土壤有机的变化是由典型的地区域的各种农业生态系统塑造的:来自同位素地质化学的证据
Ruiyin Han1,2, Qian Zhang3, Zhifang Xu1,2,4
1Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.
PeerJ
|April 19, 2024
概括
土壤有机 (SON) 含量因地生态系统而异. 适度放牧增加了SON,降低了土壤退化风险,这表明优化作物和牲畜系统有利于可持续发展.
科学领域:
- 土壤科学 土壤科学
- 农业生态学 农业生态学
- 同位素地球化学 同位素地球化学
背景情况:
- 土壤有机 (SON) 对土壤生产力至关重要,并对作物代谢作出反应.
- 带有脆弱生态系统的卡斯特地区缺乏使用同位素追踪对SON动态的详细研究.
- 了解SON动态对于在环境和人为压力下管理农业生态系统至关重要.
研究的目的:
- 为了研究土壤有机 (SON) 含量和稳定的N同位素 (δ15NSON) 组成,跨越各种地生态系统.
- 阐明控制SON动态和 δ15NSON变化的因素,以应对土地使用变化.
- 评估土地利用实践对土壤健康和卡斯特地区可持续发展的影响.
主要方法:
- 实地采样土壤有机 (SON) 含量和稳定的N同位素 (δ15NSON) 组成.
- 在典型的地区域中,在废弃的耕地 (AC),放牧灌木地 (GS) 和二级森林土地 (SF) 中分析SON和δ15NSON.
- 统计分析以确定土地利用,环境因素和SON动态之间的关系.
主要成果:
- 土壤有机 (SON) 含量在放牧灌木地 (GS) (0.31%) 与二级森林土地 (SF) (0.09%) 和废弃耕地 (AC) (0.10%) 相比最高.
- δ15NSON值因土地用途而异,受植被覆盖和微生物活动的影响.
- 富含15N的山羊便显著影响了放牧区的δ15NSON成分.
结论:
- 长期耕种消耗了SON,而适度放牧则增强了它,减轻了土壤退化.
- 植被类型和土地利用实践,如山羊放牧和作物种植,是SON动态和同位素特征的关键驱动因素.
- 优化农作物和畜牧业的整合为卡斯特地区可持续农业生态系统发展提供了可行的战略.
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