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- Title
新疆天山峡谷不同坡向野核桃种群分布格局.
- Authors
张维; 李海燕; 赖晓辉; 杨允菲
- Abstract
Eight 4000 m² 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 (Cx), negative binomial parameter (K), clumping index (I), mean crowding index (m*), patchiness index (PAI) and aggregation index (Ca) 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 m². 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 m². When scale was 25 m², 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 m², saplings, young and mature trees showed random distribution. The pattern size of J. cathayensis populations was 25 m² and pattern intensity was 2.49-9.38 m². 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.
- Publication
Yingyong Shengtai Xuebao, 2016, Vol 27, Issue 10, p3105
- ISSN
1001-9332
- Publication type
Article
- DOI
10.13287/j.1001-9332.201610.004