干旱和坡向互作对栓皮栎和侧柏生长的影响

被引:52
作者
王林 [1 ]
冯锦霞 [1 ]
王双霞 [2 ]
贾长荣 [3 ]
万贤崇 [1 ]
机构
[1] 中国林业科学研究院新技术所
[2] 河南省济源市气象局
[3] 济源市国有大沟河林场
关键词
栓皮栎; 侧柏; 坡向; 年轮宽度; δ13C值;
D O I
暂无
中图分类号
S791.38 [侧柏]; S792.18 [栎];
学科分类号
090702 [森林培育]; 090708 [林木遗传育种学];
摘要
用年轮学方法测定了不同坡向的栓皮栎和侧柏的年轮宽度及相应的年树干面积增长量,同时测定了旱季碳稳定同位素比值(δ13C)及不同坡向之间的微气象指标差异,分析了不同坡向两种树木径向生长与旱季降雨量的关系,目的是探索在华北石质山区季节性干旱条件下坡向对栓皮栎和侧柏生长的影响。结果显示阴坡栓皮栎和侧柏年轮和年增加的截面积显著大于阳坡,两个树种都表现出阳坡δ13C值显著(P<0.05)大于阴坡,阳坡栓皮栎δ13C值比阴坡高1.17,而阳坡侧柏的δ13C值比阴坡高0.56。白天,阳坡气温高于阴坡、相对湿度低于阴坡、饱和蒸汽压匮缺高于阴坡。分析显示旱季降雨量和栓皮栎的树干截面积年增长量显著(P<0.05)相关,而旱季的降雨量和侧柏的截面积年生长没有显著关系。结果表明:相对于侧柏,干旱条件更严重的影响到栓皮栎生长和叶片水分利用效率,反映出这两种树木耐旱能力的差异,以及应对干旱策略的不同。华北石质山区的土壤储水能力低,阳坡较大的蒸散加剧了干旱对树木生长的不利影响。
引用
收藏
页码:2425 / 2433
页数:9
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