塔里木河下游河水漫溢后胡杨幼苗分布格局初探  

Distribution Patterns of Populus euphratica Seedlings after River Overflowing in the Lower Reaches of Tarim River

作　　者：张青青[1,2] 徐海量[1] 安红燕[1,2] 傅荩仪[1,2] 

机构地区：[1]中国科学院新疆生态与地理研究所,荒漠与绿洲生态国家重点实验室,乌鲁木齐830011 [2]中国科学院研究生院,北京100049

出　　处：《西北植物学报》2011年第11期2298-2303,共6页Acta Botanica Boreali-Occidentalia Sinica

基　　金：国家自然科学基金项目(41101534,30970549,40971284);水利部公益性行业科研专项(201101049)

摘　　要：采用最近邻体法,将Clark-Evans指数作为度量胡杨幼苗分布格局的指标,并用标准正态分布检验实际CE指数值偏离1的显著性,分析塔里木河下游河水漫溢后胡杨幼苗的分布格局。结果表明:(1)在3m×3m的样方尺度上,河水漫溢后0～1年和1～2年的胡杨幼苗呈聚集分布,漫溢后2～3年的胡杨幼苗呈均匀分布,漫溢后4～5年和5～7年的胡杨幼苗呈随机分布。(2)在3m×3m的样方尺度上,随着胡杨幼苗年龄的增长,胡杨幼苗的空间分布格局由聚集分布转变为均匀分布,最终呈现为随机分布的格局。(3)在2m×2m至10m×10m的样方尺度上,漫溢后5～7年的胡杨幼苗空间分布格局均表现为随机分布。(4)标准正态分布检验结果显示,各个尺度上胡杨幼苗的CE值与理论值1之间的偏离均不显著,说明随着尺度的增大,胡杨幼苗的空间分布格局并没有发生显著变化,始终呈现出随机分布的格局。In order to analyzing the distribution patterns of Populus euphratica seedlings after river overflowing,Clark-Evans index was calculated for measuring the distribution patterns by using the nearest neighbor analysis method and tested the deviation of actual CE index from the 1 by using the standard normal distribution.The results indicated that：（1）In the quadrats of 3 m×3 m,seedlings of P.euphratica presented aggregated distribution after river overflowing for 0~1 year and 1~2 year,uniform distribution after river overflowing for 2~3 year,and random distribution after river overflowing for 4~5 year and 5~7 year.（2）With the increase of P.euphratica＇s age,the special distribution pattern of P.euphratica seedlings changed from aggregated distribution to uniform distribution and to random distribution finally in the quadrats of 3 m×3 m.（3）In the various sizes of quadrats of 2 m×2 m to 10 m×10 m,seedlings of P.euphratica presented random distribution after river overflowing for different years.And the test value of standard normal distribution show that the deviation of CE value of P.euphratica seedlings from 1 in the various sizes of quadrats were not significant.As the scale increase,the spatial distribution pattern of P.euphratica seedlings had no significant change,and they always presented random distribution pattern.

关 键 词：胡杨 幼苗 河水漫溢 空间分布格局 

分 类 号：Q948.154[生物学—植物学]