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作 者:彭苓 韩磊[1] 韩永贵 柳利利 Peng Ling;Han Lei;Han Yonggui;Liu Lili(Ningxia University,Yinchuan 750021,P.R.China)
机构地区:[1]宁夏大学,银川750021
出 处:《东北林业大学学报》2022年第8期28-32,48,共6页Journal of Northeast Forestry University
基 金:国家自然科学基金项目(31760236);宁夏自然科学基金项目(2022AAC03094)。
摘 要:为明确干旱沙区典型防护林树种树干液流变化及其对环境因子的响应,以宁夏河东沙区主要造林树种丝绵木(Euonymus bungeanus)作为研究对象,采用热扩散茎流计从2019年5月至9月实时监测林木树干液流,分析其昼夜变化、夜间液流比例,结合太阳辐射、空气温度、空气湿度等气象因子的同步观测,分析大气环境因子对丝绵木树干液流昼夜变化的影响。结果表明:丝绵木液流密度整体呈现单峰趋势,于06:00启动,在12:15达到峰值(0.002 9 g·cm^(-2)·s^(-1))。丝绵木树干液流昼夜差异大,夜间液流密度均值为0.000 7 g·cm^(-2)·s^(-1)。各月液流总量变化范围为26.22~47.12 kg,由大到小表现为7月、8月、9月、5月、6月,夜间液流量最大值为8月(10.08 kg),最小值为9月(3.74 kg),夜间液流占比由大到小分别为6月夜间液流占比(22.43%)、8月夜间液流占比(22.41%)、5月夜间液流占比(13.23%)、9月夜间液流占比(10.81%)、7月夜间液流占比(10.26%),夜间液流不可忽视。丝绵木日间树干液流密度与太阳辐射(R)、水汽压差(V)、气温(T)、大气相对湿度(R)呈极显著相关关系,而夜间液流主要受大气温度影响。In order to clarify the changes in stem sap flow of typical protection forest species in the arid sandy land and its response to environmental factors, the main silvicultural tree species of Euonymus bungeanus in east sandy land of Yellow River in Ningxia was taken as the research object. The thermal dissipation probe technology was used to monitor stem sap flow in real time from May to September 2019, and analyzed the diurnal variation of stem sap flow and the proportion of sap flow at night, combined with the simultaneous observation of meteorological factors such as solar radiation, air temperature and humidity to analyzed the influence of atmospheric factors on diurnal variation of sap flow of Euonymus bungeanus. The stem sap flow density of E. bungeanus showed a unimodal trend, it was started at 6:00 and peaked at 12:15(0.002 9 g·cm^(-2)·s^(-1)). The sap flow of E. bungeanus varied greatly between day and night, the average sap flow density at night was 0.000 7 g·cm^(-2)·s^(-1), the variation of total stem sap flow from month to month ranged from 26.22 to 47.12 kg, in descending order of July, August, September, May and June. The maximum value of nighttime stem sap flow was 10.08 kg in August and the minimum value was 3.74 kg in September. Since the percentage of nighttime stem sap flow are in descending order of June(22.43%), August(22.41%), May(13.23%), September(10.81%) and July(10.26%), respectively, and the nighttime sap flow cannot be ignored. The daytime sap flow density of E. bungeanus was mainly influenced by solar radiation(R), water vapor pressure deficit(V), air temperature(T), and relative humidity(R), while the nighttime sap flow was mainly influenced by air temperature.
分 类 号:S792[农业科学—林木遗传育种] S715.4[农业科学—林学]
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