摘要
青海云杉(Picea crassifolia)是宁夏罗山国家级自然保护区森林建群树种之一,具有重要的生态价值。采用空间点格局的方法对罗山青海云杉4601株成活以及死亡的幼苗/幼树/大树的更新空间格局进行分析,研究幼苗/幼树与大树间的关联性。结果表明:①青海云杉成活植株表现为高度变异,成活植株占比从55.31%到87.68%逐步上升,为增长型种群。②青海云杉成活幼苗、成活幼树分别在0~18.3 m、21.5~24.4 m和0~7.6 m、9.5~17.5 m的尺度上空间格局为聚集分布;随着空间尺度的增加,趋向于随机分布、均匀分布。③总体成活植株与总体死亡植株在0~16.2 m的尺度上为正相关,在16.2~31.1 m的尺度上为无关联,在31.1~40.0 m的尺度上为负相关;各成活树木龄级植株间均表现为无关联。④死亡幼苗与成活幼树、死亡幼树与成活大树分别在0~6.9 m、0~6.6 m空间尺度上为正相关,随着空间尺度的增加,空间关联性表现为从正相关到无关联或弱负相关。研究表明,宁夏中部干旱带青海云杉种群受种内竞争及有限资源和空间的影响,幼苗生长为大树的量极少,林上层林冠对空间的竞争影响了幼苗与幼树的更新。
Picea crassifolia is one of the main tree species in the Luoshan National Nature Reserve in the middle arid zone of Ningxia,and has great ecological value.The spatial point pattern method was used to analyze the renewal spatial pattern of 4601 living and dead seedlings/saplings/large trees of Picea crassifolia in Luoshan Mountain,and the correlation between seedlings/saplings and large trees was investigated.The results show that①the living Picea crassifolia show a high degree of variability,and the proportion increases gradually from 55.31%to 87.68%,which is a growth population.②The spatial pattern of living seedlings and saplings at the scales of 0~18.3 m,21.5~24.4 m and 0~7.6 m,9.5-17.5 m,respectively,shows an aggregated distribution.With the increase of spatial scales,it tends to be randomly distributed and uniformly distributed.③Total living plants and total dead plants are positively correlated on the scale of 0~16.2 m,unrelated on the scale of 16.2~31.1 m,and negatively correlated on the scale of 31.1~40.0 m.The living plants of different ages show no correlation with each other.④Dead seedlings are positively correlated with living saplings at the spatial scales of 0~6.9 m,and dead saplings are positively correlated with living large trees at the spatial scales of 0~6.6 m.With the increase of spatial scale,the spatial correlation changes from positive to no or slightly negative.The research indicates that the population of Picea crassifolia in the central arid zone of Ningxia is affected by intraspecific competition and limited resources and space,the amount of seedlings growing into large trees is small,and the competition for space in the upper canopy of the forest affect the renewal of seedlings and saplings.
作者
王广平
李成
王书砚
刘超
杨君珑
Wang Guangping;Li Cheng;Wang Shuyan;Liu Chao;Yang Junlong(School of Agriculture,Ningxia University,Yinchuan 750021,China;Ningxia Luoshan National Nature Reserve Administration,Wuzhong 751100,China)
出处
《农业科学研究》
2023年第3期10-15,23,共7页
Journal of Agricultural Sciences
基金
宁夏重点研发项目“罗山国家级自然保护区生态修复与功能提升关键技术研究与示范”(2021BEG02009)。
关键词
罗山自然保护区
青海云杉
空间点格局分析
空间关联性
Luoshan National Nature Reserve
Picea crassifolia
spatial point pattern analysis
spatial correlation
