Effects Of Upside Broadleaf Forest On The Productivity Of Phyllostachys Heterocycla Var. Pubescens Forests Of Mountain Areas In Northern Fujian Province

This paper take Phyllostachys heterocycla var. pubescens mountains existing broadleaf forest that on the mountaintop as study objects. We analysised the effects of mountaintop broadleaf forests on the productivity of Phyllostachys heterocycla var. pubescens forests,soil gravimetric water content of Phyllostachys heterocycla var. pubescens forests on the bud sprout period,soil organic matter content and hypogeal structure of Phyllostachys heterocycla var. pubescens forests. This paper totally researched A,B,C,D four types. The proportion of broadleaf forest on the mountaintop in total slope projection area respectively is 31%,15%,4%, 0%. We setted a series of plots on each type and investigated several main factors. After establishing functions, we keep other factors (on mean level) unchanged, then analysis the effects of broadleaf forest on the mountaintop to Phyllostachys heterocycla var. pubescens forest at different altitude. The main conclusions are as follows:1. The biggest mean chest height diameter of Phyllostachys heterocycla var. pubescens forest is typeB, the second is typeD, the last is typeA. There is a phenomenon of type A&B that chest height diameter increases gradually when altitude increasing. TypeD reverse to that. The increment extent of typeB is the biggest.2. At altitude 850m area, the average chest height diameter of typeA,B,D increase gradually with the increment of mixed proportion. The smallest increment extent is typeB, the second is typeA, the biggest is typeD. It can be concluded that the existence of mountaintop broadleaf weaken the Phyllostachys heterocycla var. pubescens forest's dependence on mixed proportion. Therefore on the Phyllostachys heterocycla var. pubescens mountains that exist mountaintop broadleaf forest can plant more pure bamboo forest.3. The biggest soil gravimetric water content of Phyllostachys heterocycla var. pubescens forest on the bud sprout period is typeA, the second is typeB, the last is typeD. The typeB changes smoothly at each altitude. It can be concluded that mountaintop broadleaf forest works as a current stabilizer.4. The soil gravimetric water content of Phyllostachys heterocycla var. pubescens forest on the bud sprout period of typeA,B decreases gradually with the increment of mixed proportion and Phyllostachys heterocycla var. pubescens density. TypeD have a feeble increased trend. It can be concluded that broadleaf forest on the mountaintop of typeA&B can take a very good interception effect. And the interception effect of increment of mixed proportion and Phyllostachys heterocycla var. pubescens density is not important, on the other hand they will absorb more water.5. The biggest mean soil organic matter content is typeB, the second is typeA, the last is typeD. Soil organic matter content of typeA,B show a obvious phenomenon that with altitude decreasing gradually, the value changes from high to low to high. Middle position of slope is the lowest. Typed changes smoothly.6. Useing the method of Principal Components to generally evaluate the winter bamboo shoot and bud sprout situation, the highest score is typeA -2.0662, typeB,C,D is respectively 107.38%,202.43%,110.00% lower than typeA. It can be concluded that typeA and typeB is better.