摘要
为探究二郎山公路边坡土壤养分和草本植物根系形态受季节及海拔的影响。设置4个典型样点(海拔高度分别为2040m、2197m、2209m、2211m),选取不同生长季节(春季3月、夏季6月、秋季10月)采样测定土壤理化性质和优势草本根系的形态特征值。结果表明:(1)各样点土壤在3月~6月间氮素含量增加,6月~10月间各样点土壤氮素含量下降,但铵态氮含量都呈现显著上升趋势,说明在这段时间内氨化作用明显;(2)主成分分析表明,硝态氮、有机质、总磷、铵态氮是影响土壤养分的主要因素;(3)各样点优势草本根系总长呈现先上升后下降的趋势,根尖数量方面随季节演替呈下降趋势。Pearson相关性分析显示,铵态氮能够促进边坡草本植物侧根的形成,但会抑制侧根的生长。
To explore the influence of season and altitude on soil nutrients and root characteristics of dominant herbs on the slope of road in Erlang Mountain,four typical sample places(the altitudes are2040 m,2197 m,2209 mand 2211 m)are selected under different growing seasons(spring in March,summer in June and autumn in October)to take sample and test the physical and chemical properties of soil and the morphological characteristics of dominant herbs.The results show that:(1)nitrogen content of soils in different sample places increases between March and June.Nitrogen content of soils in different sample places decreases between June and October,and ammonium nitrogen content increases obviously,which indicate that the ammoniation effect is obvious during this period.(2)Through the analysis on main components,it indicates that the nitrate nitrogen,organic matter,total phosphorus and ammonium nitrogen are the main factors affecting soil nutrients.(3)The total length of dominant herbs in different sample places increases first and then decreases,and the number of root tips decreases with the change of season.Through the Pearson correlation analysis,it shows that ammonium nitrogen can promote the formation of branch roots of slope herbs,but inhibit the growth of branch roots.
作者
宋伯翰
王俊敏
王浩浩
李伟
SONG Bo-han;WANG Jun-min;WANG Hao-hao;LI Wei(College of Life Science,Sichuan Normal University,Chengdu 610101,China;Key Laboratory of Mountain Surface Processes and Ecological Regulation,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences and Ministry of Water Resources,Chengdu 610041,China)
出处
《公路》
北大核心
2020年第4期331-338,共8页
Highway
基金
国家重点研发计划课题,项目编号2017YFC0504903。
关键词
公路边坡
植物生态
二郎山
土壤养分
根系特征
highway slope
plant ecology
Erlang Mountain
soil nutrients
root system characteristics
