Changes of Soil Nitrogen from Sheep Urine Patches in Inner Mongolia Steppe

doi:10.7668/hbnxb.2007.S2.037

Abstract

Abstract: In Inner Mongolia steppe,the paper studied the changes of soil nitrogen in sheep urine patches,the results indicated:Urine addition increased soil NH₄⁺-N concentrations immediately,but did not increase soil NH₃^--N concentrations significantly(p＜0.05) 7 d.Adding urine significantly(p＜0.01) increased soil NH₄⁺-N concentrations and had the maximum at day 3th.Before 7 d soil NH₃^-N was significantly(p＜0.05) lower than those of the control,but increased significantly(p＜0.01)after 7 d.Soil NH₄⁺-N was significantly(p＜0.05) higher than soil NH₃^--N before 35 d,but soil NH₃^--N was significantly(p＜0.05) higher than soil NH₄⁺-N after 35 d.After urine addition soil microbial biomass N(MBN) increased and had the maximum 35th,soil microbial biomass N was significantly(p＜0.05)higher than the control in layer 0-5 cm and 5-10 cm,but no significant difference in layer 10-20 cm(p＜0.05).Urine addition significantly(p＜0.05) increased extractable soil organic N(ESON) concentrations and had the maximum at 7 d.There were significant positive correlations between soil inorganic nitrogen and soil extractable soil organic N and soil microbial biomass N(p＜0.05,p＜0.01),but no significance between soil extractable,soil organic N and soil microbial biomass N(p＞0.05).

Key words: Inner Mongolia steppe, Sheep urine patch, Soil nitrogen, Grazing

CLC Number:

S155.4+7

LIU Zhong-kuan, ZHI Jian-fei, QIN Wen-li. Changes of Soil Nitrogen from Sheep Urine Patches in Inner Mongolia Steppe[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2007, 22(S2): 146-151. doi: 10.7668/hbnxb.2007.S2.037.

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