中国水土保持科学2025，Vol.23Issue(5)：47-58,12.DOI:10.16843/j.sswc.2024131
历山不同海拔森林土壤团聚体稳定性及有机碳贡献
Soil aggregate stability and organic carbon contribution in Mountain Li along an elevational gradient
摘要
Abstract
[Background]Soil aggregates can reflect the carrying capacity and carbon sequestration capacity of soil.Studying the elevation gradient pattern and influencing factors of aggregates stability and organic carbon contribution is of great significance for understanding the changes in soil structure and carbon sequestration potential in the vertical space of forest ecosystems at the local scale and their driving mechanisms.[Methods]First,we adopted the five-point sampling method to sample the soil at 8 permanent forest sites(400 m2)along an elevational gradient ranging from 890 to 2 200 m in Mountain Li,a warm-temperate forest region in Shanxi province.Then,we obtained three kinds of aggregates with different particle sizes by the dry sieving method and calculated their respective contents.Meanwhile,we determined the physical and chemical properties of the soil,such as pH,total nitrogen,organic carbon,etc.We also obtained soil microorganisms through high-throughput sequencing methods and calculated the diversity of plants and soil microorganisms.Finally,we used statistical software for data analysis and plotting.[Results]1)The composition of soil aggregates was mainly medium aggregates(0.25-2.00 mm),followed by large aggregates(>2.00 mm),and the least small aggregates(≤0.25 mm)at each elevation.2)MWD and GMD showed a"U"-shaped variation trend at elevation(R2=0.32,P<0.001;R2=0.40,P<0.001).3)The contribution of total organic carbon in aggregates was 0.03-0.08 g/g,and it showed a linear upward trend with the increase at elevation(R2=0.48,P<0.001).4)MWD and GMD were significantly positively correlated with soil pH,total phosphorus,total nitrogen,soil water content,clay,as well as the content of large aggregates and the organic carbon contents in medium and small aggregates.It was significantly negatively correlated with silt,species richness,plant Simpson index,mean annual temperature and the content of small aggregates.In addition,GMD was also significantly negatively correlated with precipitation.5)The partial least squares path model indicated that environmental factors can respectively explained 96.6%of the variation in soil aggregate stability with elevation and 87.7%of the variation in total organic carbon contribution with elevation.Soil physicochemical properties and plant diversity indirectly affected stability by influencing the content of large aggregates and the organic carbon contents in medium and small aggregates(P<0.05,with a path coefficient of 0.92;P<0.05,with a path coefficient of 0.17),which further affected contribution of total organic carbon(with a path coefficient of 0.06).In addition,the contribution of total organic carbon was not only directly affected by the organic carbon contents of medium and small aggregates(P<0.05,with a path coefficient of 0.96),but also directly affected by the content of large aggregates(P<0.05,with a path coefficient of-0.21).[Conclusions]This study emphasizes the driving process of environmental factors on soil aggregate stability and organic carbon contribution and clarifies the direct and indirect effects of various environmental factors on aggregate stability and organic carbon contribution.The results may provide important basis for scientific forest management,enhancing soil carbon sequestration potential,effectively increasing forest productivity and soil and water conservation capacity,promoting ecosystem health and sustainable development in the region.关键词
团聚体/稳定性/有机碳/海拔梯度/亚热带-暖温带森林过渡区Key words
aggregate/stability/organic carbon/elevation gradient/subtropical-warm temperate forest transition zone分类
林学引用本文复制引用
任宇辰,王晨林,宋厚娟,杨秀清,杨杰艳,王雅茹,刘洋,王馨悦,张雄志,李海波,王晶晶,张慧芳..历山不同海拔森林土壤团聚体稳定性及有机碳贡献[J].中国水土保持科学,2025,23(5):47-58,12.基金项目
国家自然科学基金"中国特有常绿阔叶栎属植物在其分布区北缘对气候变化的响应与适应"(32301401) （32301401）
山西省基础研究计划项目"山西暖温带森林微气候对植物多样性海拔梯度格局的影响机制"(202103021223151) （202103021223151）
研究生创新项目"基于宏基因组学解析森林微气候对土壤固碳微生物沿海拔梯度变化的影响"(2023KY315) （2023KY315）
研究生创新项目"山西暖温带森林海拔梯度上微生物资源限制、酶活性、群落组成及其引起的土壤碳变化"(2024KY313) （2024KY313）
山西农业大学博士科研启动项目"山地生物多样性的分布规律及其驱动因素研究"(2021BQ109) （2021BQ109）
