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Research on Stand Structure of Robinia Pseudoacacia in Weibei Loess Plateau

Author: NiJing
Tutor: SongXiDe
School: Northwest University of Science and Technology
Course: Forest cultivation
Keywords: Locust plantation Stand structure Spatial distribution pattern Spatial structure parameters
CLC: S718.5
Type: Master's thesis
Year: 2010
Downloads: 62
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Abstract


The stand structure stand function and performance, with reference importance of forest management and health evaluation. BLACK LOCUST PLANTATIONS stand diameter structure and distribution pattern of tree height each wood 33 standard ground-based survey data, systems analysis, and indexes of aggregation method and distance method analysis The spatial distribution pattern of the forest, and then based on the smallest structural unit DBH than the number, the size of the tree height than the number of angle scale spatial structure parameters specific analysis of the spatial structure of the locust. The results show that: (1) locust plantations diameter distribution in compliance with the approximate normal distribution, the greater stand density, the greater diameter left partial, trail-order trees the more; forest age greater the skewness of the distribution curve and the smaller the kurtosis; less than the sunny shady slope normal distribution curve skewness, kurtosis is greater than the sunny. Tree height distribution and the diameter distribution law is substantially the same height in the middle of the tree distribution up at both ends of the number of trees gradually reduced, the trail order the number of trees is slightly more than the diameter class. Larger the diameter at breast height of locust trees higher, there is a positive correlation between tree height and diameter at breast height. Height distribution is better known by the X2 test, the normal distribution function fitting diameter structure and locust tree. The aggregate indices analysis (2) The the locust trees space age class distribution pattern, the results showed that: Locust young forest, middle-aged forest and mature forest aggregated distribution; near mature forest and mature forest evenly distributed. The application from the analysis conclusions stand spatial distribution of the outcome of the results of the aggregate indices obtained slightly different. (3) in the reference tree and the four nearest neighbors wood composed of a minimum structural unit, the structural unit of the average distance scale as a single-peak distribution. (4) on the basis of the minimum structural unit, the number of tree height than in growth advantage reflects the reference tree and the adjacent wood and DBH than the number of strong consistency. Can be drawn based on the angle scale criteria: locust young forest, middle-aged forest near mature forest to gather distribution and uniform distribution of mature forest and mature forest and mature forest random distribution. In addition, the study to sample ground 1 as an example, choose the basic principles of harvesting wood stand analog harvesting and cutting stand spatial structure analysis. The results show that, the felling trees tends random distribution, this distribution pattern of adjustment forest level, improve forest competition between some of the theoretical and practical significance.

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CLC: > Agricultural Sciences > Forestry > Forestry basic science > Forest Biology > Forest Ecology
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