Recreation Impact Factor Of Pinus Tabulaeformis And Quercus Variabilis In West Mountain Of Beijing

In this research, four types of stands in West Mountain of Beijing, including Pinus Tabulaeformis, Quercus variabilis Blume.of the same age, Quercus variabilis Blume.of the different ages, and P. tabulaeformis×Q. variabilis Blume., had been explored in order to learn their recreation impact factors, such as air ions concentration, the types of volatile organic compounds and the relative content, carbon sequestrations, oxygen release and the citizens’ evaluation indexes. The main conclusion was as follows:(1) The significantly different has been found that the average air ions concentration were different in different seasons and stands. The average air ions concentration were1339ions/cm3,1229ions/cm3,1179ions/cm3,1543ions/cm3,and in summer it was significantly higher than in spring and autumn, while anion concentration in spring was not significantly different with autumn. Different stand on the air ions concentration were different, too. The air anion of P. tabulaeformis peers stand was significantly higher than the other stands, P. tabulaeformis×Q. variabilis Blume.andQ. variabilis Blume of the different ages were not significantly, while significantly higher than Q. variabilis Blume.of the same age.(2)The types and relative contents of volatile organic compounds (VOCs) were different in the two stands.There were seven kinds of VOCs, including alkanes, ketones, organic aldehydes, aromatic hydrocarbons, terpenes and other substances. Among them, terpenes which played a major role in health care had six kinds of VOC,(±)-limonene, alpha-pinene, caryophyllene, and other kinds of organic compounds.(-)-limonene is relatively high in P. tabulaeformis×Q. variabilis forests and Q. variabilis forests in a low level. (3) The carbon sequestrations and oxygen release of Q. variabilis Blume in two ages has significant differences in different seasons; The ability of carbon sequestrations and oxygen release of P. tabulaeformis standard tree throughout the year (March-October) had little changes. The Q. variabilis Blume carbon sequestration and oxygen release capacity were up to258-290kg, P. tabulaeformis were27.7kg a month. The yearly carbon sequestrations of Quercus variabilis was3404.86kg, oxygen release capacity was2502.72kg.(4) The recreation on a different stand and comprehensive evaluation system in the forest section of this structure, visual effects, given the right to the highest weight, stand structure and visual effects should be noted that in the scenic and recreational.