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干热河谷区不同坡位引种巨菌草根系生长特性研究 被引量:11

A study on the growth characteristics of roots of Pennisetum sinese in different slope of the dry-hot valley
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摘要 金沙江干热河谷生态脆弱区因高温和干旱等恶劣的自然环境条件,导致该区域的植被恢复和生态治理成为一大难题.以引种栽培的巨菌草为对象,研究了干热河谷核心区不同坡位巨菌草根系生长特征,分析了该物种在干热河谷区的生态适应性和引种可行性.结果表明:经过2年的引种试验,巨菌草在所选区域的上、中、下坡位均能正常存活和生长;巨菌草根系平均直径、生物量、C含量、C/N质量比及C/P质量比随根序等级的增加而增加,比根长(SRL)、根长密度(RLD)、根体积密度(RVD)、根表面积密度(RSAD)、N含量、P含量及N/P质量比随根序等级的增加而减小;不同坡位各等级根序根系生物量、直径、RLD、RVD及RSAD均表现为中坡>下坡>上坡,SRL表现为上坡>下坡>中坡;不同坡位各等级根序根系C含量及C/P质量比表现为下坡>上坡>中坡,N、P含量及N/P质量比表现为下坡>中坡>上坡,C/N质量比表现为上坡>中坡>下坡.总体来讲,巨菌草在干热河谷地区各坡位均能正常生长,中坡坡位的巨菌草生长状况最佳. The vegetation restoration and ecological management of Jingshajiang dry-hot valley has become a difficult problem due to the harsh nature environment such as high temperatures and drought. To study roots growth characteristics of introduced Pennisetum sinese in different slope positions in core area of dry-hot valley,ecological adaptability and feasibility was analyzed.The results showed that:(1) two years after introduction,most P. sinese in all slope positions survived and kept on growing;(2) the average diameter,biomass,content of C,m( C)/m( N) and m( C)/m( P) of the P. sinese roots increased by the increase of root orders,but root length( SRL),root length density( RLD),root volume density( RVD),root surface area density( RSAD),the contents of N,P and N/P decreased by the increase of the root orders;(3) root biomass,average diameter,RLD,RVDand RSAD under different root orders in all slope positions was ranked as follow: middle slope〉lower slope〉upper slope,and the SRLwas upper slope〉middle slope〉lower slope;(4) for all root orders,the C content and m( C)/m( P) in roots of all slopes was ranked as lower slope 〉upper slope 〉middle slope,the content of N,P and m( N)/m( P) was lower slope〉middle slope〉upper slope,m( C)/m( N) was upper slope 〉middle slope 〉lower slope. In general,P.sinese in all studied slope positions grows normally,the growth condition is best in the middle slope.
作者 杨森霖 张健 杨万勤 吴福忠 谭中越 陈良华 石坚 俞周池 YANG Sen-lin1, ZHANG Jian1, YANG Wan-qin1, WU Fu-zhong1, TAN Zhong-yue2, CHEN Liang-hua1 , SHI Jian1 , YU Zhou-chi1(1.Institute of Ecology & Forestry, Collaborative Innovation Center of Ecological Security in the Upper Reaches of Yangtze River Key Laboratory of Ecological Forestry Engineering, Sichuan Agricultural University, Chengdu 611130, China ; 2.Panzhihua Forestry Bureau, Panzhihua 617000, Chin)
出处 《云南大学学报(自然科学版)》 CAS CSCD 北大核心 2018年第3期577-585,共9页 Journal of Yunnan University(Natural Sciences Edition)
基金 国家自然科学基金(31300513) 长江上游生态安全协同创新中心开放基金
关键词 巨菌草 引种 根系生长特征 生态化学计量 金沙江干热河谷 Pennisetum sinese plant introduction root growth characteristics stoichiometric characters Jing-shajiang Dry-hot Valley
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