Research On Interspecific Relationship Of Agroforestry Compound Ecosystem In The Area Of Western Liaoing

In the research, apricot-peanut, apricot-corn, southland pear-peanuts and southlandpear-corn of four typical agroforestry ecosystem are taken as the objects of study in hilly regionof western Liaoning Province, also picking peanut and corn monoculture as a contrasting studyobject, according to the allelopathy in compound ecosystem, which is researched frommicroclimate factor aboveground and part of soil moisture, soil nutrient, soil enzyme activity andyield underground. Variation law of each Influencing factor between. fruit tree and crops isresearched from the seasonal and spatial.It is shown that: interspecific allelopathy results demonstrate that leaf extract allelopathiceffect is the strongest among the apricot and southland pear’s root, stem, leaves in differentconcentrations of the extract; among peanut, corn and soybean three receptor seeds, it is theweakest for peanut seeds from plants allelopathy.Studies have also shown that, compound ecological system can effectively improve themicroclimate conditions,propitious to reduce the wind speed and air temperature, raise the airrelative humidity, but the fruit tree-branches and leaves play a shading effect on crops causingcertain effect on crop yield. It is stronger for apricot compound system in the improvement offarmland system small climate than southland pear compound system, also peanut systemmicroclimate changing values are better than maize system.The study on soil moisture content in different seasons shows that, composite system of soilmoisture content vary differently, and soil moisture variation coefficient first decreases and thenincreases with the soil depth increasing in the vertical direction. For soil nutrient status and soilenzyme activity of the compound system all show that the surface (0-20cm) of soil nutrients andenzyme activity were higher than that in deep soil (20-40cm). Correlation analysis show that, thesoil enzyme activity are negatively correlated with soil water content, positively related with thesoil nutrients,which can be used to evaluate soil quality and soil fertility; composite system caneffectively improve the efficiency of land use, but the interspecific competition can reduce thecrop production.The research using the method of principal component analysis on underground part ofinterspecific relationship shows that monocropping system part of underground interspecificrelationships are better than intercropping system, apricot intercropping system part ofunderground interspecific relationships are lower than those of southland Pear intercropping system. This is mainly because the fruiter cultivating exacerbates the competition compoundecosystem of interspecific; Apricot ’s physiological characteristics is stronger than southland pearon the competition of soil water and nutrient conditions.