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Acta Prataculturae Sinica ›› 2010, Vol. 19 ›› Issue (4): 101-107.

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Effects of temperature and moisture on soil nitrogen mineralization of lucerne stands

ZOU Ya-li1,2, HAN Fang-hu1,3, GEN Li-ying1, SHEN Yu-ying1   

  1. 1.College of Pastoral Agriculture Science and Technology, Lanzhou University, Key Laboratory of
    Grassland Agro-Ecosystems, Ministry of Agriculture, Lanzhou 730020, China;
    2.School of Life
    Science and Chemistry, Tianshui Normal University, Tianshui 741001, China;
    Center for Environmental Engineering of Yunnan Province, Kunming 650032, China
  • Received:2009-03-12 Online:2010-08-20 Published:2010-08-20

Abstract: The effects of temperature and moisture on nitrogen mineralization in the 0-10 cm soil layer from four years (4 a) and eight years(8 a) old lucerne stands in the Loess Plateau were determined by an incubation experiment with combinations of three temperature levels (5℃, 15℃, and 25℃) and three moistures levels (30%, 50%, and 70% of field capacity). Temperature was the dominant factor affecting net mineralization in the 0-10 cm soil layer from lucerne stands in the Loess Plateau. The highest net nitrification rates were 0.481 μg/(g·d)(4 a), 0.942 μg/(g·d)(8 a) with net mineralization rates of 0.293 μg/(g·d)(4 a), 0.632 μg/(g·d)(8 a), which were in the 25℃/70FC treatment after 14 days incubation. The highest nitrogen immobilization rate (0.232 μg/g·d) in soil from 4 a lucerne stands was in the 5℃/30FC treatment while it was 0.127 μg/(g·d) in the 5℃/70FC treatment for the 8 a stands. Microbial biomass carbon content in the 0-10 cm soil layer from 8 a lucerne stands was 1.44 times higher than that in the 4 a stands under 25℃/70FC condition. The differences of nitrogen mineralization rate and organic microbial C between two ages of lucerne soil are due to the difference of soil organic C content from the two soils.

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