| Drought and soil erosion in the Loess Plateau coexist,grassland ecological ecosystems are seriously degraded.Reseeding is an effective way to control soil erosion,improve and repair degraded grassland.Legumes are not only of good quality,but also able to maintain water and soil,and replenish beans in grassland.The post-plant legume nutritive value is significantly higher than that of natural grassland;plant allelopathy is one of the reasons for the formation and succession of grassland community.Artemisia gmelinii is one of the dominant species in the succession process of the Loess Plateau,which can significantly affect plant seed germination,the amount of enzyme in growth and biomass.Therefore,the allelopathic effect of A.gmelinii on excellent leguminous plants was studied.Choosing suitable supplemental legume species for natural grassland with A.gmelinii could provide a reliable theoretical basis for improving the quality of natural grassland and reducing soil erosion.Plant allelopathy is one of the hotspots of ecological research.This paper uses a combination of germination and soil cultivate experiments to study allelopathy effects of Artemisia gmelinii on three common legumes of Onobrychis viciaefolia,Lotusc corniculatus and Medicago sativa in the Loess Plateau,by measuring seed germination?germination rate and germination potential?,seedling growth process?plant height,stem height,number of leaves and number of branches?,physiological traits?chlorophyll content,catalase?CAT?were measured.,malondialdehyde?MDA?,superoxide dismutase?SOD?and peroxidase?POD??,and ecological traits?biomass,root surface area,leaf area,and ground diameter?of three recipient plants.The results showed as follows:?1?The germination rate and germination potential of these legumes were all"low concentration promotion,high concentration inhibition".M.sativa and L.corniculatus were most suitable concentration at 1 g·L-1 in the extract of A.gmelini litteri,and O.viciaefolia were most suitable for growth at 10 g·L-1.?2?A.gmelinii on the growth of O.viciaefolia has a promoting effect or a small inhibitory effect,which means that the growth of O.viciaefolia under the influence of A.gmelini was better than that of M.sativa and L.corniculatus.?3?The physiological indicators allelopathic effects of different treatments A.gmelinii litter on M.sativa were inhibited,and the inhibitory effect was enhanced with the litter content increasing.However,both O.viciaefolia and L.corniculatus showed a promoting effect?P<0.05?at 30 g treatment.Under 60 g treatment,O.viciaefolia was significantly inhibited?P<0.05?and L.corniculatus were significantly promoted?P<0.05?.Both O.viciaefolia and L.corniculatus were inhibited in 90 g treatment.The promotion effect of O.viciaefolia was the strongest at the concertration of 30 g,but the effect of L.corniculatus was the strongest at the concertration of 60 g.?4?The ecological indexes of O.viciaefolia and L.corniculatus have facilitation at the treatment of 30g,and the comprehensive allelopathic effect of O.viciaefolia was greater than L.corniculatus.The order of the comprehensive allelopathic effect of the ecological index in 60g and 90g treatment is:M.sativa>L.corniculatus>O.viciaefolia,the differences reached a significant level in the each other.The ecological comprenhens ive allelopathic effects of the three legume grass are negative,which mean the ecological effect of A.gmelinii litter to O.viciaefolia was the lowest.The ecological indexes of M.sativa showed inhibition effects in different treatments.In conclusion,M.sativa was inhibited in all treatments,and the inhibition effects increased with the increasing of litter content.O.viciaefolia was more suitable for planting at concertration of 30g. |
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