摘要
应用热扩散法,采用ICT-2000TE环境与蒸腾系统同步监测了热带山地雨林尖峰栲边材液流速率和环境因子的变化.结果表明:尖峰栲边材液流速率的变化规律是晴天为单峰曲线、阴雨天气为双峰或多峰曲线.边材液流速率与太阳辐射、空气温度、蒸汽压亏缺、林内风速呈极显著正相关,与空气相对湿度呈极显著负相关.在旱季监测期间,其与土壤温度呈极显著正相关、与土壤湿度相关不显著;而在雨季,其与土壤湿度呈极显著正相关,与土壤温度相关不显著,说明降雨过程对边材液流影响较大.建立了旱季和雨季监测期间的边材液流与环境因子多元线性回归模型,经过F值检验,达极显著水平.旱季、雨季监测期间尖峰栲单株平均蒸腾量分别为103.5和41.3kg.d-1,单位林地面积蒸腾量分别为1.94和0.77mm.d-1.
By the method of thermal dissipation and using ICT-20OOTE apparatus made in Austral- ia, the Castanopsis fianfengensis sap flow and the variations of environmental factors in a mixed trop- ical montane rainforest at Jianfengling Nature Forest Reserve (18°36′N, 108°52′E, 860 m altitude) were measured synchronously during the dry and rainy seasons, 2002. The results showed :that the sap flow density of C. fianfengensis exhibited mono-peak pattern in clear days and multipeak pattern in cloudy or rainy days. Sap flow density had significant positive correlations with solar radiation, air temperature, vapor pressure deficit and wind speed, but negative correlation with air relative humidity. In dry season, sap flow density was positively correlated with soil temperature but less correlated with soil moisture, while it was in adverse in rainy season, indicating that rainfall had a greater influence on the sap flow. The linear regression patterns between Sap' flow and environmental factors were built, which all met the significance at 0. 01 level with F test. The mean transpiration rate of C. fianfengesis was 103.5 kg · d^-1 and 41.3 kg · d^-1 for whole tree, and 1.94 mm · d^ -1 and 0. 77 mm · d^ -1 for the stand in dry and rainy season, respectively.
出处
《应用生态学报》
CAS
CSCD
北大核心
2007年第4期742-748,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30170743)
中国海南岛尖峰岭热带林生态系统国家野外观测台站资助项目
关键词
边材液流密度
环境因子
蒸腾
尖峰栲
热带山地雨林
sap flow density
environmental factor
transpiration
Castanopsis fianfengensis
tropical montane rainforest.