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不同客土覆盖厚度对河滩地土壤养分分布的影响
张海欧1,2, 张扬1,2
1.陕西省土地工程建设集团有限责任公司, 陕西 西安 710075;2.陕西地建土地工程技术研究院有限责任公司 自然资源部 退化及未利用土地整治工程重点实验室 陕西省土地整治工程技术研究中心, 陕西 西安 710021
摘要:
[目的] 研究陕西省关中地区河滩地土地整治中不同覆土厚度下土壤碳氮的空间分布特征,确定耕作层稳定性的最佳客土厚度,旨在为河滩地难利用土地后备资源的开发利用提供理论依据。[方法] 于2015—2017年开展河滩地覆土田间小区试验,采用相关性分析法对不同覆土厚度条件下土壤有机质和全氮的分布特征、动态变化趋势及两者间的关系进行了研究。[结果] 不同覆土厚度下土壤有机质和全氮含量随土层加深而降低,土层深度与土壤有机质和全氮含量呈现负相关关系,土壤养分具有明显的表聚性;客土层厚度为50—60 cm时,相比其他覆土厚度类型,土壤有机质和全氮含量在各土层深度中最高,二者呈现出极显著的正相关关系(p<0.01)。[结论] 对于陕西省关中地区以黄绵土为客土来源的河滩地土地整治,客土覆盖厚度以50—60 cm为最佳,具有较好的保肥作用。
关键词:  河滩地  客土厚度  碳氮关系  分布特征  最佳客土厚度
DOI:10.13961/j.cnki.stbctb.2020.05.005
分类号:S153.6
基金项目:陕西省土地整治重点实验室开放基金项目“基于土地整治工程新增耕地的土壤有机碳稳定性研究”(2019-JC07)。
Effects of Different Thickness of Soil Cover on Soil Nutrient Distribution at Flood Land
Zhang Haiou1,2, Zhang Yang1,2
1.Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi'an, Shaanxi 710075, China;2.Institute of Land Engineering and Technology, Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural and Resources, Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Xi'an, Shaanxi 710075, China
Abstract:
[Objective] The spatial distribution characteristics of soil carbon and nitrogen under different soil thicknesses in areas of land consolidation on river beaches in the middle part of Shaanxi Province were studied. The optimal soil thickness for the stability of the arable layer was also determined in order to provide a theoretical basis for the development and utilization of the resources of difficult-to-use land on river beaches.[Methods] During the period from 2015 to 2017, a field trial involving the application of a soil cover on a floodplain was carried out. A correlation analysis was performed to determine the distribution characteristics, dynamic trends, and relationship between the soil organic matter and total nitrogen under different thicknesses of the soil cover.[Results] The soil organic matter and total nitrogen content decreased with increasing soil depth under different thicknesses of soil cover. The soil depth was negatively correlated with the soil organic matter content and total nitrogen content, and the soil nutrients exhibited surface aggregation. When the soil thickness was 50—60 cm, the soil organic matter content and total nitrogen content were the highest among all soil depths, and showed a significant positive correlation (p<0.01).[Conclusion] A soil thickness of 50—60 cm is optimal for the land reclamation of floodplains and offers a good fertilizer-holding effect in the middle part of Shaanxi Province.
Key words:  floodplain  thickness of soil cover  carbon and nitrogen relationship  distribution characteristics  optimal soil thickness