| 摘要: |
| 【目的】研究不同土地利用方式下土壤有机碳与其他土壤理化指标的关系，旨在为低山丘陵区土壤改良提供参考。【方法】2012-07-09，在内蒙古赤峰市低山丘陵区，通过野外调查和室内分析，运用灰色关联分析和逐步回归分析，对敖汉旗黄花甸子小流域山杏（Prunus sibirica）林、柠条（Caragana microphylla）林、小叶杨（Populus simonii）林、白榆（Ulmus pumila）林、天然草地、油松×山杏（Pinus tableulaeformis×P.sibirica）混交林、天然次生灌木林及农业用地8种土地利用方式下，土壤有机碳、全氮、有效磷、速效钾、微生物生物量碳含量及pH值进行了测定，并对土壤有机碳与其他土壤理化指标的关系进行了分析。【结果】山杏林、柠条林、小叶杨林、白榆林、天然草地、油松×山杏混交林、天然次生灌木林及农业用地0～100 cm土层有机碳含量平均值差异明显，分别为7.72，5.23，7.40，6.11，3.14，10.26，17.51和5.33 g/kg。不同土地利用方式下土壤有机碳与全氮、pH值、微生物生物量碳、速效钾及有效磷的关联系数分别为0.70，0.66，0.63，0.57及0.55。在灰色关联分析的基础上，最终建立了土壤有机碳与其他土壤理化指标的最优回归方程。【结论】不同土地利用方式的土壤有机碳含量差异较大，土壤有机碳与其他土壤理化指标的关联系数由大到小排序为：全氮>pH值>微生物生物量碳>速效钾>有效磷；建立的土壤有机碳（Y）与全氮（X2）、pH值（X5）最优回归方程为：Y=-6.269 8+19.383 2X2-0.010 2X5，R2=0.85。 |
| 关键词: 土地利用方式 土壤有机碳 土壤理化指标 内蒙古低山丘陵区 |
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| 基金项目:内蒙古应用研究与开发计划项目“农林牧耦合生态系统固碳关键技术”（20110732）；中国科学院战略性先导科技专项（XDA05060602） |
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| Relationship between soil organic carbon with other soil physical and chemical indexes of different land use types |
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| Abstract: |
| 【Objective】This study aimed to research the relationship between soil organic carbon and other soil physical and chemical indexes.【Method】Field investigation and laboratory analysis using grey correlation and stepwise regression analysis were applied to analyze soil properties including total nitrogen,available P,available K,pH and microbial C in Aohan County of Huanghuadianzi Small Watershed.Eight land use types,Prunus sibirica land,Caragana microphylla land,Populus simonii land,Ulmus pumila land,Pinus tableulaeformis×Prunus sibirica land,secondary forest of natural bush land,natural grassland and agricultural land were adopted to explore the correlation between soil organic carbon and other soil physical and chemical indexes.【Result】The results showed that soil organic carbon contents of Prunus sibirica land,Caragana microphylla l and,Populus simonii land,Ulmus pumila land,natural grassland,Pinus tableulaeformis×Prunus sibirica land,secondary forest of natural bush land and agricultural land with 0-100 cm soil layer were 7.72,5.23,7.40,6.11,3.14,10.26,17.51 and 5.33 g/kg,respectively and the differences were significant (P<0.05).The grey relational coefficients between soil total nitrogen,pH,microbial biomass carbon,soil available K,available P and organic carbon were 0.70,0.66,0.63,0.57 and 0.55,respectively.An optimal stepwise regression equation between organic carbon and other soil chemical indexes was built as well.【Conclusion】The contents of soil organic carbons of different land use types were in a decreasing order of secondary forest of natural bush land>mixed plantation forest>pure plantation forest>agricultural land>natural grassland.The grey relational coefficients were in a decreasing order of total nitrogen>pH> microbial C>available K>available P.An optimal stepwise regression equation between soil organic carbon(Y) and total nitrogen(X2) and pH(X5)was obtained (Y=-6.269 8+19.383 2X2-0.010 2X5,R2=0.85). |
| Key words: land use type soil organic carbon other soil physical and chemical indexes the low hilly land in Inner Mongolia |
