摘要
为揭示干热河谷次生稀树灌木林种群现状、分布状况及发展动态规律,以四川攀枝花苏铁国家级自然保护区内1 hm;永久固定样地为研究对象,对样地内所有种群植株个体进行每木调查,以重要值分析群落优势种群组成,并运用O-ring统计对样地内攀枝花苏铁种群空间格局及种间关联性进行计算。结果表明:干热河谷次生稀树灌木林群落除攀枝花苏铁为灌木生长型外,其余优势物种皆为乔木或小乔木型。6个优势种群空间分布格局均以随机分布为主,聚集分布次之,均匀分布尺度占比最小。种群优势度随聚集规模增大而增大,二者线性正相关,回归方程为:y=(127.49±9.04)x+(4.78±1.88)(Adj-R^(2)=0.98,P=1.46993E-4 <0.01)。种间关联尺度占比以无关联最大,负相关次之,正相关最小。群落中种群聚集规模决定种群在群落中的优势程度,也是改变当前群落种群优势地位的主要驱动力。滇榄仁种群主要生存压力源于攀枝花苏铁和蒙桑种群,也极易受群落环境影响。铁橡栎和滇榄仁种群与蒙桑种群的种间竞争是其两次种内密度调节的主要原因。
In order to understand spatial pattern and interspecific association of dominant populations in secondary savanna shrub forest in dry-hot valley, a 1 hm~2 permanent sample plot was established in Panzhihua Cycas panzhihuaensis National Nature Reserve. The individual plants of all populations in the sample plot were investigated per tree, the dominant population composition of the community was analyzed by the important values, and the spatial pattern, interspecific association, and relationships of aggregation scale and dominance of dominant populations in community were executed by using function O-ring and software SPSS. The results showed that the dominant species in the secondary savanna shrub forest in dry-hot valleys were trees or small trees except Cycas panzhihuaensis. The spatial distribution pattern of the six dominant populations was all random distribution, which was followed by aggregation distribution, and the proportion of uniform distribution scale was the smallest. The dominance of population increased with the increase of aggregation scale, and there was a positive linear correlation between them. The regression equation was y =(127.49 ± 9.04)x +(4.78 ± 1.88)(Adj-R^(2) = 0.98,P = 1.46993E-4 < 0.01). The proportion of interspecific correlation scale was the largest in non-correlation, followed by negative correlation and the smallest in positive correlation. The dominance of populations in community was determined by aggregation scale, which was also the main driving force to change dominant position of populations in community. The main survival pressure of Terminalia franchetii was from C. panzhihuaensis and Morus mongolica, which was also easily affected by community environment. The main reason for regulating twice of intraspecific density was interspecific competition from Quercus cocciferoides and M. mongolica, as well as T. franchetii and M. mongolica.
作者
龙成
余志祥
杨永琼
税梅梅
LONG Cheng;YU Zhixiang;YANG Yongqiong;SHUI Meimei(Panzhihua University,Panzhihua 617000,China;Panzhihua Cycas panzhihuaensis National Nature Reserve,Panzhihua 617000,China;Panzhihua Construction Engineering School,Panzhihua 617000,China)
出处
《四川林业科技》
2022年第3期44-52,共9页
Journal of Sichuan Forestry Science and Technology
基金
四川省重点实验室项目(JDC-2019-C-05)
攀枝花市科技创新项目(2018CY-S-33)
攀枝花学院校级项目(2020YB028)。
关键词
优势种群
空间格局
种间关联
干热河谷次生稀树灌木林
四川攀枝花苏铁国家级自然保护区
Dominant population
Spatial pattern
Interspecific association
Secondary savanna shrub forest in dry-hot valley
Panzhihua Cycas panzhihuaensis National Nature Reserve
