两种小环境下刺槐树干液流变化规律的研究  

Studies on variation of sap flow of Robinia pseudoacacia in two microenvironments

作　　者：唐全[1] 曹帮华[1] 张玉娟[1] 秦永建[2] 吴丽云[3] 

机构地区：[1]山东农业大学农业生态与环境重点实验室,山东泰安271018 [2]泰安市岱岳区林业局,山东泰安271018 [3]临沂市林业科学研究所,山东临沂276000

出　　处：《山东大学学报（理学版）》2011年第1期6-10,共5页Journal of Shandong University(Natural Science)

基　　金：国家自然科学基金资助项目(30950016);国家农业成果转化资助项目(02EFN216700794)

摘　　要：用热扩散式树干径流计(TDP)和环境自动检测系统对黄河三角洲滨海盐碱地刺槐(Robinia pseudoacacia)-绒毛白蜡(Fraxinus velutina)混交林、刺槐纯林中刺槐单株的树干液流速率和环境因子进行了连续观测,结果表明:混交林中的刺槐单株树干液流日变化呈窄峰型曲线,纯林中的呈宽峰型曲线,二者峰值均出现在10:30左右,无明显启动时间,也没有明显的停止界限;混交林中刺槐单株的液流峰值高于纯林;混交林中刺槐单株的日平均液流速率为纯林中的145%。混交林土壤表层(0～60 cm)含水量大于纯林,含盐量小于纯林。多元逐步回归分析表明,影响混交林刺槐树干液流速率的主要因子是太阳辐射强度、大气相对湿度,影响纯林刺槐液流速率的因子依次为大气温度、太阳辐射强度。Single Robinia pseudoacacia tree sap flow and its environmental factors were respectively measured by means of TDP （ Thermal Dissipation Probe） and Portable-Meteorological Station in a 24-year-old pure forest and a mixed forest （Robinia pseudoacacia and Fraxinus velutina ） in Coastal Alkali-saline Soil of the Yellow River Delta. The results showed that diurnal variation of sap flow of the mixed forest displayed a narrow-peaked curve and that of pure forest displayed a wide-peaked curve, both peaks occurred at about 10：30, and there were no obvious starting and stopping sign of the sap flow even over night; The peak height of the mixed forest was higher than the pure forest; The daily average sap flow of the mixed forest was 145% of the pure stand. The water content of the mixed forest soil surface was higher than the pure stand and the salt content was less than the soil of the pure stand. Multiple regression analysis showed that the important factors effecting sap flow of the mixed forest were solar radiation, air humidity and the important factors affecting the pure forest were atmospheric temperature and solar radiation.

关 键 词：刺槐 混交林 树干液流 热扩散 滨海盐碱地 

分 类 号：Q945.79[生物学—植物学]