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Population Structure and Spatial Point Pattern of Sophora moorcroftiana in Arid Sandy Land in the Middle Reaches of Yarlung Zangbo River,Tibet

Sophora moorcroftiana, which has a strong tolerance ability to blown sand and soil impoverishment and a potential value of sand fixation and soil conservation, is the constructive species of the arid valley vegetation community in middle reaches of the Yarlung Zangbo River. To explore the population structure, growth characteristics and spatial distribution pattern, size classes statistics and Ripley's K function are used to study the population structure and spatial pattern of S. moorcroftiana respectively. The results are as follows. (1) Majority of the S. moorcroftiana population are medium-size individuals because the survival rate of seedlings is low, in contrast, adverse resistance and survivability of medium-size individuals are powerful. (2) Successional process of S. moorcroftiana population follows an order: a few individuals invade-the population multiply-habitats are improved and population density increases to induce excessive competition-the population expand spatially and succession enters the climax phase. (3) The individuals of S. moorcroftiana of different size classes are all aggregated on a scale of 9 m. It is suggested that in breeding of S. moorcroftiana people should pay more attention to the seedlings with the crown width less than 20 cm or the height less than 13 cm and choose relatively superior habit to cultivate large population to boost survival rate, so as to make full use of its abilities of windbreak and sand-fixation.