Study On The Population Ecology Of Drepanostachyum Ludianense Clonal In Karst Area

Drepanostachyum Ludianense is a plant with high economic and ecological value. The results of literature hunting indicated that little numerical analysis ,concerning pop structure and growth dynamics ,had been down for Phyllostachys nidularia Munro Based on resource analyzing, this dissertation studied the clone growth and cultivation mechanism by applying the theory and method of colonel plant population ecology. The contents of study included : Degraded shooting percentage, Module, Biomass structure; Populations tructure , Distributionp atterns.The purpose to provide a theoretical basis and information for resource using of Drepanostachyum Ludianense,and enrich there search contents of colonel plant population.The main results were as follows:1. the period of bamboo shoot coming up out of soil was about 60d and the prosperous stage appeared from 5 to 25 of September. The percent age of shoot degradation was 34.58%,mainly because of nutrient deficiency.growth in height shown Logistic equation and went on About 30d,the growth rhythm was obviously different between day and night;growth in base diameter lasts 15d,but it is not abvious.2.The diameter, the length, of the Drepanostachyum Ludianense appear the traditional"S"shape curve along with the increase of the age building-up, but the diameter change is not very obvious. The growth situation of Drepanostachyum Ludianense is better with living in the isolated wood than the edge of forest and the forest, As soon as lives high along with the age increase, the population internal competition day by day intensely but gradually advances. At the same time the stalk on the most number of the branchings along with the age increase, the population internal competition is day by day intense but reduces gradually.3. each age-class aboveground biomass structure of Drepanostachyum ludianense clone population in different habitat was, in upside of slope lower part the slope is: 3age >2 age >4 age >1 age; branches and leaves only distribute in the stem certainly highly in the scope, its biomass presents "small, is big, is small" the change tendency along with a bamboo ascension, the stem biomass was gradually reduces from the ground upward; the moisture content of stem take annual as high, the moisture content of aboveground was reduced gradually with the age growth . Analys reasonable degree of the age structure , grow the diameter class structure and the height-class structure in the method of the covariance quantity. the stub number from 0.502cm to 0.600cm is the most, the stub( stem) is high the stub number the height from 4.1m to 6 m is most.4. the spatial pattern of Drepanostachyum ludianense clone population was the clumped distribution and the pattern scale was at 45.08m~2 , the relative intensity difference(RDD) was 1.25, the pattern grain was 17.65cm. The sympodial ramets hold the dominant status in the clone growth Of the Drepanostachyum ludianense clonal population. The strengthening trend of the clumped distribution with ageing implies that the population was under a relatively stronger environm ental pressure.