不同冻结温度黑土渐次解冻过程有机碳矿化特征及影响因素

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Abstract The process of soil freezing and thawing, due to the severe changes of temperature and the two-phase transformation of ice and water, can profoundly reorganize the spatial distribution pattern of water, salt, nutrients and microorganisms within the soil matrix. The freezing temperature determines the structure and migration rate of the freezing front, which consequently affects the migration and diffusion efficiency of water, salt and nutrients and hence perturbs soil organic carbon mineralization. In this study, a mollisol (particle size < 2mm) was re-filled into soil columns, rewetted to field capacity (41%), respectively frozen at -10℃, -15℃ and -20℃ for 12h, and then thawed at 10℃. Individual soil columns were gradually peeled from the outside to the inner core into six layers (T1~T6) while progressively thawing, to capture the redistribution patterns of soil water, salt and nutrients during freeze-thaw. The results show that:1) The outmost layer T1had the highest water content (48.9%~61.9%), but the inner core T6 was drier with the lowest water content (29.3%~35%), and such polarized distributions of moisture were most significant in the soil columns frozen at -20℃. On the contrary, the electrical conductivity (EC) was higher in the outer layer T1and inner layer T6 (53.9~66.4μS/cm and 55.0~64.0μS/cm), but lowest in the middle layer T3 (53~56.5μS/cm). The difference of EC among the soil layers was most significant for the soil column frozen at -10℃. 2) The dissolved organic carbon (DOC) gradually decreased, but the soil microbial biomass carbon (SMBC) increased, from the outer layer T1to the inner core T6. Such patterns were more pronounced when the soil columns experienced lower freezing temperature. 3) The CO₂ emission rate was higher in the outer layer T1 and inner core T6 (34~40.7μg/g and 33.5~63μg/g), but lower in the middle layer T4 (23.7~25.0μg/g). The soil columns after frozen at -10℃ released significantly less CO₂ than those frozen at -20℃. 4) The SMBC was negatively linearly correlated with DOC, but positively linearly correlated with CO₂ emission rate, suggesting that freezing can neutralize microbes, and the thus released dissolved nutrients can promote the survived microbes to respire during thawing. Our findings show that, peeling off the progressively thawed soil layers from the frozen core can effectively capture the polarized distribution of biophysiochemical properties and the potential impacts on carbon mineralization. Different freezing temperatures regulated the inter-layer heterogeneity over progressive thawing, further pointing to the limitation and thus partial understanding of freeze-thaw impacts on soil carbon mineralization if merely based on conventional investigations after complete thawing.

Key words： freeze-thaw temperature water-salt soil microbes CO₂ emissions

Received: 07 July 2022

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X142

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	LIU Hui-min
	SONG Yuan
	LI Xian-wen
	HU Ya-xian

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LIU Hui-min,SONG Yuan,LI Xian-wen等. Influences of freezing temperature on the inter-layer variations of mollisol organic carbon mineralization over progressive thawing[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1288-1297.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1288

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