| 吴健利,刘梦云,赵国庆,虞亚楠,刘丽雯,刘欢.黄土台塬土地利用方式对土壤有机碳矿化及温室气体排放的影响[J].农业环境科学学报,2016,35(5):1006-1015. |
| 黄土台塬土地利用方式对土壤有机碳矿化及温室气体排放的影响 |
| Effects of land-use types on soil organic carbon mineralization and greenhouse gas emissions in Loess tableland |
| 投稿时间：2015-10-29 |
| DOI：10.11654/jaes.2016.05.027 |
| 中文关键词: 黄土台塬 土地利用 矿化 活性碳 温室气体 |
| 英文关键词: Loess tableland land use carbon mineralization active carbon greenhouse gas(GHG) |
| 基金项目:农业部农业环境重点实验室开放基金资助;中国科学院重点部署项目资助(KFZD-SW-306) |
| 作者 | 单位 | E-mail | | 吴健利 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 刘梦云 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | lmy471993@163.com | | 赵国庆 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 虞亚楠 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 刘丽雯 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | | | 刘欢 | 西北农林科技大学资源环境学院, 农业部西北植物营养与农业环境重点实验室, 陕西 杨凌 712100 | |
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| 中文摘要: |
| 以黄土台塬区耕地、天然草地、灌木林地、乔灌混交林和乔木林地为研究对象,采用静态箱-气相色谱法、室内密闭培养法对其土壤温室气体及有机碳矿化动态进行了监测和分析。结果表明:土壤总有机碳和各种活性碳组分含量分布规律一致,均表现为草地显著高于林地,林地显著高于耕地(P <0.05);土壤有机碳矿化量趋势为培养初期增长迅速,后期增速缓慢,0~5 cm土层草地土壤有机碳矿化累积量是林地的1.26~1.34倍,是耕地的1.82倍,5~20 cm土层较0~5 cm土层有所降低,耕地降幅高达48%;不同土地利用土壤矿化碳潜力Cp值在0.81~2.70 mg·kg-1之间且差异显著(P <0.05),而不同土地利用土壤有机碳分解速率常数k差异不显著;五种土地利用方式的土壤可矿化碳累计分配比例表明,耕地土壤有机碳矿化能力最高,固存量最小,而草地土壤有机碳矿化能力最低,固存量最多;耕地土壤释放的主要温室气体CO2和N2O强度显著高于其他用地类型,而CH4的吸收强度为林地>天然草地>耕地。综上,退耕还林还草极大地推动了该区土壤有机碳的固定,减弱了土壤向大气排放温室气体的潜力。 |
| 英文摘要: |
| The present study was to investigate soil organic carbon(SOC) mineralization and greenhouse gas emissions under different land-use types. Five vegetation types, cultivated land, natural grassland, mixed forests, shrub land, shrubbery, and arboreal land, were chosen in Xianyang City in the Loess tableland area. SOC mineralization dynamics were examined by indoor airtight culture method and greenhouse gas emissions were determined by manually-closed static chamber technique. Results showed that soil total organic carbon(TOC) distribution pattern was consistent with that of active carbon component, which decreased in order of grassland > forest land > cultivated land. The SOC mineralization was faster at the early stage while became slower at the later stage. Cumulative SOC mineralization in grassland at the 0~5 cm depth was 1.26~1.34 times greater than that of woodland, and 1.82 times higher than that of cultivated land, whereas at the 5~20 cm soil SOC mineralization showed a decreased tendency compared to the 0~5 cm soil depth. A decrease of 48% was observed in cultivated land. The potential of soil SOC mineralization(Cp) under different land use types was between 0.81 and 2.70 mg·kg-1, with significant difference between different land use types(P<0.05). No differences in SOC decomposition rate constant k were found under different land use types. The ratios of soil carbon mineralization potential Cp to SOC showed that the cultivated land had the highest SOC mineralization but the lowest carbon sequestration, whereas the grassland had the lowest SOC mineralization but and the highest carbon sequestration. The emissions of CO2 and N2O were significantly higher in cultivated land than in other land use types. The CH4 absorption intensity was forest land>natural grassland>cultivated land. In conclusion, returning cultivated land to forestland and grassland could greatly promote organic carbon sequestration in soil and slow down emissions of greenhouse gases from soil into the atmosphere. |
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