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华北土石山区天然次生林枯立木数量特征与分布格局
安云1,2, 丁国栋1,2, 高广磊1,2, 梁文俊1,2, 贺宇1,2, 魏宝1,2, 鲍彪1,2
1.水土保持与荒漠化防治教育部重点实验室,北京 100083;2.北京林业大学水土保持学院,北京 100083
摘要:
枯立木广泛存在于森林生态系统中,对森林的发展与演替有着十分重要的影响.以河北省木兰围场国有林场北沟林场天然次生林(面积为4hm2)植被群落调查为基础,分析研究了华北土石山区天然次生林枯立木树种组成、径级结构、生物量和分布格局.研究结果显示,研究区天然次生林枯立木分属8个乔木种群,密度为79.25株/hm2,占全部乔木的10.13%;枯立木生物量为18.46t/hm2,占全部乔木生物量的6.88%;山杨枯立木数量和生物量分别占全部枯立木的83.60%和90.58%,是样地中枯立木数量和生物量最大的树种;枯立木胸径(DBH)分配以DBH<22cm为主;林分内所有枯立木的平均角尺度值为0.543,呈随机分布.
关键词:  枯立木  树种组成  径级结构  生物量  分布格局
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基金项目:国家林业局公益性行业科研项目“典型区域森林生态系统健康维护与经营技术研究”(200804022A)
Quantity Characteristics and Distribution Pattern of Standing Dead Trees in Natural Secondary Forests of Rocky Mountain Area in Northern China
AN Yun1,2, DING Guo-dong1,2, GAO Guang-lei1,2, LIANG Wen-jun1,2, HE Yu1,2, WEI Bao1,2, BAO Biao1,2
1.Key Laboratory of Soil and Water Conservation and Combating Desertification, Ministry of Education, Beijing 100083, China;2.College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
Abstract:
Standing dead trees(SDT) are widespread in forest ecosystems and have a particular important in-fluence on forest development and succession. Based on vegetation community survey in plots of 4 hm2 in Mulan-Weichang forest farm of Hebei Province, this study analyzed the species, diameter structure, bio-mass and distribution pattern of SDT in the rocky mountain area of Northern China. The results indicate that the SDT involved eight species. The density of the SDT was 79.25 stems/hm2 , accounting for 10.13% of to-tal tree numbers in the plots. The biomass of the SDT was 18.46 t/hm2 , accounting for 6.88% of the total biomass in the plots. Among them, both the number and the biomass of Populus were the greatest, account-ing for 83.60% and 90.58% of all the SDT, respectively. The diameter at breast height(DBH) of the major-ity of the SDT was smaller than 22 cm. The average uniform angle index of all the SDT of the forest is 0. 543, indicating a random distribution pattern.
Key words:  standing dead trees  species composition  diameter structure  biomass,distribution pattern