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Soil organic carbon fractions and management index after 20 yr of manure and fertilizer application for greenhouse vegetables

机译：大棚蔬菜施肥20年后土壤有机碳组分及管理指数

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Impacts of organic manure and inorganic fertilizer on total organic carbon (C-T), water-soluble organic C (C-WS), microbial biomass C (C-MB), particulate organic C (C-P), labile organic C (C-L), C storage and sequestration, and C management index (CMI) in surface soil (0-20 cm) were investigated in a 20-yr field experiment under a greenhouse vegetable system in northeast China. The treatments included unfertilized control (CK), N fertilizer (N), balanced NPK fertilizer (NPK), organic manure alone (M) and the NPK fertilizer combined with the manure (MNPK). Under the treatments of N and NPK, C-T content and C storage were not significantly changed over the experimental period, while C-WS, C-MB, C-P, C-L concentrations and CMI were significantly increased compared with the unfertilized control. In comparison with the control, the manure treatments, M and MNPK, significantly increased C-T content and C storage, sequestrating organic C of 8.9 and 9.2 Mg/ha, respectively. The M and MNPK treatments showed higher C-WS, C-MB, C-P and C-L concentrations and CMI than the other three treatments. Pearson's correlation coefficients were used to show that C-WS, C-MB, C-P, C-L and CMI could be useful indicators for assessing soil quality and total C changes. The M treatment is effective in sequestrating soil C, but resulted in lower crop yield compared with the NPK treatment. The MNPK treatment showed the greatest increases in crop yield and C sequestration in the greenhouse vegetable system.
机译：有机肥料和无机肥料对总有机碳（CT），水溶性有机碳（C-WS），微生物生物量C（C-MB），颗粒有机C（CP），不稳定有机C（CL），C的影响在中国东北的温室蔬菜系统下进行了20年的田间试验，研究了表土（0-20厘米）中的储藏和固存以及碳管理指数（CMI）。处理包括未施肥的对照（CK），氮肥（N），平衡氮磷钾肥（NPK），仅有机肥（M）和氮磷钾与肥料结合的肥料（MNPK）。在氮和氮磷钾的处理下，C-T含量和C贮藏在实验期间没有显着变化，而C-WS，C-MB，C-P，C-L浓度和CMI与未受精对照相比显着增加。与对照相比，粪肥处理M和MNPK显着增加了C-T含量和C储存量，分别将有机碳封存为8.9 Mg / ha和9.2 Mg / ha。 M和MNPK处理显示出比其他三种处理更高的C-WS，C-MB，C-P和C-L浓度和CMI。皮尔逊相关系数用于表明，C-WS，C-MB，C-P，C-L和CMI可能是评估土壤质量和总碳变化的有用指标。 M处理可有效隔离土壤C，但与NPK处理相比，农作物产量较低。 MNPK处理在温室蔬菜系统中显示出最大的作物增产和碳固存。

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