| 摘要: |
| 【目的】研究陕西渭北地区土壤电导率动态变化及其影响因素，旨在为渭北地区土壤盐碱化治理提供理论依据。【方法】在陕西渭北土壤盐碱化集中的区域富平县、临渭区、蒲城县、大荔县、合阳县共选择28个农田土壤作为监测点，按土壤表层盐分含量的高低，分为高含盐量区和低含盐量区，分别于2015年8月（夏季）、2015年11月（秋季）、2016年2月（冬季）、2016年5月（春季）测定监测点土壤电导率、含水量和温度。【结果】1）土壤电导率在高含盐量区年内动态变化为夏季>春季>秋季>冬季，在低含盐量区动态变化为春季>夏季>秋季>冬季；高含盐量区受水分、温度、海拔和是否灌溉各因素综合影响，低含盐量区受温度和海拔影响较大。2）年内土壤剖面上，温度对电导率的影响大于水分对电导率的影响，且温度的影响程度随土层深度的增加呈减小趋势，水分的影响程度随土层深度的增加呈增加趋势。3）夏、春、冬季土壤电导率受水分的影响较大，年内土壤含水量在15%~30%时对土壤电导率有明显影响。【结论】渭北地区剖面土壤电导率在各季节间存在差异，四季内的主要影响因素是水分，土壤剖面中的主要影响因素是温度和水分。 |
| 关键词: 土壤电导率 年内动态 土壤盐碱化 渭北地区 |
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| 基金项目:中国科学院重点部署项目（KJZD-EW-TZ-G10）；国家科技基础性工作专项(2014FY210100) |
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| Seasonal changes and influencing factors of soil electrical conductivity in soil profile of Weibei region |
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FAN Huimin,ZHANG Rongrong,XU Mingxiang,et al
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| Abstract: |
| 【Objective】Changes and the influencing factors of soil electrical conductivity in soil profile of Weibei region were investigated to provide basis for soil salinization governance in the region.【Method】A total of 28 farmland soil monitoring sites were selected in Fuping,Linwei,Pucheng,Dali and Heyang, where soil salinization was concentrated in Shaanxi.According to surface soil salt content,the study areas were divided into high salt content and low salt content areas.Soil electrical conductivity,water content and temperature were measured in August 2015 (summer),November 2015 (autumn),February 2016 (winter), and May 2016 (spring).【Result】1) The soil electrical conductivity in high salinity area was in the order of summer >spring>autumn>winter,and in the low salinity area was in the order of spring>summer>autumn>winter.High salinity area was affected by various factors including water content,temperature,altitude and irrigation while low salinity area was greatly influenced by altitude and temperature.2) Compared with soil water,temperature was more important in influencing electrical conductivity in soil profiles.The influence of temperature reduced with the increase of soil depth,while the influence of water increased with the increase of soil depth.3) In summer,spring and winter,soil electrical conductivity was primarily influenced by water content,especially when water content was in the range of 15%-30%.【Conclusion】Great difference in soil electrical conductivity was observed among different seasons and soil layers,and soil water content and temperature were the main influencing factors. |
| Key words: soil electrical conductivity seasonal variation land salinization Weibei region |
