摘要
土壤有机碳矿化作用对生物地球化学循环有着至关重要的影响。本研究以冀北山区3种典型森林(落叶松林、白桦林和落叶松–白桦混交林)为研究对象,利用室内矿化培养实验测定和分析了不同林分、不同土层深度(0~10 cm和10~20 cm)以及二者的交互作用对土壤有机碳矿化的影响。研究结果表明,在整个培养期内,土壤有机碳的矿化速率呈现一致规律:培养前期速率波动较大,培养中后期矿化速率逐渐下降到较低水平并保持稳定。不同林分土壤有机碳累积矿化量存在显著差异,具体表现为白桦林 】白桦–落叶松混交林 】落叶松林,且白桦林的累积矿化量是落叶松林的1.52~2.53倍,是白桦–落叶松混交林的1.32~2.24倍;上层土壤(0~10 cm)的有机碳矿化速率和有机碳累积矿化量均显著高于深层土壤(10~20 cm),具体表现为落叶松林、白桦林和白桦–落叶松混交林上层土壤有机碳平均矿化速率分别是下层土壤有机碳平均矿化速率的1.83、2.56和1.55倍。林分类型和土层深度对土壤有机碳累积矿化量均存在极显著的差异(P 【0.0001),且存在显著的林分类型与土层深度交互性作用(P 【0.0001),说明林分类型,土层深度以及二者的交互作用均会对土壤有机碳矿化过程产生显著影响。
Soil organic carbon mineralization plays an important role in the biogeochemical cycle. In this study, the effects of different stands, different soil depths (0~10 cm and 10~20 cm) and their interaction were measured by indoor mineralization culture experiments in three typical forests (Larch forest, Birch forest, and Larch-Birch mixed forest) in northern Hebei. The results showed that the mineralization rate of soil organic carbon exhibited a consistent pattern throughout the whole culture period. In the early stage of culture, the mineralization rate fluctuated greatly, and gradually decreased to a lower level and remained stable in the middle and late stage of culture. There were significant differences in the accumulated mineralization of soil organic carbon in different stands, which was in the order of Birch forest >Mixed forest >Larch forest, and the accumulated mineralization of Birch forest is 1.52~2.53 times that of Larch forest and 1.32~2.24 times that of Mixed forest. The mineralization rate and accumulated mineralization amount of organic carbon in the upper soil (0~10 cm) were significantly higher than those in the subsoil (10~20 cm), which showed that the average mineralization rate of organic carbon in the upper soil of Larch forest, Mixed forest was 1.83, 2.56 and 1.55 times higher than that in the subsoil, respectively. Both stand types and soil depths had significant differences in soil organic carbon mineralization (P
出处
《土壤科学》
2022年第2期44-54,共11页
Hans Journal of Soil Science
