Festuca Rubra And Poa Pratensis Turfgrass Capacity At Different Times Of The Comparative Study Of Drought

Because the Turfgrass the compact surface cover and has the stock level in the surface soil which flocculates,thus has good prevents the soil erosion the function.The moisture content factor is affects the lawn grass to plant one of germination important attributes,lacks the volunteer fire brigade in arid and half arid area lawn grass seedling stage to reduce the lawn to become the level ground quality directly,affects After the turf the ornamental effect.Because Harbin is situated at the northern area,as manages a household the variety take the cold season, mixes the goal which broadcasts is the use different variety or a fine characteristic makes up the insufficiency mutually.Therefore in the present paper uses the grass plants is:The barren area multipurpose mixes broadcasts the combination to include:Purple sheep fescue,lawn precocious standing grain.North this research choice commonly used purple sheep fescue two kinds:'Franklin'and'Laurel',as well as lawn precocious standing grain's two kinds:'park' and 'Conni'.Separately germination characteristic and seedling stage moisture content coercion performance which plants to these four kind of grasses,selects the drought resistance good grass to plant is in the conservation of water and soil domain the noticeable topic.Therefore the present paper selection suits the northern area four kind of cold season lawn grass to plant conducts the research,has studied the seed germination time under the PEG seepage coercion drought resistance;Under the seedling stage moisture content coercion,has studied the lawn grass's physiological reaction dynamic change,and has carried on the quality synthetic evaluation to the lawn grass's drought resistance,draws the conclusion to be as follows:1.Different PEG processes to purple sheep fescue and the lawn precocious standing grain seed's germination percentage has the obvious inhibitory action,and this kind of inhibitory action increases along with the PEG density increase.2.In the moderate coercion(-0.5MPa)under,purple sheep fescue and lawn precocious standing grain each inter-species relative germination percentage has the remarkable difference, manifested 4 kind of grasses to plant in the germination time drought resistance difference.Through compares their relative germination percentage we to be possible to plant to 4 kind of grasses in the germination time drought resistance draws following conclusion: This 4 kind of grasses plant in the germination time drought-resistant ability decrease are: 'Conni'＞'Franklin'＞'Laurel'＞'Park'.3.The PEG processing density with germinates the loss factor to assume the remarkable correlation.Along with PEG density increase,not only suppresses the sloppy kind of germination rate,meanwhile increased seed's loss factor,reduced the purple sheep fescue and the lawn precocious standing grain seed's effective use factor,constructs to the lawn plants is extremely disadvantageous.4.In the low concentration PEG arid coercion(-0.3MPa) under,the plumule has the elongation slightly,but when forces reaches-0.5～-0.8MPa,the plumule grows comes under the suppression obviously.The radicle growth reaches -0.3Mpa when the PEG osmotic pressure and -0.5MPa can the normal growth,but when the PEG osmotic pressure achieves-0.7Mpa,also comes under the obvious suppression.The analysis radicle/plumule's change discovered that,from the PEG processing low concentration to the high potency,its value drops continuously,this also is under the arid coercion the plant growth adjustment basic rule.5.Reduced in the seedling stage moisture content coercion next four kind of lawn grass each physiology target along with the soil relative water content has had the obvious change.May know by the relevant analysis,four kind of lawn grass's soil moisture content and the leaf blade relative water content present correlation or remarkable is being connected,with the cell membrane penetrability,the third dial content,the proline content,the soluble protein content assumes the inverse correlation either remarkable or the extremely remarkable inverse correlation.6.Under but the moisture content coercion 4 variety lawn grass soil moisture content drops unceasingly because of the soil evaporation and the lawn grass transpiration.Continues the drought along with the soil,4 variety lawn grass's lawn quality assumes the drop tendency.Under the moisture content coercion,4 variety lawn grass's leaf blade relative water content assumes the drop tendency.4 variety lawn grass's relative cell membrane penetrability obviously assumes the trend of escalation.In the moisture content coercion earlier period,4 variety lawn grass's dissociation proline content and the comparison difference is not big,later period content rapid increase.4 variety lawn grass's soluble protein content in entire moisture content coercion period,the overall tendency is the increase.4 variety lawn grass's chlorophyll content increases first,after reaches the maximum value the content to drop.4 variety lawn grass's third dial content reduces first in the moisture content coercion earlier period,in later period content rapid increase.7.The lawn grass's drought resistance has carried on the quality synthetic evaluation with the subordination function method to the moisture content coercion way under,finally indicated:For'Franklin'＞'Laurel'＞'Park'＞'Conni'.Under the moisture content coercion way the drought resistance type divides into two kinds:''Franklin','Laurel','Park' are the medium drought-resistant,'Conni' is the weak drought-resistants.8.Most combats drought in seed germination time lawn precocious standing grain variety 'Connie',lawn precocious standing grain variety 'park' most does not combat drought.Drought-resistant ability sorting is:'Conni'＞'Franklin'＞'Laurel'＞'Park'.Purple sheep fescue variety 'polar' most combats drought under the seedling stage moisture content coercion,lawn precocious standing grain variety 'Connie'most does not combat drought.Therefore under the seedling stage moisture content coercion synthesizes drought-resistant ability sorting is:' Franklin'＞'Laurel'＞'Park'＞'Conni'.