岩溶区和碎屑岩区林地和农田土壤氮矿化过程对比研究

曾四满; 刘满强; 陈小云; 朱同彬; 曹建华; Christoph Müller

doi:10.11932/karst20160304

岩溶区和碎屑岩区林地和农田土壤氮矿化过程对比研究

doi: 10.11932/karst20160304

1.
南京农业大学资源与环境科学学院土壤生态实验室
2.
中国地质科学院岩溶地质所/国土资源部、广西壮族自治区岩溶动力学重点实验室
3.
Department of Plant Ecology, Justus-Liebig University Giessen

基金项目: 国家自然科学基金（41301313）；中国地质科学院岩溶地质研究所基本科研业务费项目（2015004）；公益性行业（农业）科研专项（201503121）

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出版历程
- 发布日期: 2016-06-25

Comparative study on nitrogen mineralization of soil in woodland and cropland in karst and clasolite regions

1.
Soil Ecology Lab of Resources and Environmental Sciences, Nanjing Agricultural University
2.
Institute of Karst Geology, CAGS/Key Laberatory of Karst Dynamics, MLR & GZAR
3.
Department of Plant Ecology, Justus-Liebig University Giessen

摘要

摘要: 通过15N标记法和MCMC氮素转化模型，研究了岩溶区（石灰性土壤）和碎屑岩区（红壤）林地和农田土壤易分解有机氮矿化（M易）、难分解有机氮矿化（M难）和总有机氮矿化（M总）速率。结果发现，土壤矿化速率受土壤类型和土地利用方式的显著影响。林地石灰性土壤M总（3.71 mg N/kg）显著低于林地红壤（5.57 mg N/kg），石灰性土壤MNlab（1.81 mg N/kg）与MNrec（1.90 mg N/kg）相近，而红壤M易（4.60 mg N/kg）显著高于M难（0.96 mg N/kg）。林地变为农田后，石灰性土壤M总显著提高，而红壤显著降低。与林地相比，岩溶区农田土壤M易提高了72.5%，而M难下降了33.7%。碎屑岩区农田土壤M易和M难分别降低至2.47和0.46 mg N/kg。岩溶区土壤CaO和MgO含量与M易呈显著负相关，而与M难呈显著正相关，表明岩溶区土壤钙镁含量是影响氮矿化速率的重要因素。
- 岩溶区 /
- 15N /
- 矿化速率 /
- 难分解有机氮 /
- 易分解有机氮
Abstract: In this study, the 15N tracing technique and N transformation model were used to investigate the mineralization of labile organic nitrogen (as N) (MNrec), recalcitrant organic N (MNlab) and organic N (MNorg) to NH4+ in calcareous and red soils of woodland and cropland in karst and clasolite regions, respectively. The results show that soil N mineralization rates are significantly affected by soil types and land uses. MNorgin calcareous soil (3.71 mg N/kg/d) of woodland is considerably lower than that of red soil (5.57 mg N/kg/d). There is no significant difference between MNlab(1.81 mg N/kg/d) and MNrec(1.90 mg N/kg/d) observed in calcareous soil of woodland. However, the MNlab(4.60 mg N/kg/d) is much higher than MNrec(0.96 mg N/kg/d) in red soil of woodland. After converting woodland into cropland, the MNorglevel significantly increases to 4.21 mg N/kg/d in calcareous soil, but it decreases to 2.93 mg N/kg/d in red soil. In contrast to woodland, MNlabincreases by approximately 72.5% and MNrec decreases by approximately 33.7% in calcareous soil of cropland, respectively. CaO and MgO concentrations in calcareous soils are related positively with MNlab but negatively with MNrec, suggesting that soil CaO and MgO are the important factors affecting N mineralization rates in karst regions.
- karst region /
- 15N /
- mineralization /
- labile organic N /
- recalcitrant organic N

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