牧草物候特征对气候因子的响应

选取新疆乌鲁木齐市牧业气象试验站2004—2015年早熟禾（Poa annua）、黄芪（Astragalus membranaceus）、老鹳草（Geranium wilfordii）、老芒麦（Elymus sibiricus）、千叶耆（Achillea millefolium）5种天然牧草物候期资料和同期气象资料,采用统计分析法分析了物候期与气候要素间的关系。结果表明,5种牧草的返青期基本一致,开花期有提前有推迟,黄枯期普遍推迟,其中豆科牧草的黄枯期提前;气温是影响牧草春季物候期的重要因素,返青期和开花期的早晚与其前1~2个月气温的负相关程度较高,黄枯期与气温存在正相关,其中老芒麦的黄枯期与其前1~2个月的日照时数负相关程度较高。

Responses of Phenological Characters of Herbage to Climatic Factors

Based on data of phenological periods of five species of natural herbage（Poa annua, Astragalus membranaceus,Geranium wilfordii, Elymus sibiricus, and Achillea millefolium） as well as meteorological data from the Urumqi Meteorological Experimental Station for Animal Husbandry during 2004-2015, relationship between the phenological periods and climatic factors was analyzed by using statistical analysis method. The results show that the seedling establishment period of the five species of herbage was basically the same, and the flowering period was earlier or later, while the withering period was later mostly except for leguminous herbage; temperature was an important factor influencing the phenological periods of the herbage in spring, and the seedling establishment and flowering period correlated with temperature of previous 1-2 months highly negatively, and the withering period correlated with temperature positively; the withering period of E. sibiricus correlated with sunshine duration of previous 1-2 months highly negatively.