西安植物园木本植物近十余年物候变化的特征分析

通过对1988-2002年西安市植物园20种木本植物物侯资料的分析。结果表明：近十余年西安市植物园20种木本植物物侯变化趋势明显表现为所有植物春季物侯逐年提前、大多数植物秋季物侯逐年推迟的趋势；春季物侯对气侯变化的响应程度显著大于秋季物侯。大多植物生殖生长期的物侯变化幅度大于营养生长期。因此，春季物侯和生殖生长期物侯更加适宜作为气侯变化的物侯指标。该研究对于评价物侯及物侯不同指标对气侯变化的响应有一定的参考价值。

Phenological Changes of Ligneous Plants in Xi''''an Botanic Garden in Last 15 Years

Phenological data of 20 ligneous plants in Xi'an botanic garden from 1988 to 2002 was analyzed.The results showed that the spring phenological phenomena of all observed 20 ligneous plants had been earlier since 1988,while the autumn phenological phenomena of most observed 20 ligneous plants had been delayed.The response of the spring phenological phenomenon to the climate change was more obvious than that of autumn phenological phenomenon.As to majority plants,the change extent of reproduction growing phenological changes was greater than that of nutrition growing phenological changes.The results of this article are of great value to evaluate phenology and the response of different phenological index to climate changes on climate changes.