平滑的覆盖对土壤聚合物中不同来源的碳积累的影响
Meng Zhang1, Rui-Mei Cheng1,2, Ya-Fei Shen1,2
1Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing 100091, China.
概括
绿色肥料,特别是光滑,通过增加微生物死体,特别是真菌衍生的碳,在土壤聚合物中增强土壤有机碳. 这种微生物碳主导着土壤有机碳储存的变化.
科学领域:
- 土壤科学 土壤科学
- 农业学是一种农业学.
- 微生物学 微生物学
背景情况:
- 土壤有机碳 (SOC) 稳定性对土壤健康至关重要,受到微生物和植物衍生的碳投入的影响.
- 绿色肥料的应用,如光滑的,是改善土壤肥沃性和碳捕获的常见做法.
- 了解不同土壤聚合物中碳的来源和命运是优化土壤管理策略的关键.
研究的目的:
- 为了研究光滑的绿色肥对微生物和植物衍生的碳在各种土壤聚合物大小 (大宏积聚物,小宏积聚物,微积聚物) 的积累和贡献的影响.
- 确定真菌和细菌死体和素对绿色肥料下总有机碳的相对贡献.
- 识别关键的土壤特性和微生物活动,驱动土壤聚合物中的碳积累和转化.
主要方法:
- 实地实验比较了在果园中光滑的覆盖和干净的耕作.
- 在土壤聚合物 (2-8毫米,0.25-2毫米,<0.25毫米) 中分析碳来源 (微生物死体,烯) .
- 测量土壤有机碳,微生物生物质碳,酶活动 (白氨基酶) 和矿物质含量 (氧化铁).
主要成果:
- 顺显著增加了真菌和微生物死体碳,特别是在微聚合物中,真菌死体占据了微生物碳积累的主导地位.
- 植物衍生碳 (木质) 在大型宏积聚物中减少,但在光滑底下的微积聚物中增加,对总有机碳的贡献有所不同.
- 土壤有机碳,微生物生物质碳,氨基酶,可交换和复杂的氧化铁含量被确定为影响碳积累和转化的关键驱动因素.
结论:
- 顺的绿色肥料促进了微生物死体碳的积累,主要来自真菌,在土壤聚合物中.
- 植物衍生碳可以转化为微生物碳,并储存在土壤中,特别是在更大的聚合物中.
- 微生物衍生的碳在调节不同聚合物分数内的土壤有机碳变化方面发挥着主导作用.
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