应用生态学报2017，Vol.28Issue(5)：1522-1532,11.DOI:10.13287/j.1001-9332.201705.040
少花蒺藜草入侵对沙质草地氮库的影响
Effects of invasive Cenchrus spinifex on nitrogen pools in sandy grassland
摘要
Abstract
Cenchrus spinifex is an invasive plant found in large areas of northern China.In this study,we focused on analysis of the effects of C.spinifex on soil nitrogen and plant nitrogen pools in Horqin sandy grassland.In addition,a pot experiment with 15N tracing techniques was designed to study the biological nitrogen fixation ability of C.spinifex,compared with two native grasses,Elymus dahuricus and Agropyron cristatum.The total soil nitrogen pool in C.spinifex invaded-area increased significantly by 47.5％ and 20.8％,and the soil ammonium nitrogen pool decreased significantly by 25.6％ and 25.2％,compared with those in bare and native plant Roegneria kamoji areas,respectively.The plant shoot nitrogen pool decreased significantly by 18.7％ in C.spinifex compared with native plant R.kamofi.Atom％ 15N,atom％ 15N excess and atom％ 15N weighting excess of C.spinifex were all significantly lower than those of E.dahuricus and A.cristatum.The nitrogen use efficiencies of C.spinifex and E.dahuricus were 48.5％ and 47.0％,respectively,and no significant difference was observed.Ndfa of C.spinifex accounted for 60.2％,when growing together with E.dahuricus.These results suggested that the characteristics on the high efficient use for nitrogen of this invasive weed might an ecological adaptation mechanism,leading to successful colonization and spread in Horqin Steppe.关键词
少花蒺藜草/土壤氮库/植物氮库/生物固氮Key words
Cenchrus spinifex/soil nitrogen pool/plant nitrogen pool/biological nitrogen fixation引用本文复制引用
张婷,付卫东,张瑞海,宋振,柏超,黄成成,张国良..少花蒺藜草入侵对沙质草地氮库的影响[J].应用生态学报,2017,28(5):1522-1532,11.基金项目
本文由国家重点研发计划项目(2016YFSF03)资助 This work was supported by the National Key Research and Development Program (2016YFSF03). （2016YFSF03）
