摘要
以半湿润区、半干旱区和半干旱向干旱过渡区沙地上栽培的14~16年生樟子松人工林个体为研究材料,测定其主要耐旱生理指标(πjp、ε等)地区间的差异性,结果表明,樟子松主要的耐旱生理指标在不同地区间存在着显著差异(P≤0.05);其变化与各地区的气候湿度指标(Im)呈显著线性相关(P≤0.05),可用y=A+Bx关系式表达(y为耐旱生理指标;x为Im).当Im由-29.6降至-70.2时,嫩枝生长初期和年生长季末期,初始失膨点总体渗透势(πp)随Im的变化率(B)分别为0.0034MPa和0.0061MPa,最大总体体积弹性模数(ε)随Im的变化率(B)分别为0.017MPa和0.031MPa,从而证明樟子松是耐旱性可变树种,可通过干旱锻炼提高其耐旱性.
The drought-enduring physiological indexes(πp.ε,etc.)of Pinus.sylvestris var.mongolica are measured with 14~16 years old plantations on sandy lands in subhumid semiarid and transitional(from semiarid to arid)regions of inner Mongolia.The results show that thedrought-enduring indexes have a significant regional difference(P≤0.05),which is correlated with local climatic moisture index(Im),and can be expressed as Y=A+BX (Y,drought-enduring index;X,Im;and B,variation rate).When Im is varied from-29.6(Hailar) to -70.2(Huoluo),the variation rate(B)of bulk osmotic potential at initial turgor loss point (πp) is 0.0034 MPa at early stage of young branch growth and 0. 0061MPa at the last stage of yearly growth period.Similarly,the variation rate(B) of bulk elastic modulus (ε) with Im is 0.017 and 0.031 MPa,respectively.It is concluded that the drought-enduring property of Pinus .sylvestris var.,mangolica can be varied and improved by drought trainning.
出处
《应用生态学报》
CAS
CSCD
1996年第3期250-254,共5页
Chinese Journal of Applied Ecology
基金
国家自然科学基金
关键词
樟子松
耐旱生理特征
气候
湿度
Pinus sylvestris var.mongolica,Plantation,Drought-enduring characteristics,Climatic change.