Propagate Characteristic On Dichondra Repens Forst. In The Southwest Of China

There is rich resource of Dichondra repens Forst. in southwest of China, screening the materials which showed best turf landscape value and strong resistance on the pre-test, researched on the asexual reproduction and sexual reproduction characteristics, studied on the best plant density of the clone, flowering habit and seed vigor, and explored the way of improving the seed vigor, provide a theoretical basis of promotion of D.repens. The results show that:1. The main stolon of D.repens elongated as long as possible to occupied the ecological niche at first. But its increasing rate reduced varied with time. The positive correlation between the number of ramets and the length of main stolon as well as the dynamic change of spacer were all showed that the special structure of clone was gathered around origin plant and the extending of clone was due to the contribution of origin plant, lamina and the senior ramets. Although its number was different at one time, the main stolon elongated behaved the same rule.2. The main stolon elongated always keep the growth patern of matrix and not limitless in enough space. The main stolon length and leaf number increased by turns, the above biomass varied by turns and the allocation and structure of the clonal number and biomass show that there are mater and energy balance between the growth and the extending, also show the different environmental adaptation strategy of D.repens at different growth period.3. Because of the clone integration, D.repens made best ues of the resource and energy and behaved the best growth state under the density of D2. The above biomass of the stolon and leaf increased as density increased, but it did not come to a constant value. But the biomass per branch began to decreases as the density became bigger.4. The clone structure of D.repens varied under different densities: the spacer length descending, the interbranching angle increased and the branching density descending as well as the density increased; all the plasticity under different density indicated the environment adaptability of D.repens.5. All the wild D.repens divided in three bloom styles based on the bloom and seed time: (1)No bloom all the year,such as SD200309 and GD200503;(2) bloom once per year, peak flowering date focused from Mar. to May, seed date focused from May to Jul., it contained SD200303 and SD200304; (3)bloom all the year except the scorch period, the florescence and seed periods were laped over, bloom time were varied and it began at the originally stolon radicle and continued to the extended aspects, all the wild D.repens blonged to the style except SD200303, SD200304,SD200309 and GD200503.6. The Germination viability, germination capacity, germination index and vitality index were enhanced two to three times after the seed capsule frazzled; but the seeding growth was not advanced, as physics method can't change the inside chemistry of seed.7. The seed vigor and the seedling growth of D.repens were enhanced after the chemistry gibberellin and polyethylene glycol soaking. Comprehensive analysis indicated that the seed germination rate was significantly higher after 75ppm of the GA soaking four hours; the germination viability, germination capacity, germination index and vitality index improved most significantly after the PEG of 20% soaking 48 hours.