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城市化所改变的土壤利用方式将显著地影响土壤磷素(P)含量水平。本研究沿地处中亚热带地区的南昌市选取灌丛、松林、针阔混交林、常绿阔叶林和毛竹林为研究对象,采用改进Hedley的P素连续分级法分析了土壤全P及各功能P形态的分布规律。结果表明:森林表层土壤全P和可提取态P的含喇均表现为城区(0.71g·kg-1和378.50mg·kg-1)明显高于郊区(0.30g·kg-1和150.74mg·kg-1)和农村(0.31g·kg-1和147.38mg·kg-1)(p<0.05)。在树脂P、NaHCO3-P、NaOH-P、声波P和HCl-P等5种功能P形态中,城区森林土壤HCl-P的相对含度最高,为36%,明显高于其郊区相对含量为8%年农村相对含量为6%的水平。而郊区和农村地区,土壤NaOH-P是其主要的存在形态,其相对含量分别达到41%和50%。可见,城区土壤P积累将影响城市森林生态系统的P循环,且其高含量的HCl-P可能加速P在城区水生系统的富集。图3表2参32。
Changes in soil use by urbanization will significantly affect soil P (P) levels. In this study, we selected shrubs, pine forests, mixed coniferous and broad-leaved forests, and evergreen broad-leaved forests and Phyllostachys pubescens forest in Nanchang City, located in the subtropical region, as the research object. By using improved Hedley’s P continuous grading method, Function P pattern of the distribution. The results showed that the urban P (P <0.01) and soil extractable P (P> 0.05) were significantly higher in the urban areas (0.71 g · kg -1 and 378.50 mg · kg -1) than in the suburbs (0.30 g · kg -1 and 150.74 mg · kg -1) kg-1) and rural (0.31 g · kg-1 and 147.38 mg · kg-1) (p <0.05). In the five functional P forms of resin P, NaHCO3-P, NaOH-P, sonic wave P and HCl-P, the relative content of HCl-P in urban forest soil was the highest, 36% 8% of the rural relative content of 6% level. In suburban and rural areas, soil NaOH-P is the main form of existence, the relative content of 41% and 50% respectively. It can be seen that accumulation of soil P in urban area will affect the P-cycle of urban forest ecosystems and its high content of HCl-P may accelerate the enrichment of P in urban aquatic systems. Figure 3 Table 2 Reference 32.