论文部分内容阅读
使用周长传感器(Circumference DC2)研究了太行山南麓低山丘陵上栓皮栎人工林树干直径的日变化及其影响因子.结果表明:在季节性干旱期间,栓皮栎树干的直径变化周期性明显,直径收缩与液流启动时间基本一致,直径最小值滞后于液流速率最大值3～4h;栓皮栎直径日最大收缩量(MDS)呈现低-高-低的变化趋势,与累积液流通量和叶片水势日差值极显著相关,与土壤含水量呈显著的二次方程关系.MDS值受气象因子变化的影响,与温度日差值、蒸汽压亏缺日差值和相对湿度日差值显著相关,而与太阳辐射日差值的相关性不显著.连续降水后,土壤水分不再是栓皮栎直径变化的限制因子,MDS值与累积液流通量、叶片水势、土壤含水量和气象因子差值的相关性均不显著.季节性干旱期和雨季的土壤含水量和温度是影响树干直径日变化的主要因子.
The diurnal variation of trunk diameter of Quercus variabilis forest and its influencing factors on the hilly land in the southern foot of Taihang Mountains were studied using Circumference DC2.The results showed that the diameter of the trunk of Quercus variabilis varied significantly in the period of seasonal drought, Diameter shrinkage and flow start time are basically the same, the minimum diameter lags behind the maximum flow rate of 3 ~ 4h; Quercus variabile diameter daily maximum shrinkage (MDS) showed low - high - low trend, and the cumulative liquid flux and Leaf water potential diurnal variation was significantly correlated with the soil moisture content was a significant quadratic equation.MDS values by the changes in meteorological factors, and the temperature difference, the difference between the daily value of vapor pressure deficit and relative humidity difference was significant But no significant correlation with the solar radiation daily difference.The soil moisture was no longer a limiting factor for the diameter change of Q. variabilis after continuous rainfall.The difference between MDS value and cumulative liquid flux, leaf water potential, soil water content and meteorological factor Value of the correlation was not significant.The seasonal dry season and rainy season soil moisture content and temperature are the main factors affecting the diurnal variation of trunk diameter.