不同更新方式对林地植被生长及土壤性状的影响

本文研究天然次生林采伐迹地的三种更新方式对林地植被及土壤性状的影响。结果表明,炼山人工造林对林地植被和土壤有一定的破坏作用,是影响林木生长、导致物种丧失、引起林地水土流失和地力衰退的重要原因。不同林分物种丰富度为:天然更新>人促更新>炼山人工造林;林下植被生物量为:人促更新>天然更新>炼山人工造林。不炼山的天然更新和人促更新,有利于物种多样性保护、植被生长、林地土壤理化性状改善和土壤肥力提高,并具有更高的经济效益。

The impact of different reproduction ways on the growth of forest vegetation and soil properties

The impacts of three reproduction ways on forest vegetation in natural secondary forest slashing were studied. The results indicated that artificial forestation destroyed the forest vegetation and soil, resulting the species loss, soil and water loss and soil fertility decline, unfavorable for the forest growth. The species abundant degree in different stands was: natural regeneration > artificial regeneration > artificial afforestation; the vegetation biomass under woods was artificial regeneration > natural regeneration > artificial afforestation. Natural regeneration and artificial regeneration were beneficial to protecting the species variety and the vegetative growth, as well as the improvement of the physical and chemical properties in soil and increase in soil fertility. As a result, the higher economic benefits could be obtained.