不同放牧强度对荒漠草原优势植物功能性状的影响  

Effects of different grazing intensities on the functional characteristics of the dominant species in desert steppe

作　　者：马喆 李江文 张彬 韩国栋 武倩 Ma Zhe;Li Jiangwen;Zhang Bin;Han Guodong;Wu Qian(College of Grassland,Resources and Environment,Inner Mongolia Agricultural University,Hohhot,010018;Yan’an University,Yan’an,716000,China)

机构地区：[1]内蒙古农业大学草原与资源环境学院,呼和浩特010018 [2]延安大学生命科学学院,延安716005

出　　处：《草原与草业》2023年第4期22-28,共7页Grassland and Prataculture

基　　金：内蒙古农业大学人才引进项目(NDYB2020-5)。

摘　　要：放牧是草原生态系统的主要利用方式之一,植物功能性状反映了植物对环境变化的响应。为了探究不同放牧强度对植物功能性状产生的影响,基于内蒙古的荒漠草原研究长期放牧实验平台,选取无芒隐子草(Cleistogenes songorica)、冷蒿(Artemisia frigida)两个优势物种,分析这些植物的7个主要功能性状。研究结果表明:冷蒿的生殖枝自然高度、营养枝自然高度、冠幅、基茎和生殖枝数量随放牧强度的增大而显著降低。轻度放牧增加了无芒隐子草的基茎和生殖枝数量,但是中度和重度放牧对无芒隐子草的其他功能性状均产生负效应。无芒隐子草的功能性状在7月和8月两个不同月份中有显著差异,而冷蒿在不同月份中没有显著差异。由此可知,荒漠草原中不同优势植物对于不同的放牧强度和时间的响应不同,这些研究结果为探究荒漠草地植物对于长期放牧干扰而采取的响应策略具有十分重要意义。Grazing is one of the main utilization methods of grassland ecosystem,plant functional traits reflect the response of vegetation to environmental changes.In order to explore the effects of different grazing intensity on plant functional traits,two dominant species Cleistogenes songorica and Artemisia frigida were selected based on the long-term grazing experimental platform of desert steppe research in Inner Mongolia,and 7 main functional traits of these plants were analyzed.The results showed that the natural height of reproductive branches,natural height of vegetative branches,crown width,basal stem and number of reproductive branches of Artemisia frigida decreased significantly with the increase of grazing intensity.Light grazing increased the number of basal stems and reproductive branches of Cleistogenes songorica,but moderate and heavy grazing had negative effects on other functional traits of Cleistogenes songorica.The functional traits of Cleistogenes songorica differed significantly in July and August,while there was no significant difference in that of Artemisia frigida.Therefore,different dominant plants in desert steppe responded differently to grazing intensities and time,which was of great significance for studying the response strategies of plants in desert steppe to long-term grazing disturbance.

关 键 词：无芒隐子草 冷蒿 功能性状 放牧强度 

分 类 号：S812[农业科学—草业科学]