natural moisture content造句

• It is analyzed that the impacts of vegetation type on shear strength of unsaturated soil through direct shearing tests for unsaturated soil of different depth and various vegetation types which consist of hare soil , tanglehead grassplot , switch sorrel shrubbery and eucalyptus holt under natural moisture contents
  摘要通过对裸地、扭黄茅草地、车桑子灌木林地和按树林地四种不同植被类型、不同深度土壤在天然含水量情况下的直剪试验，研究了植被类型对非饱和土抗剪强度的影响。