文献类型：期刊文献

中文题名：毛竹液流特征及其与环境因子的关系

英文题名：Phyllostachys pubescens sap flow and its relationships with environmental factors

作者：候小金[1] 谢锦忠[1] 格日勒图[1] 杨前宇[1]

第一作者：候小金

机构：[1]中国林业科学研究院亚热带林业研究所

年份：2010

期号：7

起止页码：1263-1269

中文期刊名：生态学杂志

外文期刊名：Chinese Journal of Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：浙江省重大科技专项(2008CO2001-1);中国林业科学研究院亚热带林业研究所中央级公益性科研院所基本业务费专项基金重点资助项目(RISF060701)

语种：中文

中文关键词：毛竹;液流速率;液流量;土壤水势;环境因子

外文关键词：Phyllostachys pubescens; sap flow rate; sap flux; soil water potential; environmental factor

分类号：Q945.17

摘要：运用Dynamax液流测量系统监测浙江庙山坞自然保护区毛竹液流的日变化,采用型号为EQ-15的土壤水势仪监测0～100cm土层的土壤水势,利用自动气象站同步监测太阳总辐射、空气温度、空气相对湿度、风速等气象因子。结果表明:晴朗天气条件下毛竹液流的日变化过程呈现单峰曲线,具有显著的昼夜变化规律,且变幅大;阴雨天气时液流日变化过程呈双峰或多峰曲线,而且日均液流速率和日液流量均低于晴朗天气,变化较平缓;不同径阶毛竹液流速率波动规律相同,但径级较大毛竹的日均液流速率和液流量较大一些。当0～100cm土层土壤水势在-13～-10kPa时,毛竹液流速率与土壤水势相关性不显著,但当土壤水势低于-200kPa左右时,液流速率和土壤水势呈正相关,土壤水分含量成为限制液流速率的主要因子之一;相关性分析表明,边材液流速率与空气温度、空气相对湿度、光合有效辐射、总辐射、水蒸气压亏缺呈极显著正相关,与空气相对湿度呈极显著负相关。太阳辐射、气温、空气湿度、风速等环境因子作自变量,以液流速率作因变量,经过逐步回归,建立了液流速率与环境因子的多元线性模型。
A Dynamax sap flow measuring system was applied to monitor the diurnal variation of sap flow velocity of Phyllostachys pubescens stands in Miaoshanwu Nature Reserve in Zhejiang.In the meantime,Equitensiometer （EQ-15） was applied to measure the soil water potential at 0-100 cm,and an automatic weather station was utilized to record the total solar radiation,air temperature,air relative humidity,and wind speed.The diurnal variation of the sap flow velocity exhibited mono-peak curve,with a distinct diurnal course on clear days,and a multi-peak pattern on cloudy or rainy days.The average daily sap flow rate and the diurnal sap flux were lower on cloudy or rainy days than on sunny days.The magnitude of the sap flow changed considerably between sunny and rainy days.The daily sap flux of P.pubescens with different stem diameter followed similar pattern,but the stands with bigger stem diameter had the faster sap flow velocity and the higher daily sap flux.When the soil water potential in 0-100 cm layer was between-13 to-10 kPa,no obvious correlation was found between the sap flow velocity and the soil water potential.However,when the soil water potential was less than-200 kPa,the sap flow velocity was positively correlated with the soil water potential,and soil moisture content became one of the main limiting factors.The sap flow velocity had significant positive correlations with solar radiation,air temperature,vapor pressure deficit,and wind speed,but negative correlation with air relative humidity.Taking the solar radiation,air temperature,vapor pressure deficit,air relative humidity,and wind speed as independent variables and the sap flow velocity as dependent variable,the multiple linear equations of the sap flow velocity and environmental factors were established by stepwise regressing.