[Seed flows of restoration succession series communities in alkaline meadow of Northeast China Songnen Plain].
After compared the source seed bank, soil seed bank, and seedling bank of the dominant species in four communities of restoration succession series in alkaline meadow of Songnen Plain, the model of seed flows was established. At early succession stage, the density of dominant source seed bank in Choris virgata community arrived its maximal value 446,182 +/- 180,455 seeds x m(-2) being 7.2 times of that in Puccinellia tenuiflora community at intermediate succession stage, 11.4 times of that in P. tenuiflora + Leymus chinensis community at later succession stage, and 164.8 times of that in L. chinensis community at climax succession stage. The densities of soil seed bank and seedling bank were all the maximal in C. virgata community, which were 63,650 +/- 14,541 seeds x m(-2) and 39,160 +/- 15,192 seedlings x m(-2), while the minimal in L. chinensis community, being 14,310 +/- 7,686 seeds x m(-2) and 790 +/- 745 seedlings x m(-2), respectively, representing a decreasing trend with the restoration. In the seedling banks of all communities in the restoration succession series, C. virgata was dominant, with its percentage ranged from 79.8% to 100%. In the seed flows, the input from dominant source seed banks to soil seed banks was only 10%-35%, while the output differed significantly at different succession stages, being the highest (62.3%) in C. virgata community and none in P. tenuiflora and L. chinensis communities.
College of Agronomy, Shenyang Agricultural University, Shenyang 110161, China. yanxuefei_0436@yahoo.com.cn
Xue-Fei
XF
Yan
Yun-Fei
YF
Yang
D044822:Biodiversity; D002681:China; D017753:Ecosystem; D004784:Environmental Monitoring; D006109:Poaceae / Q000254:growth & development*; D012639:Seeds / Q000254:growth & development*; D012987:Soil / Q000032:analysis*
D012987:Soil