科尔沁沙地典型人工固沙林群落中少花蒺藜草入侵地土壤特性

Soil Nutrients of CenchrusPauciflorusin the Artificial Sand-Fixation Forest Community of Horqin

对科尔沁沙地2个典型人工固沙林小叶杨（Populus simonii）和黄柳（Salix gordejevii）群落中优势种少花蒺藜草（Cenchrus pauciflorus）生境地土壤养分进行测定分析.结果表明：少花蒺藜草2生境地中土壤pH值在7.35～7.80之间,土壤有机质含量在4.86～5.90 mg·kg-1之间,碱解氮含量在21.4～59.07 mg·kg-1之间,有效磷含量范围为1.13～2.22 mg·kg-1,速效钾含量在78.24～173.20 mg·kg-1之间.土壤有机质及速效养分含量随着少花蒺藜草生长期的变化均有不同程度的下降,入侵地土壤沙化加重.

Field sandbur soil nutrients were determined in the different artificially sand-fixation forests of Populus simonii and Salix gordejevii habitats in Horqin.The results showed that the soil pH values of two tested habitats were 7.35～7.80,soil organic matter contents were 4.86～5.90 mg · kg-1,alkali solution N content were 21.4～59.07 mg · kg-1,effective phosphorus contents were 1.13～2.22 mg · kg-1,rapidly-available potassium contents were 78.24～ 173.20 mg · kg-1.In the whole growth process,soil nutrients reduced in different rates.The soil desertification increased with the growth of field sandbur.