Study on Allelopathy of Stellera Chamaejasme of Horqin Grassland
|Keywords||Horqin grassland Stellera chamaejasme Allelopathy Physiological indicators Soil degradation|
The of Stellera chamaejasme big expansion on degraded grassland in the north of poisonous plants plays an important role in the ecosystem , grassland degradation . From the perspective of allelopathy substances within stellera chameajasme were extracted with water and ethanol solvent . The the two extracts two stellera chamaejasme associated plants ( Salicornia the dish , Arthraxon grass ) seed germination and seedling growth ; comparative analysis of soil samples were collected at the same time of Stellera chamaejasme rhizosphere and non - rhizosphere soil nutrient content and changes in soil microbial activity . The results showed that water and ethanol stellera chameajasme two extraction dope produce significant inhibition of of bedstraw and Arthraxon grass seed germination rate and germination process , dope strongest inhibition reduced as the concentration inhibition reduced ; stronger inhibitory effect on the ethanol extract of water extract . Processing of the extract , the seed germination process in proline content improved soluble protein and soluble sugar content decreased , indicating that the physiological and metabolic functions extract can inhibit the germination of seeds ; the seedling tissue malondialdehyde (MDA) content , superoxide dismutase (SOD) activity increased, indicating that the plant extract allelopathy stress reaction . The of Stellera chamaejasme accompanying plant allelopathy is one of the reasons causing degradation of the grassland vegetation . Of Stellera chamaejasme growth process can cause reduced 0-30 cm rhizosphere soil nutrients N , P , K and organic matter content , soil microbial biomass C , N and P content decreased soil hydrolase ( phosphomonoesterase , urease, protease and invertase ) and oxidoreductase ( dehydrogenase , polyphenol oxidase and nitrate reductase ) activity decreased . The decrease in the 5-30 cm soil layer was significantly higher than the surface layer of 0-5 cm . Show that the the circulation slows rhizosphere soil nutrient elements of Stellera chamaejasme growth , soil microbes reduce the number of declining soil fertility , decreased activity , which is one of the main reasons the grass stellera chamaejasme soil degradation .