基于GIS技术的广西苦楝春季物候变化规律研究

Spring phenology variation of Guangxi bead tree (Melia azedarach) based on GIS technology

【目的】对广西苦楝春季物候变化的规律进行分析研究。【方法】主要采用广西物候资料、气象常规观测数据,结合相应地理空间数据资料,基于地理信息系统的空间分析功能进行统计分析。【结果】不同的物候期受地理因素影响的程度不同,在其营养时期的物候期受经度影响比纬度影响略大,在其生殖时期的物候期受纬度影响比经度影响大。从气象因子角度和地理因子角度分析可得到大致相同的广西苦楝春季物候变化的规律。【结论】广西苦楝物候期发生的时间是自西向东、自南向北、从河谷平原到山区推迟;对苦楝春季物候影响最大的气象因子是气温,影响时段主要集中在该物候期发生的前1个月到前3个月。

【Objective】In this study， the phenological changes of bead tree （Melia azedarach） during spring time in Guangxi were analyzed. 【Method】By mainly using Guangxi phenological data and conventional meteorological observation data combined with geographic spatial data， the special functions of geographical information system were statistical analyzed. 【Result】During various phenological periods in Guangxi， the geographical factors were affected in different degrees. During the nutritional phenological period， the effect of longitude on phenological periods was slightly larger than that of latitude; however， during the reproductive phenological period， the effect of latitude was slightly larger than that of longitude. From the meteorological factor perspective and the geographical factor perspective， the phenological change regulation of bear tree during spring time in Guangxi was analyzed with roughly the same results as this resulting research data. 【Conclusion】Guangxi bear tree phenological period was postponed from west to east， from south to north， and from plain valley to the mountains. The biggest influencing meteorological factor on phenology of bear tree in spring time was temperature， and the effecting time was mainly concentrated around 1 month to 3 months before phenology.