和石灰应用对植物微生物相互作用和半干旱草原中的土壤碳稳定性的长期影响
Kwenama Buthelezi1, Nkosinomusa Buthelezi-Dube1
1School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, P. Bag X01, Scottsville, Pietermaritzburg 3201, South Africa.
Plants (Basel, Switzerland)
|May 14, 2025
概括
在南非草原长期化和化增加了植物生物质,但没有影响土壤碳. 固体测量失衡和pH限制解释了这种脱节,影响了植物微生物相互作用.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 农业学是一种农业学.
背景情况:
- 对半干旱草原生态系统的长期 (N) 化肥和化效应尚未完全理解.
- 了解植物微生物相互作用对于土壤碳稳定性至关重要.
研究的目的:
- 为了研究70年的化 (酸,硫酸) 和化对半干旱草原中的植物微生物动力学和土壤有机碳 (SOC) 的影响.
- 为了确定植物固态度和微生物活动的变化如何在不同的N输入和pH条件下影响碳封存.
主要方法:
- 在70年内进行了N肥 (70和211公斤N/ha) 和石灰的实地实验.
- 对地表和地底生物质,植物N体化学,微生物生物质碳,脱酶和尿酸酶活动的分析.
- 主要成分分析 (PCA) 用于评估治疗对植物和微生物参数的影响.
主要成果:
- 添加显著增加了地面和地下生物质,酸在211公斤N/ha时产生了最大的增加.
- 化肥改变了植物N体质量,而石灰和N处理不同影响了微生物活动 (例如脱酶,尿素酶).
- 尽管生物质增加了,但SOC保持稳定,土壤pH值在处理过程之间有显著差异.
结论:
- 植物-微生物的立体测量不平衡和pH诱导的微生物限制阻碍了碳捕获,尽管在这个草原植物的生产力增加.
- 的形式和应用率对植物分配和微生物功能产生不同的影响,突出显示了复杂的生态系统反应.
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