苍梧县低效防护林综合改造技术研究

苍梧县是珠江防护林体系建设的重点县。由于人为干扰、树种选择不当、经营措施不合理等原因,林分退化严重,生态环境遭到破坏,形成较大面积的低效马尾松纯林、湿地松纯林和低效次生阔叶林。本研究通过对低效林分的土壤理化性质、凋落物、植物多样性、生物量等的调查,提出了对苍梧县低效林采取异龄混交、调整群落结构、调控林分密度、抚阔补珍、抚针植阔和封育补植等一系列综合改造技术,并对几种低效林分改造后形成的不同林分结构的土壤物理、化学性质及持续特性等效果进行了初步评价。

Study on the comprehensive improving techniques of low-effective shelter forest in Cangwu County

Cangwu County is one of the key counties of carrying out project of shelter forest system construction along Zhujiang River.Due to the forest degradation and ecological environment damage resulting from human disturbance,inappropriate tree species selection and irrational management measures,there are large areas of low-effective pure Pinus massoniana forest,pure Pinus elliottii forest and low-effective secondary broad-leaved forest.In this paper,through the investigations of the soil properties,litter,plant diversity and biomass of low-effective forests,the comprehensive improving techniques,such as mixing uneven-aged stands,community structure adjustment,stand density adjustment,planting conifers in conserved broad-leaf stands,planting broad-leaf trees in conserved conifers stands,mountain-closuring and complementary planting in low-effective forests were proposed.