摘要
为揭示放牧压力对草原群落生产力和植物适应性生长的影响规律,开展了蒙古高原东部克氏针茅草原不同放牧梯度上的植物群落学特征调查,并对优势种的光合日进程、营养元素及脯氨酸含量等生理生态指标进行了测定.得出:(1)随放牧强度的增强,土壤水分逐渐降低、土壤容重和土壤硬度逐渐增加;(2)从轻牧到重牧,物种丰富度显著不同,中牧阶段最高;群落生物量随放牧强度增大而减少;(3)不同放牧梯度上,群落优势种的光合日进程均呈现"双峰"曲线;(4)在不同放牧强度下,群落优势植物营养元素地上、地下分配含量受土壤环境质量制约,表现出明显的差异性分布;(5)随放牧强度的增强和土壤水分的降低,群落优势种脯氨酸含量逐渐升高.
In order to reveal the regulations of the steppe productivity and adaptable growth under different grazing intensities, community characteristics, the psychological and biochemical indexes, diurnal photosynthetic courses, nutrients and proline contents of the dominant species were studied on the Stipa krylovii grassland under different gazing intensities. The main results were as follows. With grazing intensities increasing, soil moisture decreased, soil bulk density and hardness increased gradually. From light grazing to heavy grazing, species richness of a plant community was significantly different and the highest richness was under the moderate grazing intensities. With grazing intensities increasing, the aboveground biomass decreased. All of the diurnal photosynthetic courses of dominant species under different grazing intensities showed a ＂double peak＂ curve. Under different grazing intensities, the distribution of nutrition contents of the aboveground and underground were limited by the soil quality environment and clearly distributed in different spaces. With the increasing grazing intensities and the reducing soil moisture, proline contents of dominant species gradually increased.
出处
《内蒙古大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第6期695-702,共8页
Journal of Inner Mongolia University：Natural Science Edition
基金
国家自然科学基金资助项目(30870423)
中央高校基本科研业务费专项项目(DC10050101)
国家973资助项目(2009CB421308)
关键词
放牧梯度
草原群落
优势种
养分
生理生态学响应
grazing intensity steppe community dominant species nutrient physiological and ecological response
