Management techniques for a secondary Pinus massoniana forest in central Guizhou Province

Key words: 
• silviculture /
• Pinus massoniana /
• secondary forest /
• forest management for land use classification /
• appropriate management techniques

Abstract: This study determined a set of management techniques for improving a secondary Pinus massoniana forest. Using existing forest management as a classification scheme,the forest was divided into ecological and commercial forests having different management objectives,such as protection forests,timber products forests,and forests for fiberboard or chipboard. Temporary plots of different management types were surveyed; a set of experimental plots were set up and measured for age class in the Duyun area of central Guizhou Province. Appropriate management techniques for this area included restricting access to hillsides to protect the forest,preventing forest fires,retaining 15-30 seed trees per hectare,thinning seedlings rationally in the second year after renew,and retaining a density of 3 000-5 000 seedlings per hectare. For the managed ecological forest,seedlings of broadleaf species were necessary to provide cover in cleared areas,and thinning of young and middle-aged trees,as well as fertilizing middle-aged trees was not necessary. If managing a commercial forest,P. massoniana seedlings should be planted in open areas. A young stand of P. massoniana required tending once per year for 2-3 years with a 30%-50% thinning at age 7; a middle-aged stand needed a 20%-40% thinning at ages 13-14 along with fertilizer applications of 1 000-1 500 g calcium phosphate per tree and 150-300 g of urea.