渭北旱塬混农林体系小气候环境与光合生产研究

通过对渭北旱塬的混农林体系小气候及作物光合效率、光能利用效率的测定分析结果表明：混农林体系能够调节改善防护区内小气候，具有显著的减灾效应，能够提高作物净同化率、作物生产率、相对生产率和作物光能利用效率。旱年作物光合效率提高幅度高于丰水年，混农林体系具有增产效益，增产幅度旱年大于丰水年，作物增产率与小气候环境、作物光合效率、光能利用效率关系密切。

Relations Between Microclimate Surroundings and Photosynthetic Productivity of Crops in An Agroforestry System on Arid Plateau of Weibei

The investigation, observation and analysis on microclimate surroundings photosynthetic efficiency and utilization ratio of solar energy of crops in an agroforestry system show that microclimate surroundings were improved and net assimilation rate, relative production rate,growth rate and utilization ratio of solar energy of the crops were increased. The rising scope of the photosynthetic efficiency of the crops in dry years was more than that in wet years,but the unit yield in wet years was more that in dry years. The growth rate was related to the microclimate surroundings,the photosynthetic efficiency and utilization ratio of solar energy of the crops.