山西太岳山油松林土壤质量与有机碳稳定性随林龄的演变特征  

Evolutionary characteristics of soil quality and organic carbon stability with forest stand age for Pinus tabuliformis forests in the Taiyue Mountain of Shanxi Province,northern China

作　　者：周志勇[1,2] 徐梦瑶 王勇强 高雨 贾匡迪 Zhou Zhiyong;Xu Mengyao;Wang Yongqiang;Gao Yu;Jia Kuangdi(School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China;Shanxi Taiyueshan Long-Term Forest Ecosystem Research Station,Qinyuan 046500,Shanxi,China;The National Nature Reserve Bureau of Shanxi Lingkongshan Mountain,Qinyuan 046500,Shanxi,China)

机构地区：[1]北京林业大学生态与自然保护学院,北京100083 [2]山西太岳山森林生态系统国家定位观测研究站,山西沁源046500 [3]山西灵空山国家级自然保护区管理局,山西沁源046500

出　　处：《北京林业大学学报》2022年第10期112-119,共8页Journal of Beijing Forestry University

基　　金：林草科技创新发展研究项目(2022132265);中央高校基本科研业务费专项(PTYX202244)。

摘　　要：【目的】通过分析土壤质量和有机碳稳定性随林龄的变化特征,为合理评估森林生态系统功能的恢复进程提供理论支撑。【方法】选取山西太岳山区域4种林龄(20年、40年、80年和110年生)的油松林,分析其表层土壤的有机碳及其组分、黏粒含量、根系生物量和土壤酶活性等理化指标,以有机碳与黏粒含量的比例表征土壤的物理质量,以惰性有机碳与活性有机碳含量的比值表征土壤有机碳的稳定性。【结果】土壤的水分含量、土壤酶活性、铁铝氧化物含量都随着林龄的增长呈现增大趋势;土壤质量和有机碳稳定性都随着林龄的增长而增大,在0~10 cm土层,以40年生林地的土壤质量最低,为0.12,110年生林地的最高,为0.40,有机碳稳定也是在40年生林地最低,为2.69,110年生林地最高,为6.72,土壤质量与有机碳稳定性间存在极显著正相关关系。【结论】络合态铁、铝氧化物含量对土壤有机碳稳定性的提高发挥了积极的促进作用,而土壤水分、根系生物量和土壤酶活性则对土壤质量的改善发挥的作用更强一些。[Objective]The restoration progress of forest ecosystems could be reasonably evaluated by the analyses of variations in soil quality and soil organic carbon(SOC)stability with forest stand age.[Method]Four forest stands of Pinus tabuliformis at different ages(20 years,40 years,80 years and 110 years)were selected to analyze the soil physical quality and SOC stability and their determinants.The soil from these stands were analyzed for SOC fraction,clay content,root biomass and extracellular enzyme activities;soil quality was defined by the ratio of SOC to clay,and the stability of SOC was delineated by the ratio between recalcitrant carbon and labile carbon.[Result]The biophysical properties,i.e.,soil moisture content,soil hydrolase activity,and iron and aluminum oxides were modified along a chronosequence of P.tabuliformis forests.Simultaneously,both of the soil quality and SOC stability increased with forest stand age.During the soil depth of 0 to 10 cm,soil quality increased from 0.12 in the 40 years stand to 0.40 in the 110 years stand,and the SOC stability changed from 2.69 in the 40 years stand to 6.72 in the 110 years stand.A significant and positive correlation was found between soil quality and SOC stability across different forest stands.[Conclusion]The iron and aluminum oxides contribute more to sustaining the SOC stability,and the soil quality was modified more by soil moisture content,root biomass,and soil extracellular enzyme activities.

关 键 词：林龄 油松林 土壤质量 土壤有机碳稳定性 铁铝氧化物 

分 类 号：S791.254[农业科学—林木遗传育种] S714.5[农业科学—林学]