• 论文 •

### 湖南南岭草地植被类型的数量分类、排序及其合理利用

1. 中国科学院植物研究所
• 出版日期:1991-06-25 发布日期:1991-06-25

### THE QUANTITATIVE CLASSIFICATION, ORDINATION AND RATIONAL UTILIZATION OF GRASSLAND VEGETATION TYPES OF THE NANLING MOUNTAINS, HUNAN PROVINCE

Yang Baozhen, Kong Dezhen

1. Institute of Botany, Academia Sinica
• Online:1991-06-25 Published:1991-06-25

Abstract: The zonal vegetation of the Nanling Mountains in Hunan Province is evergreen broadleaf forest. Due to unrational utilization of the land, many forests are severely destroyed and large areas of grassland have occurred. The total area of grassland is about 1497.2×107mu (9.98× 105 ha), occupying more than one fourth of the whole region. The classification and ordination of the grassland vegetation are studied with the numerical methods of TWINSPAN (Two-way indicative species analysis) and DCA (Detrended correspondence analysis). The methods use the data of 48 plots and 150 species for calculating. The plots of the fourth division are divided into 10 main vegetation types. At the first division level, the plots are distingguished into two types, the mountain grassland type (occurring at elevations of more than 1000 m) and the hill grassland type (occurring at elevations of less than 600m). The other levels are based on difference of ecological facters. The results are very similar to those of the qualitative classification, which demonstrates that the methods of TWINSPAN and DCA are suitable for the classification of the subtropical grassland.Distinctive types have different utilization ways. The types on the higher mountains should be dominated by forestry. At some place medicinal trees can be planted. At the places of the gentle slopes it is possible to establish artificial grassland for pasturage under paying attention to soil erosion- The slopes of over 25 degrees should be closed. At the places having slopes of 15-20 degrees it is suitable to develop both forestry and pasturage. The hills about 300-600m in elevation may be used for cultivating economical forests and fuel forests. Below the elevation of 300 m the fruit gardens (citrus) can be established if there is irrigation. On the hills of gentle slopes the artificial pasture ground can be developed, but it should be combined with forestry. In agricultural areas the rotation of cereal crops and forage grass should be put into practice. It is most important to increase the ecological and economical benefits.