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应用格局指数、聚集强度指数和集聚均数,研究了哈溪林区夏季封育和冬季封育草类-青海云杉林优势种群空间格局的差异和形成原因。结果表明:青海云杉种群格局整体呈聚集分布,不同封育季节种群格局对放牧干扰有不同的反应,夏季放牧对不同龄级种群格局的影响远比冬季放牧时的大;造成夏季封育和冬季封育草类-青海云杉林不同龄级种群分布格局差异的主要原因是不同季节放牧干扰所致。
The spatial pattern of dominant species of Picea crassifolia and Picea crassifolia in summer seasons and the enclosed herbage in Haxi forest area were studied by using the pattern index, aggregation intensity index and clustering mean. The results showed that the population pattern of Picea crassifolia was aggregated and distributed, and the population pattern of different fencing season had different responses to grazing disturbance. The effect of summer grazing on the population structure of different age groups was greater than that during winter grazing. The main reason for the differences in distribution pattern of winter-grazed grass-Picea crassifolia populations in different age groups was the grazing disturbance in different seasons.