Preliminary Study On Drought Resistance On Three Species Of Ground Cover Plant

Our country has the rich cover plant resources rich, it is long history glorious, theapplication is widespread, it is the important foundation material for botanical garden green,the botanical garden flora is the essential part, it is playing the extremely vital role to the city inthe protection environment.This article takes three kinds of cover plants for the research object, and the laboratorieruses plants which came from the Harbin botanical garden scientific research institute, Selectsthe bonsai method. Studies in arid forces about the three kinds of plants exterior shape change,the physiological target change as well as three kind of plants's leaf blade dissection structuralchange. The synthesis arranges three kinds of cover plants to combat drought the ability. Theresearch structure indicated that:(1)Under the arid forcing, saturated owes by the scenery day leaf lacks assumes alongwith the soil moisture content drop tendency, it is forcing achieved 84th day time, appeared theminimum value, compared with the comparison dropped 46.83%; Glechoma hedracea isforcing achieved 16th day time appeared the minimum value, compared with the comparisondropped 85.80%; Withered the water chestnut vegetable arid forced the 41th day time to appearthe minimum value, compared with the comparison dropped 82.06%.(2)Under the arid forces, along with it is arid forced by the scenery day membranepenetrability intensifies the gradual rise, when forces the 59th day time and the comparisoncompared elevated 25.41%; Glechoma hedracea forces the 14th day time and the comparisoncompared rose 34.00%; Withers the water chestnut vegetable forces the 20th day time and thecomparison compares rose 31.63%.(3) Under the arid forces, by the scenery day along with intensifying which forces, theproline content has not certainly been appeared the sudden change, the opposite proline contenthas not nearly come under the influence which arid forces, moreover the proline content arebeen very few by Sedum; Glechoma hedracea in along with arid intensifies the proline contentto appear the rise the phenomenon, when forces the 14th day time appeared the maximumvalue, compared with the comparison rose0.05mg/g; Withered the water chestnut vegetablealong with intensifying which arid forced, the proline content also had the increase situation,when forced the 41th day time accumulated the maximum value, compared with thecomparison rose0.04mg/g.(4)Under the arid is forcing by scenery day, Glechoma hedracea may the accommodatingprotein content nearly not have the change; Withers in the water chestnut vegetable to bepossible accommodating protein content comparison high, but the changes is not very obvious. (5) Under the arid is forcing, the content change is not been certainly obvious by Sedumsoluble sugar; Glechoma hedracea along with arid intensifying, but soluble sugar the contentappears the rise the phenomenon, to 14th day time and the comparison which forces comparedrose0.82 mg/g; Potentilla L itself to be possible soluble sugar the content on comparison high,when it is forced the 47th day time and the comparison compared rose0.85mg/g.(6) Under the arid is forcing, the chlorophyll content presents the drop the tendency. BySedum at arid 83th day time appeared the minimum value 0.03mg/g.Glechoma hedracea arid isforcing the 16th day time and the comparison compared dropped 1.45mg/g; Potentilla L aridforced the 47th day time and the comparison comparison dropped 2.08mg/g.(7) After the arid forces the three kinds of cover plants which the leaf blade structure to bechanged, along with the arid forces intensifies, three kinds of plants' leaf blade thickness toreduce; Sedum belong to the CAM plant, the blowhole is been open at night, it is closes atdaytime, it has strongly combats drought the ability; Potentilla L have2stockades organization,but Glechoma hedracea has only one; Potentilla L has vascular bundle Glechoma hedracea thequantity many,moreover to be more developed than.Thus it can be seen see the combatting drought strong and the weak order for the place bySedum.pss＞Potentilla L＞Glechoma hedracea.