中文摘要：

在天山峡谷野核桃分布的4条沟谷的阳坡和阴坡设置8个4000 m^2样地,应用相邻格子法对野核桃每木调查,在不同尺度（面积）上采用方差/均值比率法和偏离指数（C_x）、负二项参数（K）、丛生指数（I）、平均拥挤度（m^＊）、聚块性指数（PAI）、聚集指数（C_a）等聚集强度指数对野核桃种群分布格局进行分析.结果表明：随尺度增大,野核桃种群由集群分布向随机分布过渡;在25 m^2尺度上,种群整体呈集群分布,但不同样地种群聚集强度存在较大差异,西沟阴坡种群聚集程度最大,南沟阴坡种群聚集程度最小;在50～400 m^2尺度上,种群整体呈随机分布.在25 m^2尺度上,幼树、小树和壮年树均呈集群分布,壮年树聚集强度最大,小树聚集强度最小;当取样尺度达到200～400 m^2时,幼树、小树、壮年树和大树均呈随机分布.野核桃种群格局规模为25 m^2,格局强度为2.49～9.38 m^2;种群组分中小树格局强度最大,壮年树格局强度最小.取样尺度与种群斑块大小接近,采用适合的测定方法并应用多指数综合判定,一般可获得可靠的结论.

英文摘要：

Eight 4000 m^2 plots were set up at eight sites distributed on sunny and shady slopes of four valleys,and adjacent lattice method was used to survey Juglans cathayensis populations.At different scales,aggregation intensity index such as variance/mean ration and deviation index（C_x）,negative binomial parameter（K）,clumping index（I）,mean crowding index（m^＊）,patchiness index（PAI） and aggregation index（C_a） were used to analyze distribution patterns of populations.With the increase of surveying scales,the distribution patterns changed from cluster to random.Populations presented a clustered distribution when the scale was 25 m^2.Aggregation intensity had great differences among different plots,and the maximum one located on west shady slope and the minimum one did on south shady slope.However,populations presented a random distribution when the scale was 50-400 m^2.When scale was 25 m^2,saplings,young and mature trees showed a clustered distribution.Aggregation intensity of mature trees was the maximum one and that of saplings was the minimum one.When the scale was 200-400 m^2,saplings,young and mature trees showed random distribution.The pattern size of J.cathayensis populations was 25 m^2 and pattern intensity was 2.49-9.38 m^2.The pattern intensity of young trees was the largest and that of mature trees was the least in population components.In a word,when sampling scale was close to population patch size,a reliable conclusion usually could be obtained by using adaptive determination method and multi-index comprehensive decision.