| 摘要: |
| 采用室内培养的方法，分析了磷添加对南亚热带鼎湖山马尾松林（PMF）、针阔叶混交林（PBMF）和季风常绿阔叶林（MEBF）土壤(0～10 cm) CO2、CH4排放/吸收和有机氮矿化的影响。结果表明：28周的培养，100mg磷添加处理土壤CO2-C累积排放量依次为PMF、PBMF和MEBF对照的82.4％、84.4％和102.8％，2000mg磷处理土壤依次为其对照的107.2％、101.2％和109.1％；100mg磷处理土壤CH4累积排放量依次为其对照的69.9％、102.7％和66.3％，2000mg磷处理土壤依次为其对照的－57.4％、25.3％和22.4％，其中，磷在处理初期较一致的提高土壤CO2和CH4排放，磷对土壤有机碳矿化的影响与森林的土壤状况有关，添加的磷浓度越高，其促进作用越强。1周的培养，100mg磷处理土壤有效氮净矿化量依次比PMF、PBMF和MEBF对照少37.06％、39.60％和28.62％，2000mg磷处理土壤依次比其对照少70.97%、84.14%和187.97％，100mg磷处理土壤硝态氮净矿化量依次比其对照少48.06％、40.45％和28.03％，2000mg磷处理土壤依次比其对照少254.09%、115.32%和238.50％，磷显著的抑制土壤有机氮的矿化和硝化。结果建议，在研究P对土壤有机碳氮矿化过程时应充分考虑土壤对P的吸附作用。 |
| 关键词: 磷添加 土壤有机碳 土壤有机氮 矿化 森林 |
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| 基金项目:国家自然科学基金资助项目（40730102）和华南植物园博士启动基金. |
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| Effects of P addition on organic C and N mineralization from subtropical forests soil during incubation, southern China |
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Wu Hui-Jun,Ouyang Xue-Jun
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Dinghushan Forest Ecosystem Research Station, South China Botanical Garden, Chinese Acadenmy of Science Zhaoqing 526070
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| Abstract: |
| The effect of P addition on organic C and N mineralization in soils (0~10 cm) from three forest types, pine (pinus massoniana) forest (PMF), pine and broad-leaved mixed forest (PBMF) and monsoon evergreen broad-leaved forest (MEBF), in Dinghushan, southern China, was studied based on indoor incubaiton. Soils were incubated at 25℃ for 28 wk or 1 wk. The results showed that the total CO2-C cumulative amount in the 28 wk incubation from PMF, PBMF and MEBF soil treated with100 mg P was 82.4％, 84.4％ and 102.8％of that from their control, respectively, and the amount treated with 2000 mg P was 107.2％, 101.2％和109.1％of that from their control, respectively; The CH4 cumulative amount from PMF, PBMF and MEBF soil treated with100 mg P was 69.9％, 102.7％ and 66.3％of that from their control, respectively, and the amount treated with 2000 mg P was -57.4％, 25.3％ and 22.4％of that from their control, respectively. The addition of P led to a short-term increase in CO2 and CH4 emission after P application, and the responses of CO2-C and CH4 evolution to P addition related to the added P concentration and forest types. The addition of P inhibited significantly organic N mineralization and N nitrification. The available N net production in the 1 wk incubation from PMF, PBMF and MEBF soil treated with100 mg P was less 37.06％, 39.60％ and 28.62％ than that from their control, respectively, the production treated with 2000 mg P was less 70.97%, 84.14% and 187.97％than that from their control, respectively; The nitrate net production from PMF, PBMF and MEBF soil treated with100 mg P was less 48.06％, 40.45％ and 28.03％than that from their control, respectively, the production treated with 2000 mg P was less 254.09%,115.32% and 238.50％ than that from their control, respectively. We suggested that the sorption of P to soil minerals must to be taken into account in the future research. |
| Key words: P Addition Soil Organic C Soil Organic N Mineralization Forest Type |
