Study On Ecological Hydrological Process Of Karst Forest In Linhu Basin Of Southeast

Research on forest ecosystem horological process is the core of forest community in the process of the regulation and distribution of rainfall.This article chose the southeast Yunnan HuPen District hills north of Puzhehei as the study area,through one-year fixed point observation and experiment, a basic understanding of Puzhehei area of typical structure characteristics of vegetation community and different karst forest ecosystem regulation and distribution of atmospheric precipitation.In this process, a survey of forest stand structure for leaf area index and crown density, and the different levels of forest distribution of rainfall and intercept.The main research content is as follows:(1) The karst secondary forest and yunnan pine plantation forest tree leaf area index and crown density investigation, and with the canopy interception rate analysis found that in the leaf area index of subtropical evergreen broad-leaved forest forest crown density and annual variation coefficient, and the correlation coefficient of canopy interception rate is not high, in general, Puzhehei karst area of leaf area index and crown density have less effect on the distribution of rainfall.(2) The forest canopy layer of person that’s study area and the study of the different levels of precipitation distribution, found that volume inside and outside rainfall interception of different levels have a close relationship.Three typical tree fragrant wood, oak and even the cone of yunnan pine forest canopy to redistribution of rainfall were as follows: forest > rainfall interception by canopy > trunk runoff.(3) Based on limestone, thickets of four kinds of undergrowth surveillance and interception by canopy experiments, analysis thickets of the forest canopy entrapment quantity compared with the arbor is larger, and four kinds of underwood withholding rate from big to small in turn is: tiger thorn > lobular sheep >hoof nail > scent camphor wood.(4) Of litter and soil in the study area, respectively, to experiment and research.The results show that the karst arbor litter effectively held deep, saturated water-holding performance in soil were higher than in limestone thickets.(5) Through the Gash model the various parameters, to simulate and predict the canopy entrapment volume in the study area, the accuracy of the canopy saturated rainfall simulation effect is much greater than canopy unsaturated rainfall.Smaller error of simulated values and measured values, shows that this model is suitable for use in the region.