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不同使用年限设施土壤DTPA浸提态铜和锌的剖面分异

Profile Differentiation of DTPA-extractable Copper and Zinc in Greenhouse Vegetable Soil with Different Plantation Ages
作者
张玉革(沈阳大学环境学院 区域污染环境生态修复教育部重点实验室 沈阳)
王皓然(沈阳大学环境学院 区域污染环境生态修复教育部重点实验室 沈阳)
冯雪(中国科学院沈阳应用生态研究所 土壤与养分管理国家工程实验室 沈阳)
姜勇(中国科学院沈阳应用生态研究所 土壤与养分管理国家工程实验室 沈阳)
中文关键词
土壤肥力;微量元素;土壤pH;土壤有机质; 土壤养分;电导率
英文关键词
Soil fertility; Micronutrient; Soil pH; Soil organic matter; Soil nutrient; Electric conductivity
中文摘要
依托辽宁省新民市大民屯设施蔬菜生产基地,分别选取了露地和使用年限为2、5、10和15年的设施菜地,采集了0~150 cm深度内8个土层的样品,测定了DTPA浸提态微量元素Cu和Zn含量及与之相关的化学指标,分析了土壤Cu和Zn的剖面分异及其影响因素。结果表明,DTPA浸提态Cu和Zn具有显著的剖面分异和表层集聚现象,0~60 cm土层显著高于60 cm以下土层。DTPA-Cu、Zn含量受土壤有机碳(SOC)和电导率(EC)的正向影响,受土壤pH的负向影响。SOC和pH是DTPA-Cu含量分布的主导影响因素,SOC是DTPA-Zn含量分布的决定性影响因子,土壤Zn/Cu受电导率(EC)、SOC及pH的综合影响,且均为正向影响。另外,DTPA-Cu、Zn含量还与土壤全N及速效N、P、K含量呈极显著的正相关关系,说明高量化肥和有机肥的施用导致设施土壤有效养分含量的同步增长。研究结果可为设施菜地养分管理提供数据参考。
英文摘要
Based on the greenhouse vegetable production base located in Damingtun Township, Xinming City, Liaoning Province, we selected upland and vegetable greenhouses of 2, 5, 10 and 15 years, respectively, collected samples from eight soil layers at the depth of 0-150 cm, and determined DTPA-extractable soil Cu and Zn and related chemical variables, and examined profile distribution of soil Cu and Zn and its leading affecting factors. Results showed that both DTPA-extractable Cu and Zn existed profile differentiation and accumulated in the surface layers, with the concentration greater in 0-60 cm layer than that in layers below 60 cm. Soil organic carbon (SOC) and electric conductivity (EC) had positive effect on DTPA-extractable soil Cu and Zn, while pH value had negative effect on DTPA-extractable Cu and Zn concentration. The leading factor that affected profile Zn distribution was SOC, and factors that affected profile Zn/Cu were EC, SOC and pH value. Furthermore, DTPA- Cu and Zn concentrations were positively and significantly correlated with total N and available N, P and K, indicating a synchronous increase in soil available nutrients induced by heavy application of both chemical and organic fertilizer under greenhouse vegetable cultivation. The results obtained are expected to provide data support for nutrient management of greenhouse soil.
DOI10.11924/j.issn.1000-6850.casb18060039