water conditions gradually increased.The effect of soil moisture on understory evapotranspiration was small when the daily potential evapotranspiration was less than 3 mm·d^(-1),but increased when the daily potential evapotranspiration was more than 3 mm·d^(-1),and increased significantly when the daily potential evapotranspiration was more than 5 mm·d^(-1).[Conclusion]The factors affecting daily understory evapotranspiration are roughly the same under both water conditions.The difference lies in that the daily understory evapotranspiration under natural condition is more affected by precipitation,while that under waterproof treatment is more affected by soil moisture.Future study should focus on the influence of multiple soil moisture gradients on understory evapotranspiration difference.[Ch,7 fig.1 tab.28 ref.]
作者
韩新生
王晓
王彦辉
李振华
HAN Xinsheng;WANG Xiao;WANG Yanhui;LI Zhenhua(Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration,Ecology and Nature Conservation Institute,Chinese Academy of Forestry,Beijing 100091,China;Key Laboratory of Desertification Control and Soil and Water Conservation of Ningxia/Research Center for Ecological Restoration and Multi-Functional Forestry of Ningxia,Institute of Forestry and Grassland Ecology,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan 750002,Ningxia,China;School of Civil Engineering and Architecture,Xinxiang University,Xinxiang 453003,Henan,China)
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2024年第5期949-958,共10页
Journal of Zhejiang A&F University
基金
中央级公益性科研院所基本科研业务费专项资金资助项目(CAFYBB2021ZW002)
国家自然科学基金区域创新发展联合基金资助项目(U20A2085,U21A2005)
国家自然科学基金国际(地区)合作与交流项目(42161144008)
宁夏自然科学基金资助项目(2023AAC03404)。
关键词
水分条件
林下蒸散
华北落叶松人工林
半干旱区
water condition
understory evapotranspiration
Larix principis-rupprechtii plantation
semi-arid region
作者简介
韩新生(ORCID:0009-0004-2890-1107),副研究员,博士,从事森林生态水文与植被多功能管理研究。E-mail:hanxs@caf.ac.cn;通信作者:王晓(ORCID:0009-0004-9855-2969),助理研究员,博士,从事森林生态水文研究。E-mail:wangxiao@caf.ac.cn。
