摘要
采用热平衡液流测定技术，系统地研究了2年生枣树树干液流的变化规律及其与环境因子的关系。结果表明：枣树树干液流速率日变化是单峰曲线，峰值出现在13：00～14：00，不同季节的峰值差异较大；日累计液流量呈现“S”型曲线；春季液流日累计量达到了573．6g，秋季日累计量为197．0g；不同生长阶段的日均液流速率亦不同，生长初期（4～5月）液流速率较小，日平均为4．6g·h^-1；生长旺盛期（6～9月）的平均液流速率相对较大，平均为21g·h^-1；生态因子共同影响幼龄枣树的液流速率，其中太阳辐射强度、气温和土壤含水量的影响最为重要；得出了枣树液流速率与环境因子的线性回归模型，该模型可用来预测枣树潜在液流速率。
Rules of stem sap flow of two-year-old Chinese jujube （Ziziphus jujuba Mill. ） were systematically studied by the thermal balance measurement technology. The results showed that the curve of diurnal variation of stem sap flow rate had one peak, which occurred at 13：00 14： 00. There were great different between the peak values in different seasons. Diurnal accumulated stem sap flow showed S-shape curve. It was up to 573. 6 g in spring and only 197.0 g in fall. Daily average stem sap flow rate changed in different growth periods. It was very low in initial growth period from April to May （4.6 g · h^-1） and high in vigorous growth period from June to September （21 g · h^-1）. Ecological factors co-affected stem sap flow rate in young jujube. Among ecological factors, solar radiation intensity, air temperature and soil water content played significant rol＇es. A linear regression equation was set up, which could be used to predict potential stem sap flow rate in Chinese jujube.
出处
《经济林研究》
2007年第4期6-10,共5页
Non-wood Forest Research
基金
国家林业局948项目"抗蒸腾剂生产与应用技术引进"(2004-4-47)
关键词
枣树
液流
热平衡
生态因子
Ziziphus jujuba Mill.
sap flow
thermal balance
ecological factor
