文章摘要
黄土丘陵沟壑区不同土地利用类型下土壤有机碳分布特征及影响因子
Distribution characteristics and influencing factors of soil organic carbon in different land use types in the loess hilly-gully region
投稿时间:2024-07-10  
DOI:10.13254/j.jare.2024.0510
中文关键词: 黄土高原  土地利用类型  土壤有机碳  环境因子  固碳潜力
英文关键词: Loess Plateau  land use type  soil organic carbon  environmental factor  carbon sequestration potential
基金项目:黄河上中游管理局项目(2023-J-11)
作者单位E-mail
马瑞 黄河水利委员会绥德水土保持科学试验站, 陕西 榆林 719000
水利部黄土高原水土保持野外科学观测研究站, 陕西 榆林 719000
黄土高原水土保持与生态修复国家林业和草原局重点实验室, 陕西 榆林 719000 
 
李旭强 黄河水利委员会绥德水土保持科学试验站, 陕西 榆林 719000
水利部黄土高原水土保持野外科学观测研究站, 陕西 榆林 719000
黄土高原水土保持与生态修复国家林业和草原局重点实验室, 陕西 榆林 719000 
 
帖聪晓 黄河水利委员会绥德水土保持科学试验站, 陕西 榆林 719000
水利部黄土高原水土保持野外科学观测研究站, 陕西 榆林 719000
黄土高原水土保持与生态修复国家林业和草原局重点实验室, 陕西 榆林 719000 
 
侯清瑶 黄河水利委员会绥德水土保持科学试验站, 陕西 榆林 719000
水利部黄土高原水土保持野外科学观测研究站, 陕西 榆林 719000
黄土高原水土保持与生态修复国家林业和草原局重点实验室, 陕西 榆林 719000 
 
刘立峰 黄河水利委员会绥德水土保持科学试验站, 陕西 榆林 719000
水利部黄土高原水土保持野外科学观测研究站, 陕西 榆林 719000
黄土高原水土保持与生态修复国家林业和草原局重点实验室, 陕西 榆林 719000 
llf_202209@163.com 
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中文摘要:
      为探究黄土丘陵沟壑区土壤有机碳特征,本研究以该区域典型县域(富县、吴起和绥德)为研究对象,探讨了各区域不同土地利用类型(耕地、草地、林地)0~30、30~60、60~80 cm土层的有机碳含量及其影响因素。结果表明:土壤有机碳平均含量表现为富县(4.66 g·kg-1)>吴起(3.98 g·kg-1)>绥德(2.51 g·kg-1)(P<0.05)。富县草地及林地土壤有机碳含量较耕地分别减少 4.90%和12.07%,林地较草地减少6.83%;吴起草地及林地土壤有机碳含量较耕地分别增加33.14%和11.90%;绥德耕地与林地的土壤有机碳含量无显著差异。研究区土壤有机碳主要集中在 0~30 cm土层,占比 40%~52%;相较于深层土层(60~80 cm),表层土层(0~30cm)更易受到土地利用类型的影响,进而影响有机碳的固存能力;深层土壤的固碳能力较低,三个县域林地土壤60~80 cm土层平均贡献了24%的有机碳;土壤有机碳含量与全氮呈极显著正相关(P<0.01),与pH呈极显著负相关(P<0.01)。研究表明,区域差异和土地利用类型对土壤有机碳积累影响显著,应对区域土壤有机碳积累的响应策略和途径各不相同。
英文摘要:
      Land use type is considered to be one of the important factors affecting soil organic carbon(SOC)sequestration, and vegetation restoration can affect SOC content and stability. In order to explore the characteristics of SOC in loess hilly-gully region, typical counties in the region of Fuxian, Wuqi and Suide selected as the research objects, the SOC content of soil layers(0-30 cm, 30-60 cm, 60-80 cm)and influencing factors of different land use types(farmland, grassland, and forest)in different regions were discussed. The results showed the average values content of SOC in the study regions showed as follows:Fuxian(4.66 g·kg-1)> Wuqi(3.98 g·kg-1)> Suide(2.51 g·kg-1)(P< 0.05). Compared with the farmland, the SOC content of grassland and forest in Fuxian decreased by 4.90% and 12.07%, respectively, and the content of SOC in forest decreased by 6.83% compared with those of grassland. Compared with the farmland, the SOC content of grassland and forest in Wuqi increased by 33.14% and 11.90%, respectively. There were no difference in the SOC content between farmland and forest in Suide. The content of SOC in the study area was mainly concentrated in surface soil layer(0-30 cm), accounting for 40%-52%. Compared with the deep soil layer(60-80 cm), the surface soil layer(0-30 cm)was more susceptible to the impact of land use type, which in turn affected the sequestration capacity of SOC. The average contribution of forest in the 60-80 cm soil layer was 24% of the organic carbon. The content of SOC was extremely significantly positively correlated with TN(P<0.01) and extremely significantly negatively correlated with pH(P<0.01). In conclusion, regional differences and land use types have significant effects on the accumulation of SOC, and the response strategies and approaches for regional SOC accumulation vary.
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