Effects of water regimes on soil biological properties in a paddy field

Abstract

Abstract: Effects of water regimes on soil biological properties were investigated in a field study during a rice (Oryza sativa L.) growing season in the Lower Reaches of Liaohe Plain.The number of bacterial-feeding nematodes at pre-tillage stage was higher in CK and FC than in MC and IC.Percolation-controlling markedly decreased the number of bacterial-feeding nematodes at yellow ripeness stage and that of fungal-feeding nematodes at pre-tillage stage.The number of fungal-feeding nematodes was found to be lower than that of bacterial-feeding nematodes in aquic brown soil.Percolation-controlling significantly decreased soil microbial biomass C at pre-tillage stage.Water regimes exhibited no effects on bacterial-feeding nematodes,fungal-feeding nematodes,microbial biomass Cand microbial biomass Nduring rice tillering and heading stages.No significant correlations were found between the number of bacterial-feeding nematodes,fungal-feeding nematodes and C,N in microbial biomass.

Key words: Landscape pattern, Landscape change, Taishan Mountains, Anthropogenic disturbances

CLC Number:

S511

OU Wei, LI Qi, LIANG Wenju, JIANG Yong, WEN Dazhong. Effects of water regimes on soil biological properties in a paddy field[J]. cje, 2004, (5): 53-56.

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