Effect Of Local Density On Reproductive Success In 3 Plants

Investigated the reproductive success of 3 plant of Oxalis acetosella.Rumex acetosa and Sambucus chinensis in Ya’an,2014. choosing 50,40 and 35 individuals randomly from each populations, observing its flower number, seed number and fruit number, taking the part on the ground and weighed separately with fruit. According to the individual plant size, 2 methods of using different local neighborhood density and distance.In Oxalis acetosella population, the target individual as the center, with four rings of radius 10cm,20cm, 30cm and 40cm Hoop Ring, from the inside and outside of respectively counting the number of plants and remember for D1, D2, D3 and D4, representing different local neighborhood density. In Rumex acetosa and Sambucus chinensis population were measured and the target plants recently 5 strains of inter individual distances, and calculate the nearest 1 strains,2 strains,3 strains,4 strains and 5 strains of the average distance, remember N1, N2. N3, N4 and N5, to represent the nearest neighbor distance. Through study the effect of local density or nearest neighbor distances on overground weight, seed number and fruit weight, to explore the effect of local density on the reproductive mechanism, the results are as follows:(1)The overground weight of Oxalis acetosella were affected not significantly by DL D2. D3, D4, the overground weight of Rumex acetosa were significantly affected by Nl, but affected not significantly by N2, N3, N4, N5, the overground weight of Sambucus chinensis were significantly affected by Nl, N2, but affected not significantly by N3, N4, N5, which shows that resource competition existed in individuals, even considering two adjacent strains in the distance scale. The plant growth environment will affect the intraspecific competition, and competition existed in individuals, but occurs only in a certain range in individuals, beyond the scope of competition is not obvious or does not exist.(2)The seed number of Oxalis acetosella were affected not significantly by D1. D2. D3. D4. Nl, N2. N3, N4. N5 have obvious significant correlation in population of Rumex acetosa, represented by N1 the analysis shows seed number were affected not significantly by N1, and N1, N2, N3. N4, N5 have obvious significant correlation in population of Sambucus chinensis. represented by N1 the analysis shows seed number were affected not significantly by N1. which shows that local density has no effect on seed number in 3 plants.(3)The fruit weight of Oxalis acetosella were significantly affected by Dl. the fruit weight increased with the increase of the density, but affected not significantly by D2, D3, D4, represented by N1 the analysis shows fruit weight were affected not significantly by N1 in population of Rumex acetosa, represented by N1 the analysis shows fruit weight were affected not significantly by N1 in population of Sambucus chinensis, which shows that high density in favor of Oxalis acetosella individual reproduction in good growth environment but local density has no effect on fruit weight in 3 plants.(4)The overground weight were significantly affected by flower number, seed number, fruit weight, the flower number, seed number, fruit weight increased with the increase of the overground weight, which shows that reproductive are dependent on the individual size in 3 plants, neighbors for the effect on Size-dependent reproductive plant is affected by the individual size.(5)For the Size-dependent reproductive plant, the bigger individual size is the higher input into reproduction, which can produce more flowers, more seeds, and seed yield is also higher.