藏锦鸡儿(Caragana tibetica)灌丛沙堆的形态与沉积物特征  

Morphology and sediment characterization of a scrub sandpile in Caragana tibetica

作　　者：韩敏 高永 贺明辉 燕如 白芳 杨文源 李小乐 袁晓满 杨娟 Han Min;Gao Yong;He Minghui;Yan Ru;Bai Fang;Yang Wenyuan;Li Xiaole;Yuan Xiaoman;Yang Juan(College of Desert Governance,Inner Mongolia Agricultural University,Hohhot 010018,China;Darhan Muminggan Joint Banner Forestry and Grassland Workstation,Darhan Muminggan Joint Banner 014500,Inner Mongolia,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]内蒙古农业大学沙漠治理学院,内蒙古呼和浩特010018 [2]达尔罕茂明安联合旗林业和草原工作站,内蒙古达尔罕茂明安联合旗014500 [3]中国科学院西北生态环境资源研究院,甘肃兰州730000 [4]中国科学院大学,北京100049

出　　处：《中国沙漠》2024年第2期185-195,共11页Journal of Desert Research

基　　金：国家自然科学基金项目(42267073)。

摘　　要：研究各演化阶段藏锦鸡儿(caragana tibetica)沙堆沉积特征与灌丛形态之间的耦合关系,分析演化过程中藏锦鸡儿灌丛沙堆随时间的变化,阐明各演化阶段藏锦鸡儿灌丛与沙堆的关联性以及沙堆表层沉积物特征,可揭示藏锦鸡儿灌丛发育过程中沙堆的变化及其灌丛阻沙能力的变化。基于野外调查,在样地选取3个演化阶段(发育阶段、稳定阶段和活化阶段)的藏锦鸡儿灌丛沙堆,测量灌丛和沙堆的形态参数,研究沙堆与藏锦鸡儿灌丛之间的相关关系,然后对不同部位的沉积物进行采样,分析沉积物特征。结果表明:藏锦鸡儿灌丛沙堆形态以椭圆形为主,各演化阶段藏锦鸡儿灌丛沙堆长轴、短轴、沙堆高、水平尺度、底面积和体积都呈现活化阶段>稳定阶段>发育阶段。沙堆沉积物发育阶段整体粒级含量居中;稳定阶段灌丛坡顶细砂和粉粒含量较大,呈现逐渐增加的趋势;活化阶段颗粒含量高,沿迎风坡底—坡顶—背风坡底,峰值呈先增大后减少的趋势,间接体现了灌丛沙堆对沙粒的拦截作用。灌丛形态与沙堆沉积物各参数相关性在稳定阶段最大,说明灌丛与沉积物之间由于灌丛呈现椭圆形,灌丛在稳定阶段固沙能力最强。藏锦鸡儿在发育阶段由于灌丛较小,形态与沙堆沉积物各参数相关性不强。藏锦鸡儿灌丛与沉积物之间随演化过程的进行越来越不稳定。To study the coupling relationship between the sedimentary characteristics of the sand pile and the morphology of the thicket of Caragana tibetica at each stage of evolution,to analyze the changes of the sand pile of the thicket of Caragana tibetica over time,to elucidate the correlation between the thicket and the sand pile as well as the characteristics of the sand pile surface sediment at each stage of evolution,and to reveal the changes of the sand pile and its sand-blocking ability of the thicket in the course of the development of the thicket of Caragana tibetica.The sandpile changes during the development of the Tibetan mallow scrub and its ability to block the sand.Based on the field survey,three typical thickets of the sandpile of Tibetan mallow scrub at different stages of evolution(developmental stage,stabilization stage and activation stage)were selected from the sample site,and the morphometric parameters of the thickets and the sandpile were measured to study the correlation between the sandpile and the Tibetan mallow scrub,and then the sediment characteristics were analyzed through the sampling of different parts of the sediments.The results showed that the morphology of the sandpile of the Tibetan Jindjir scrub was mostly oval,and the long axis(Ld),short axis(Wd),height(Hd),horizontal scale(HC),bottom area(Sd)and volume(Vd)of the sandpile of the Tibetan Jindjir scrub at each stage of the evolution showed the stage of activation>stabilization>development.The overall grain size content of the sand pile sediments in the development stage was intermediate;the fine sand and powder grain content at the top of the scrub slope in the stabilization stage was higher,showing a gradual increase;the particle content in the activation stage was high,and the peak value from the bottom of the windward slope-the top of the slope-the bottom of the leeward slope was showing a trend of increasing and then decreasing,which indirectly reflected the interception effect of the scrub sandpile on the sand particles.The cor

关 键 词：藏锦鸡儿(Caragana tibetica) 灌丛沙堆 演化阶段 形态特征 土壤粒度组成 

分 类 号：P931.3[天文地球—自然地理学]