| 赵永昶,常春艳,王卓然,王启尧,杨婧文,张术伟,李因帅,赵庚星.滨海盐渍农田秋季土壤盐分含量微域变异特征[J].农业环境科学学报,2022,41(5):1009-1021. |
| 滨海盐渍农田秋季土壤盐分含量微域变异特征 |
| Microscale spatial variability of soil salt content in coastal salinized farmlands in autumn |
| 投稿时间：2021-09-02 |
| DOI：10.11654/jaes.2021-1011 |
| 中文关键词: 滨海 盐渍农田 微域 土壤盐分 变异 |
| 英文关键词: coastal saline farmland micro-scale soil salinity variability |
| 基金项目:国家自然科学基金项目（41877003）；山东省重大科技创新工程项目（2019JZZY010724）；山东省“双一流”奖补资金（SYL2017XTTD02） |
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| 中文摘要: |
| 为研究微域尺度滨海盐渍农田土壤盐分变异特征，探究盐渍农田农艺避盐对策，本研究选取利津县和垦利区典型滨海盐渍农田，划分受微地形、紧实度和覆盖状况影响下的典型微区，在秋季野外实地调查采样的基础上，通过统计分析、实地观测、方差分析和数据分析对比等方法，分析了研究区秋季土壤盐分的微域变异特征。结果表明：试验区为轻、中度盐渍化农田，土壤表层盐分微域变异特征受微地形、紧实状况、覆盖状况影响，且各微区变异系数最高可达21.0%，呈中等程度变异；在微域尺度下，麦田不同微地形影响下土壤盐分含量垄间坡顶处较垄沟低洼处平均提高18.6%，不同紧实状况影响下土壤盐分含量紧实处较松散处平均提高44.7%；玉米田不同杂草覆盖土壤盐分含量裸露处较杂草茂盛处平均提高30.8%，地膜覆盖土壤盐分含量膜外较膜内平均提高44.7%；棉田地膜覆盖土壤盐分含量膜外较膜内平均提高31.5%。研究表明，土壤含盐量随微地形由低到高、紧实状况由松散到紧实、杂草覆盖状况由密到疏、地膜覆盖状况由膜内到膜外而逐渐升高。 |
| 英文摘要: |
| This study investigated the variation characteristics of soil salinity in micro-domain coastal saline farmland and the countermeasures of salt avoidance in agricultural practices of saline farmland. Typical inshore saline farmlands in Lijin County and Kenli district were selected. Under the typical influences of the microdomain, including microtopographies, compactness and coverage conditions, variation characteristics in the saline soil salinity microdomain were studied during autumn. This was done through field observations and investigations, sampling, data collection, and statistical analysis of the data of the studied area. The results showed that the experimental area was a lightly or moderately salinized farmland. The variation characteristics of the saline soil surface microdomains were affected by the microtopography and compaction and cover condition. The maximum variation coefficient of each microregion was 21.0%, most of which showed moderate variation. At the micro-scale, soil salt content at the highest point of the ridge increased by 18.6% on an average compared with that at the foot of the hill, indicating the influence of microtopography. The soil salt content of tight and loosely compacted areas differed by 44.7% on an average, highlighting the influence of different compaction conditions. In maize fields, the salt content in exposed soil was 30.8% on an average higher than that in overgrown soil, and the salt content in soil not covered with a plastic film was 44.7% on an average higher than that under a plastic film. In cotton fields, the salt content in soil not covered with a plastic film was 31.5% on an average higher than that under a plastic film. The soil salt content increased gradually with the change of microtopography from lowto high-elevation, compactness from loose to compacted, weed mulching from dense to sparse, and mulching from inside to outside the film. In this study, the understanding of the microdomain variation characteristics of saline soil in the study area during the salt accumulation period in autumn was improved. |
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