杉木幼树树干液流影响因子及其对杉木林蒸腾量的贡献  

Impact Factors of Sap Flow of Chinese Fir Sapling and Its Contribution to Transpiration of Chinese Fir Forest

作　　者：刘鑫[1] 张金池[1] 庄家尧[1] 顾哲衍[1] 韩诚[1] 吴雁雯 

机构地区：[1]南京林业大学江苏省水土保持与生态修复重点实验室,江苏南京210037

出　　处：《水土保持通报》2014年第6期73-78,共6页Bulletin of Soil and Water Conservation

基　　金：林业公益性行业科研专项"长三角水源区面源污染林业生态修复技术研究"(201104055-1);国家自然科学基金项目(31170663);江苏省高等学校林学优势学科建设项目(164010641)

摘　　要：2012年9月至2013年8月,利用包裹式树干液流仪、插针式树干液流仪和小气象站对南京市东善桥林场的杉木幼树树干液流速率、杉木树干液流速率及环境因子进行了连续观测,研究了杉木幼树树干液流影响因子及其对杉木林蒸腾的贡献。结果表明:(1)杉木幼树液流速率的日变化具有季节差异性,均表现为单峰曲线并且日间液流速率大于夜间;(2)春、夏、秋、冬季液流速率峰值分别为:79.97,105.22,70.30,33.19g/h;(3)太阳辐射是影响杉木幼树树干液流速率的主导因子,其次是饱和水汽压差,日液流量与太阳辐射、空气温度、饱和水汽压差、各层次土壤温度呈极显著的正相关关系;(4)分别建立了液流速率、日液流量与环境因子的模型,可以较好地解释液流速率与日液流量的变化;(5)杉木幼树全年液流量对杉木林蒸腾量的贡献率为6.12%,夏季的贡献率最大。Based on the 12 months observation of the sap flow rate and environmental factors by using sap flow meter and mini weather station in Dongshanqiao Forest of Nanjing City from September 2012 to August 2013, the impact factors of the sap flow of Chinese fir sapling and its contribution to transpiration of Chinese fir forest was analyzed. Results indicated that： （1） The sap flow rate of Chinese fir sapling showed seasonal differences and the change of the sap flow rate took on a single-peak curve in different seasons. Sap flow rates in daytime were higher than those during the night. （2） The crest values of the sap flow rate in spring, sum- mer, autumn and winter was 79.97, 105.22, 70.30, 33.19 g/h, respectively. （3） The domenant environ- mental factor of sap flow rate was solar radiation, the next was vapor pressure deficiency. The correlation between daily sap flow and solar radiation, air temperature, vapor pressure deficiency, soil temperature at all layers showed a significant positive correlation. （4） The models to relate the sap flow rate, daily sap flow with environmental factors were established. These models could better explain the change of the sap flow rate and daily sap flow. （5） The ratio of contribution of Chinese fir saplings sap flow throughout the year to the total transpiration of Chinese fir forest was 6. 12%, and the ratio of contribution in summer was the largest.

关 键 词：杉木幼树 液流 环境因子 相关性 贡献率 

分 类 号：S715.4[农业科学—林学]