关键词: 水曲柳, 磷胁迫, 叶绿素合成, 光合作用, 生物量分配

Abstract: The soil microbial quotient (qMB,qCO₂) values,number,biomass-C,biomass-N,and respiration rate were preliminarily analyzed.The results indicated that these items were higher in Rhododendron fortunei forest soil, Pinus taiwanersis forest soil,tea plantation soil,and bamboo forest forest soil,compared to other 5 types of forest soils. That of soil microorganism was the lowest in Cryptomeria fortunei forest soil.The mean value of microbial indices was higher in the natural woods soils than that of the artificial woods soils.The soil locality condition and soil characteritics showed synthesis effect on the difference of the microbial indices from 8 forest soils.The qCO₂ values were higher(4.52%,4.43%,4.265) in C. fortunei forest soil, Chamaecyparis pisifera forest soil,tea planation soil,and bamboo forest soil than in to other soils. The qCO₂ values were lower (3.475%,3.82%,3.70%) in R. fortunei forest soil, Pinus taiwanersis forest soil and Heptacodium miconioides forest soil whose quality were better,and the potentiat for sustainable use of soils was higher.The qCO₂ value not only acted as a harmonious coefficient between the microbial respiration rate and microbial biomass, but also had an ecological importance for reflecting the soil characteristics and the sustainable use of soils.

Key words: Fraxinus mandchurica, Phosphorus stress, Chlorophyll biosynthesis, Photosynthesis, Biomass partitioning