To determine water stress is the key factor influencing the Populus euphratica seedling growth and survival rate,and seedling response to moisture.We took Populus euphratica seeds as study material to study Populus euphratica seedling root growth characteristics for different relative water content by the soil pot method.The results showed that Populus euphratica seedling root surface area decreased with decreasing of soil moisture,and the seedling root surface area by intermittent treatment was slightly larger than the treatment given by continuous treatment when the water content was in the same conditions.The seedling root biomass by intermittent treatment was significantly less than the seedlings under continuous treatment,and the minimum root biomass occurred when soil water content was only 5%.It evidenced that the state of drought stress influences seedling root biomass accumulation.Root length of continuous water treatment was greater than the length of the intermittent treatment in the moisture gradient,but the root width to depth ratio was less than that of the seedling by intermittent treatment.The lateral branching angle of seedlings by intermittent treatment was greater than that of the continuous ones.This study verified the water stress was the key factor influencing Populus euphratica’s seedling growth.And the seedlings can change the expansion direction and the accumulation of biomass to adapt to the state of drought stress.
BAI Haixia
,
ZHANG Ronghua
,
ZHANG Xianhui
,
WANG Long
,
Lü Shuang
,
LI Jingwen
. Populus euphratica Seedling Root Growth Characteristics under Different Water Treatment[J]. Forest and Grassland Resources Research, 2015
, 0(5)
: 61
-66
.
DOI: 10.13466/j.cnki.lyzygl.2015.05.011
[1]高润宏,董智,张昊,等.额济纳绿洲胡杨林更新及群落生物多样性动态[J].生态学报,2005,25(5):1020-1025.
[2]陈维强,周伟磊,刘倩雯,等.人为干扰对额济纳胡杨林群落组成及更新的影响[J].林业资源管理,2010(1):46-58.
[3]李军,张秋良,高润宏,等.额济纳绿洲胡杨种群结构与分布格局研究[J].干旱区资源与环境,2008,22(2):187-190.
[4]张昊,李景文,李俊清,等.额济纳绿洲胡杨地上部分建构模式的研究[J].西北林学院学报,2009(5):46-49.
[5]张玉波,李景文,张昊,等.额济纳胡杨有性繁殖失败因素分析[J].科学技术与工程,2005(8):467-472.
[6]张楠.土壤条件对胡杨幼苗生长的影响研究[D].北京:北京林业大学,2013.
[7]黄晶晶,井家林,曹德昌,等.不同林龄胡杨克隆繁殖根系分布特征及其构型[J].生态学报,2013(14):4331-4342.
[8]刘秀林,刘丽君.根系研究法概述[J].农业科技通讯,2013(3):147-149.
[9]岳龙,董凤祥,徐迎春.控根容器苗根系构型研究进展[J].世界林业研究,2008(6):31-35.
[10]张楠,杨雪芹,曹德昌,等.土壤水肥因子对胡杨幼苗生长权衡和木质化的影响[J].西北植物学报,2013(4):771-779.
[11]Fernandze R J,Wang M B,Reynolds J F.Do morphological changes mediate plant responses to water stress? Asteady-state experiment with two C4 grasses [J].New Phytologist,2002,155:79-88.
[12]Lynch J.Root Architecture and Plant Productivity[J].Plant Physiol,1995,109(1):7-13.
[13]杨小林,张希明,李义玲,等.塔克拉玛干沙漠腹地3种植物根系构型及其生境适应策略[J].植物生态学报,2008(6):1268-1276.
[14]江俐妮,魏红旭,刘 勇,等.长白落叶松播种苗根系形态可塑性与氮素空间异质性关系[J].东北林业大学学报,2010,38(1):24-27.
[15]单立山,张希明,花永辉,等.塔克拉玛干沙漠腹地梭梭幼苗根系分布特征对不同灌溉量的响应[J].植物生态学报,2007,31(5):769-776.
