Effects of Freeze–Thaw Cycles on Brown Forest Soil Available Phosphorus in Northeastern China
2013
Qian, Duo | Fan, Haoming | Zhou, Lili | Wu, Min | Guo, Ping
Frequently occurring freeze–thaw events can affect soil nutrients. Available phosphorus (AP) is one of the most important plant nutrients in a brown forest soil. Initial soil moisture (15%, 20%, 25%, and 30%), fertilizer concentrations [0, 20, 40, and 60 ppm monopotassium phosphate (KH₂PO₄)], and freeze–thaw cycles (0, 1, 3, and 6) were considered to determine the effects of freeze–thaw events on AP, and the results indicated that (1) when variables initial soil moisture and fertilizer concentrations were defined, AP concentrations decreased with the increase of freeze–thaw cycles; (2) when variables freeze–thaw cycles and fertilizer concentrations were defined, AP concentrations presented decreased trend with the increase of initial soil moisture, especially initial soil moisture increase from 20% to 30%; and (3) when variables freeze–thaw cycles and initial soil moisture were defined, freeze–thaw events has more obvious influence on AP concentrations in soil samples with no fertilization added than mixed monopotassium phosphate (KH₂PO₄) before experiment.
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