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作 者:楼科尔 曲文杰 王磊[1,2,3,4] 王兴 郜永贵[5] 张波 尤万学[6] 杨新国 LOOU Keer;QU Wenjie;WANG Lei;WANG Xing;GAO Yonggui;ZHANG Bo;YOU Wanxue;YANG Xinguo(Ministry of Education Key Laboratory of Northwest Degraded Ecosystem Restoration and Reconstruction,Ningxia University,Yinchuan 750021,China;Cultivation Base of Northwest Key Laboratory of Land Degradation and Ecological Restoration,Ningxia University,Yinchuan 750021,China;School of Ecological Environment,Ningxia University,Yinchuan 750021,China;Ningxia Yellow River Wetland Ecosystem National Positioning Observation and Research Station,Yinchuan 750021,China;Zhongwei Sand Fixation Forest Farm,Zhongwei Public Works Section,China Railway Lanzhou Bureau Group Co.,Ltd.,Zhongwei 755000,Ningxia,China;Administration Bureau of Ningxia Zhongwei Shapotou National Nature Reserve,Zhongwei 755000,Ningxia,China)
机构地区:[1]宁夏大学西北退化生态系统恢复与重建教育部重点实验室,银川750021 [2]宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,银川750021 [3]宁夏大学生态环境学院,银川750021 [4]宁夏黄河湿地生态系统国家定位观测研究站,银川750021 [5]中国铁路兰州局集团有限公司中卫工务段中卫固沙林场,宁夏中卫755000 [6]宁夏中卫沙坡头国家级自然保护区管理局,宁夏中卫755000
出 处:《应用生态学报》2024年第11期3015-3022,共8页Chinese Journal of Applied Ecology
基 金:国家自然科学基金项目(32060313);宁夏重点研发课题项目(2021BEG03008)资助。
摘 要:为探究荒漠地区一年生草本植物对生境的适应性,本文以腾格里沙漠东南缘固沙植被区的沙米、百花蒿、虫实、雾冰藜4种常见一年生草本植物为研究对象,采用传统挖掘法收集植物根系,基于量化的根系形态指标,利用几何拓扑学和分形理论分析根构型特征,比较研究区4种一年生草本植物的根构型特征多样性及其适应机制的差异。结果表明:根冠比和根深宽比表现为沙米>百花蒿>虫实>雾冰藜,比根长和比表面积表现为沙米<百花蒿<虫实<雾冰藜;根系拓扑指数TI和修正拓扑指数q_(a)、q_(b)具有相同的趋势,均表现为沙米>百花蒿>虫实>雾冰藜;沙米、百花蒿、虫实、雾冰藜的根系分形维数分别为1.215、1.278、1.387、1.631,根系分形丰度分别为3.528、3.248、2.479、2.451。沙米和百花蒿采取高生长量资源对策,根系结构简单,倾向于鱼尾形分支结构,垂直方向资源获取能力和空间拓展能力较强;而雾冰藜和虫实采取高质量资源对策,根系结构更为复杂,倾向于叉状分支结构,具有更高的资源利用效率。To investigate the adaptability of annual herbaceous species in deserts,we collected root samples of four common annual herbaceous plants in the sand-fixing vegetation area on the southeastern edge of the Tengger Desert,namely Agriophyllum squarrosum,Stilpnolepis centiflora,Corispermum hyssopifolium,and Grubovia dasyphylla,through the traditional excavation approach.Based on the quantification of root morphology indicators,we analyzed root characteristics using geometric topology and fractal theory,and compared the diversity of root characteristics and the differences in adaptation mechanisms among the four species.The results showed that root-shoot ratio and root depth-width ratio of the four species followed an order of A.squarrosum>S.centiflora>C.hyssopifolium>G.dasyphylla.The specific root length and specific surface area followed an order of A.squarrosum<S.centiflora<C.hyssopifolium<G.dasyphylla.The root topology index TI and the modified topology indices q_(a) and q_(b) exhibited the same trend,with an order of A.squarrosum>S.centiflora>C.hyssopifolium>G.dasyphylla.The root fractal dimensions of A.squarrosum,S.centiflora,C.hyssopifolium,and G.dasyphylla were 1.215,1.278,1.387 and 1.631,and the root fractal abundances were 3.528,3.248,2.479 and 2.451,respectively.A.squarrosum and S.centiflora adopted a high growth resource strategy,featuring simple root structure,tending towards the fish-tail-shaped branching structure,and possessing strong abilities of vertical resource acquisition and spatial expansion,while C.hyssopifolium and G.dasyphylla adopted a high-quality resource strategy,having more complex root structure,with forked branching and higher resource utilization efficiency.
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