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Gansu Agricultural University (2020)

Effects of Soil Environment Regulation on Water Absorption and Utlilzation of Lycium Barbarum L. in Arid Regions

胥生荣;

Titre : Effects of Soil Environment Regulation on Water Absorption and Utlilzation of Lycium Barbarum L. in Arid Regions

Auteur : 胥生荣;

Grade : Doctoral Dissertation 2020

Université : Gansu Agricultural University

Résumé partiel
Lycium Barbarum L.is a perennial deciduous shrub belonging to the Solanaceae family.It plays important roles in improving soil structure and fertility,reducing harm caused by salt and alkaline conditions,thus is a good plant to control the desertification of land,and is an important medicinal plant.Here,the methods of field plot experiments and pot simulation experiments were combined to study the water use and regulation characteristics of Lycium Barbarum L.This study aimed to systematically investigate the physiological and ecological mechanisms of water absorption,transportation,and utilization by Lycium in an arid farmland ecosystem,to provide an important scientific basis for farm operations and cultivation of new varieties resistant to drought in arid and semi-arid regions.1.The physiological activity of roots and their distribution can reflect the ability of plants to absorb soil water and the source depth of the water absorbed in the soil.The average root activity of wolfberry plants decrease year by year as they age,and the relative root conductivity increases with the age of the plants.The root activity and relative electrical conductivity of plants treated with plastic film mulch increased to 110.2%and 106.9%that of the control,respectively.The root activity of plants treated with straw mulch increased to 104.4%of that of the control,while the relative electrical conductivity of plants treated with straw mulch decreased to 74.4%that of the control.Plastic film mulch treatment can increase the proportion of fine root biomass in the soil,20 to 60 cm deep,in 4-year old plants,comprising more than 60%of the total fine root biomass.With the increasing age of plants,the main fine roots gradually spread outward and become mainly distributed at a distance of between 0and 60 cm away from the stem.Both plastic film mulch and straw mulch treatment resulted in the gradual expansion of the fine roots,and the fine root biomass increased to 117.8%and 110.0%of the control at a distance of 40 to 60 cm from the stem,respectively.2.The water transport rate is directly affected by a plant’s hydraulics.Drought stress increased the ratio of root–plant hydraulic resistance from 40.9%to 59.3%,with the variation range in root specific conductivity being significantly greater than that of canopy specific conductivity.The contribution rate of aquaporins to hydraulic conductivity was greater than 49.7%in the roots,and the root specific conductivity under moderate and severe drought stress decreased to 64.66%and 68.99%,respectively,following treatment with mercury chloride.Plastic film mulch and straw mulch treatment increased the average specific conductivity of roots to 109.95%and102.78%of the control,respectively.The P500 value of xylem gradually decreased from-1.259 MPa to-1.379 MPa as the nitrogen content increased,and the threshold value decreased from-0.82 MPa to-1.06 MPa when the water potential of the xylem vessel decreased significantly.

Mots clés : Arid region; Lycium Barbarum L.; Soil environment; Hydraulic conductivity; Water;

Présentation (CNKI)

Page publiée le 22 octobre 2020, mise à jour le 22 octobre 2021