Chen Fu-Sheng, Yu Kun, Gan Lu, Liu Yi, Hu Xiao-Fei, Ge Gang
College of Life Sciences, Nanchang University, Nanchang 330031, China.
Ying Yong Sheng Tai Xue Bao. 2009 Jul;20(7):1529-35.
Effects of temperature, moisture and forest succession, as well as their interaction on nitrogen mineralization in hillside red soils in mid-subtropical region were investigated. The results showed that effects of temperature and succession stage on soil ammonification rate were significant with rate at 12 degrees C < 24 degrees C < 36 degrees C, and rate in shrub and Masson pine forest being lower than that in evergreen broad-leaved forest (P < 0.05), while the impact of moisture was not significant. Moisture and succession stage significantly affected the soil nitrification rate, with that of half-saturation being higher than natural and saturation moisture levels, and that in Masson pine forest being higher than in shrubs (P < 0.05), while temperature had no significant impact. The effects of temperature, moisture and succession stage on soil net N-mineralization rate were all significant, with 12 degrees C < 24 degrees C < 36 degrees C, half-saturation higher than natural and saturation, and shrubs < Masson pine forest < evergreen broad-leaved forest (P < 0.05). Soil ammonification and net N-mineralization rates increased with increasing temperature, while the maximum soil nitrification rate occurred at medium temperature. Moderate soil moisture would benefit the nitrogen mineralization process, and forest succession could improve soil nitrogen supply and restrain excessive nitrification.
研究了温度、水分、森林演替及其交互作用对中亚热带地区山坡红壤氮矿化的影响。结果表明，温度和演替阶段对土壤氨化速率影响显著，氨化速率表现为12℃＜24℃＜36℃，灌丛和马尾松林的氨化速率低于常绿阔叶林（P＜0.05），而水分的影响不显著。水分和演替阶段对土壤硝化速率影响显著，半饱和水分条件下的硝化速率高于自然水分和饱和水分条件，马尾松林的硝化速率高于灌丛（P＜0.05），而温度的影响不显著。温度、水分和演替阶段对土壤净氮矿化速率均有显著影响，表现为12℃＜24℃＜36℃，半饱和水分条件高于自然水分和饱和水分条件，灌丛＜马尾松林＜常绿阔叶林（P＜0.05）。土壤氨化速率和净氮矿化速率随温度升高而增加，土壤硝化速率最大值出现在中等温度条件下。适度的土壤水分有利于氮矿化过程，森林演替能够提高土壤氮素供应并抑制过度硝化作用。
