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

Abstract

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.

CLC Number:

ZOU Ya-li, HAN Fang-hu, GEN Li-ying, SHEN Yu-ying. Effects of temperature and moisture on soil nitrogen mineralization of lucerne stands[J]. Acta Prataculturae Sinica, 2010, 19(4): 101-107.

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