关键词: 放牧, 围封, 施肥, 土壤微生物, 磷脂脂肪酸

Abstract: The phytocoenology of Pinus sylvestriformis plantation was studied and the results showed that there was an obvious differentiation in diameter;there were only 63 species in the plantation,where hemicryptophyte was dorminant(39.68%);greeryptophyte was space(only 1.59%),according to the numerical analysis;Simpson diversity was 0.87,Shannon-Wiener diversity was2.96,and evenness index was 0.82. Growth pattern showed that Pinus sylvestriformis was a fast-growing species. In the structure of community,there were tree layer,shrub layer and herb layer,in which the biomass of tree layer was dorminant and took 95.62%in proportion. Based on these,a model of maximum density of Pinus sylvestriformis plantation was proposed,i. e.,logN=1.1686logD+4.5835,and some management techniques and measures such as density management,debranching technique,regeneration felling etc,were suggested.

Key words: grazing, enclosure, fertilization, soil microorganisms, phospholipid fatty acid.