华南水土流失区植被建设研究──以广东珠海试验研究为例

THE RECONSTRUCTION OF VEGEIATION ON SERIOUSLY ERODED LAND IN SOUTH CHINA

分析了华南水土流失区的植被状况和环境特征，提出了水土流失区植被建设应具有生态持续性的目标，应着眼于地带性植被群落的建立。据此把植被建设过程划分为3个阶段：①裸露地的植被恢复；②残留植被的改造；③先锋群落的更新。以广东珠海市试验研究为例。总结出各阶段植被建设的具体方法，着重评价了这些植被建设方法的优点和生态效益。

The precent situation of vegetation and envimpt fcatures in the areas affected by serious soil erosion in South China are analysed. It is considered that the way to the reconstruction of vegtation on eroded land should follow the succession law of biotic zonality, and should possess a constructive objective 0f ecologic sustainability. While vegetation being recovered, attention should be paid to the construction of the zonal-vegetation. The process of the reconstruction of vegetation can be divided into three phases: 1) The restoration of pioneer vegetation on the bare land; 2) The transformation of relict communitites: 3) The regeneration of pioneer communities. From 7 years experiment, it is shown that the way of cowbination of forest and grass may achieve good results in vegetation restoration and emeion control on barren land. Transforming relict and regenerating pioneer communities at the right the not only can speed up the formation of mixed forest, but also promote the progressive succession of vegetation. Mixed forest has better ecological benefits than pure forest. For example, the water capacity of Cinnamomum camphora - Cinnamonum buranii - Piaus massoniana mixed forest is nealy three times as high as that of the Acacia mangium pure fomet. Furthermore, the pest-resistant capability of mixed forest is alao higher than that of the pure forest.