植物研究 ›› 2024, Vol. 44 ›› Issue (2): 267-278.doi: 10.7525/j.issn.1673-5102.2024.02.012
• 生理与生态 • 上一篇
杨立学1, 刘士林1, 付瀚萱1, 周思雨1, 刘会锋2, 申方圆1()
收稿日期:
2023-10-07
出版日期:
2024-03-20
发布日期:
2024-03-11
通讯作者:
申方圆
E-mail:shuke9197@126.com
作者简介:
杨立学(1973—),男,教授,主要从事森林培育学研究。
基金资助:
Lixue YANG1, Shilin LIU1, Hanxuan FU1, Siyu ZHOU1, Huifeng LIU2, Fangyuan SHEN1()
Received:
2023-10-07
Online:
2024-03-20
Published:
2024-03-11
Contact:
Fangyuan SHEN
E-mail:shuke9197@126.com
摘要:
全光条件下紫椴(Tilia amurensis)更新困难,植被控制通过改变光照条件和土壤质量能够促进目的树种生长,研究植被控制强度对紫椴幼树根系性状和土壤因子的影响,为紫椴人工林培育提供支撑。以株行距为1.5 m×1.5 m的紫椴人工林(5年生)为对象,设置不同植被控制强度:幼树半径75 cm内所有灌草去除(T75)、半径50 cm范围灌草去除(T50)、半径30 cm范围灌草去除(T30)和不去除灌草(CK),测定不同植被控制强度下紫椴幼树吸收根和运输根的形态学性状、全量养分和非结构性碳水化合物等指标及土壤理化性质,揭示植被控制对根系性状和土壤因子的影响。植被控制显著改变了紫椴幼树所处环境中光照强度,其中,T75处理下光照强度最大,光照强度随着植被控制强度减弱而显著降低(P<0.05)。植被控制均显著降低了土壤全碳、全氮、速效氮和有效磷含量。随着植被控制强度的减弱,细根的直径、碳磷比、可溶性糖和淀粉含量均减小,比表面积、比根长、全碳、全氮和全磷含量均增加。土壤因子对紫椴幼树吸收根和运输根根系性状的变异的解释度分别为43.2%和37.9%。植被控制强度越大,紫椴幼树获得的光照强度越大,紫椴幼树根系形态、化学计量和生理特征随植被控制强度的变化均发生适应性改变,通过提高紫椴根系比表面积、比根长、全碳、全氮和全磷含量以增强幼树对低光条件的适应。植被控制强度变化下光照条件和土壤因子的改变可能是解释紫椴幼树根系性状变化的两个主要因素。
中图分类号:
杨立学, 刘士林, 付瀚萱, 周思雨, 刘会锋, 申方圆. 植被控制对人工更新紫椴幼树根系性状的影响[J]. 植物研究, 2024, 44(2): 267-278.
Lixue YANG, Shilin LIU, Hanxuan FU, Siyu ZHOU, Huifeng LIU, Fangyuan SHEN. Effects of Vegetation Control on Root Traits of Artificial Regeneration of Tilia amurensis Saplings[J]. Bulletin of Botanical Research, 2024, 44(2): 267-278.
表2
紫椴吸收根性状与土壤因子的相关性
因素 Factors | 土壤pH Soil pH | 土壤含水量 Soil moisture | 土壤全碳 Soil total carbon | 土壤全氮 Soil total nitrogen | 土壤全磷 Soil total phosphorus | 土壤速效磷 Soil available phosphorus | 土壤有效氮 Soil available nitrogen |
---|---|---|---|---|---|---|---|
根直径 Root diameter | -0.025 | -0.051 | -0.242 | -0.322 | -0.084 | -0.507* | -0.125 |
比表面积 Specific surface area | -0.030 | -0.128 | 0.141 | 0.253 | 0.199 | 0.411 | -0.012 |
比根长 Specific root length | -0.139 | -0.066 | 0.128 | 0.205 | -0.046 | 0.347 | 0.099 |
组织密度 Root tissue density | -0.135 | 0.069 | -0.171 | -0.249 | -0.352 | -0.377 | 0.105 |
根全碳 Root total carbon | 0.543* | 0.320 | 0.586** | 0.472* | 0.417 | 0.370 | 0.200 |
根全氮 Root total nitrogen | 0.272 | 0.001 | 0.417 | 0.590** | 0.356 | 0.534* | 0.253 |
根全磷 Root total phosphorus | 0.257 | 0.102 | 0.391 | 0.408 | 0.381 | 0.386 | 0.162 |
可溶性糖 Soluble sugar | -0.324 | 0.012 | -0.402 | -0.532* | -0.104 | -0.071 | -0.256 |
淀粉 Starch | -0.697** | -0.436 | -0.734** | -0.723** | 0.534* | -0.223 | -0.335 |
表3
紫椴运输根性状与土壤因子的相关性
因素 Factors | 土壤pH Soil pH | 土壤含水量 Soil moisture | 土壤全碳 Soil total carbon | 土壤全氮 Soil total nitrogen | 土壤全磷 Soil total phosphorus | 土壤速效磷 Soil available phosphorus | 土壤有效氮 Soil available nitrogen |
---|---|---|---|---|---|---|---|
根直径 Root diameter | -0.604** | -0.299 | -0.618** | -0.669** | -0.494* | -0.347 | -0.146 |
比表面积 Specific surface area | 0.570** | 0.432 | 0.499* | 0.487* | 0.385 | 0.439 | -0.102 |
比根长 Specific root length | 0.522* | 0.406 | 0.517* | 0.539* | 0.405 | 0.453* | -0.015 |
组织密度 Root tissue density | 0.130 | -0.258 | -0.029 | 0.111 | -0.044 | -0.210 | 0.237 |
根全碳 Root total carbon | 0.295 | 0.168 | 0.465* | 0.549* | 0.459* | 0.405 | 0.459* |
根全氮 Root total nitrogen | 0.385 | 0.102 | 0.517* | 0.604** | 0.532* | 0.459* | 0.272 |
根全磷 Root total phosphorus | 0.360 | 0.543* | 0.544* | 0.353 | 0.161 | 0.062 | 0.250 |
可溶性糖 Soluble sugar | -0.211 | -0.155 | -0.453* | -0.558* | -0.258 | -0.531* | -0.337 |
淀粉 Starch | -0.150 | -0.060 | -0.174 | -0.089 | -0.372 | -0.215 | 0.036 |
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