The Effect Of Eucalyptus With Agroforestry Management Modes On Soil Physical And Chemical Properties And Enzyme Activity

Interplanting crops under Eucalyptus can not only effectively improve land utilization efficiency,improve soil fertility,promote forest growth and increase economic income,but also effectively alleviate the negative effects of Eucalyptus pure forest and realize the win-win of ecological and economic benefits.The Agroforestry Management Model of Eucalyptus plantation is an important issue to be solved urgently.In this paper,Eucalyptus Plantation was taken as the research object in Zhengning,Anshun.Pisum sativum 、 Raphanus sativus 、 Brassica pekinensis 、Allium fistulosum 、Allium sativum were intercropped under Eucalyptus plantation,and taking Eucalyptus pure forest as the control,this paper discusses the effects of different crops on soil physical and chemical properties and soil enzyme activity of Eucalyptus plantation,in order to screen out the agroforestry compound management model suitable for popularization and application in this region,and provide a scientific theoretical basis for the rational management of Eucalyptus plantation.The results indicated that:(1)Eucalyptus Plantation Agroforestry Management can effectively improve soil physical properties.Intercropping crops under Eucalyptus plantation,the soil bulk density in surface of intercropping forest decreased significantly;The total soil porosity,capillary porosity,non capillary porosity,maximum water holding capacity,capillary water holding capacity and non capillary water holding capacity of the topsoil of Eucalyptus Plantation increased significantly.It shows that the Agroforestry Management of Eucalyptus Plantation improves the soil porosity and the water holding capacity of forest land,The improvement effect of Eucalyptus-Pisum sativum,Eucalyptus-Brassica pekinensis,Eucalyptus-Allium fistulosum,Eucalyptus-Raphanus sativus and Eucalyptus-Allium sativum complex manageent modes on soil physical properties is mainly concentrated in the surface layer(0 ～ 20 cm soil layer),while there are differences in soil physical properties under five different agroforestry compound management modes.(2)Agroforestry Management of Eucalyptus plantation can effectively improve soil chemical properties.Soil organic carbon,total N,alkali hydrolyzable nitrogen,total P,available phosphorus,available potassium The content of total K(except Eucalyptus-Pisum)is higher than that of Eucalyptus pure forest,and there is a very significant difference between each compound management model;the soil p H value of intercropping decreases,but the change range is small,which may be related to the short growth cycle of intercropping plants.In general,the soil chemical properties of intercropping forest land have been improved by implementing Agroforestry Management of Eucalyptus Plantation.(3)Agroforestry Management of Eucalyptus plantation can improve soil enzyme activity.The activities of soil protease,urease,sucrase and catalase under the five Agroforestry Management Modes of Eucalyptus plantation are significantly higher than those of Eucalyptus pure forest,and there are very significant differences among the agroforestry management modes;Only the soil acid phosphatase activity of Eucalyptus-Pisum and Eucalyptus-Allium fistulosum compound management model are lower than that of pure forest,which may be related to soil p H value and intercropping crops.In general,the Agroforestry Management of Eucalyptus Plantation plays an important role in improving enzyme activity.(4)Intercropping Leguminosae,Cruciferae and Allium under Eucalyptus plantation can effectively improve soil properties and soil enzyme activity.In particular,the comprehensive effect of Eucalyptus-Pisum sativum,Eucalyptus-Raphanus sativus and Eucalyptus-Allium sativum compound management model on soil physical properties,soil nutrient content and soil enzyme activity is the best.Therefore,the Eucalyptus-Pisum sativum,Eucalyptus-Raphanus sativus and Eucalyptus-Allium sativum compound management model can be demonstrated,popularized and applied under Eucalyptus Plantation in the experimental area.