MICROBIAL-C, MICROBIAL-N AND MICROBIAL-P IN DRY TROPICAL SAVANNA - EFFECTS OF BURNING AND GRAZING

被引:59
作者
SINGH, RS [1 ]
SRIVASTAVA, SC [1 ]
RAGHUBANSHI, AS [1 ]
SINGH, JS [1 ]
SINGH, SP [1 ]
机构
[1] KUMAUN UNIV, DEPT BOT, Naini Tal 263001, INDIA
关键词
D O I
10.2307/2404213
中图分类号
X176 [生物多样性保护];
学科分类号
090705 ;
摘要
(1) The effects of burning and grazing of dry tropical Indian savanna on the level of available nutrient pools and microbial C, N and P were assessed. (2) The maximum amounts of available nutrients and microbial biomass occurred in the dry period and minimum in the wet period. (3) Burning and grazing increased inorganic N by 54% and 15-49%, respectively and also increased bicarbonate-extractable inorganic P by 35% and 27-32%, respectively. (4) Mean annual microbial C varied from 361 to 466-mu-g g-1, microbial N from 35 to 44-mu-g g-1 and microbial P from 16 to 23-mu-g g-1 dry soil. The mean annual microbial C, N and P were positively related to each other. (5) Burning increased microbial C by 18%, microbial N by 26% and microbial P by 35%, and grazing increased microbial C by 15-18%, microbial N by 14-23% and microbial P by 19-29%.
引用
收藏
页码:869 / 878
页数:10
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