Effects Of Different Soil Moisture Content On The Growth Of Leymus Chinensis

This paper studied the effects of soil water content on the Leymus chinensis on both the wildspot and school experimental garden through under five soil moisture gradients artificiallyformed,which was W1:5.81%, W2:11.90%, W3:20.87%, W4:31.83%, W5:58.43%.The growth ofL. chinensis modules under soil water gradients i.e. Modules density and biomass of L. chinensisin the wild spot were the maximum in W4gradient, and the proportion of the rhizome biomassincreased with soil water gradient decrease. In the end of the growing season, the overall growthrate overground and underground was the largest in W4gradient. Soil moisture promoted theincrease of biomass with the increase of density. With the increase of density, the biomassincreased first and then decreased when soil was drought. There was a positive significantcorrelation between the diameter of rhizome and soil moisture gradients (p<0.01). There was anegative significant correlation between the branch angle of rhizome and soil moisture gradients(p<0.01). The number of branches(1m2)in W4gradient was the largest, which was the minimumin W5gradient. The section spacing was the minimum in W4gradient. Account for that soildrought and water stress made modules density, biomass, branch number decrease, the sectionspacing bigger. The proline content in leaf, rhizome and root were the lowest in W3gradient,respectively for0.6809mg g-1DW,0.7626mg g-1DW,0.2357mg g-1DW. Because of delay effect,L. chinensis grew best in W4gradient but stressed minimum in W3gradient. The soil watercontent range that is most suitable for the growth of L. chinensis in the wild spot was20%~35%.The soil moisture gradients in school experimental garden that the L. chinensis was transplantedon were for W2:80%, W4:60%, W8:45%, W16:20%, CK:15%. The season dynamic that L.chinensis bushes spread around indicated that, the density of leaf and over ground stem in W2gradient under the maximum, the density of rhizome, root, bud, section in W8gradient under themaximum. The biomass of all components in W8gradient was the maximum. The diameter ofrhizome increased with soil moisture gradients increase. The branch angle of rhizome was theminimum in W16gradient, no obvious regularity. The proline content of leaf, rhizome and rootwere the lowest in W8gradient. The optimal soil water content for the growth of L. chinensistransplanted is45%. Significant analysis showed that the response of components density, biomass, rhizome branch pattern, growth rate and proline content of L. chinensis on soil water content wasvery significant (p<0.01).