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作 者 ：倪进治;徐建民;谢正苗

期 刊 ：植物营养与肥料学报 2001年 7卷 1期 页码：56-63

关键词：土壤生物活性有机碳库；周转速率；指标；

Keywords:biologically active soil organic carbon pool, turnover rate, indicator,

摘 要 ：土壤生物活性有机碳库 (C₀)的大小和周转可以指示土壤供应养分的能力以及养分的循环状况。对浙江省 11个土壤的研究表明 ,生物活性有机碳库的变化幅度为 184.87～ 3022.41mg/kg ,占土壤总有机碳的2.91%～8.94% ,生物活性有机碳库的周转速率k为0.0070～0.0199d^-1。C₀与土壤总有机碳、全氮、有效氮、CEC、重铬酸钾易氧化有机碳、微生物生物量碳、微生物生物量氮、水溶性有机碳、热水提取有机碳、轻组有机碳都呈显著性正相关 ,k与这些指标均无相关性。C₀与重铬酸钾易氧化有机碳、微生物生物量碳、微生物生物量氮、水溶性有机碳、热水提取有机碳、轻组有机碳占土壤总有机碳的百分比均无相关性 ,k只与水溶性有机碳占土壤总有机碳的百分比呈显著性正相关 (R²=0.4684 ,P<0.025)。水溶性有机碳占土壤总有机碳的百分比是表征土壤生物活性有机碳库周转的较好指标。

Abstract:To study the size and turnover of the biologically active soil organic carbon pool, which indicate nutrients supplying capacity and cycling in soil, eleven soils collected from Zhejiang Province were used The size of the biologically active soil organic carbon pool C₀ ranged from 184 87 to 3022.41mg/kg and 2.91%～8.94% of total soil organic carbon The turnover rate (k) of biologically active soil organic carbon pool was 0.0070～0.0199d^-1. C₀ has significantly positive correlations with total soil organic carbon, total nitrogen, available nitrogen, CEC, K₂Cr₂O₇ readily oxidized organic carbon, soil microbial biomass carbon, soil microbial biomass nitrogen, water soluble organic carbon, hot water extracted organic carbon and light fraction organic carbon,but k has no correlation with all items above (P<0.05) C₀ has no correlation with the percentages of K₂Cr₂O₇ readily oxidized organic carbon, soil microbial biomass carbon, soil microbial biomass nitrogen, hot water extracted organic carbon and light fraction organic carbon to total soil organic carbon However, k has significantly positive correlation with the percentage of water soluble organic carbon to total soil organic carbon (R²=0.4684, P<0.025) The percentage of water soluble organic carbon to soil total organic carbon was a good indicator to characterize the turnover of biologically active soil organic carbon pool

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