甘肃民勤荒漠区18种乔木物候与气温变化的关系

 在全球气候变暖的大背景下, 荒漠地区的植物物候是怎样响应气候变暖的？为了弄清这个问题, 对甘肃民勤荒漠区沙生植物园内18种乔木34 a的物候观测资料进行了分析。分析结果表明: 自1974年以来, 甘肃民勤荒漠区气温抬升幅度高于全国和全球水平, 尤其在2、3月气温抬升最为明显, 春季物候期提前幅度明显大于国内外其它文献报道; 物候期发生当月的平均气温对该物候期的影响＞物候期发生上月平均气温的影响＞年平均气温的影响; 研究区春季气温升高较其它地区更为明显, 这就是当地春季物候期提前幅度相对较大的原因。荒漠植物物候变化既是植物对气候变化的综合反应过程, 又是植物适应气候变化的过程。

RELATIONSHIPS BETWEEN PHENOLOGY OF 18 TREE SPECIES AND AIR TEMPERATURE CHANGE IN THE MINQIN DESERT AREA OF CHINA

Aims It is not clear if plants respond phenologically to global warming in desert area, and if they do, what is the pattern of the change? We analyzed phenological data observed from 18 tree species for up to 34 years in the Minqin Desert Botanical Garden. Our objectives were to determine the relationships between plant phenology and air temperature change in the Minqin Desert area. Methods The trend lines for change in temperature and phonology were linear, the correlation between temperature and phenology was expressed by a relationship coefficient and the significance of the relationship coefficient was examined by the t-test. Important findings The effect of the prior month’s temperature on phenology was less than that of the current month’s temperature, but more than that of the annual mean temperature. The temperature increase in spring was more obvious in the study area than other parts of the region, which was likely the reason that the local spring phenology had a relatively large advance. The change in plant phenology, particularly in the desert, was not only a response to climate change, but also an adaptation to climate change.