鄂温克族自治旗天然草原羊草发育期与气象因子关系

通过对内蒙古东北部鄂温克族自治旗草甸化草原羊草群落生长发育变化规律与气候因子进行相关分析,揭示了影响该地区羊草群落特征的关键气候因子,为当地合理利用草地和提高单位面积产草量以及应对气候变化提供科学依据。结果表明,影响羊草抽穗日期、籽粒成熟日期的因素很多，同时羊草抽穗日期的早晚与籽粒成熟日期的早晚虽然呈正向相关，但其它气象因子对羊草生长发育影响较大。经过大量数据对比分析，单一气温或降水因素对羊草发育期早晚影响不同。4月下旬至5月中旬气温、降水对羊草生长发育呈正效应，在其它条件相同情况下气温高并且降水量大，羊草有提前抽穗趋势，6月下旬至7月下旬气温、降水在满足基本需要的情况下对羊草生长发育呈负效应，气温高并且降水量大，羊草籽粒成熟较晚。

Relationship between Developmental Phases of Leymus Chinensis and Meteorological Factors in Inner Mongolia Natural Grasslands-A Case Study in Evenk Autonomous County

In order to provide scientific basis for rational utilizing of grassland,improving forage yield in per unit area and addressing climate change,the key meteorological factors influencing the community characteristics of Leymus Chinensis in Evenk Autonomous County meadow steppe,the northeast part of Inner Mongolia, were revealed by correlation analysis between the changing law of growth and development of Leymus Chinensis community and meteorological factors.The results showed that heading date and grain mature date could be influenced by a number of factors.Other meteorological factors were found to have great impact on growth and development of Leymus Chinensis in spite of the positive relationship between the time of heading date and grain maturity date.By the comparative analysis based on mass data,we found that single factors,temperature or precipitation had different influences on the time of Leymus Chinensis developmental phases.Temperature or precipitation showed positive effects on growth and development of Leymus Chinensis in late-April to mid-May.Earlier heading trends of Leymus Chinensis could be observed with high temperatures and high precipitation when other conditions were constant. Temperature or precipitation at the basic level in Late-June to Late-July showed negative effects on growth and development of Leymus Chinensis.High temperatures and precipitation resulted in the later grain maturity.