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以江苏东台林场5年生杨树人工林为对象,在2012年6月设置了不同施肥处理(N、P、K复合肥,T1;有机肥,T2;生物炭,T3;N、P、K复合肥+生物炭,T4;有机肥+生物炭,T5;对照,CK),并在2012年8月至2013年6月期间每2个月1次共进行6次重复土壤取样,研究了不同施肥模式对土壤微生物生物量C、N、P(SMBC、SMBN、SMBP)的影响。结果显示:15种施肥模式均显著提高了SMBC和SMBN,但对SMBP的影响较小,仅T1处理与对照间达到显著性差异;2在0~10 cm土层仅T5处理显著降低了SMBC与SMBN的比值,在≥10~25 cm土层各处理SMBC与SMBN的比值均未显著下降,而在≥25~40 cm土层T1、T2、T4和T5处理的SMBC与SMBN的比值均显著下降,表明不同施肥模式对土壤N供应能力的改善作用随土层深度的增加而增加。综合分析表明,T4处理最有利于提高杨树人工林SMBC、SMBN和SMBP的含量,同时有利于提高土壤对植物生长所需有效N的供给,因此T4处理即N、P、K复合肥+生物炭可作为该区域杨树人工林的最佳施肥模式。
A five-year-old poplar artificial forest in Dongtai Forest Farm of Jiangsu Province was set as the target. In June 2012, different fertilization treatments (N, P and K compound fertilizer, T1; organic fertilizer, T2; biochar and T3; N, P, Fertilizer + biochar, T4; organic fertilizer + biochar, T5; CK). Six soil samples were repeated every two months from August 2012 to June 2013, Effects of Different Patterns on Soil Microbial Biomass C, N, P (SMBC, SMBN, SMBP). The results showed that: 15 kinds of fertilization modes significantly increased SMBC and SMBN, but had little effect on SMBP, only significant difference was found between T1 and control; 2 T5 treatment at 0-10 cm significantly reduced SMBC and SMBN SMBN, the ratio of SMBC to SMBN did not decrease significantly in ≥10 ~ 25 cm soil layer, while the ratio of SMBC to SMBN in T1, T2, T4 and T5 ≥25 ~ 40 cm soil layer decreased significantly , Indicating that the improvement effect of different fertilization modes on soil N supply ability increased with the increase of soil depth. Comprehensive analysis showed that T4 treatment was the most conducive to improve poplar plantation SMBC, SMBN and SMBP content, while helping to improve soil available N supply of plant growth, so T4 treatment that N, P, K fertilizer + bio Carbon can be used as the best poplar plantation in this region fertilization mode.