本文主要研究内容
作者祝维,余立璇,赵德海,贾黎明（2019）在《基于根系发育分级的砂壤土下成熟林木根系构型分析》一文中研究指出：基于根系发育分级标准分析不同等级根系的形态特征和各级根系的生长发育策略,可以为未来成熟林木根系预测和模型构建提供参考。该研究以30多年生的两个毛白杨(Populus tomentosa)和一个刺槐(Robinia pseudoacacia)的根系系统为研究对象,通过全挖法获取研究材料,以Rose(1983)提出的发育分级标准作为根系分级标准,分析了不同等级根系的基径、根长、连结长度、根系数量等形态特征以及不同等级根系间的拓扑关系。研究结果表明:1)3个根系系统的修正拓扑指数qa、qb均接近于0,拓扑指数TI均接近于0.5,说明3个根系系统均呈现叉状分支;3个根系系统垂直分布最深达到5.7–6.4 m,水平分布最长达到7.6–13.5 m;同一树种根系存在连生关系。2)3个根系系统能够分支到7–8级根;一级根基径和长度显著高于后几级根,一级根基径是后几级根的5.79–36.92倍,一级根长度是后几级根的1.45–9.11倍;根系数量随着根系等级增加先增后减,在三级根上达到最大值。3)在前三级根中,各级根上的连结长度从根基到根尖变化不大,说明子级根在母级根上分布均匀,能够充分高效地吸收土壤资源。4)母级根对子级根的基径拟合线性方程斜率,一级根最小(平均斜率0.15),二级根和三级根的斜率相差不大(平均斜率0.34、0.35),说明一级根优先发育自身直径,达到锚固和支撑的作用,二、三级根则会优先发育子级根,通过不断增强子级根以达到高效占领土壤空间的目的。5)基径对长度的拟合线性方程斜率随着根系等级增加而增加(平均斜率从10.46增长至90.43),说明高级别根系会倾向于发展根系长度来达到探索资源、拓展空间的目的。
Abstract
ji yu gen ji fa yo fen ji biao zhun fen xi bu tong deng ji gen ji de xing tai te zheng he ge ji gen ji de sheng chang fa yo ce lve ,ke yi wei wei lai cheng shou lin mu gen ji yu ce he mo xing gou jian di gong can kao 。gai yan jiu yi 30duo nian sheng de liang ge mao bai yang (Populus tomentosa)he yi ge ci huai (Robinia pseudoacacia)de gen ji ji tong wei yan jiu dui xiang ,tong guo quan wa fa huo qu yan jiu cai liao ,yi Rose(1983)di chu de fa yo fen ji biao zhun zuo wei gen ji fen ji biao zhun ,fen xi le bu tong deng ji gen ji de ji jing 、gen chang 、lian jie chang du 、gen ji shu liang deng xing tai te zheng yi ji bu tong deng ji gen ji jian de ta pu guan ji 。yan jiu jie guo biao ming :1)3ge gen ji ji tong de xiu zheng ta pu zhi shu qa、qbjun jie jin yu 0,ta pu zhi shu TIjun jie jin yu 0.5,shui ming 3ge gen ji ji tong jun cheng xian cha zhuang fen zhi ;3ge gen ji ji tong chui zhi fen bu zui shen da dao 5.7–6.4 m,shui ping fen bu zui chang da dao 7.6–13.5 m;tong yi shu chong gen ji cun zai lian sheng guan ji 。2)3ge gen ji ji tong neng gou fen zhi dao 7–8ji gen ;yi ji gen ji jing he chang du xian zhe gao yu hou ji ji gen ,yi ji gen ji jing shi hou ji ji gen de 5.79–36.92bei ,yi ji gen chang du shi hou ji ji gen de 1.45–9.11bei ;gen ji shu liang sui zhao gen ji deng ji zeng jia xian zeng hou jian ,zai san ji gen shang da dao zui da zhi 。3)zai qian san ji gen zhong ,ge ji gen shang de lian jie chang du cong gen ji dao gen jian bian hua bu da ,shui ming zi ji gen zai mu ji gen shang fen bu jun yun ,neng gou chong fen gao xiao de xi shou tu rang zi yuan 。4)mu ji gen dui zi ji gen de ji jing ni ge xian xing fang cheng xie lv ,yi ji gen zui xiao (ping jun xie lv 0.15),er ji gen he san ji gen de xie lv xiang cha bu da (ping jun xie lv 0.34、0.35),shui ming yi ji gen you xian fa yo zi shen zhi jing ,da dao mao gu he zhi cheng de zuo yong ,er 、san ji gen ze hui you xian fa yo zi ji gen ,tong guo bu duan zeng jiang zi ji gen yi da dao gao xiao zhan ling tu rang kong jian de mu de 。5)ji jing dui chang du de ni ge xian xing fang cheng xie lv sui zhao gen ji deng ji zeng jia er zeng jia (ping jun xie lv cong 10.46zeng chang zhi 90.43),shui ming gao ji bie gen ji hui qing xiang yu fa zhan gen ji chang du lai da dao tan suo zi yuan 、ta zhan kong jian de mu de 。
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论文详细介绍
论文作者分别是来自植物生态学报的祝维,余立璇,赵德海,贾黎明，发表于刊物植物生态学报2019年02期论文，是一篇关于发育分级标准论文,根系分级论文,根系构型论文,成熟林木论文,砂壤土论文,植物生态学报2019年02期论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自植物生态学报2019年02期论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：发育分级标准论文; 根系分级论文; 根系构型论文; 成熟林木论文; 砂壤土论文; 植物生态学报2019年02期论文;