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| Microscale spatial variability of soil salt content in coastal salinized farmlands in autumn |
| Received:September 02, 2021 |
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| KeyWord:coastal;saline farmland;micro-scale;soil salinity;variability |
| Author Name | Affiliation | E-mail | | ZHAO Yongchang | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | | | CHANG Chunyan | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | chyan0103@sdau.edu.cn | | WANG Zhuoran | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | | | WANG Qiyao | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | | | YANG Jingwen | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | | | ZHANG Shuwei | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | | | LI Yinshuai | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | | | ZHAO Gengxing | College of Resources and Environment, Shandong Agricultural University/National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai'an 271018, China | zhaogx@sdau.edu.cn |
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| Abstract: |
| 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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