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Northwest A&F University (2020)

Ecological and Hydrological Processes and Simulation of the Jujube Agroforestry System in the Loess Hilly Region


Titre : Ecological and Hydrological Processes and Simulation of the Jujube Agroforestry System in the Loess Hilly Region

Auteur : 凌强;

Grade : Doctoral Dissertation 2020

Université : Northwest A&F University

Résumé partiel
The intercropping compound system has the effects of changing the soil microenvironment,preserving soil moisture,reducing soil evaporation,and changing the microclimate of the system,but it also has problems of excessive water consumption and water competition.However,the feasibility study of implementing intercropping compound management in dryland orchards is weaker.In the loess hilly region,precipitation is the only source of agriculture and vegetation growth.The long-term plowing management of rain-fed jujube gardens has caused serious problems such as land degradation and soil erosion,affecting the economic benefits and ecological functions of jujube gardens.Therefore,in this study,economic crop canola and daylily were introduced into the rain-fed jujube orchard in the loess hilly region,and two types of intercropping system were constructed.Through continuous monitoring of soil moisture,orchard evapotranspiration,and fruit tree growth for 4 consecutive years,as well as soil physical and chemical characteristics and fine root distribution and other determinations were conducted to systematically study the effects of intercropping of red jujube forests on the physical and chemical characteristics of the orchard soil,root system distribution,profile soil moisture,and orchard transpiration dynamics,and evaluate the water use status and ecological benefits of the two intercropping complex systems.(1)The effects of crop intercropping on the soil quality of the jujube forest complex system were clarified.Compared with the control,under the canopy of jujube trees,the field water holding capacity of canola treatment and daylily treatment soil increased by 3.4%and 2.3%respectively ;soil available phosphorus content decreased by 31.7%and 33.4%respectively ;soil cation exchange increased by 28.6%and 17.0%.Between rows,the soil bulk density of canola treatment and daylily treatment decreased by 5.5%and 2.9%respectively ;soil field water holding capacity increased by 11.9%and 9.4%respectively ;soil saturated hydraulic conductivity increased by 29.1%and 27.2%respectively ;soil available nitrogen respectively Increased 167.0%and 78.7% ;soil organic carbon content increased by 53.4%and 36.1%respectively ;soil cation exchange capacity increased by 12.3%and decreased by 3.9%,respectively.(2)The synergistic relationship between soil water regulation effect and inter-species water competition in the jujube forest intercropping complex system was proved.Under the canopy of the jujube tree,the soil moisture content in the 0-60 cm soil layer of the two intercropping systems was significantly higher(p<0.05)than the control treatment.Between rows of jujube trees,the soil moisture content of the two intercropping systems and the 0-60cm soil layer was significantly higher during the study period(p<0.05)than the control treatment ;but the soil moisture content of the 60-180 cm soil layer of the daylily intercropping composite system was significant.Low(p<0.05)in the control treatment,and the compound system of feed and rape intercropping was significantly lower than(p<0.05)in the control during 2015-2017.A soil water relative differential index(SWDR)was constructed to determine the occurrence and strength of soil water competition.There was no significant soil water competition between jujube trees and canola during the study period,while serious differences existed between jujube trees and daylily.Water competition

Mots clés : The Loess Plateau; Agroforestry system; Jujube; Soil moisture; Jujube transpiration;

Présentation (CNKI)

Page publiée le 15 juin 2021