Eco-Toxicological Effects of Salt Stress on Microorganisms and Enzymes Activities in Vegetable Soil
Influence of salt stress on microfiora and enzymes activities in vegetable soil was studied through artificially adding simulated composites salt (SCS) into natural vegetable soil. The SCS was designed according to components of the saline soil in Shanghai, which comprised 14.6% Ca2+ 7.9% Na+,4.0% Mg2+, 45.4% NO-3, 16.0% SO2-4, 12.1% Cl-.Compared with the control, bacteria amount decreased, but acti-nomyeete increased in all four different salt-enhanced soils( 1, 5, 10, 20 g·kg-1) at all five testing intervals. In additions, fungi rose up in all the salt-enhanced soils at 15th day, and then dropped down at 30th, 45th and 70th day. The ratio of bacteria/microorganisms-cultured in soil ( MCS ) decreased and that of fungi/MCS increased. There were negative correlation between the activities of four enzymes (urease, protease, invertase and catalase) and salt content except for invertase, catalase under the low salt stress( 1 g·kg-1). Correlation analysis indicated that the activities of soil urease, protease, invertase and catalase were highly negative linear correlation with salt content in vegetable soil. Especially, the correlations between protease and invertase were high and stable, and the coefficients were between -0.930 and -0.997.
salt stressmicrobeenzyme in soileco-toxicologyvegetable soil
国家科技期刊平台
NSTL
万方数据
维普
