巨柏苗木对干旱胁迫的生长响应  

Growth Response of Cupressus Gigantea Seedlings to Drought Stress

作　　者：何宇静 高智远 张露 杨小林[2] HE YuJing;GAO Zhiyuan;ZHANG Lu;YANG Xiaolin(POWERCHINA Chengdu Engineering Corporation Limited,Chengdu Sichuan,611130,China;Resources&Environment College,Xizang Agriculture&Animal Husbandry University,Linzhi Xizang,860000,China)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,四川成都611130 [2]西藏农牧学院资源与环境学院,西藏林芝860000

出　　处：《高原农业》2024年第5期490-495,共6页Journal of Plateau Agriculture

基　　金：“西藏高原林业生态工程重点实验室”资助。

摘　　要：为探索巨柏苗木对干旱胁迫的响应,本文以1 a生巨柏容器苗为试验材料进行了干旱胁迫试验,研究了不同水分梯度(5水分梯度)对巨柏苗木生长指标和存活状况的影响。结果表明:干旱胁迫对巨柏苗高、地径和根系生长均有显著影响。连续干旱导致巨柏苗高、地径、总根长、须根数及地上部分干物质增长量逐渐减少,但随着胁迫强度的增加,高径比下降,根冠比上升,生物量的分配趋势向地下部分转移,均表现出了巨柏苗木抗旱性;胁迫强度与存活状况和存活时间负相关,≥50%的田间持水量可满足1 a生巨柏苗木成活且日均需水量不低于20.24 g,极重干旱胁迫的苗木平均仅能存活35 d。In order to explore the response of Cupressus gigantea seedlings to drought stress,this paper used 1a Cupressus gigantea container seedlings as the experimental material to carry out drought stress experiments,and the effects of different water gradients(5 water gradients)on the growth index and survival status of Cupressus gigantea seedlings were studied.The results showed that drought stress had significant effects on seedling height,ground diameter and root growth.Continuous drought led to a gradual decrease in the height,ground diameter,total root length,number of whisker roots and dry mass growth of the aboveground part of the Cupressus gigantea seedlings,but with the increase of stress intensity,the high diameter ratio decreased,the root~to~body ratio increased,and the distribution trend of biomass shifted to the underground part,all of which showed the drought resistance of Cupressus gigantea seedlings.The stress intensity was negatively correlated with the survival status and survival time,and≥50%of the field water holding capacity could meet the survival of 1a Cupressus gigantea seedlings and the average daily water demand was not less than 20.24g,and the average survival of seedlings under severe drought stress was only 35 days.

关 键 词：巨柏苗木 水分梯度 生长指标 

分 类 号：S722.3[农业科学—林木遗传育种]