Spatial distribution,biomass,and soil seed bank of a naturalized population of alfalfa in native mixed‐grass prairie

摘要：

The occurrence of naturalized yellow‐flowered alfalfa ( YFA) ( Medicago sativ a subsp.f alcata) on private and adjacent public rangeland in northwestern South Dakota, USA presents a dilemma.The capacity for natural reseeding demonstrates value for rehabilitating depleted rangelands by increasing soil organic C and N and forage production ( Smith 1997).However, spread of YFA in native rangeland potentially threatens native biological diversity and may result in changes in ecological processes and stability.Study objectives were :1) to describe spatial distribution patterns of YFA,2) to determine associations between YFA occurrence and species richness and biomass production of native plant communities, and 3 ) to examine density and viability of seed bank of YFA.

关键词： alfalfa biomass seed bank mixed‐grass prairie

作者: L.Xu A.Boe R.N.Gates P.S.Johnson Y.Zhang

作者单位: Department of Biology and M icrobiology Department of Plant Sciences Department of Animal and Range Sciences,South Dakota State University,Brookings,SD 57007,USA Department of Grassland Science,China Agricultural University,No.2 Yuanmingyuan West Rd.Haidian Dist

会议类型: 国际会议

会议名称: 2008世界草地与草原大会

会议地点: 呼和浩特

会议语种:英文

在线出版日期: 2008-06-29（万方平台首次上网日期，不代表论文的发表时间）