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作 者 ：胡君利,林先贵,尹睿,褚海燕,王俊华,张华勇,曹志洪

期 刊 ：生态学报 2008年 28卷 4期 页码：1552~1557

关键词：水稻土；利用年限；微生物生物量；土壤酶活性；供氮能力；供磷能力；

Keywords:paddy soil, utilized years, microbial biomass, soil enzyme activity, nitrogen supply capacity, phosphorus supply capacity,

摘 要 ：测定了浙江慈溪5个不同利用年限水稻土（50~2000 a）的微生物生物量C、N和过氧化氢酶、转化酶、脲酶、磷酸酶的活性，分析了水稻土的生物化学环境质量与利用年限的相关性。结果发现，随着利用年限的延长，水稻土的微生物生物量C与N均趋于下降，其中微生物生物量N能较灵敏地反映利用年限造成的差异（p = 0.091）；水稻土的过氧化氢酶与转化酶活性均呈下降趋势，其中过氧化氢酶活性与利用年限之间确有线性回归关系（p = 0.042）；水稻土的脲酶活性不呈显著变化规律，而磷酸酶活性显著上升，其与利用年限之间确有线性回归关系（p = 0.022）。总体表明，利用年限延长虽然会降低水稻土中微生物的生物量和整体活性，但对水稻土的肥力并没有产生不良影响，相反对水稻土的供磷能力有保育和增强作用，而对水稻土的供氮能力没有定向影响。

Abstract:The microbial biomass C, N and the activities of enzymes, including catalase, invertase, urease and phosphatase, were investigated in five paddy soils with different utilized years, from 50 a to 2000 a, and the correlations between these biochemical properties in paddy soils and the utilized years were estimated. Both soil microbial biomass C and N tended to decrease with the increased utilized years, and the biomass N was more sensitive to reflect the difference caused by utilized years (p = 0.091). With increased utilized years, soil catalase activity decreased significantly (p = 0042) and invertase activity tended to decrease, while urease activity had nondirective alteration, but the phosphatase activity increased evidently (p = 0.022). The results suggested that, the sustained utilization of paddy soil could decrease the biomass and the total activity of soil microbial community, but could not result in the decline of soil fertility. Our result also indicated that, the sustained utilization had a potential to increase phosphorus supply capacity of paddy soils, but may not affect the nitrogen supply capacity.

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