表土剥离可识别土层的量化指标研究

Quantified Indicators of Recognizable Soil Layer in Topsoil Stripping

对建设占用耕地,进行表土剥离再利用是目前保证耕地数量、提高耕地质量的有效手段。该文对表土剥离中可识别土层的概念及相应的量化指标进行相关研究。得出:可识别土层包括耕作层(A)和犁底层(Ap);一般情况下,当可识别土层厚度达到25cm以上,且满足以下条件:没有受到污染、表土石砾含量小于10%、质地非松砂土、紧砂土及土壤可溶性盐含量(EC值)小于4 ds·m-1,即可认定该土壤可以剥离。

Topsoil stripping and reusing of farmland used for construction is the efficient measures to protect theamount of farmland and improve the quality of farmland. The definition of recognizable soil layer and correspondingquantified indicators in topsoil stripping are researched in this paper. Conclusions are as follows：Recognizable soillayer includes arable layer（A）and plow pan;Topsoil can be stripped,as a general rule,topsoil thickness of up to25 cm,and topsoil wasn＇t be polluted,gravel content in topsoil should be below 10 percent,soil texture is not loosesandy soil or tighten sandy soil and topsoils soluble salt（EC）is in below 4 ds·m-1.