摘要
5种不同放牧强度,历时150 d的滩羊放牧试验结果如下:1)放牧强度与草地禾本科牧草现存量之间存在极显著负相关关系和极显著回归关系,禾本科牧草现存量随放牧强度变化趋势是先增后减。当放牧强度为0.45只/(hm2.d)时,禾本科牧草的现存量最大。2)随着放牧强度增大,禾本科牧草所占总产草量的比例减小。当放牧强度为0.45只/(hm2.d)时,禾本科牧草所占比例最大。3)随着放牧强度的增大,豆科牧草所占比例呈先减后增再减的变化趋势,即呈“V”字型。4)当放牧强度逐渐增大时,杂类草变化趋势呈“N”型变化。5)随着放牧强度的增大,禾本科牧草比例相对降低,而豆科牧草比例相对增加。草地植被组成改变。以宁夏盐池草地现状,放牧强度不能大于0.45只/(hm2.d)。
A Tan sheep grazing experiment with five different grazing intensities and of 150 days was carried out. The results showed that： （1） there were extremely negative correlation and extremely significant regression between grazing intensity and the standing crop of gramineous pasture, and the varying tendency of the standing crop of gramineous pasture was first increased and then decreased. The standing crop of the gramineous pasture was the highest when grazing intensity was 0.45 sheep/ （hm^2·d）. （2） The rate of standing crop of gramineous pasture in gross pasture decreased with increased grazing intensity. The rate of standing crop of the gramineous pasture was the highest when grazing intensity was 0.45 sheep/（hm^2·d）. （3） The rate of standing crop of leguminous pasture decreased with increased grazing intensity. And the varying tendency line shaped like ＂V＂curve. （4） the varying tendency line liked ＂N＂ when grazing intensity increased. （5） The rate of gramineous pasture decreased and the rate of leguminous pasture increased with increased grazing intensity. The vegetation constitutes changed. From the present situation of not surpass 0. 45 sheep/（hm^2· d）. grassland in Ningxia, the grazing intensity can
出处
《草业科学》
CAS
CSCD
2006年第8期68-72,共5页
Pratacultural Science
基金
宁夏科技厅项目(2001-009-06)
关键词
放牧强度
植被组成
滩羊
草地
grazing intensity
vegetation constitute
Tan sheepj grassland
