摘要
为深入理解黄土高原典型退耕物种沙棘的夜间蒸腾耗水规律,探究该植物水分利用机制,2021年7—8月,本研究利用包裹式液流传感器对黄土丘陵区羊圈沟小流域的沙棘树干液流速率进行了连续观测,采用了趋势预测法将夜间液流进行有效拆分,量化了夜间蒸腾和储水对夜间液流的贡献度,分析了沙棘夜间液流动态特征及其影响因素。研究结果表明:夜间液流量占整日夜间液流量的14.07%±5.64%。在小时尺度上,夜间液流与大气温度、相对湿度和水汽压差显著相关。沙棘夜间储水对夜间液流的贡献平均占比约为27.13%,夜间蒸腾对夜间液流的贡献平均占比约为72.87%;沙棘夜间储水和蒸腾的主要影响因素为相对湿度和土壤含水量,其占比主要影响因素为40—120 cm土壤含水量。该研究可为黄土高原地区植被恢复和管理提供理论依据。
In order to gain a deeper understanding of the nighttime sap flow density of the revegetation shrub species on the Loess Plateau of China,and to explore its water use strategies,the typical shrub species,hippophae rhamnoides(HR),were selected to measure sap flow density in the stem from July to August 2021 using heat balance.method in Yangjuangou catchment,Yan'an City,Shaanxi Province.The nighttime sap flow was effectively separated by trend prediction method,and the contribution of night transpiration and water storage to night sap flow was quantified.The dynamic characteristics and influencing factors of sap flow at nighttime were analyzed.On the hourly scale,the nighttime sap flow was significantly correlated with atmospheric temperature,relative humidity and vapor pressure deficit.The contribution of night water storage to nighttime sap flow was 27.13%,and the contribution of night transpiration to nighttime sap flow was 72.87%.The main factors of night water storage and transpiration were relative humidity and soil water content,with the soil water content 40-120 cm below ground the molt tmportant.The study would provide the theoretical basis for the vegetation restoration and management in the Loess Plateau.
作者
李瑞苹
方伟伟
Li Ruiping;Fang Weiwei
出处
《黄河文明与可持续发展》
2024年第1期69-80,共12页
Yellow River Civilization and Sustainable Development
基金
国家自然科学基金项目(项目号:42001020)支持
关键词
夜间液流
趋势预测法
夜间蒸腾
茎干储水
nighttime sap flow
trend prediction
night transpiration
stem water storage
