气候波动对西安39种木本植物展叶始期及其积温需求的影响
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王焕炯,陶泽兴,葛全胜
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Effects of climate variation on the first leaf dates of 39 woody species and their thermal requirements in Xi’an, China
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WANG Huan-Jiong,TAO Ze-Xing,GE Quan-Sheng
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表2 西安39种木本植物不同类群和生活型的展叶始期及其积温需求变化对比(平均值±标准偏差)
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Table 2 Comparison of the change in the first leaf date and its thermal requirement of 39 woody species among different groups and life forms in Xi’an (mean ± SD)
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| 变量 Variable | 类群 Group | 生活型 Life form | 年轻
Young | 中间
Intermediate | 古老
Ancient | 乔木
Tree | 灌木或小乔木
Shrub or small tree | 藤本
Liana | | 物种数量 N | 24 | 13 | 2 | 25 | 13 | 1 | 偏冷年物候变化(天)
PC in the cold year (day) | 8.6 ± 2.9a | 6.7 ± 2.6b | 13.2 ± 3.2a,b | 7.9 ± 3.0 | 8.8 ± 3.4 | 8.1 | 偏暖年物候变化(天)
PC in the warm year (day) | -8.6 ± 2.7 | -8.8 ± 2.2 | -7.2 ± 0.4 | -8.5 ± 2.6 | -8.5 ± 2.3 | -11.6 | 偏冷年积温需求变化(度日)
CTR in the cold year (degree day) | -26.2 ± 18.7 | -32.9 ± 16.4a | 0.7 ± 35.8a | -29.1 ± 21.5 | -23.2 ± 16.2 | -25.6 | 偏暖年积温需求变化(度日)
CTR in the warm year (degree day) | 62.2 ± 31.8 | 61.5 ± 26.7 | 70.7 ± 6.1 | 67.7 ± 32.6 | 54.3 ± 18.8 | 36.4 |
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