Short- and long-term effects of heavy metals on urease activity in soils

Microbial biomass carbon and enzyme activities of urban soils in Beijing

“…The urease activities of the heavy metal contaminated soils were significant reduced (Moreno et al 2003;Kandeler et al 2000;Doelman and Haanstra 1986;Tyler 1974). In Nanjing, the urease activity of urban soil measured 2.43 mg N g −1 24 h −1 (Hao et al 2009 (Wang et al 2007).…”

White Oak Creek Watershed: Melton Valley Area Remedial Investigation Report, Oak Ridge National Laboratory, Oak Ridge, Tennessee: Volume 3 Appendix C

“…After 12 weeks, neither mineralization nor nitrification was affected by Cr at either pH. Haanstra and Doelman (1991) investigated short-and long-term effects of Cr on arylsulfatase activity, urease activity (Doelman and Haanstra, 1986), and total phosphatase activity (Doelman and Haanstra, 1989) by native soil microflora in five soils. The highest ECsOs were 3203, 5512, and 4470 ppm, respectively, for arylsulfatase, phosphatase, and urease activities found in different soils.…”

“…After 49 days, nitrification was severely inhibited in all three soils (98 to 100%) by 1000 ppm Zn, while Zn at 100 ppm had no effect. Haanstra and Doelman (1991) investigated short-and longterm effects of Zn on arylsulfatase activity, urease activity (Doelman and Haanstra, 1986), and total phosphatase activity (Doelman and Haanstra, 1989) by native soil microflora in five soils. In the 6-week study the highest EC,,s were 5559,3623, and 1780 ppm for arylsulfatase, phosphatase, and urease activities, all in the soil with the greatest content of clay.…”

Toxicological benchmarks for screening potential contaminants of concern for effects on soil and litter invertebrates and heterotrophic process

“…Haanstra and Doelman (1991) investigated short-and long-term effects of metals on arylsulfatase activity, urease activity (Doelman and Haanstra, 1986), and total phosphatase activity (Doelman and Haanstra, 1989) by native soil microflora in five soils (sand, sandy loam, silt loam, clay, and sandy peat) of varying characteristics. Soil pH ranged from 7.7 to 4, organic matter content from 1.6 to 12.8%, and clay from 2 to 60%.…”

“…Haanstra and Doelman (1991) investigated short-and long-term effects of Zn on arylsulfatase activity, urease activity (Doelman and Haanstra, 1986), and total phosphatase activity (Doelman and Haanstra, 1989) by native soil microflora in five soils, described for Cd. In the 6-week study on the effects of Zn, data from the sandy peat soil were not available for any of the enzymes.…”