摘要
１９９３年在内蒙古典型草原研究了９种牧草的生长发育规律，测定了牧草的物候期、生长速度以及土壤含水量。结果表明，牧草的发育节律主要受温度和水分条件的影响，不同牧草发育对温度和水分的需求不同。牧草对当地气候条件长期适应的一个突出点是，大多数禾草的主要分蘖期推迟到夏末秋初，一般发生在快速生长结束时。每种牧草都有各自的生长规律，大多数牧草早春返青后不久生长较快，随后生长速度不稳定，拔节和抽穗期生长最快，此后生长缓慢和停止。牧草平均高度增长吻合Ｃｏｍｐｅｒｔｚ曲线：Ｈ＿ｔ＝Ｈ＿（ｍａｘ）·ｅ￣（－ｃａ－ｋｔ）。牧草平均高度增长与降水量积累、土壤含水量和≥０℃积温累积显著相关，并符合柯布─道格拉斯函数：ｌｏｇＹ＝Ｃ＋Ｂ＿１ｌｏｇｘ＿１＋Ｂ＿２ｌｏｇｘ＿２＋Ｂ＿３ｌｏｇｘ＿３。根据该地区牧草生长发育特点，提出了合理利用草地资源的建议。
he growth and development patterns of nine varieties of herbage were studied in 1993 in the Inner Mongolia steppe. The plants phenophases, growth rate and soil moisture content were measured.The results indicated that the development of the herbage was primarily affected by water and temperature.The development of different species re-quir different water and temperature conditions. The main tillering stage of most forage grasses appeared after rapid growing stage.There were different growth patterns for each variety.Initial growth was followed by rapid growth in early spring.Growth in the following period fluctuated.Rapid growth occured in the jointing and ear emergence stages.Slow growth and arrested growth occured in early autumn The herbage aver-age height increase conformed to the Compertz Curve(H_t=H_(max)·e￣(-ea-kt)).The growth patterns of the herbage were primarily affected by climatic factors. Mathematical mod-els of the herbage average height increase relating to accumulated precipitation,soil moisture content and cumulative temperature were developed(logY=C+B_1logx_1 +B_2logx_2 +B_3logx_3).Some suggestions were put forward on the rational utilization of the herbage resource according to the growth and development patterns of the herbage in this region.
出处
《中国草地》
CSCD
1994年第6期21-27,共7页
Grassland of China
基金
国家自然科学基金
关键词
典型草原
牧草
生长发育规律
steppe,herbage,growth and development patterns
