Characteristics of uncultivated land for acacia species supplying large timber in the north east, North Central and South Central Parts of Vietnam

Abstract

Investigating, assessing and analysing site elements in plantations and uncultivated land by specific approachs and expert techniques have identified suitable sites for those in order to attend to saw - log regime for some key spieces in the North East, North Central and South Central. They have resulted in the followings: (1) The uncultivated land (land yet to plant acacia and eucalyptus) has the great potential to grow acacia species in some provinces representing the three ecological regions: 58.669 hectares in Quang Ninh; 11.132 hectares in Bac Giang; 83.898 hectares in Thanh Hoa; 483.489 hectares in Nghe An; 24.486 hectares in Binh Dinh and 39.120 hectares in Phu Yen; (2) The uncultivated land which is appropriate to cultivation of three Acacia spieces for saw - log purpose in these ecological regions can be listed as follows: (i) barren hills; (ii) after burnt - over land; (iii) burnt - over land; (iv) Ia, Ib, Ic land and poor secondary forest land, etc.. They can be specifically named as follows: The North East: Fs, Fa, Ff, Fp; soil depth> 80cm; Slope <25o; stone ratio <20%; elevation above sea level <300m. Major vegetation is in the 1b, 1c land, burnt - over land, exploited natural forest; The North Central: Fs, Fp, Fa, Fk; soil depth> 80cm; Slope <25o ; stone ratio <20%; elevation above sea level <400m. Major vegetation is in the 1b, 1c land, burnt - over land, exploited natural forest; The South Central: Fa, Fs, Fk, Fp; soil depth> 80cm; Slope <2o ; stone ratio <20%; elevation above sea level <500m. Major vegetation is in the 1b, 1c land, burnt - over land, exploited natural forest.