摘要
以云岭牛（BMY）为试验对象,设计了不同梯度的载畜率试验（轻牧0.74AU/hm2、中牧1.52AU/hm2、重牧2.24AU/hm2）,在威提特东非狼尾草纳罗克非洲狗尾草-海法白三叶草地上研究不同载畜率对土壤养分的影响.结果表明：随着载畜率的增加,土壤表层0～10cm的速效氮和全钾含量呈增加趋势,而0～10cm土层的速效钾和土壤pH及10～30cm的速效磷呈下降趋势,有机质含量和全磷、10～30cm的全氮和pH值则没有明显的变化.土壤养分对季节的响应不同,其中速效氮、0～10cm速效磷、10～30cm速效钾在冬春季的含量显著高于夏秋季,0～10cm速效钾和全磷、各土层pH值和有机质均是冬春季显著低于夏秋季,而全氮和全钾含量变化不显著.综合考虑载畜率对全量养分、pH值和有机质含量的影响,认为中度放牧有利于土壤养分的稳定和维持.
Yunling beef cattles （BMY beef cattle）were chosen as the experiment subject and several levels of stocking rate （lightly grazing 0.74 AU/hm2,medium grazing 1.52AU/hm2 and heavily grazing 2.24 AU/hm2） were designed to study the effect of different stocking rate on soil nutrients in the grassland dominated with Pennisetum clandestinum ‘ Whittet’,Setaria sphacelata ‘ Narok’ and Trifolium repens‘Haifa’.The results indicated that the available N and total K in 0～10cm soil profile were increased with increasing the stocking rate.However,the content of available K and soil pH in 0～10cm soil profile and the content of available K in 10～30cm soil profile were decreased with increasing the stocking rate.There was no obvious change of the contents of organic matter,total P in all soil profile and the contents of total N and soil pH in 10～30cm soil profile with increasing the stocking rate.The response of different soil nutrient to the grazing season was different.The content of available N in all soil profile,available P in 0～10cm soil profile,available K in 10～30cm soil profile in winter-spring grazing was significant higher than that in summer-autumn grazing.However,the content of available K and total P in 0～10cm soil profile,organic matter and soil pH in all soil profile in winter-spring grazing was significant lower than that in summer-autumn grazing.And there was no significant change of the content of total N and total K between winter-spring grazing and summer-autumn grazing.Overall consideration of the effect of stocking rate on the total contents of nutrients,soil pH and the content of organic matter,it was concluded that medium grazing was good for the stabilization and maintenance of soil nutrient.
出处
《中国草地学报》
CSCD
北大核心
2013年第6期70-74,共5页
Chinese Journal of Grassland
基金
国家行业专项项目(200903060)
云南省科技计划(2012HA012
2012ZA024)项目资助
关键词
载畜率
放牧
土壤养分
Stocking rate
Grazing
Soil nutrients
