冰川退缩迹地植被原生演替初期关键种的碳氮磷生态化学计量特征  

Characteristics of Organic Carbon,Total Nitrate,Total Phosphorus and Its Stoichiometry of Key Species on Primary Succession Stages of Vegetaion in Glacier Forehead in Gongga Mountain

作　　者：周萍[1,4] 庄文化 李明明[1,4] 龙翼[1] 史忠林 周继[1] Zhou Ping;Zhuang Wenhua;Li Mingming;Long Yi;Shi Zhonglin;Zhou Ji(Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, The Key Laboratory of Mountain Surface Processs and Ecological Regulation, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China;State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China;College of Hydraulic and Hydroelectric Engineering, Sichuan University, Chengdu, Sichuan 610065, China;University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]中国科学院、水利部成都山地灾害与环境研究所,山地表生过程与生态调控重点实验室,四川成都610041 [2]四川大学水利水电学院,四川成都610065 [3]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [4]中国科学院大学,北京100049

出　　处：《水土保持通报》2021年第2期1-9,共9页Bulletin of Soil and Water Conservation

基　　金：四川省重点研发计划项目“灾害地质体植被快速恢复技术与示范”(18ZDYF);“川中丘陵区坡耕地植物地埂坡式梯地建设关键技术研究”(2020YFS0022)。

摘　　要：[目的]对贡嘎山海螺沟冰川退缩迹地植被原生演替初期关键种柳叶菜(Epilobium hirsutum)和马河山黄芪(Astragalus mahoschanicus)碳氮磷含量及生态化学计量进行研究,掌握两关键种碳氮磷及其化学计量学特征,为预测未来在全球气候变化背景下冰川退缩区域环境变化及植被演替趋势研究提供理论支持。[方法]采用野外调查与室内分析相结合的方法,探讨贡嘎山海螺沟冰川退缩迹地植被原生演替序列初期关键种柳叶菜和马河山黄芪根、茎、叶、果实的碳、氮和磷含量及其化学计量学特征。[结果]柳叶菜根系有机碳含量变化范围为436~445 g/kg,较马河山黄芪根系有机碳含量高。不同器官的全磷含量均值柳叶菜为1.78 g/kg,马河山黄芪为1.30 g/kg。柳叶菜不同器官的有机碳含量变化依次为:根系>果实>叶片>茎,全氮含量变化依次为:叶片>根系>果实>茎,全磷含量表现依次为:果实>叶片>根系>茎。马河山黄芪不同器官的有机碳含量变化依次为:黄芪根系>果实>茎>叶片,全氮含量变化依次为:叶片>根系>果实>茎,全磷含量变化为:叶片>果实>根系>茎。柳叶菜不同器官的C/N高于马河山黄芪,柳叶菜和马河山黄芪不同器官的N/P变化范围为5.94~17.82。[结论]马河山黄芪高N/P,低C/P值反映了植物高生长率或繁殖输出,即生长竞争策略。与柳叶菜相比,马河山黄芪有快速生长的特性,以生长竞争优势即生长竞争策略战胜柳叶菜,推动了冰川退缩迹地植被演替进程。[Objective]The characteristics of organic carbon,total nitrate,total phosphorus and its stoichiometry of the key species in primary succession stages of vegetaion were explored in the Hailuogou glacier forehead in Gongga Mountain,in order to provide better and exactly prediction of the vegetation succession under the background of the globing warming.[Methods]Combined with field investigation and indoor experimental analysis,the organic carbon,total nitrogen and total phosphorus of the roots,stems,leaves,seeds of Epilobium hirsutum and Astragalus mahoschanicus were analyzed.[Results]The range of organic carbon of the Epilobium hirsutum root changed between 436—445 g/kg,which was higher than that of the Astragalus mahoschanicus root(416—423 g/kg).The concentrations of the organic carbon of different organs of Epilobium hirsutum were as follows:in roots>in seeds>in leaves>in stems,the concentrations of the total nitrogen were:in leaves>in roots>in seeds>in stems,and the concentrations of the total phosphorus were:in seeds>in leaves>in roots>in stems.While the concentrations of the organic carbon of different organs of Astragalus mahoschanicus were:in roots>in seeds>in stems>in leaves,the concentrations of the total nitrogen were:in leaves>in roots>in seeds>in stems,and the concentrations of the total phosphorus were:in leaves>in seeds>in roots>in stems.The ration of organic carbon to total nitrogen of different organs of Epilobium hirsutum was higher than that of Astragalus mahoschanicus.The ratio of total nitrogen and total phosphorus changed between 5.94 and 17.82.[Conclusion]The high ratio of N/P and low C/P of Astragalus mahoschanicus,which reflects the higher growth ratio and propagation rates.It also indicates that the Astragalus mahoschanicus has stronger growth competition strategy than that of the Epilobium hirsutum and better compelling the succession process.

关 键 词：贡嘎山海螺沟 冰川退缩迹地 植被原生演替初期 化学计量比 

分 类 号：Q948.1[生物学—植物学]