Soil hydrolase activities and kinetic properties as affected by wheat cropping systems of Northeastern China
2010
Zhang, Y.L.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Chen, L.J.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Sun, C.X.,Northeastern Univ., Shenyang (China). Sciences Coll. | Wu, Z.J.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Chen, Z.H.,Chinese Academy of Sciences, Shenyang (China). Inst. of Applied Ecology | Dong, G.H.,Lanzhou Univ. (China). Key Lab. of Western China's Environmental Systems
The impacts of 10-year cropping systems (wheat-cabbage sequential cropping, wheat-corn intercrop, wheat-sunflower rotation, wheat-soybean rotation) on soil enzyme properties of surface soil (0-20 cm) were studied in a study site in dry hilly land (cinnamon soil, Liaoning Province, Northeastern China). Total carbon, nitrogen, phosphorus and sulphur, and nine soil hydrolases related to nutrient availabilities (beta-galactosidase, alpha-galactosidase, beta-glucosidase, alpha-glucosidase, urease, protease, phosphomonoesterase, phosphodiesterase, arylsulphatase) were examined. Five enzymes kinetic characters were evaluated. Wheat-corn intercrop systems had higher total C, total N, total P and total S concentrations than wheat-soybean and wheat-sunflower rotation systems. Most test enzyme activities (alpha-galactosidase, beta-galactosidase, alpha-glucosidase, beta-glucosidase, urease, protease, phosphomonoesterase and arylsulphatase) showed the highest activities under wheat-corn intercropping system. Urease, protease and phosphodiesterase activities of wheat-cabbage sequential cropping system were significantly higher than those of two rotation systems. The maximum reaction rates of enzymes were higher than apparent enzyme activity, which suggests large potential activity of enzymes.
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