不同草原类型天然牧草生长发育气象条件分析

通过对内蒙古草原3种不同草原类型,牧草生长发育过程和气象条件关系的分析研究,得出:主要牧草各发育期所需≥0℃积温变幅值和天然牧草各生育期所需热量;牧草返青与黄枯期主要取决于温度状况,而与水分关系较小;利用前10天的平均气温可以判断某生长期的发育进程;牧草对水分的需求主要体现在生长盛期,在典型草原和荒漠区更为明显,适当的干旱可使牧草有早熟现象;牧草的产量主要取决于水热搭配状况,通常情况下水分是典型草原与荒漠草原牧草产量的限制因子,热量可成为草甸草原的限制因子。旬降水量草甸草原达40mm、典型草原达30mm、草原化荒漠达10mm,产量有明显增加。

Analysis on Meteorological Condition of Growth and Development of Different Prairie Type Native Grass

Based on the analysis of the forage grass growth and development process,and the meteorological condition relations of three kinds of different prairie types in Inner Mongolian.Main forage grass various development periods that need ≥0℃ the accumulated temperature and energy were acquired,the forage grass turns green and yellow period were mainly decided by the temperature condition,but were small with the moisture content relations,the growth and development course of some vegetal period could be judged using previous ten day of average temperatures of growth advancement,the moisture demand was in the growth prime season,was more obvious in the typical prairie and wilderness area,the suitable drought could enable the forage grass to have the precocious phenomenon;The forage grass output was mainly decided by the water hot matching condition,the moisture content was restriction factor on typical prairie and wilderness prairie grass crop under normal case,the quantity of heat may become the meadow prairie the restriction factor.The ten-day period precipitation reaches 40mm in meadow steppe,30mm in typical steppe,10mm in steppification desert,the output had increases obviously.