title: [Effects of chlorimuron-ethyl and urea on soil microbial biomass carbon and nitrogen and soil inorganic nitrogen].
abstract: A microcosm experiment was conducted to study the effects of different concentration chlorimuron-ethyl (20, 200, and 2000 microg x kg(-1) soil) and its combination with urea (120 mg x kg(-1) soil) on the dynamic changes of soil microbial biomass carbon and nitrogen and soil nitrate nitrogen and ammonium nitrogen. Applying chlorimuron-ethyl alone decreased the soil microbial biomass carbon and nitrogen throughout the experiment period (60 days), and the decrement increased with increasing chlorimuron-ethyl concentration. Chlorimuron-ethyl had little effects on the soil ammonium nitrogen and nitrite nitrogen in the early period of the experiment, but increased the soil ammonium nitrogen in the mid-period (15 d) and the soil nitrate nitrogen in the late period (after 30 days) significantly. Both urea addition and its combination with chlorimuron-ethyl increased the soil microbial biomass carbon and nitrogen obviously in a short time, but the effect of combined addition of urea and chlorimuron-ethyl weakened then. Applying urea and its combination with chlorimuron-ethyl resulted in a lasting increase of soil nitrate nitrogen and ammonium nitrogen.
authors.affiliation: State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110164, China. tan.huanbo@gmail.com
authors.forename: Huan-Bo
authors.initials: HB
authors.lastname: Tan
authors.forename: Xin-Yu
authors.initials: XY
authors.lastname: Li
authors.forename: Hui-Wen
authors.initials: HW
authors.lastname: Zhang
authors.forename: Xu
authors.initials: X
authors.lastname: Li
authors.forename: Ming-Kai
authors.initials: MK
authors.lastname: Xu
mesh_terms: D002244:Carbon / Q000032:analysis* / Q000378:metabolism; D003198:Computer Simulation; D006540:Herbicides / Q000494:pharmacology; D009584:Nitrogen / Q000032:analysis* / Q000378:metabolism; D011743:Pyrimidines / Q000494:pharmacology*; D012987:Soil; D012988:Soil Microbiology; D013453:Sulfonylurea Compounds / Q000494:pharmacology*; D014508:Urea / Q000494:pharmacology*
chemical_list: D006540:Herbicides; D011743:Pyrimidines; D012987:Soil; D013453:Sulfonylurea Compounds; D002244:Carbon; D014508:Urea; C112343:chlorimuron ethyl; D009584:Nitrogen