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【目的】研究喀斯特森林细叶青冈树干流特征及其与环境因子的关系。【方法】基于热扩散技术的液流探针和Campbell自动气象站,测定了贵州茂兰地区2012年3月至2014年2月喀斯特原生细叶青冈林(Cyclobalanopsis gracilis)的树干液流和气温、降水等环境因子。分析液流速率在不同天气(晴天、阴天和雨天)、不同季节条件下的变化过程及特征,及其对环境因子的响应。【结果】整个观测期内,青冈日平均液流速率(5.78±0.19)g/(m~2·s),不同天气日平均液流速率(g/(m~2·s))依次为:晴天(10.35)>阴天(3.28)>雨天(3.16)。青冈日平均液流通量(3.37±0.11)kg/d,阴天和雨天日液流通量分别仅为晴天(6.03 kg/d)的31.7%和30.6%。各季节的日平均液流速率(g/(m~2·s))表现为:夏季(8.28±0.38)>秋季(6.75±0.38)>春季(6.11±0.34)>冬季(1.91±0.15)。空气相对湿度(RH)与液流速率呈负相关,光照、饱和水汽压差(VPD)、气温(Ta)、土壤含水量等与液流速率呈正相关。【结论】在不同天气条件或季节,各环境因子对液流速率的影响程度不同。光照、VPD、RH、Ta是影响细叶青冈液流速率最主要的因子,土壤轻度干旱对细叶青冈液流速率没有影响。
【Objective】 The objective of this study was to investigate the characteristics of the main stream flowering of Cyclobalanopsis chungii in karst forest and its relationship with environmental factors. 【Method】 The flow probe and Campbell automatic weather station based on thermal diffusion technique were used to determine the sap flow and air temperature of the Cyclobalanopsis gracilis from March 2012 to February 2014 in Maolan, Guizhou. Precipitation and other environmental factors. The changing process and characteristics of flow rate in different weather (sunny, cloudy and rainy days) and different seasons were analyzed and their responses to environmental factors were analyzed. 【Result】 The results showed that the average daily flow rate of Cyclobalanopsis glauca was (5.78 ± 0.19) g / (m ~ 2 · s) and the average daily flow rate of different weather was (g / (m ~ 2 · s) Sunny (10.35)> Cloudy (3.28)> Rainy (3.16). The daily mean liquid flux of Cyclobalanopsis glauca was (3.37 ± 0.11) kg / d, while that of cloudy days and rainy days was only 31.7% and 30.6% respectively of sunny days (6.03 kg / d). The average daily flow rate (g / (m ~ 2 · s)) in each season showed: 8.28 ± 0.38 in summer, 6.75 ± 0.38 in autumn, 6.11 ± 0.34 in spring, and 1.91 ± 0.15 in winter. The relative humidity (RH) of air is negatively correlated with the flow rate, and the positive correlation between light and saturated water vapor pressure (VPD), temperature (Ta) and soil water content is positively correlated with the flow rate. 【Conclusion】 In different weather conditions or seasons, the impact of different environmental factors on the flow rate is different. Light, VPD, RH and Ta were the most important factors that affected the flow rate of P. xylostella, and mild soil drought had no effect on the flow rate of C. glauca.