耕地硬覆盖破坏程度划分标准研究——以沈阳市为例

Classification Criteria for Destruction Degree of Hard Covering on Cultivated Land-a Case Study of Shenyang City

耕地硬覆盖破坏是耕地破坏较常见的一种类型,研究耕地硬覆盖破坏程度划分标准,可以为完善耕地破坏鉴定标准和办法提供理论支持,也可以为管理部门开展耕地破坏鉴定实践工作提供一定参考。本文基于耕地硬覆盖破坏的内涵与形式,从耕地硬覆盖破坏对耕地种植条件尤其是土壤条件的影响及硬覆盖耕地恢复难易程度两个角度,以硬覆盖层性质、硬覆盖层厚度为划分指标,将耕地硬覆盖破坏程度划分为轻度破坏、中度破坏和重度破坏三种。研究结果表明:在沈阳地区,耕地表层土壤压实,无实质硬覆盖层者,属轻度破坏;硬覆盖层具有一定透水、透气性,不与表层土壤粘结,厚度小于10cm者,属中度破坏;硬覆盖层不具有透水、透气性,与表层土壤粘结,厚度大于或等于10cm者,属于重度破坏。

Hard covering destruction is a common destruction type of cultivated land.Studying the classification criteria of damage degree of hard covering on cultivated land can provide a theoretical support for improving the identification criteria and methods for cultivated land damage,and can provide a reference for management departments to identify the cultivated land damage.Based on the connotation and form of hard covering destruction on cultivated land,its influence on planting conditions,especially on soil conditions,and its restoration difficulty,the damage degrees of hard covering were divided into light damage,moderate damage and severe damage,taking the nature and the thickness of hard covering as the divided indices.The results showed that the surface soil of cultivated land in Shenyang was compacted and had no solid hard covering,which classified into slight damage.The hard covering less than 10 cm had a certain water and air permeability and did not adhere to the surface soil,which belonged to moderate damage.The hard covering without water and air permeability adhered to the surface soil,with the thickness greater than 10 cm,which belonged to severe damage.