摘要
研究了温度、水分和演替阶段及其交互作用对中亚热带丘陵红壤区森林土壤氮素矿化过程及其矿化速率的影响.结果表明:温度和演替阶段对土壤氨化速率影响显著,其中12℃<24℃<36℃,灌丛林和马尾松(Pinus massoniana)林低于常绿阔叶林(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有显著影响,土壤半饱和含水量高于自然含水量及饱和含水量,且马尾松林高于灌丛林(P<0.05);而温度的影响不显著.温度、水分和演替阶段对土壤氮净矿化速率的影响均显著,其中12℃<24℃<36℃,土壤半饱和含水量高于自然含水量和饱和含水量,灌丛林<马尾松林<常绿阔叶林(P<0.05).温度升高有利于提高土壤氨化速率和净矿化速率,温度过高则抑制土壤硝化速率;土壤含水量适中有利于土壤氮素矿化过程;顺行演替将提高土壤供氮能力,且抑制过强的硝化作用.
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 ℃ 〈24 ℃ 〈36 ℃, 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 ℃ 〈 24 ℃ 〈 36 ℃, 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.
出处
《应用生态学报》
CAS
CSCD
北大核心
2009年第7期1529-1535,共7页
Chinese Journal of Applied Ecology
基金
国家自然科学基金项目(30600473)
江西省自然科学基金项目(2007GQN1935)
江西省教育厅科技项目(GJJ08055)资助
关键词
土壤氮素矿化
好氧培养法
中亚热带丘陵红壤区
森林演替
全球变化
nitrogen mineralization
aerobic incubation method
hilly red soil in mid-subtropical region
forest succession
global change
