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土壤活性有机碳作为土壤有机碳中活跃的化学组分,在全球碳循环中起着非常重要的作用.为了探究生物质炭输入对土壤活性有机碳的影响,以苹果枝条为原料,在300~600℃条件下制备生物质炭,在研究生物质炭基本理化性质的基础上,通过室内培养试验研究生物质炭输入对土壤活性有机碳的影响.结果表明:高温制备的生物质炭碳(C)的质量分数增加,而氢(H)和氧(O)质量分数下降,H/C及O/C比下降;生物质炭的脂肪族结构减弱,芳香性增强,稳定性升高;生物质炭输入可以显著增加土壤有机碳(SOC)含量(P<0.05),且随着添加比例的增加而增加,其中以500℃制备的生物质炭对土壤有机碳库的提升效果最为明显;与对照相比,低温(≤400℃)制备的生物质炭在培养期间增加了土壤微生物量碳(MBC)、水溶性有机碳(WSOC)以及易氧化有机碳(ROC)的含量,且随着添加比例的增加而增加,培养360 d后,BC300处理平均分别增加了38.25%、82.09%和63.53%;BC400处理平均分别增加了26.07%、65.61%和48.09%,且差异均达到显著水平(P<0.05);高温(>400℃)制备的生物质炭在培养初期(<40~60 d)增加了土壤MBC、WSOC及ROC含量,且随着添加比例的增加而增加,而在培养后期则减少了土壤MBC、WSOC、ROC含量,且随着添加比例的增加而减少,培养360 d后,BC500处理平均分别减少了0.27%、13.48%和14.67%,BC600处理平均减少7.80%、14.66%和15.79%,且差异达到显著水平(BC500处理MBC含量除外)(P<0.05);生物质炭输入降低了土壤有机碳中ROC的比例,并且随着热解温度的升高以及添加比例的增加而降低.从提升土壤有机碳库及生物活性等方面考虑,在黄土高原土地区,500℃条件下制备生物质炭,既能保证有机碳具有较高的稳定性,又不至于引起土壤活性碳库的过度降低,是生物质炭在农田土壤利用的最佳制备温度.
Soil active organic carbon plays an important role in the global carbon cycle as an active chemical component of soil organic carbon.In order to explore the effect of biomass carbon input on soil active organic carbon, The effect of biomass carbon input on soil active organic carbon was studied by indoor culture experiment on the basis of studying the basic physical and chemical properties of biomass carbon at 600 ℃ .The results showed that the biomass carbon The content of hydrogen (H) and oxygen (O) decreased and the ratio of H / C and O / C decreased. The aliphatic structure of biomass charcoal decreased, the aromaticity increased and the stability increased. (P <0.05), and increased with the increasing of the proportion of the soil organic carbon (SOC). The results showed that the biomass charcoal prepared at 500 ℃ had the most obvious enhancement effect on the soil organic carbon pool. Compared with the control (MBC), water-soluble organic carbon (WSOC) and organic-carbon (ROC) content increased with the increasing of the proportion of biomass carbon And increase, after training 360 d, BC300 The mean increase of BC400 treatment was 38.25%, 82.09% and 63.53%, respectively. The average BC400 treatment increased by 26.07%, 65.61% and 48.09% respectively, with a significant difference (P <0.05) The content of MBC, WSOC and ROC in soil increased with the increase of the proportion of material carbon in the early stage of culture (<40-60 d), but decreased in the later stage of culture, and with the increase of MBC, WSOC and ROC The BC500 treatment decreased by 0.27%, 13.48% and 14.67% on average after 360 days of culture, while the average BC600 treatment decreased by 7.80%, 14.66% and 15.79%, and the difference reached significant level (BC500 treatment MBC content (P <0.05). The input of biomass carbon reduced the proportion of ROC in soil organic carbon, and decreased with the increase of pyrolysis temperature and addition ratio. From improving soil organic carbon pool and biological activity, Considering that the preparation of biomass carbon at 500 ℃ in the loess plateau area can not only ensure the high stability of organic carbon but also not cause excessive reduction of soil active carbon pool, The best preparation temperature.