Ecohydrological Functions Of Phyllostachy Pubescens Stands And Its Dynamics Of Soil Fertility

Phyllostachy heterocycla cv. Pubescens, is a kind of plant of wide usage, is easy to cultivate, the growing cycle is short, not only has the very high economic efficiency, moreover has the very high ecology benefit.Experiment plots were established in Anji,Suichang of Zhejiang province and Yongan of Fujian province for long time study. The research content includes:The comparison of bamboo stand runoff nutrient in different fertilizing ways, the comparison of bamboo stand runoff nutrient in different gradients, the comparison of runoff nutrient in moso bamboo stand and bamboo stand mixed with broadleaves. Also take Anji County as the typical model district, has studied the soil fertility dynamic change in bamboo stand with different management years. The findings indicated:(1)The difference of P, K nutrient quantity in the same rainfall in stump fertilization way and furrow fertilization way has not come to be remarkable, and N nutrient draining in furrow fertilization way is serious compared stump fertilization way ,reaches 5% remarkable difference. Identical time rainfall the runoff nutrient density which the stump executes to be bigger than the furrow fertilization way, but the total quantity in the research cycle with the furrow fertilization is obviously higher than the stump fertilization.(2) The nutrient quantity is not obviously different in different gradient in the same rainfall. The nutrient density in big gradient is higher than the gradient slightly. In the observation cycle the total nutrient quantity in big slope drains obviously to be higher than the slope slightly. The total nitrogen drains the quantity in 25 degree 2.53 times than in 15 degree, while total phosphorus was 2.66 times and K element was 4.98 times.(3) The nutrient quantity is not obviously different in moso bamboo stand and in moso bamboo stand mixed with broadleaves in the same rainfall. The nutrient density in moso bamboo stand mixed with broadleaves is lower than moso bamboo stand. In the observation cycle, N, the P element total quantity in moso bamboo stand mixed with broadleaves is higher than which in pure bamboo stand ,while K element is lower than the pure bamboo stand.(4) Through different years management, the bamboo forest land soil chemistry nature shows different characteristic .Along with management years increase, soil's pH value go down ; The soil's OM, TN and the hydrolyte N all drops; The soil total P and the available K drops at first ,then go up. The total nitrogen, hydrolyte N ,available K and soil's OM are principal components in the soil fertility factor analysis. The soil's pH value and the total phosphorus quite are small in the soil fertility contribution.(5) In summer, average temperature, extreme temperature in bamboo stand existence variation, by highest temperature variation scope biggest, the date lowest temperature is next, the daily average temperature is smallest. The average daily range is 6.58℃, is smaller than the spacious place which is 8.23℃. The bamboo forest can adjustment temperature change .The bamboo forest affect the daytime temperature rising through preventing the solar radiation , which relaxes the temperature change. In the bamboo forest, probability of date high temperature appears in the high noon is highest, reaches 41.3%,which delay the outside.