桂西南地区黑木相思生长规律、生物量及生产力研究

采用标准地平均木树干解析法对桂西南地区9年生黑木相思人工林的生长规律、生物量、生产力进行研究,结果表明:黑木相思人工林树高、胸径的生长高峰期出现在2~4年生时,树高、胸径连年生长量与平均生长量相交年龄分别是在4、5年生,材积的数量成熟期在8年生以后。9年生时,胸径(带皮)、树高、单株材积、立木蓄积分别为14.9 cm、15.8 m、0.13368 m3、189.15 m3.hm-2;平均木单株各器官的生物量所占比例大小分别为树干枝根干皮叶,干材所占比例达到58.18%;乔木层总生物量为173.32 t.hm-2,净生产力为19.26 t.hm-2.a-1。

The Growth Regularity,Biomasses and Productivity of Acacia melanoxylon in the Southwest of Guangxi

In the paper,the growth regularity,biomasses and productivity of the 9-yearold Acacia melanoxylon were studied in the southwest of Guangxi.The results showed that the high growth period of the tree height and DBH was in the early 2～4 years,and the intersection age when the average growth and the annual growth of height and DBH was in the fourth year and the fifth year,respectively.The mature period of volume was after the eighth year.The outside bark diameter at breast height(DOB),tree height,single volume and hectare volume were 14.9 cm,15.8 m,0.13368 m3,189.15 m3·hm-2,respectively.The proportion order of every organ biomasses for average tree was stem>branch>root>bark>leave,which of stem was 58.18%.The total biomasses and net productivity of the tree layer were respectively 173.32 t·hm-2,19.26 t·hm-2·a-1.