长期施肥条件下红壤有机碳矿化对温度变化模式的响应
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(中国农业科学院农业资源与农业区划研究所 /耕地培育技术国家工程实验室,北京 100081)

作者简介:

刘金炜(1994-),男,山东淄博人,硕士研究生,主要从事土壤碳循环等方面研究。E-mail:liujinwei118@163.com。

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基金项目:中央公益性科研院所基本科研业务费专项(1610132019013和1610132019044);国家自然科学基金项目(41877105)。


Response of organic carbon mineralization to temperature changing pattern under long-term fertilization in red soil
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(Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences/National Engineering Laboratory for Improving Quality of Arable Land,Beijing 100081)

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    摘要:

    土壤有机碳(SOC)矿化是陆地生态系统碳循环的重要组成部分。土壤温度变化显著影响 SOC的矿化特征,然而长期施肥条件下周期性温度变化和恒定温度这两种温度模式对 SOC矿化影响的差异目前不清楚。本研究以湖南祁阳长期定位试验为平台,选取不施肥(CK)和有机无机肥配施(NPKM)2个处理,通过 60 d室内控制培养试验,对比研究相同积温条件下,恒温(25℃)和变温(20~ 30℃,以 25℃为均温)两种温度模式对 CK和NPKM处理土壤有机碳矿化特征的影响。研究结果表明,各处理 SOC矿化速率均在培养前期较高,且变温模式下SOC矿化速率显著高于恒温模式。培养结束后,各处理 SOC累积矿化量变化范围为 C 7.83~ 15.49 g·kg -1SOC;相较于恒温模式,变温模式下 CK和 NPKM处理 SOC累积矿化量分别增加了 98%和 57%(P<0.05),说明变温模式相对于恒温显著促进了 SOC矿化。在恒温模式下,CK处理 SOC累积矿化量(C 7.83 g·kg -1SOC)与 NPKM处理(C 8.77 g·kg -1SOC)相比无显著差异;而在变温模式下,CK处理 SOC累积矿化量(C 15.49 g·kg -1SOC)显著高于 NPKM处理(C 13.76 g·kg -1SOC),说明温度变化模式调控长期施肥对土壤有机碳矿化的影响。一级动力学方程模拟 SOC矿化特征的结果表明,与恒温模式相比,变温模式下 CK和 NPKM处理 SOC潜在矿化量分别显著提高了 3.90和 1.21倍,而 SOC周转速率常数显著降低了 71.6%和 40.7%。以上研究结果表明变温模式相对于恒温模式显著促进了土壤有机碳矿化,且温度变化模式可以调控土壤有机碳矿化对长期施肥的响应。

    Abstract:

    Soil organic carbon(SOC)mineralization plays an important role in terrestrial ecosystem carbon cycle.Soil temperature significantly influences SOC turnover.However,the differences in response of SOC mineralization toperiodically varying and constant temperature under long-term fertilization regimes remain unclear.In the present study,the soil subjected two long-term fertilization treatments(CK:no fertilization,NPKM:combined chemical fertilization with manure)was sampled in Qiyang Long-term Fertilization Experiment Station,and incubated at two temperature regimes(constant 25℃ and variable 25℃ with the same cumulative temperature)for 60 days,in order to investigate the response of SOC mineralization to temperature changing pattern.Results showed that SOC mineralization rate was significantly higher at variable temperature relative to the constant temperature.The cumulative amounts of SOC mineralization varied from C 7.83~15.49 g·kg-1 SOC across treatments at the end of incubation.Compared with constant temperature,cumulative SOC mineralization from CK and NPKM treatments increased by 98% and 57%(P<0.05),respectively,at variable temperature.These results suggested that variable temperature could significantly increase SOC mineralization.At constant temperature level,there was no significant difference in cumulative SOC mineralization between CK(C 7.83 g·kg-1 SOC)and NPKM(C 8.77 g·kg-1 SOC)treatments.However,cumulative SOC mineralization in NPKM treatment(C 13.76 g·kg-1SOC)was significantly lower than that in CK treatment(C 15.49 g·kg-1 SOC)at variable temperature level.These results indicated that temperature pattern change mediated the response of SOC mineralization to long-term fertilization.The first-order kinetics equation simulation results showed that SOC potential mineralization from CK and NPKM treatments significantly increased by 3.90 and 1.21 times,while SOC mineralization rate constant reduced by 71.6% and 40.7%,respectively,at variable temperature regime as compared to the constant temperature level.In conclusion,variable temperature could significantly increase SOC mineralization as compared to constant temperature level,implying that the temperature changing pattern mediates the SOC mineralization in response to long-term fertilization.

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刘金炜,张文菊,邬磊,王伯仁,徐明岗.长期施肥条件下红壤有机碳矿化对温度变化模式的响应[J].中国土壤与肥料,2020,(2):10-16.

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  • 收稿日期:2019-04-16
  • 最后修改日期:
  • 录用日期:2019-06-05
  • 在线发布日期: 2020-05-07