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额济纳胡杨种群年龄结构与树干空心分布特征/Population age structure and cavity distribution characters of Populus euphratica in Ejina[J]
Authors
CHEN Zhong-sheng
HAO Xing-ming
+5 more
ZHAO Wan-yu
荒漠与绿洲生态国家重点实验室,中国科学院新疆生态与地理研究所,新疆乌鲁木齐830011
赵万羽
郝兴明
陈忠升
Publication date
1 January 2011
Publisher
Abstract
在黑河下游额济纳胡杨林自然保护区内的核心区与缓冲区分别设置了3个50 m×50 m的样地,对样地内每株胡杨进行调查获取野外数据,分析了核心区与缓冲区胡杨的种群结构、树干空心出现概率、发生规律及其与种群年龄结构的内在联系.结果表明:缓冲区胡杨径级主要集中于5 ~15级,以成熟和过熟林为主,种群处于衰退状态;核心区胡杨径级组要集中于1~5级,以青壮年胡杨为主,种群处于稳定增长状态.无论缓冲区还是核心区都出现了胡杨空心现象,但以缓冲区更为明显.当胡杨胸径<20 cm时,胡杨空心的出现概率为0.当胡杨胸径>75 cm时,空心出现概率则达到100%.胡杨径级介于4~15级时,空心出现概率与径级呈线性正比关系(R2 =0.57),且空心直径与胸径也表现为正比的关系(R2 =0.88).以上说明出现空心以后,胡杨胸径越大(年龄越大),其空心直径也越大,空穴化程度越明显.胡杨空心的形成可能和其存储大量水分与盐分有关,树干空穴化对胡杨生存并没有显著的不利影响
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Institutional Repository of Xinjiang Institute of Ecology and Geography, CAS
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Last time updated on 29/11/2016