祁连山东段六种灌丛降雨再分配特征

基于2018年6~9月野外采集的数据,采用野外观测与统计分析相结合的方法,研究了祁连山天祝地区金强河流域典型灌丛:山生柳(Salix oritrepha)、硬叶柳(Salix sclerophylla)、绣线菊(Spiraea salicifolia)、头花杜鹃(Rhododendron capitatum)、金露梅(Potentilla fruticosa)和千里香(Murraya paniculata)灌丛的降雨截留特征,分析了降雨对灌丛的穿透雨量、茎干流量和截留量的影响。结果表明:研究期间共观测到降雨22次,总降雨量为322.2mm。6种灌丛的茎干流量、穿透雨量和截留量与降雨量之间均呈极显著正相关关系(P<0.01),在观测的雨量范围内,茎干流率与穿透雨率随着降雨量的增加而增加,最后趋于稳定,而截留率则随着降雨量的增加而减小,最后也趋于稳定;6种灌丛的茎干流率和穿透雨率随着雨量级的增加而增大,而截留率则随之减小。在所有雨量级中,山生柳的茎干流率最大;在>20mm雨量级中,千里香灌从的穿透雨率最大,绣线菊灌从的截留率最大。

Characteristics of Rainfall Redistribution of Six Shrubs in Eastern Qilian Mountain

Based on the field experimental data from June to September in 2018,the rainfall redistribution of six typical shrubs(Salix oritrepha,Salix sclerophylla,Spiraea salicifolia,Rhododendron capitatum,Potentilla fruticosa and Murraya paniculata)were studied in Jinqiang River basin in Tianzhu area of Qilian Mountains to analyze the effect of rainfall on the throughfall,stemflow and interception of shrubs.The results showed that 22 times of rainfall were observed with a total precipitation of 322.2mm.The amount of throughfall,stemflow and interception of six shrubs showed a extremely significant positive linear correlation with rainfall amount(P<0.01).The stemflow ratio and throughfall ratio were increased with the increasing rainfall,and then finally stabilized,while the interception ratio was decreased with the increasing rainfall,and finally stabilized.With the increasing rainfall level,the stemflows ratio and throughfall ratio were increased,while the interception ratio was decreased.M.paniculata and S.salicifolia had the highest stemflow ratio and interception ratio in rainfall level>20mm,respectively,and S.oritrepha had the highest throughfall ratio in all ruinfall levels.