| 摘要: |
| 【目的】研究西南地区缙云山不同土地利用方式下土壤有机碳（SOC）和全氮（TN）含量及储量的变化，以揭示土地利用方式对SOC和TN积累的影响。【方法】选取缙云山阳坡同一海拔高度处的亚热带常绿阔叶林地、坡耕地、果园和撂荒地，采集0～60 cm土层的土壤样品，对其进行SOC、TN以及土壤体积质量的测定分析。【结果】与林地相比，坡耕地和果园的SOC含量分别显著降低了43.83%，21.57%（P>0.05）；与坡耕地相比，撂荒地SOC含量极显著增加了239.17%（P=0.001）。相同土壤质量下，不同土地利用方式SOC储量存在显著差异（P<0.05），表现为撂荒地（108.06 Mg/hm2）>林地（62.21 Mg/hm2）>果园（54.54 Mg/hm2）>坡耕地（31.81 Mg/hm2）。撂荒地的TN含量及储量均显著高于其他土地利用方式，分别为0.91 g/kg和8.64 Mg/hm2，而林地、果园、坡耕地三者之间的TN含量及储量不存在显著差异。不同土地利用方式的SOC含量与TN含量之间呈显著的正相关关系。4种土地利用方式的C/N在5.35～12.11，其中撂荒地的C/N最高，坡耕地最低。【结论】撂荒地比坡耕地更有利于SOC和TN的蓄积；虽然林地、果园和坡耕地3种土地利用方式对土壤TN的影响不显著，但林地比果园和坡耕地更有利于SOC的积累；撂荒地有机质的矿化分解程度最低，最有利于土壤中有机质的积累。 |
| 关键词: 土地利用方式 土壤有机碳 土壤全氮 缙云山 |
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| 基金项目:国家自然科学基金项目(41005069,40975095和40805050)；中央高校基本科研业务费专项资金项目(XDJK2012A005)；西南大学生态学重点学科“211”工程三期建设项目 |
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| Effects of land use types on soil organic carbon and total nitrogen in Jinyun Mountain |
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| Abstract: |
| 【Objective】This paper studied contents and storages of soil organic carbon (SOC) and total nitrogen (TN) of different land use patterns in Jinyun Mountain in southwest China.【Method】The subtropical evergreen broad-leaved forest,sloping farmland,orchard and abandoned land were selected to collect soil samples from 0 to 60 cm depth at the same altitude of sunny slope in Jinyun Mountain and SOC,TN and soil density were analyzed.【Result】Compared to forest,SOC contents of sloping farmland and orchard decreased by 43.83% and 21.57%,respectively.Compared to sloping farmland,SOC content of abandoned land significantly increased by 239.17% (P=0.001).Under the same soil quality,SOC storages of different land use types showed significant differences (P<0.05),and their SOC storages were in a decreasing order of abandoned land (108.06 Mg/hm2)>woodland (62.21 Mg/hm2)>orchard (54.54 Mg/hm2)>slope farmland (31.81 Mg/hm2).TN contents and storage of abandoned land (0.91 g/kg and 8.64 Mg/hm2) were significantly higher than other land use types.There was no significant difference in TN contents and storages between woodland,orchard and sloping farmland.There was a significant correlation between soil SOC and TN.C/N ratio was in the range of 5.35 to 12.11.Abandoned land had the highest C/N ratio,while slope farmland had the minimum.【Conclusion】Abandoned land was more suitable for the accumulation of SOC and TN than farmland.Although there was no significant influence of forest land,farmland and orchard land on soil TN contents,forest was more suitable for the accumulation of SOC than orchard and sloping farmland.Abandoned land was in the lowest level of mineralization of organic matter,and it was the most favorable to the accumulation of organic matter in the soil. |
| Key words: land use type soil organic carbon soil total nitrogen Jinyun Mountain |
