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Chinese Agricultural Science Bulletin ›› 2023, Vol. 39 ›› Issue (18): 81-85.doi: 10.11924/j.issn.1000-6850.casb2022-0527

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Study on Evolution Characteristics and Mechanism of Soil Structure in the Coastal Area of Eastern Zhejiang Province

TAO Juanhua1(), SHI Qiwei1, WU Shaofu2, ZHANG Mingkui3()   

  1. 1 Keqiao District Agricultural and Fishery Technology Extension Station of Shaoxing, Shaoxing, Zhejiang 312030
    2 Shaoxing Grain and Oil Crop Technology Extension Center, Shaoxing, Zhejiang 312000
    3 College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058
  • Received:2022-06-22 Revised:2022-09-03 Online:2023-06-25 Published:2023-06-25

Abstract:

To understand the change characteristics of soil structure in the process of reclamation and utilization of coastal land, we took Yueqing Bay in southern Zhejiang and Hangzhou Bay in northern Zhejiang as the research objects, conducted physical and chemical analysis of the soils with different reclamation time and incubation experiments by adding salt and organic fertilizer and dry-wet alternation, to explore the evolution and formation mechanism of soil structure in the coastal land of Zhejiang Province. The results showed that from coastal saline soil to fluvo-aquic soil to paddy soil, with the increase of reclamation time and the change of land use, the soil structure changed from loose single grain to weak block structure, and finally evolved into stable block structure, the amount of > 0.25 mm water stable aggregates increased significantly, and the particle size of water stable aggregates also gradually increased. The results of both incubation experiments and soil analysis showed that the dry-wet alternation and soil desalination were the key factors for the rapid increase of water stable aggregates from intertidal beach saline soil to coastal saline soil, while the accumulation of organic matter and cultivation maturity were the main reasons for the gradual increase of water stable aggregates from coastal saline soil to fluvo-aquic soil to paddy soil.

Key words: coastal plain, aggregates, desalination, alternation of dry and wet, reclamation time, utilization mode, change law