SEASONAL AND SPATIAL DYNAMICS OF PLANT-AVAILABLE N AND P POOLS AND N-MINERALIZATION IN RELATION TO FINE ROOTS IN A DRY TROPICAL FOREST HABITAT

被引:77
作者
ROY, S [1 ]
SINGH, JS [1 ]
机构
[1] BANARAS HINDU UNIV, DEPT BOT, VARANASI 221005, UTTAR PRADESH, INDIA
关键词
D O I
10.1016/0038-0717(94)00138-Q
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Seasonal dynamics of mineral N (NH4+ and NO3-), available P (NaHCO3-Pi) and N-mineralization rates in patchy and adjacent microsites of a dry tropical forest were examined in relation to fine root biomass. Patchy microsites were richer in mineral N and P. Year-long averages indicated that NH4+ dominated over NO3- in the nutrient rich patchy microsites where fine root biomass, production and turnover were comparatively greater than in the nutrient-poor adjacent microsites which were dominated by NO3-. However, during the wet season nitrate was the dominating form of mineral-N in all the microsites. N-mineralization was higher in the patchy microsites than in the adjacent microsites. Fine root biomass was positively correlated with the N-mineralization and nitrification rates in nutrient-rich microsites indicating that fine root development was facilitated by higher amounts of mineral-N irrespective of the form in which N was prevalent.
引用
收藏
页码:33 / 40
页数:8
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