摘要
对矮嵩草及其株丛在不同放牧强度下分蘖数、分株数、生殖枝数以及株丛面积的变化反应进行研究。结果表明,适度放牧有利于分株数的增加,而放牧过重或过轻不能刺激分株的形成。长期轻度放牧有利于矮嵩草的分蘖,放牧5 a后各株丛平均生殖分蘖数在不同放牧强度间均无显著差异。放牧过重,大株丛的分蘖数显著下降,放牧强度对大株丛生殖生长的影响小,第6年时中度放牧大株丛的分株数和面积显著大于其他处理;第3年时重度放牧中株丛的分株数显著增加,中株丛的生殖生长对放牧强度的响应不敏感,其面积在较长期轻度放牧时增加明显;放牧条件下小株丛的分株数显著增加,小株丛营养枝受放牧强度的影响较小,第6年时生殖枝数和面积均显著增加,放牧处理间无显著差异。
The paper studied the change of tillers,ramet,stalk and area of Kobresia humilis genet in different size and different grazing intensity.The results showed that moderately grazing was benefit to increasing of ramets.Overgrazing and lightly grazing can not stimulate shaping of ramets.Lightly grazing for a long time was benefit to Kobresia humilis to tiller.Mean stalks of different size genets did not indicate significant difference after 5 years grazing.Tillers of big genet decreased significantly if overgrazing for a long time.Stalk number had less effect from grazing intensity.The number of ramets and area of big genet were much than of other treatment significantly in the 6th year of moderately grazing.The number of ramets of moderate genet increased significantly in the 3rd year of overgrazing.Its reproduction growth showed a not sensitive response to grazing intensity.Its area increased significantly when longer lightly grazing.The number of ramets of small genet increase significantly under the condition of grazing.The ability of tiller of small genet had a less effect on grazing intensity.Stalk and area of small genet were both increased significantly in the 6th year and had not significantly difference between among grazing treatment.
出处
《西北农业学报》
CAS
CSCD
北大核心
2011年第9期18-24,共7页
Acta Agriculturae Boreali-occidentalis Sinica
基金
国家自然科学基金项目(39960053)
青海省科技厅项目(2009-J-806)
关键词
矮嵩草
株丛大小
放牧强度
生长反应
Kobresia humilis
Size of genet
Grazing intensity
Growth response
