天宝岩自然保护区长苞铁杉不同群落结构与空间格局比较  

Comparative Study on Structure and Special Pattern of Different Tsuga longibracteata Communities in Tianbaoyan National Nature Reserve

作　　者：严绍裕[1] 

机构地区：[1]福建林业职业技术学院,福建南平353000

出　　处：《西南林业大学学报（自然科学）》2013年第4期44-48,共5页Journal of Southwest Forestry University：Natural Sciences

摘　　要：用群落数量统计学方法对永安天宝岩国家级自然保护区长苞铁杉纯林、长苞铁杉猴头杜鹃混交林和长苞铁杉青冈混交林的群落结构及空间格局进行比较,结果表明:随着径级数的增大,长苞铁杉纯林和长苞铁杉青冈混交林个体数量分布呈持续减少趋势,分享度持续下降;长苞铁杉猴头杜鹃混交林个体数量随径级数增大呈现先增加后下降再增加再下降的双峰结构,分享度先增加后减少再增加再下降;3种群落乔木层高度级分布趋势相似,随着高度级增加基本呈现先增后减的双峰结构,均在Ⅳ级达到最大值,长苞铁杉纯林的分享度呈现先增后减再增再减的双峰结构,长苞铁杉青冈混交林和长苞铁杉猴头杜鹃混交林呈先增加后减少的单峰结构;长苞铁杉纯林种群空间格局在10 m×10 m、10 m×20 m和20 m×30 m 3种尺度下主要为聚集分布,但随着取样尺度的增加,长苞铁杉种群在纯林中呈现分散趋势。The community structure and spatial pattern of the Tsuga longibracteata pure forest, the forest of Tsuga longibrceata mixed with Rhododendron sp. , the forest of Tsuga longibracteata mixed with Cryptomeria fortu- nei from Yong＇an Tianbaoyan National Nature Reserve were studied by means of the Community Mathematics and Applied Statistics methods. The results showed that the number of individuals together with the share rate in the Tsuga longibracteata pure forest and the Tsug alongibracteata - Cryptomeriafortunei mixed forest were reduced con- tinuously along with the DBH increase; while the number of individuals together with the share rate in the Tsuga longibracteata - Cryptomeria fortunei mixed forest changed with a double-peak form, i. e. , in up - down - up - down curve along with the increase of DBH scale. The height-scale distribution of the arbor tree layer in the three communities was similar. The share rate of the forest also changed with a double-peak form, i. e. , in up - down - up - down curve along with the increase of tree height, which reached to the largest value at IV height class. The share rate of Tsuga longibraeteata pure forest changed in a double-peak form, but it changed in a single-peak form in the Tsuga longibracteata - Cryptorneria fortunei mixed forest and in the Tsuga longibracteata - Rhododendron sp. Mixed forest. The spatial distribution pattern of Tsuga longibracteata population in the pure forest under 10 m× 10 m, 10 m × 20 m and 10 m × 30 m scales all showed the increased, the Tsuga longibracteata population in the p aggregated distribution pattern. But with the sampling scale ure forest showed the scattered distribution pattern.

关 键 词：长苞铁杉 群落生态学 数量特征 空间格局 天宝岩国家级自然保护区 

分 类 号：S718.5[农业科学—林学]