结合1998年半干旱黄土丘陵区安塞的观测资料,对沙棘(Hippophae rhamnoides L.)的光合特性及影响因子进行了分析,结果表明:(1)沙棘光合速率具有明显的日变化和季节变化,月均值为11.64CO₂μmol/m²·s。(2)沙棘光合速率与环境因子(气温、相对湿度、光合有效辐射及CO2浓度)间有显著的相关关系,复相关系数为0.7168～0.8745;沙棘光合速率与林地土壤水分间有极显著的相关关系,复相关系数达0.9925,且沙棘光合速率的季节动态滞后于土壤水分的月变化。(3)沙棘光合速率与植物因子(气孔导度及细胞间CO₂浓度)间有十分显著的相关关系,气孔导度或细胞间CO₂浓度增大,沙棘光合速率增大,反之则减小,复相关系数达0.9715和0.9708。这为分析沙棘光合作用对环境因子的响应程度,分析沙棘最适生理生态条件,提高沙棘生产力提供科学依据。

According to the observed data at Ansai , Shaanxi Province in 1998, photosynthetic characteristics of Hippophae rhamnoides L .and its influence factors were studied in this paper .The experimental results show:(1) Photosynthetic rate has daily and seasonal variation, monthly average is 11.64 CO₂μmol/m²·s .(2) Photosynthetic rate has significant correlation with the environment factors ( temperature, relative humidity, photosynthetic active radiation and CO₂ concentration) , Raw R-squared is 0 .716 8 ～ 0 .874 5 .In annual growth, photosynthetic rate has significant correlation with soil moisture, and its seasonal changes fall behind that of soil moisture .( 3) Photosynthetic rate has significant correlation with plant factors ( stomatal conductance and intercellular CO₂ concentration) , If stomatal conductance or intercellular CO₂ concentration increases, photosynthetic rate increases, conversely it w ill decrease .These provided scientific basic data for analyzing degree of photosynthetic rate responding the environmental factors, analyzing optimum condition of physiological ecology and improving productivity .