典型黑土区坡面侵蚀-沉积对土壤微生物养分限制的影响

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Abstract A typical sloping cropland with a hundred-year cultivation in Keshan County of Heilongjiang Province was selected and soil erosion-deposition ratesestimated by ²¹⁰Pb_ex tracer technique were used to classify soil erosion intensity grades [including deposition (DS), light erosion (LE), moderate erosion (ME), intense erosion (IE) and severe erosion(SE)] in this study. Then differences of soil carbon, nitrogen, phosphorus contents, microbial biomass and extracellular enzyme activities among soil erosion intensity grades were investigated and effects of soil erosion-deposition on soil microbial nutrient limitations based on vector model of enzymatic stoichiometry were assessed. The results were as follows: soil erosion-deposition rates ranged from -782.7 to 10914.5t/(km²·a), with an average of 3507.6t/(km²·a); sloping spatial distribution patterns of soil erosion-deposition displayed that the LE and ME were mainly found at the upper slope positions and nearby the deposition sites, the IE and SE were mainly observed at the middle slope positions, and the DS was mainly located at the slope toe. Soil carbon, nitrogen, phosphorus contents and microbial biomass generally decreased with an increase in soil erosion intensity grade. The activities of soil carbon acquiring enzyme (BG+CBH) and nitrogen acquiring enzyme (NAG+LAP) were the highest at the DS sites, while soil phosphorus acquiring enzyme activities (ACP) was the highest at the SE sites. Soil microorganisms were co-limited by relative carbon and phosphorus using the vector model of enzymatic stoichiometry; soil microbial relative carbon limitation indicated by the vector length(VL) decreased linearly with an increase in soil erosion rates and a decrease in soil deposition rates, whereas its relative phosphorus limitation indicated by the vector angle(VA) increased linearly, which indicated that soil microorganisms were relatively prominent restricted by soil phosphorus in the study area. The variations of soil enzyme activities and microbial nutrient limitations at different soil erosion intensity grades were contributed 60.1% by soil nutrient contents and microbial biomass, in which soil organic presented the highest explanation under the conditional effect with 17.4%. Overall, the impacts of soil erosion and deposition on soil quality were caused by corporate influences of soil properties and microbial nutrient limitations.

Key words： Mollisol soil erosion-deposition soil enzyme activity soil microbial nutrient limitation

Received: 08 October 2022

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X172

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	MO Shuai-hao
	WANG Xue-song
	ZHENG Fen-li
	QIN Qi-shan
	WANG Yi-fei
	AN Xiao-bing
	WANG Lun
	HU Wen-tao
	ZHANG Jia-qiong

Cite this article:

MO Shuai-hao,WANG Xue-song,ZHENG Fen-li等. Effects of slope erosion-deposition on soil microbial nutrient limitation in the typical Mollisol region of Northeast China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(6): 3023-3033.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I6/3023

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