荒漠草地地区伊犁绢蒿分枝数目对放牧强度的响应  

Response of branch numbers of Seriphidum transiliense to grazing intensity in Xinjiang desert grassland

作　　者：荀其蕾 安沙舟[1] 孙宗玖[1] 梁娜[1] 杨合龙[1] 

机构地区：[1]新疆农业大学草业与环境科学学院,新疆草地资源与生态重点实验室,新疆乌鲁木齐830052

出　　处：《草业科学》2016年第4期748-754,共7页Pratacultural Science

基　　金：国家自然基金项目(31160477)

摘　　要：试验于2012-2013年在新疆昌吉阿什里乡进行,以新疆荒漠草地典型植物种伊犁绢蒿(Seriphidium transiliense)为研究对象,研究了不放(CK)、轻度放牧(LG)、中度放牧(MG)和重度放牧(HG)下伊犁绢蒿各级分枝数、营养枝和生殖枝的变化规律,通过在生长季内多次采样方法(每30d采样一次),比较不同放牧梯度下各级分枝数数目,营养枝与生殖枝的数目,以揭示伊犁绢蒿构件数目对放牧强度的响应机制。结果表明,各放牧梯度下伊犁绢蒿各级分枝数在CK区表现为二级分枝数>一级分枝数,在LG、MG和HG区则表现为分枝级数越高,分枝数越低;营养枝数目也在LG区表现有最大值,占全株分枝数的20.5%以上,营养枝数目的变化趋势为LG>CK>MG>HG;生殖枝数在各放牧处理间与不放牧条件下大部分差异显著(P<0.05),变化趋势为CK>LG>MG>HG。In order to study the effects of grazing intensity on the branch number of Seriphidurn transiliense and their response, the number and components of branch of S. transiliense were investigated every 30 days from 2012 to 2013 in desert grassland with four grazing intensities, including no grazing （CK）, light grazing （LG）, medium grazing （MG） and high grazing （HG） in Ashili Village, Changji City. The results showed that the branch numbers increased firstly and then decreased with the increase of grazing intensities which decreased in the following order： LG〉CK〉MG〉HG. The vegetative branch numbers had the same variations which de- creased in the following order： LG〉CK〉MG〉HG. The vegetative branch numbers was the maximum in lighting grazing blocks which accounting for 20.5% of total branch number. The productive branch number in no grazing blocks was significant more（P〈0.05）than that of the other three treatments. The reproductive branch numbers decreased with the increase of grazing intensities which decreased in the following order： CK〉 LG〉 MG〉 HG.

关 键 词：伊犁绢蒿 分枝数 营养枝数目 生殖枝数目 

分 类 号：S812.8[农业科学—草业科学]