摘要
为探讨川西亚高山针叶林的林窗干扰特征 ,对王朗自然保护区的这一植被类型进行了调查 ,分析了该类型森林中林窗的数量、大小、形状及其成因 ;林窗形成木 (GM )的类型、数量和物种构成。结果表明 ,在川西亚高山原始针叶林林区 ,大多数形成木都是因树木达到一定年龄后衰老等原因引起其抗性下降而死亡的 ;由树木基折形成的林窗最为普遍 ,占 5 1 2 3% ,由干折形成的占 2 0 37% ;单株形成木林窗几乎达到所调查林窗的一半 (占总数的 4 6 99% ) ,平均每个林窗拥有 1 95株形成木。扩展林窗大小多在 10 0～ 4 0 0m2 ,10 0～ 2 0 0m2 所占的数量比例最大 ,占 2 6 5 1% ;而 30 0～ 4 0 0m2 所占的面积比例则最大 ,占 2 2 6 4 %。冠空隙的面积多在 2 0 0m2 以下 ,其中以 5 0～ 10 0m2 所占的数量比例和面积比例均为最大 ,分别为 32 5 3%、17 72 %。冠空隙、扩展林窗的平均面积为 71 6 8m2 、15 4 14m2 。
In order to explore the characteristics of gap disturbance in subalpine primary coniferous forests in western Sichuan Province,the gaps in the primary coniferous forest at Dawodang in Wanglang Nature Reserve were surveyed and analyzed according to the quantity,size,type and factors of gap formation,the type,number,species composition of gap maker (GM).The results showed that most gap makers died due to their aging and the descending capabilities of counteracting disadvantageous surroundings.The most popular manner of gap formation in the forest was breakage at the base of gap makers (51.23% of the total).The second was breakage on trunk (20.37%).Almost half of the gaps were formed by one tree(46 99% of the total), with an average of 1 95 trees per gap.The size of most expanded gaps was in the range of 100～300?m 2,the gaps of 100～200?m 2 occupied the highest percentage in number (26 51% of the total),while those of 300～400?m 2 occupied the highest percentage in size (22 64% of the total).The size of most canopy gaps was under 200?m 2,the gaps of 50～100?m 2 occupied the highest percentage in number and size (32 53% and 17 72% of the total).The average areas of canopy gap and expanded gap were 71 68?m 2 and 154 14?m 2,respectively.
出处
《生态学杂志》
CAS
CSCD
北大核心
2004年第3期6-10,共5页
Chinese Journal of Ecology
基金
国家自然科学基金重大项目 ( 90 2 0 2 0 10 )
中国科学院"百人计划"项目 (B0 10 10 8)资助
关键词
川西亚高山
针叶林
林窗特征
subalpine in western Sichuan,coniferous forest,characteristics of gap.
