Evaluation Of Soil Quality And Economic Benefit Of Different Agroforestry Models In Yellow-flooded Sandy Land

The alluvial plain in the middle and lower reaches of the Yellow River is an important grain producing area in my country,and the forest-agricultural complex management is one of the main management modes of forestry production in the region,It plays an important role in the improvement of ecological and economic benefitssuch as windbreak and sand fixation,soil improvement,microclimate improvement,carbon fixation and oxygen release.In order to reveal the differences in soil physical and chemical properties,soil quality and economic benefits of different agricultural and forestry intercropping models in the Yellow Plains,In this paper,the state-owned Dongming Forest Farm in Shandong Province was used as the control,and the intercropping patterns of ash-chrysanthemum,ash-peanut,ash-soybean,poplar-wheat,poplar-peanut,poplar-cassia seed were the research objects,Using a combination of field sampling and laboratory experiments,the changes of soil physical and chemical properties and carbon storage in different agroforestry intercropping models were studied,and thesoil quality and economic benefits of the intercropping models were quantitatively evaluated,in order to obtain a suitable model to guide the intercropping of agricultureand forestry in this area.Provide reference for the high-quality development of agriculture and forestry in the sandy area of yellow flood plain.The main results are as follows :(1)The soil physical properties of different agro-forestry intercropping models in the yellow sandy land are different.The ash-peanut intercropping model is more likely to increase soil sand content.Poplar-wheat,ash-soybean intercropping mode can significantly reduce soil bulk density in 0-20 cm soil layer,The total soil porosity and capillary porosity have the most obvious changes in the 20-40 cm soil layer.Compared with other planting modes,ash pure forest planting mode can effectively reduce soil compaction of 20-40 cm soil layer and increase capillary porosity.(2)The soil p H value of each intercropping mode is evenly distributed between 7.28-8.60,Among them,the poplar-wheat intercropping mode had the highest p H,but the overall soil p H changed little under different intercropping modes.Soil organic carbon,total nitrogen content and carbon storage all showed surface aggregation,and the content showed a decreasing trend with the increase of soil depth.In the 0-40 cm soil layer,the poplar-wheat intercropping mode is more likely to increase soil surface organic carbon and organic carbon storage,and improve soil carbon sequestration capacity.The contents of total phosphorus and total potassium in the soil did not change significantly in the 0-60 cm soil layer.(3)Principal component-cluster analysis was performed on 15 soil indicators of different agroforestry intercropping patterns,and the soil quality scores were ranked as follows: T4(poplar-wheat)> T3(white wax-soybean)> CK2(poplar pure forest)> CK1(white wax pure Lin)> T5(Poplar-Peanut)> T1(Pash-Chrysanthemum)> T6(Poplar-Cassia)> T2(Pash-Peanut).(4)Using static evaluation indicators to analyze the economic benefits of different agro-forestry intercropping modes of ash and poplar during the rotation period:Among the ash intercropping mode,the ash-soybean intercropping mode has the highest input-output ratio and capital profit rate,which can be used as the preferred model;Among the different agroforestry modes of poplar,the poplar-wheat intercropping mode has the highest input-output ratio and capital profit rate,and can be used as the preferred mode.(5)Based on the improvement of soil quality and economic benefits,it can be seen that the two intercropping methods of ash-soybean and poplar-wheat can better improve soil quality and obtain better economic benefits.