Study On Wear Tolerance Of Native Bermudagrass In Sichuan

Four native bermudagrasses and one hybrid bermudagrass cultivar Jackpot as check were evaluated under no wear stress, severe wear stress(rolled 25 times) and light wear stress (rolled 10 times) provided by a specific roller with nails in the field from 5 July to 30 August,2003. The rolling frequency was once a week. The morphological indexes, biological indexes and physiological indexes were measured in different period of wear control. The result showed as follows:1.In morphological and biological traits significant differences were found in native bermudagrasses and Jackpot. The differences in cover and overground biomass were identical from July to September under wear control. J7 from Jialin River Area was the best ,which was just as same performance as Jackpot, M22 and M28 from Min River Area were followed, and Q10 from Qingyi River Area was the worst. The differences in stem node number and leaf number were as identical as it in cover. J7 and Jackpot had the highest number, M28 and M22 had the higher, Q10 had the least. The tillers had a little difference from the numbers of stem node and leaf, J7 (most)> M28=M22> Q10= Jackpot (least).2.Three physiological indexes including percent coarse-fiber,chlorophyll, soluble sugar were also measured. Coarse-fiber content was significantly different among grasses, the others were not. But the contents of per area coarse-fiber ,chlorophyll and soluble sugar of J7 were the most ,a little higher than check Jackpot (no significant difference ), M22 and M28 were the next ,Q10 was the least except higher chlorophyll content.3.From different wear intensity the result showed only the tiller number under light wear stress was higher than heavy and no wear stress in all of the indexes in morphological ,biological and physiological traits. The rest indexes all indicated heavy wear stress was mostly harmful to nativebermudagrass turf, light wear stress was less. And significant differences were found among three wear intensities.4.From the result above we could conclude: J7 was the most wear tolerant to wear injury,according to indexes of morphological, biological and physiological traits of native bermudagrasses subjected to simulated wear stress.M28 and M22 ranked second.Q10 was the last.