| Glycyrrhiza uralensis is an important medicinal plant, growing in dry area of northern China, and its vegetation plays a significant role in ecological protection. Recently over-dug made natural distribution G. uralensis resources is facing with dying out and brought out ecological environment deterioration as well. C. microphylla and G. uralensis may form natural mixed community, whose compound planting is helpful for protection and extension G. uralensis resources and restoration deteriorated vegetation in the dryland zone of western China. In order to find good mode based on water and nutrient competitive mechanism of C. microphylla and G. uralensis, physiological traits were studied by PV technique etc.; by the way of root barrier, interspecies interaction of C. microphylla and G. uralensis and effects on G. uralensis quality were studied; Effect of fertilizer and water on interspecific interaction was explored by fertilization and controlled water. Results were as following:(1) C. microphylla and G. uralensis had different water physiological traits. The whole drought-resistance of G. uralensis is stronger than C. microphylla. Branch water potential, root and leaf water retention capability of C. microphylla was lower than G. uralensis. Branch mean turgor pressure, modulus of elasticity and water retention capability of C. microphylla were bigger.(2) C. microphylla and G. uralensis had different photosynthesize traits. Their compound system can make full use of light energy. C. microphylla had a higher light energy turning and water untility effiency. Pn, Tr of G. uralensis is higher. Light compensation points of C. microphylla were higher and light saturation point lower. Ability of using weak and stronger light of G. uralensis was stronger, which was fit for closed planting and mixed planting.(3) Minal nutrient traits were different between C. microphylla and G. uralensis. They were different in absorbing mineal elements, which may make full use of nutrient resources.(4) G. uralensis grew best with most GA content under root complete barrior. No barrier and half barrier made GA content decreased. In mesh room RYT=1.95-2.03, CRA= 1.68-2.01. They had different niches, which were adequate for compound planting. In practice two should keep appropriate distance in compound planting.(5) Fertilizers adjusted biomass allocation law and adjusted interspecific interaction. N, P content of G. uralensis is higher and K content is lower than C. microphylla. N, P, K uptake of C. microphylla were bigger. In mixed system, 1a G. uralensis and 2a C. microphylla had a bigger nutrient obsorbed efficiency. NUE, PUE of C. microphylla was bigger and KUE was less. CaUE of 1a C. microphylla was less and 2a bigger. Fertilizer increased GA accumulation. When K60 g m-2, N80 g m-2, P40 g m-2 were fertilized, GA content was higher than control.(6) SWC(soil water content) changed interspecial reaction. When SWC=30% or 50%, G. uralensis had more stronger competitive ability. When SWC=50%, G. uralensis accumulated most biomass withgood root and highest GA content. When SWC=20% or 70%, C. microphylla had more stronger competitive ability.(7) In the test field, compound planting of C. microphylla and G. uralensis was helpful to G. uralensis growth with obvious edge advange. This vegetation was fit for dry condition. In the condition of field (C. microphylla 1×5 m. G. uralensis 15×30 cm, their distance 50 cm) of 5 m belted planting, interspecial competition was less than inspecial competition and G. uralensis gained bigger biomass.The paper reported newly interspecific interaction mechanism of C. microphylla and G. uralensis by root barrier technology. Combination with field trial showed competitive ability of C. microphylla was bigger when distance was near and promotion action edge effects gradually increased with distance increasing; By pot trials adjustion action of N, P, K, Ca fertilizer on interspecific relationship were studied. Fittable fertilization might adjust effectively interaction relationship and improve yield and quality of G. uralensis; by control water trials, adjustion action of soil moisture on interspecific relationship were studied. Yield and quality of G. uralensis were better under SWC 50%. Compared with fertization, water was more effective measure to adjust interspecific relationship. Compound planting pattern for C. microphylla and G. uralensis was provided in the final.
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