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采用土壤培养实验方法,研究了25年施肥对平凉黑垆土土壤生物活性有机碳库(C0)的影响。结果表明:土壤生物活性有机碳库(C0)以施用有机肥处理显著增大,其中以S+NP处理最高,达1071.00μg/g,M+NP处理为940.85μg/g,M处理为776.90μg/g,分别比CK增加1.86倍、1.51倍和1.07倍,单施N肥处理对土壤生物活性有机碳库影响不大,为399.10μg/g,仅比CK增加6.4%,NP配合处理为621.60μg/g,比CK增加65.76%。增施有机肥料可明显增大土壤生物活性有机碳库(C0),NP化肥配合施用也有良好效果,N肥单施无明显作用。土壤生物活性有机碳库(C0)占土壤总有机碳(TOC)的百分比为2.70%～6.34%,生物活性有机碳库的周转速率(K)为0.0223～0.0301d-1,生物活性有机碳库在土壤中的半周转期(T1/2)为22.55～31.09d。土壤生物活性有机碳库(C0)与土壤全氮呈极显著性正相关,与总有机碳(TOC)呈显著性正相关。
Soil culture experiments were conducted to study the effects of 25 years of fertilization on soil bio-active carbon pool (C0) in Pingluo black soil. The results showed that the soil organic carbon (C0) increased significantly with the application of organic manure. The highest concentration of S + NP was 1071.00μg / g, the treatment of M + NP was 940.85μg / g, the treatment of M was 776.90μg / g, respectively, increased by 1.86 times, 1.51 times and 1.07 times than CK. The single application of N fertilizer had little effect on soil bio-active carbon pool, which was 399.10 μg / g, only 6.4% more than CK and 621.60 μg / g, 65.76% more than CK. The application of organic fertilizer can significantly increase the soil bio-active organic carbon pool (C0), NP fertilizers also have good results, N fertilizer single application no significant effect. The percentage of soil organic carbon (C0) in soil was 2.70% ~ 6.34%, and the turnover rate (K) of soil organic carbon pool was 0.0223-0.0301d-1. The bio-active organic carbon pool Half turnaround (T1 / 2) in soils ranged from 22.55 to 31.09 days. Soil organic carbon pool (C0) had a significant positive correlation with soil total nitrogen and a significant positive correlation with total organic carbon (TOC).