短花针茅草原植物群落养分对放牧强度季节调控的响应

Seasonal Regulation of Grazing Intensity on Plant Communities Nutrients on Stipa breviflora Desert Steppe

为探讨短花针茅荒漠草原群落养分含量在放牧强度季节调控下的响应规律,文中基于放牧强度季节调控试验设计,采用对比分析、灰色关联及回归建模分析方法,针对短花针茅荒漠草原植物群落养分含量展开研究,得到结果如下。短期放牧对群落养分含量影响较小,导致放牧处理之间养分含量差异不显著,但采用回归建模可获得具有指导意义的理论模型;春季放牧强度应该严格控制在适度放牧以下(0.96只羊/hm2·a);当春季适度放牧,夏季放牧强度应该小于1.08只羊/hm2·a,秋季应该适牧。当春季休牧,夏季可以是试验设计的任意放牧强度,但秋季放牧强度应该控制在1.08只羊/hm2·a以内。

Experimental design of seasonal regulation of grazing intensity was adopted in this paper to explore the response of communities nutrient content in Stipa breviflora desert steppe, which used method of comparative analysis, gray correlation and regression modeling analysis for study. The results showed short- term grazing less affected on community nutrient content, in which between grazing treatments were not significant, but the regression model can obtain a theoretical model that has guiding significance. Spring grazing intensity should be strictly controlled under moderate grazing （0.96 sheep / hm^2 · a）. Summer grazing intensity should be less than 1.08 sheep / hm^2 · a at spring moderate grazing, while autumn should be appropriate for moderate grazing. When it is banning grazing in spring, summer can be any grazing intensity of experimental design, but autumn grazing inten- sity should be controlled under 1.08 sheep / hm^2 · a.