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| 植被恢复下喀斯特土壤有机碳稳定性分异特征 |
| Differentiation Characteristics of Organic Carbon Stability in Karst Soil under Vegetation Restoration |
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| DOI: |
| 中文关键词: 有机碳 惰性有机碳 稳定性 分异特征 植被恢复 喀斯特 土壤 |
| 英文关键词: Organic carbon Recalcitrant organic carbon Stability Differentiation characteristic Vegetation restoration Karst Soils |
| 基金项目:国家自然科学基金资助项目(42367031);贵州省科技支撑基金资助项目(黔科合支撑 〔2023〕一般204;黔科合支撑 〔2023〕一般141);贵州省基础研究计划基金资助项目(黔科合基础MS〔2025〕 326) |
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| 中文摘要: |
| 以黔中喀斯特典型区普定县城关河流域为对象,采用野外采样与实验室分析相结合的方法,系统研究了草地、乔木林地和灌丛3种植被类型的0cm~20cm表层土壤有机碳(SOC)稳定性特征及其驱动因素。结果表明:土壤惰性有机碳(ROC)和SOC值均表现为灌丛(2420 g/kg和4030 g/kg)>乔木林地(2175 g/kg和3648 g/kg)>草地(1560 g/kg和2830 g/kg),惰性有机碳指数(ROCI)乔木林地最高(5809%);植被类型通过调控土壤颗粒组成和养分影响碳稳定性,乔木林地ROCI受黏粒(正相关)和砂粒(负相关)主导,灌丛与TN、N/P、C/P呈正相关,而区域尺度则由TN、粉粒、N/P和C/P正向驱动;生态恢复可有效逆转耕作对SOC的抑制作用,证实植被恢复可提升土壤碳固存能力。 |
| 英文摘要: |
| Taking the Chengguan River basin in Puding County, a typical karst region in central Guizhou, as the study area, this article systematically studied the stability characteristics and driving factors of soil organic carbon(SOC) in the 0 cm~20 cm surface layer in grassland, arbor forestland and shrubland by field sampling and laboratory analysis. The results showed that the contents of recalcitrant organic carbon(ROC) and SOC followed the order: shrubland(2420 g/kg and 4030 g/kg) > arbor forestland(2175 g/kg and 3648 g/kg) > grassland(1560 g/kg and 2830 g/kg). The recalcitrant organic carbon index(ROCI) in arbor forestland soil was the highest(5809%). Vegetation types affected carbon stability by regulating soil particle composition and nutrients. The ROCI in arbor forestland soil was dominated by soil clay(positively correlated) and sand(negatively correlated), while in shrubland soil, it was positively correlated with total nitrogen(TN), N/P and C/N, and at the regional 〖GK!87mm〗scale, it was positively driven by TN, silt, N/P and C/P. Ecological restoration effectively reversed the inhibitory effect of tillage on SOC, confirming that vegetation restoration could enhance carbon sequestration capacity in soil. |
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