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-  2006 

祁连山中部祁连圆柏生长与更新方式的树轮记录

DOI: 10.11821/yj2006010007

Keywords: 祁连山,祁连圆柏,树轮生态学,生长释放,年龄结构

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Abstract:

摘要: 选择祁连山中部50m×15m的祁连圆柏样方进行树轮生态学取样与分析。分析结果表明,样方内大部分祁连圆柏的树龄小于250年,最近几年有大量幼苗萌生。祁连圆柏的径生长方式各有异同,大部分祁连圆柏在生长过程中出现1次以上生长释放事件,19701980年间出现生长释放的频率最高,占总释放次数的35%,轮宽年表也显示祁连圆柏的轮宽指数自1970s以来持续上升。另外,相关分析结果表明,温度是影响采样点区域祁连圆柏径向生长的主要环境因子,较高的温度有利于树木生长,6、7月份的降水也与树木径向生长呈显著正相关。在全球变暖的背景下,如果能积极开展植树造林,并有效控制人类活动的干扰,该区域祁连圆柏林更新状况将会显著改观

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