Effects Of Water Stress On Growth And Physiological Characteristics In Pinus Sylvestris Var. Sylvestriformis

In order to investigate the reaction and adaptation of Pinus sylvestris var. sylvestriformisunder water stress, taking two-year-old seedlings of Pinus sylvestris var. sylvestriformis as testmaterials, Set8treatment levels (including controls), CK soil relative water content of75%,drought stress: soil moisture content of55%to45%relative soil moisture, soil water content of35%, continuing drought; Flooding Stress: Saturated moisture, semi-flooded, all floodedrepeated three times for each level (15seedlings of120pots) soil moisture control. Soil watercontent to field capacity as a benchmark, measured using the gravimetric method.the growth andphysiology of the changes under different soil moisture conditions are studied.Test results wereas follows:1.Except when soil moisture reaches saturation of Pinus sylvestris var. Sylvestriformisheight growth is not obvious, other water stress were significantly inhibited seedling heightgrowth Pinus sylvestris var. Sylvestriformis.The degree of inhibition, the flooding stress greaterdrought stress;Except for45%,35%significantly inhibited the growth of stem diameter, and itsstress treatments had no effect on the growth of stem diameter Pinus sylvestris var.Sylvestriformis;There are35%of the soil moisture shoot ratio significantly different comparedwith the control, other treatments were not significantly.2.When drought stress when the soil relative water content less than45%of Americansloose leaf relative water content decreases, and with the increase of stress intensity, the greaterthe impact;Flooding Flooding Stress in the full beauty treatment make loose leaf relative watercontent reduced;Treatment effect on the chlorophyll content of35%to reach a significantlevel;Three treatments flooding stress on chlorophyll content were not significant.3.For45%, significantly increased by35%and total flooding process proline;Processing35%, a significant increase in half-flooded and flooded the whole process soluble proteincontent;Handle35%of the soluble sugar content significantly affected, flooding three stresstreatments on the soluble sugar content was not significant;Processing35%, half-flooded andflooded the whole handling of leaves significantly affect cell membrane permeability andsignificantly increased;Processing35%, a significant increase in the full flood ofmalondialdehyde (MDA);SRWC35%saturation processing, semi-flooded treatment sobeautiful pine leaf SOD activity decreased. 4.Pinus sylvestris var. Sylvestriformis seedlings died after prolonged drought30d.Consolidated results Pinus sylvestris var. Sylvestriformis moisture resistant ecologicalamplitude: saturated water content to a range of35%relative water content of the soil can makePinus sylvestris var. Sylvestriformis normal growth.