摘要
干旱是主要的环境胁迫因子之一,严重影响植物的分布与生长发育。通过选用辽宁阜新章古台沙地1年生杨树幼苗为材料,采用盆栽控水方法研究了不同土壤水分处理对幼苗生长状况、生物量分配、叶面积、组织器官含水量及水分利用效率等指标的影响。结果表明:干旱胁迫抑制了杨树幼苗株高和基径的生长,降低了叶片和茎生物量的积累,然而却增加了根系生物量,杨树将更多的碳水化合物分配到地下部分,导致其单位质量的根系更长,有利于其吸收水资源;同时轻度胁迫下,杨树幼苗增加了茎和根系的含水量,提高了水分利用效率;在科尔沁沙地,栽植杨树幼苗保证生长存活的最低土壤含水量为10.72%。
Drought is one of the major environmental stress factors, seriously affecting the distribution of plant growth and development. Taking 1 year old poplar seedlings in Zhanggutai Sandyland of Fuxin City in Liaoning Province as materials, adopting method of water controled in pot, the effects of different soil moisture treatments on seedling growth status, biomass partitioning,leaf area, water content on tissues and organs and water use efficiency were studied. Result shows that drought stress suppress growth of seedling height and basal diameter of poplar, re duce the accumulation of leaves and stem biomass;drought stress increase root biomass;poplar will allocate more carbohydrates to the underground part, resulting in longer roots per unit mass; it is beneficial for poplar to absorb water. While under mild stress, seedlings of poplar increase the water content of stem and roots, improve water use efficiency; in Horqin sandy land, the lowest moisture content of soil which can ensure the growth and survival for seedlings of poplar is 10.72%.
出处
《防护林科技》
2016年第6期8-11,共4页
Protection Forest Science and Technology
基金
基金项目:辽西北低质低效林改造技术研究与示范
关键词
干旱胁迫
抗旱性
杨树
科尔沁沙地
drought stress
drought resistance
poplar
Horqin sandy land
