西北林学院学报2026，Vol.41Issue(1)：48-59,12.DOI:10.3969/j.issn.1001-7461.2026.01.05
土壤水分和林下植被对白榆蒸腾作用的影响
Effect of Soil Moisture and Understory Vegetation on Transpiration of Ulmus pumila
摘要
Abstract
This study explored the effects of soil moisture and understory vegetation on the transpiration of Ulmus pumila in Bashang area of northern Hebei province,and provide a theoretical basis for the sustain-able management of plantation and the effective management of water resources in forest land.A two-fac-tor and two-level completely randomized watering and understory vegetation removal experiment was con-ducted on a monoculture Ulmus pumila plantation in Kangbao County,Zhangjiakou City,Hebei Province.Four treatments were set up:non-removal of understory vegetation-no watering(CK),non-removal of un-derstory vegetation-watering(WJ),removal of understory vegetation-no watering(CW),and removal of understory vegetation-watering(CJ).The Granier thermal diffusion technique was applied to continuously monitor sap flow rate(Js),during which photosynthetically active radiation(PAR),air temperature(Ta),air relative humidity(RH),wind speed(WS),and soil volumetric water content(SWC)were moni-tored to clarify the variation in Js.Relationships with the various environmental factors and Js were ana-lyzed.The research showed that:1)SWC in the study area is under a natural deficit state.Js increased gradually after watering,reaching and maintaining a stable state after 5 days(P＜0.05)under a no wate-ring treatment.Two-factor analysis of variance showed that removal of understory vegetation as well as combined watering and vegetation removal have no significant effect on Js(P＞0.05).2)The diurnal vari-ation of Ulmus pumila Js under different treatments showed a single peak curve of'high in day and low in night',and there was a weak sap flow at night.CJ treatment and CK treatment achieved the largest and smallest Js respectively,ranging between 0.022-0.054 g/(cm2·s)and 0.004-0.020 g/(cm2·s),respec-tively.3)PAR was the dominant environmental factor under watering and non-watering treatments.The rank of the environmental factors in terms of their total effects on Js were:PAR＞Ta＞SWC＞RH＞WS.Watering heightened the effect of meteorological factors on Js.Soil drought may be the main factor limit-ing transpiration of Ulmus pumila in Bashang,northern Hebei province.In the production practice,we can choose to retain the understory vegetation,and ensure the normal water physiological activities of Ulmus pumila plantation by watering measures at the appropriate time.关键词
白榆/林下植被/土壤水分/树干液流/气象因子Key words
Ulmus pumila/understory vegetation/soil moisture/sap flow/meteorological factors分类
农业科技引用本文复制引用
魏可新,李玉灵,朱琪,任梦瑶,徐学华,马增旺,高云昌,李晓刚..土壤水分和林下植被对白榆蒸腾作用的影响[J].西北林学院学报,2026,41(1):48-59,12.基金项目
河北省省级科技计划资助项目(22326808D) （22326808D）
河北省林草关键技术创新与示范项目(2301085) （2301085）
河北省林草关键技术创新与示范"揭榜挂帅"项目(2025JBGS0001-5) （2025JBGS0001-5）
塞罕坝周边水源涵养功能区山水林田湖草沙一体化治理应用示范项目(244C6401D) （244C6401D）
2024年度中央财政林业科技推广示范资金项目"拉萨河流域典型生态脆弱区治沙植被建设技术应用与推广"和"西藏退化草原封育修复技术推广示范". （）
