王 楠, 王 洋, 崔政武, 袁玉玉, 徐林浩, 张珂瑜. 冻融作用与含水量对黑土中活性有机碳的影响[J]. 土壤通报, 2024, 55(4): 953 − 959. DOI: 10.19336/j.cnki.trtb.2023083101
引用本文: 王 楠, 王 洋, 崔政武, 袁玉玉, 徐林浩, 张珂瑜. 冻融作用与含水量对黑土中活性有机碳的影响[J]. 土壤通报, 2024, 55(4): 953 − 959. DOI: 10.19336/j.cnki.trtb.2023083101
WANG Nan, WANG Yang, CUI Zheng-wu, YUAN Yu-yu, XU Lin-hao, ZHANG Ke-yu. The Influence of Freeze-thaw Effect and Moisture Content on Active Organic Carbon in Black Soil[J]. Chinese Journal of Soil Science, 2024, 55(4): 953 − 959. DOI: 10.19336/j.cnki.trtb.2023083101
Citation: WANG Nan, WANG Yang, CUI Zheng-wu, YUAN Yu-yu, XU Lin-hao, ZHANG Ke-yu. The Influence of Freeze-thaw Effect and Moisture Content on Active Organic Carbon in Black Soil[J]. Chinese Journal of Soil Science, 2024, 55(4): 953 − 959. DOI: 10.19336/j.cnki.trtb.2023083101

冻融作用与含水量对黑土中活性有机碳的影响

The Influence of Freeze-thaw Effect and Moisture Content on Active Organic Carbon in Black Soil

  • 摘要:
    目的 明确冻融条件对土壤活性有机碳影响程度,为黑土区有机碳保持和碳平衡的研究提供基础数据和理论依据。
    方法 以德惠地区典型中层黑土为研究对象,通过冻融控制试验,研究不同冻融频次、冻结时间、冻融温度及土壤含水量对土壤活性有机碳的影响。
    结果 土壤活性有机碳组分对冻融条件的响应差异显著。土壤可溶性有机碳、轻组有机碳、颗粒有机碳含量随着冻融频次的增加逐渐增加,当冻融20次后,含量变化幅度较小,逐渐趋于稳定;土壤微生物量碳含量在冻融12次后处于0.160 ~ 0.164 g kg−1之间波动。冻结温度降低、融化温度升高均可促进土壤可溶性有机碳、轻组有机碳和颗粒有机碳含量增加,而土壤微生物量碳含量则随冻结温度的降低而降低,随融化温度的升高而增加,但含量仍比对照处理低10.42% ~ 24.48%。土壤可溶性有机碳、轻组有机碳和颗粒有机碳含量随着冻结时间的增加差异显著,冻结时间为12 ~ 48 h时,增幅较大;冻结时间增加使得土壤微生物量碳含量显著降低,冻结时间为96 h时,降幅可达52.60%。随着土壤含水量增加可溶性有机碳、轻组有机碳和颗粒有机碳含量逐渐增加,当含水量为田间持水量的80% ~ 100%时,轻组有机碳含量增加最显著,增幅达到9.69% ~ 38.48%;而土壤微生物量碳含量则逐渐降低,当含水量为田间持水量的80% ~ 100%时,含量降低不显著。
    结论 冻融循环有利于增强或维持土壤有机碳含量,频繁的冻融作用能够提高部分活性有机碳组分含量,促进土壤养分循环。

     

    Abstract:
    Objective Conducting research on the impact of freeze-thaw conditions on soil active organic carbon can provide basic data and theoretical basis for the study of organic carbon conservation and carbon balance in black soil areas.
    Method Taking typical middle layer black soil in Dehui area as the research object, the effects of different freeze-thaw cycles, freezing time, freeze-thaw temperature, and moisture content on soil active organic carbon were investigated through freeze-thaw control experiments.
    Result There were significant differences in the response of soil active organic carbon components to freeze-thaw conditions. The content of Dissolved Organic Carbon (DOC), Light Organic Carbon (LFOC), and Particulate Organic Carbon (POC) in soil gradually increases with the increase of freeze-thaw cycles, and the growth rate slows down after 20 freeze-thaw cycles; Soil Microbial Biomass Carbon (MBC) fluctuates between 0.160 g kg−1 and 0.164 g kg−1 after 12 freeze-thaw cycles. Both a decrease in freezing temperature and an increase in melting temperature can promote an increase in soil DOC, LFOC, and POC content, while the soil MBC content decreases with a decrease in freezing temperature and increases with an increase in melting temperature. However, the content still decreases by 10.42% to 24.48% compared to the control state. The content of soil DOC, LFOC, and POC showed significant differences with the increase of freezing time, with a significant increase from 12 to 48 hours; The increase in freezing time resulted in a significant decrease in soil MBC content, with a decrease of 52.60% at 96 hours of freezing time. As the moisture content increases, the content of soil DOC, LFOC, and POC gradually increases. When the relative moisture content is between 80% and 100%, the increase in LFOC content is most significant, ranging from 9.69% to 38.48%; The soil MBC content gradually decreases, and the decrease tends to be gradual when the relative water content is between 80% and 100%.
    Conclusion The freeze-thaw cycle is beneficial for enhancing or maintaining soil organic carbon, and frequent freeze-thaw cycles can increase the content of some active organic carbon components and promote soil nutrient cycling.

     

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