Function of water-retention and soil-improvement of Schima superba fire forest belts in National Nature Reserve of Mount Tianmu.

In National Nature Reserve of Mount Tianmu , Schima superba was planted as fire protection tree at the fire belt in 1996 .The forest belts function of water-retention and soil-improvement was analysed in 1999 .The results indicated that the water amount intercepted by the crown of Schima superba was 5.237 thm-2 more than that of check (the fire belt of not any tree).The water amount stored by under-tree soil at 0 ～ 30 cm was 68.98 thm-2 more than that of check .The litter fallen from Schina superba and festratum contributed more nutrients to the soil , for example , the amount of N , P , K , Ca , Mg , Mn , Cu , Zn was 14.08 , 2.50 , 14.05 , 18.41 , 1.01 , 0.505 0 , 0.006 5 and 0.019 3 kghm-2 respectively more than that of check .The content of soil organic matter, total nitrogen , hydrolysable nitrogen , available phosphorus and readily available potassium was 2.20 , 1.45 , 1.56 , 1.30 and 1.46 times that of check respectively .