Impact of Groundwater Depth and Soil Texture on Root Growth and Architecture of

DING Xiaoxue; ZHAO Chengyi; ZENG Yong; MA Xiaofei

doi:10.13870/j.cnki.stbcxb.2021.05.032

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Impact of Groundwater Depth and Soil Texture on Root Growth and Architecture of

更新时间：2025-03-12

- Impact of Groundwater Depth and Soil Texture on Root Growth and Architecture of
- Vol. 35, Issue 5, Pages: 235-241(2021)
- 作者机构：
  
  1. 中国科学院新疆生态与地理研究所阿克苏水平衡试验站,乌鲁木齐,830011
  2. 中国科学院大学,北京,100049
  3. 南京信息工程大学土地科学研究中心,南京,210044
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.05.032
  CLC： P641.2
- Published：2021
- 稿件说明：
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DING Xiaoxue, ZHAO Chengyi, ZENG Yong, et al. Impact of Groundwater Depth and Soil Texture on Root Growth and Architecture of[J]. 2021, 35(5): 235-241.
DOI：

DING Xiaoxue, ZHAO Chengyi, ZENG Yong, et al. Impact of Groundwater Depth and Soil Texture on Root Growth and Architecture of[J]. 2021, 35(5): 235-241. DOI： 10.13870/j.cnki.stbcxb.2021.05.032.

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（A1），60（A2），90 cm （A3）3个地下水埋深处理，砂土（B1）、砂壤土（B2）和黏壤土（B3）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A3B2处理下达到最大值。（2）根系消弱系数（β）、R50和R90（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，A2和A3地下水埋深下根系生物量呈B2>B3>B1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A3B1处理下达到最大14 cm。B2和B3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B1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。

Abstract

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 (A1)

60 (A2) and 90 (A3) cm were set up

and three soil textures of sand (B1)

sandy loam (B2) and clay loam (B3) 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 A3B2 treatment. (2) root weakening coefficient (β)

R50 and R90 (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 A2 and A3

the root biomass showed the trend of B2 > B3 > B1. 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 A3B1 treatment. Under B2 and B3 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 B1 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.

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