摘要
在分析青海省兴海县天然草地产草量动态变化的基础上,利用灰色关联分析方法探讨了天然草地牧草产量的影响因素,定量分析了天然草地牧草产量与影响因素的关联程度。结果表明:高寒草地天然牧草产量变化的总体特征为波动中呈显著上升趋势,牧草产量以每年183.21 kg/hm2的速度上升。牧草产量前后5年对比分析,前5年牧草平均产量较多年平均值低646.4 kg/hm2,后5年平均牧草产量较多年平均值高646.4 kg/hm2,前后5年牧草产量平均值相差1 292.8 kg/hm2。在影响因子中,降水量与牧草产量之间的关系最密切,降水量是高寒草地牧草产量形成的限制因子。在水分条件充足的情况下,温度的升高有利于天然草地牧草产量的增加。
Grey correlation analysis was applied to discuss the effect factors of herbage yield dynamic, this paper quantitatively analyzed the interdependence of herbage yield and effect factors based on the herbage yield dynamic in natural grassland in Xinghai, Qinghai. Results showed that the general characteristics of herbage yield in natural grassland in high altitude areas appeared notable uptrend in volatility, the herbage yield increased 183.21 kg/ha yearly. The yields of first 5 years were 646.4 kg/ha lower than mean yield, by contrast yields of last 5 years were 646.4 kg/ha higher than mean yield, with the difference of 1292. 8 kg/ha in first 5 years and last 5 years. Among the factors, rainfall had close interaction with herbage yield, since it was the limiting factor for herbage yield form in high altitude areas. The rise of temperature could enhance the increase of herbage yield in natural grassland with sufficient water content.
出处
《贵州农业科学》
CAS
北大核心
2010年第1期134-137,共4页
Guizhou Agricultural Sciences
关键词
天然草地
牧草产量
灰色关联分析
natural grassland
herbage yield
grey correlation analysis
