摘要
为揭示生长在不同地下水埋深和土壤质地的胡杨实生幼苗根系的不同生长适应策略,以胡杨实生幼苗为试验材料,设置30(A_(1)),60(A_(2)),90 cm(A_(3))3个地下水埋深处理,砂土(B_(1))、砂壤土(B_(2))和黏壤土(B_(3))3种土壤质地处理,研究了塔里木河流域地下水埋深和土壤质地对胡杨(Populus euphratica)实生幼苗根系生长及构型的影响。结果表明:(1)地下水埋深的增加,可促进胡杨幼苗根系形态的发育和根系生物量的积累,胡杨幼苗扎根深度、根系总长度、根系总体积和根系总表面积均在A_(3)B_(2)处理下达到最大值。(2)根系消弱系数(β)、R_(50)和R_(90)(50%和90%根系生物量分布深度)均与地下水埋深呈正比关系,土壤深层根系生物量随地下水埋深的加深而增加,A_(2)和A_3地下水埋深下根系生物量呈B_(2)>B_(3)>B_(1)的变化趋势;胡杨细根生物量在各处理下其土壤垂直分布均呈"单峰型"曲线变化规律。(3)根系平均连接长度随地下水埋深的加深而增加,在A_(3)B_(1)处理下达到最大14 cm。B_(2)和B_(3)条件下幼苗根系随地下水埋深的增加逐渐由趋向叉状型分支结构转变为趋向鲱骨型分支结构;各B_(1)处理下根系拓扑参数较大,幼苗根系分支结构一直趋向鲱骨型分支结构。研究结果可为塔里木河流域水资源优化配置提供依据。
In order to reveal the different growth adaptation strategies of the root system of Populus euphratica seedlings growing in different groundwater depth and soil texture,taking P.euphratica seedlings as experimental materials,three groundwater depths of 30(A 1),60(A 2)and 90(A 3)cm were set up,and three soil textures of sand(B 1),sandy loam(B 2)and clay loam(B 3)were combined in the study.The impacts of groundwater depth and soil texture on the root growth and architecture of P.euphratica seedlings in Tarim River Basin were studied.The results showed that:(1)The increase of groundwater depth promoted the development of root morphology and root biomass accumulation of P.euphratica seedlings.The root depth,total root length,total root volume and total root surface area of P.euphratica seedlings all reached the maximum under the A 3 B 2 treatment.(2)root weakening coefficient(β),R 50 and R 90(50%and 90%of root biomass distribution depth,respectively)were proportional to groundwater depth,and the root biomass of deep soil increased with the increasing of groundwater depth.Under the condition of A 2 and A 3,the root biomass showed the trend of B 2>B 3>B 1.The vertical distribution of fine root biomass presented a“single peak”curve under each treatment.(3)The average root connection length increased with the deepening of groundwater depth,and reached the maximum of 14 cm under the A 3 B 1 treatment.Under B 2 and B 3 conditions,with the increasing of groundwater depth,the root system of seedlings gradually changed from a forked branch structure to herring bone branching.Under the B 1 condition,the root topological parameters were larger,and the root branch structure of seedling tended to herring bone branching.These results could provide reference for the optimal allocation of water resources in the Tarim River Basin.
作者
丁晓雪
赵成义
曾勇
马晓飞
DING Xiaoxue;ZHAO Chengyi;ZENG Yong;MA Xiaofei(Aksu Water Balance Station,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011;Land Science Research Center,Nanjing University of Information Science&Technology,Nanjing 210044;University of Chinese Academy of Sciences,Beijing 100049)
出处
《水土保持学报》
CSCD
北大核心
2021年第5期235-241,248,共8页
Journal of Soil and Water Conservation
基金
国家自然科学基金项目(41671030)
中国科学院A类战略性先导科技专项(XDA2006030201)
中科院青年千人项目(Y772121)。
关键词
根系构型
地下水埋深
土壤质地
胡杨实生幼苗
root architecture
groundwater depth
soil texture
Populus euphratica seedlings
