非生长季降水对内蒙古草原生产力和物种组成的影响  

Influence of non-growing season precipitation on productivity and species composition of typical steppe in Inner Mongolia

作　　者：张洛梓 梁彪 陈清[1,4] 赵英[5] 林杉 ZHANG Luozi;LIANG Biao;CHEN Qing;ZHAO Ying;LIN Shan(Tianjin Key Laboratory of Water Resources and Environment,Tianjin Normal University,Tianjin 300387,China;School of Geo-graphic and Environmental Sciences,Tianjin Normal University,Tianjin 300387,China;Ulanchab Livestock Improvement Workstation,Ulanchab 012000,InnerMongoliaAutonomousRegion,China;CollegeofResourcesand Environmental Sciences,China Agricultural University,Beijing 100193,China;College of Resources and Environment,Ludong University,Yantai 264025,Shandong Province,China)

机构地区：[1]天津师范大学天津市水资源与水环境重点实验室,天津300387 [2]天津师范大学地理与环境科学学院,天津300387 [3]乌兰察布市家畜改良工作站,内蒙古自治区乌兰察布012000 [4]中国农业大学资源与环境学院,北京100193 [5]鲁东大学资源与环境学院,山东烟台264025

出　　处：《天津师范大学学报（自然科学版）》2021年第1期42-47,共6页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(31971437).

摘　　要：为了探究非生长季降水对草原生态系统生产力和植物物种组成的影响,选取内蒙古羊草草原不同放牧管理历史下的2块样地(中度和过度放牧样地),测定丰雪年份和一般年份的主要植物物种组成、地上部净初级生产力以及降水利用效率,分析内蒙古羊草草原生产力与降水量的相互关系.研究结果表明,非生长季降水的增加显著提高了地上部净初级生产力和降水利用效率,有利于促进冷蒿、冰草和大针茅等深根植物的生长;中度和过度放牧历史样地的生产力和降水利用效率对非生长季节降水量增加的响应基本一致.In order to explore the effect of non-growing season precipitation on the productivity and species composition change in typical steppe,two sampling sites with contrasting grazing history(moderate and heavy grazing plots)in Leymus chinensis steppe in Inner Mongolia were chosen.The main species composition,aboveground net primary productivity(ANNP)and pre-cipitation use efficiency(PUE)during heavy snowfall year and normal year were measured to analyze the relationship between ANPP and precipitation in Leymus chinensis steppe.Main results show that the increase of precipitation during non-growing season significantly improved ANPP and PUE,and promoted the growth of deep-rooted plants including Artemisia frigida,Agropyron cristatum,Stipa grandis,etc.The ANPP and PUE at moderate grazing plot had similar response to the increase of non-growing season precipitation with that at heavy grazing plot.

关 键 词：非生长季降水 放牧强度 草原生产力 深根系物种 降水利用效率 

分 类 号：Q948[生物学—植物学]