Effects of monoculture-conditioned soils on common tallgrass prairie species productivity  

作　　者：Thomas P.McKenna Brian J.Darby Kathryn A.Yurkonis 

机构地区：[1]Kansas Biological Survey,University of Kansas,2101 Constant Ave.,Takeru Higuchi Hall,Lawrence,KS 66047,USA [2]Department of Biology,University of North Dakota,10 Cornell Street Stop 9019,Grand Forks,ND 58202,USA

出　　处：《Journal of Plant Ecology》2019年第3期474-484,共11页植物生态学报（英文版）

摘　　要：Aims Within biodiversity-ecosystem function experiments,it is widely understood that yields of some species rapidly decline when planted in monoculture.This effect may arise due to decreased access to soil nutrients or an increase in detrimental soil patho-gens within monoculture plantings.To determine whether or not soil conditioning affects tall grass prairie species biomass produc-tion,we conducted a field experiment to assess species growth in conspecifically and heterospecifically conditioned soils and a greenhouse experiment to elucidate how conspecific soil biota affected species growth.Methods To test for species-specific soil effects,seedlings of the legume Astragulus canadensis,the cool-season grass Elymus canaden-sis,the forb Helianthus maximiliani and the warm-season grass Panicum virgatum were grown in field plots that had either been conspecifically or heterospecifically conditioned over 2 years.Plant growth was recorded over a single growing season,and soils were assessed for differences in their nematode(mesofauna)communities.Seedlings of these species were additionally grown over a 6-week period in conspecifically conditioned soil that was either untreated,heated to 60°C,sterilized(autoclaved at 120°C)or heated to 60°C and reinoculated with conspecific soil biota.The two heating treatments were used to compare growth responses between a low-and high-temperature soil treatment.The reinoculation treatment was used to assess the effect of soil biota in light of any nutrient changes that may have occurred with soil heating.Important Findings Elymus canadensis,H.maximiliani and P.virgatum growth was improved in field plots conditioned by the legume A.canadensis com-pared with their growth in conspecifically conditioned(home)soils.Despite variation(grass versus nongrass)in their soil nematode com-munities,there was no evidence to suggest that these three species were inhibited by conspecific or functionally conspecific soil condi-tioning in the field.Astragulus canadensis was the only species whose

关 键 词：Astragulus canadensis DIVERSITY Elymus canadensis Helianthus maximiliani MONOCULTURE OVERYIELDING Panicum virgatum PRODUCTIVITY soil biota soil conditioning 

分 类 号：S15[农业科学—土壤学]