喜凉作物和喜温作物温度生长期日照时数均呈显著下降趋势；

The sunshine hours during the temperature-defined growth season of the crops decreased markedly;

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全区大部分区域喜凉作物和喜温作物温度生长期内参考作物蒸散量呈下降趋势，干燥度呈增加趋势。

In most parts of the area, the reference evapotranspiration of chimonophilous and thermophilic crops during their temperature-defined growth season decreased, and the aridity index increased.

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叶用莴苣属喜冷凉蔬菜，在炎热的季节栽培，植株往往遭受伤害或生长不良。

Adapted to cool climate, lettuce (Lactuca sativa L. ) is liable to be heat injured or grow poorly when grown in hot seasons.

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