Studies On Ecological Function Of Eight Ornamental Bamboos In Urban

Choosing the 8 relatively isolate Ornamental bamboos (including P. aureosulcata 'Spectabilis', P.aureosulcata 'Aureocaulis', B.multiplex cv.Alphonse-Karri Nakai, B.multiplex Raeuschel cv.Fernleaf, P.pubescens fheterocycla, B. multiplex vat. riviereorum, P.amarus, B. intermedia) as research material, the thesis conducts a research on its physical and ecological feature by a serial of quantitative measure and analysis on the index of ecological function and ecological adaptation. It also provides scientific evidence for the reasonable application and the optimization of distribution of bamboos so as to appraise its environmental values of bamboos in gardening. The main results include:Firstly, it indicates that P. Amarus has the biggest LAI while the B.multiplex.Raeuschel cv. Fernleaf has the smallest. The difference of green biomass between P.amarus and other bamboos is statistically significant. So is the difference of green biomass between B.multiplex. Raeuschel cv.Fernleaf and B. multiplex var. riviereorum. But the difference among other bamboos is not statistically significant.Secondly, it guides the application of bamboos in the city gardening by quantitatively measuring, analyzing and comparing their index of ecological function including the function of keeping the balance between Carbon dioxide and Oxygen, Atmospheric particle-retaining capability, Bactericidal variation capability etc.Thirdly, the ecological adaptation index, including their adaptation ability in high CO₂ density, Light intensity and low-moisture environment, was measured and the results indicate: (1) when the CO₂ density of the surrounding conditions rises greatly, the net photosynthetic rate of the eight bamboos firstly maintains a short rise before it fall down gradually and their WUE increase significantly. But the Transpiration rate decreases with the rising of the CO₂ density. B.multiplex cv.Alphonse is able to adapt to the environment with high CO₂ density. But B.multiplex Raeuschel cv.Fernleaf and P.amarus is relatively poor. (2) The use efficiency of weak light is higher than that of the strong light, among which the use efficiency of the weak light of the P.amarus, B.multiplex cv.Alphonse, B.multiplex. Raeuschel cv.Fernleafis 10 times as strong as that of the bright light, indicating the above plants can bears a certain shady environment and survives. The LUE of eight bamboos will rise with the increasing of light intensity when the PAR is between 0～100μmol.m^-2.s^-1 and fall down gradually between 100～2000μmol.m^-2.s^-1. (3) There isa great difference in water competitive capacity among different bamboos. As a whole, B.multiplex var. riviereorum and P.amarus have a relatively strong water competitive capacity and drought-resistant ability, while B.multiplex cv.Fernleaf.comes finally. There is also a great difference in the index of WUE among different bamboos at different time. This is an adaptive strategy to the environment. All the other seven, except B.multiplex cv.Fernleaf, have strong drought-resistant ability.Fourthly, recommend the vegetation suitable for different districts according to the biological and ecological features of the ornamental bamboos.