Summary
This study proposes the concept of nitrogen degradability to evaluate how farming activities affect soil nitrogen cycling in temperate continental monsoon climates. Analysis of 260 soil profiles across four soil types and seven vegetation categories revealed that black soil maintained more stable nitrogen levels with accumulation tendencies, whilst forest ecosystems contributed most to nitrogen deposition and maize cultivation showed net nitrogen loss. The findings provide empirical data to inform sustainable agricultural management and ecological balance in regions with similar climatic conditions.
UK applicability
The study's focus on temperate continental monsoon climate and specific soil types (dark brown, black, albic black, meadow soils) limits direct applicability to UK conditions, which differ markedly in climate regime and soil taxonomy. However, the methodological framework for assessing nitrogen degradability across farming systems may inform soil health assessment practices in UK agricultural monitoring, particularly regarding comparative nitrogen dynamics under different land uses.
Key measures
Soil pH, organic matter, total nitrogen, total phosphorus, total potassium, total soluble nitrogen, available phosphorus, available potassium; Pearson correlation analysis, principal component analysis, one-way ANOVA across soil types and vegetation categories
Outcomes reported
The study quantified nitrogen degradability across 260 soil profiles under different farming systems and vegetation types, measuring soil nitrogen characteristics and their relationship to land-use practices. Forest vegetation showed the strongest nitrogen deposition, whilst maize cultivation exhibited a tendency towards nitrogen loss compared to forests.
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