暖温带森林木本植物展叶始期对低温和热量累积变化的响应
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Response of leaf-unfolding dates of woody species to variation of chilling and heat accumulation in warm temperate forests
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图1. 1955-2020年怀来气象站(黑色曲线)和2002-2019年北京森林站(灰色曲线)年平均气温年际变化趋势。 |
Fig. 1. Interannual change trend of mean annual temperature of the Huailai Meteorological Station during 1955-2020 (black curve) and Beijing Forestry Ecosystem Research Station during 2002-2019 (grey curve). |
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