广西细叶云南松群系的初步研究

细叶云南松是云南松原种从中亚热带温凉的云南高原向东迁移,适应南亚热带于热河谷的一个变种。它广泛分布在南盘江下游两岸海拔300-1600米的丘陵山地,常常构成大面积的天然森林,群落类型多种多样。它们的形成和分布与所在地的气候、地貌、土壤和人为生产活动特别是垦殖和烧山的影响有密切的联系。本文比较详尽地划分和论述了这个区域广西范围内细叶云南松群系各个群丛的基本特点和分布规律,指出了它们的演替趋势和经营管理应采取的主要措施。

A PRELIMINARY STUDY OF PINUS YUNNANENSIS VAR.TENUIFOLIA FORMATION OF GUANGXI

Pinus yunnanensis var. tenuifolia Formation is extensively distributed in the hills and mountains with an altitude from 300-1600m. along the lower Nanpanjiang river. 11 plant associations have been found in this area. They are described as follows:1. Pinus yunnanensis var. tenuifolia-Quercus Yuii-Wend-landia uvarifolia subsp. dunniana-Microstegium vagans+Pogonatherum paniceum Association. 2. Pinus yunnanensis var. tenuifolia-Quercus variabilis-Quercus yuii-Miscanthus floridulus+Pogonathernm paniceumAssociation. 3. Pinus yunnanensis var. tenuifolia-Quercus fabri-Vacci-nium sprengelii-Arundinela nepalensis+Pogonatherum pani-ceum Association. 4. Pinus yunnanensis var. tenuifolia-Schima wallichii-Rhodomyrtus tomentosa-Dicranopteris dichotoma Association. 5. Pinus yunnanensis var. tenuifolia-Wendlandia uvarifo-lia subsp. dunniana-Arundinella nepalensis+Pogonatherum pa-niceum Association 6. Pinus yunnanensis var. tenuifolia-Phyllanthus emblica-Eulaliopsis binnata+Heteropogon contortus Association. 7. Pinus yunnanensis var. tenuifolia-Vaccinium sprengelii-Cymbopogon caesius+Eulalia speciosa Association. 8. Pinus yunnanensis var. tenuifolia-Phyllanthus emblica-Eulalia quadrinervis Association. 9. Pinus yunnanensis var. tenuifolia-Arundinella mepalenisis+Cymbopogon caesius Association. 10. Pinus yunnanensis var. tenuifolia-Quercus yuii-Arun-dinella nepalensis Association. 11. Pinus yunnanensis var. tenuifolia-Adiantum flabellula-tum Association.