文献类型：期刊文献

中文题名：2种水分条件下华北落叶松林的林下日蒸散量变化差异

英文题名：Difference of daily understory evapotranspiration under two water conditions in Larix principis-rupprechtii plantation

作者：韩新生[1,2] 王晓[1] 王彦辉[1] 李振华[3]

第一作者：韩新生

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所国家林业和草原局森林生态环境重点实验室,北京100091;[2]宁夏农林科学院林业与草地生态研究所宁夏防沙治沙与水土保持重点实验室/宁夏生态修复与多功能林业综合研究中心,宁夏银川750002;[3]新乡学院土木工程与建筑学院,河南新乡453003

年份：2024

卷号：41

期号：5

起止页码：949-958

中文期刊名：浙江农林大学学报

外文期刊名：Journal of Zhejiang A&F University

收录：CSTPCD;;北大核心:【北大核心2023】；CSCD:【CSCD2023_2024】；

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)。

语种：中文

中文关键词：水分条件;林下蒸散;华北落叶松人工林;半干旱区

外文关键词：water condition;understory evapotranspiration;Larix principis-rupprechtii plantation;semi-arid region

分类号：S716

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.]