干旱胁迫下江南油杉幼苗生长与耗水特性

doi:10.19692/j.issn.1006-1126.20240105

广西林业科学 ›› 2024, Vol. 53 ›› Issue (1): 33-41.DOI: 10.19692/j.issn.1006-1126.20240105

干旱胁迫下江南油杉幼苗生长与耗水特性

庞艳萍¹, 刘菲², 潘淑民¹, 姜英², 刘雄盛², 王凌晖¹, 蒋燚²

1.广西大学林学院,广西南宁 530004;
2.广西壮族自治区林业科学研究院广西优良用材林资源培育重点实验室中南速生材繁育国家林业和草原局重点实验室,广西南宁 530002

收稿日期:2023-12-10 出版日期:2024-02-29 发布日期:2024-03-07
通讯作者: 王凌晖（1965 — ）,男,博士,教授,主要从事园林植物栽培研究;蒋燚（1968 — ）,男,博士,教授级高级工程师,主要从事森林培育与森林经营研究。
作者简介:庞艳萍（1996 — ），女，硕士研究生，主要从事园林植物栽培与园地养护管理研究；刘　菲（1989 — ），男，硕士，高级工程师，主要从事森林培育、森林经营与植物抗逆生理研究。
基金资助:
广西自然科学基金项目（2018GXNSFBA294012）; 中央财政林业科技推广示范项目（[2021]TG19号）

Growths and Water Consumption Characteristics of Keteleeria fortunei var. cyclolepis Seedlings under Drought Stress

Pang Yanping¹, Liu Fei², Pan Shumin¹, Jiang Ying², Liu Xiongsheng², Wang Linghui¹, Jiang Yi²

1. College of Forestry, Guangxi University, Nanning, Guangxi 530004, China;
2. Guangxi Forestry Research Institute, Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation, Key Laboratory of National Forestry and Grassland Administration on Cultivation of Fast-Growing Timber in Central South China, Nanning, Guangxi 530002, China

Received:2023-12-10 Online:2024-02-29 Published:2024-03-07

摘要/Abstract

摘要： 为探究干旱胁迫下江南油杉（Keteleeria fortunei var. cyclolepis）幼苗生长与耗水特性,为江南油杉苗期水分管理、干旱修复技术探索提供理论依据,以2年生江南油杉幼苗为材料,采用盆栽控水法,设置适宜水分（CK）及轻度（T1）、中度（T2）和重度（T3）干旱4种处理,分别为田间最大持水量的75％~80％、55％~60％、35％~40％和15％~20％,研究不同干旱程度下江南油杉幼苗生长变化和耗水特性。结果表明,30~40天时,苗高生长随干旱程度加深呈下降趋势,轻度干旱处理的地径生长表现最好,且其地径增长率显著高于其他处理;轻度干旱处理有利于茎和根生物量的积累。30~40天时,根冠比随干旱程度加深呈上升趋势。平均日耗水量和周耗水量及总耗水量均随干旱程度加深呈下降趋势。轻度干旱处理的日耗水量在胁迫后期达到最高值,之后与中度和重度干旱处理的日耗水量相近,均处于较低水平;轻度干旱环境下,江南油杉幼苗对土壤水分的利用效率较高,说明江南油杉幼苗有一定耐旱能力。综合考虑苗木生长和耗水特性,将土壤水分含量控制在田间最大持水量的55％~60％能保持江南油杉幼苗正常的生长发育,并有利于茎和根生物量的积累,还能实现土壤水分高效利用,达到节水育苗和旱地生态修复的目标。

关键词: 干旱胁迫, 苗木生长, 耗水特性, 江南油杉

Abstract: In order to investigate growths and water consumption characteristics of Keteleeria fortunei var. cyclolepis seedlings under drought stress, and provide theoretical basis for water management of K. fortunei var. cyclolepis at seedling stage and exploration of drought restoration technology, taking 2-year-old K. fortunei var. cyclolepis seedlings as materials, appropriate water (CK) and mild (T1), moderate (T2) and severe (T3) drought treatments by potted water control method were set, with 75%-80%, 55%-60%, 35%-40% and 15%-20% of maximum field capacity respectively. Growth changes and water consumption characteristics of K. fortunei var. cyclolepis seedlings under different drought degrees were studied. Results showed that growth of seedling height decreased with deepening of drought degrees from 30 to 40 days. Under mild drought treatment, growth of ground diameter was the best from 30 to 40 days, and growth rate of ground diameter was significantly higher than those of other treatments. Mild drought treatment was beneficial to accumulations of stem and root biomass. From 30 to 40 days, root-shoot ratio increased with deepening of drought degrees. Average daily and weekly water consumptions and total water consumption decreased with deepening of drought degrees. Under mild drought treatment, daily water consumption reached the highest at later stage of stress, and after the highest value, daily water consumptions were similar to daily water consumptions under moderate and severe drought treatments, which were at lower levels. Under mild drought environment, K. fortunei var. cyclolepis seedlings had highly efficient utilization for soil moisture, which indicated that K. fortunei var. cyclolepis seedlings had certain drought tolerance ability. Considering growths and water consumption characteristics of seedlings, controlling soil moisture content at 55%-60% of maximum field capacity could maintain normal growths of K. fortunei var. cyclolepis seedlings, facilitate accumulations of stem and root biomass, realize highly efficient utilization for soil moisture, and achieve goal of water-saving seedling and dry land ecological restoration.

Key words: drought stress, seedling growth, water consumption characteristic, Keteleeria fortunei var. cyclolepis

中图分类号:

S718.5

庞艳萍, 刘菲, 潘淑民, 姜英, 刘雄盛, 王凌晖, 蒋燚. 干旱胁迫下江南油杉幼苗生长与耗水特性[J]. 广西林业科学, 2024, 53(1): 33-41.

Pang Yanping, Liu Fei, Pan Shumin, Jiang Ying, Liu Xiongsheng, Wang Linghui, Jiang Yi. Growths and Water Consumption Characteristics of Keteleeria fortunei var. cyclolepis Seedlings under Drought Stress[J]. GUANGXI FORESTRY SCIENCE, 2024, 53(1): 33-41.

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干旱胁迫下江南油杉幼苗生长与耗水特性

Growths and Water Consumption Characteristics of Keteleeria fortunei var. cyclolepis Seedlings under Drought Stress

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