Growth Characteristics and Competitive Ability of Switchgrass and Alfalfa in Mixed Planting(PDF)
《北方园艺》[ISSN:1001-0009/CN:23-1247/S]
- Issue:
- 2016年03
- Page:
- 61-65
- Research Field:
- Publishing date:
Info
- Title:
- Growth Characteristics and Competitive Ability of Switchgrass and Alfalfa in Mixed Planting
- Author(s):
- GAO Yang1; AN Yu2; 3; WANG Zhifeng1; REN Wei1; XU Ankai1
- （1.Jilin Academy of Agricultural Sciences，Changchun，Jilin 130124；2.Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences，Changchun，Jilin 130102；3.College of Resource and Environment，Northwest Agriculture and Forestry University，Yangling，Shaanxi 712100）
- Keywords:
- switchgrass; alfalfa; mixed planting; biomass; interspecific competition; intraspecific competition
- PACS:
- -
- DOI:
- 10.11937/bfyy.201603017
- Abstract:
- Legumes and grass mixed planting is one of the main patterns of pasture.To understand the yield performance and competition of mixed pasture is significant for maintaining its stabile productivity.Switchgrass (Panicum virgatum L.) and alfalfa (Medicago sativa L.) were mixed planting at different densities in this pot experiment.Growth indexes of switchgrass and alfalfa were measured.Relative competition indices (RCI) and relative yield totals (RYT) were calculated to assess the effects of competition and production when the two species mixed planting.The results showed that the height of switchgrass and alfalfa had insignificant differences among planting density and forms which indicated slight effect from intra-and interspecific competition.The tiller number and aboveground biomass of switchgrass were decreasing with increase of planting density，but had insignificant difference between monoculture and mixed planting treatment under the same planting density (P>0.05)，showing that the above two indicators mainly affected by intraspecific competition.The belowground biomass of switchgrass，as well as stem diameter，root diameter，above-and belowground biomass of alfalfa were bounded by intraspecific and interspecific competition.Especially the root-shoot ratio of switchgrass and alfalfa，which dramatically decreased under low and high mixed planting density，indicated that the interspecific competition mainly impacted underground part of switchgrass and alfalfa.The RCI values of switchgrass were relatively small under low and medium mixed planting densities，while the RCI values of alfalfa were high under each density，suggesting that the growth of alfalfa was suppressed by switchgrass.Although there was interspecific competition between the two species in their mixtures，there was some degree of resource complimentarity (e.g.RYT>1).In conclusion，the results observed in the study should provide a new insight in optimizing the cultivation of artificial grasslands and facilitate prediction of biomass production.
Last Update: 2016-04-11