南京师大学报（自然科学版）2025，Vol.48Issue(2)：62-73,12.DOI:10.3969/j.issn.1001-4616.2025.02.007
福建海岸防护林土壤矿质氮库及氮矿化动态
Seasonal Variations in Soil Nitrogen Mineralization Under Protection Forest in Coastal Sand Dune of Fujian Province
摘要
Abstract
The objective of this study was to explore the characteristics of nitrogen(N)mineralization and the variation in soil inorganic N levels.Additionally,it aimed to reveal the mechanisms governing mineralization and provide a theoretical basis for the sustainable management of protection forests in the coastal sand dunes of Fujian Province.Five types of protective forests were selected,namely Secondary forests,Casuarina equisetifolia plantations,Pinus elliottii plantations,Acacia crassicarpa plantations,and Eucalyptus urophylla×E.Grandis plantations.The continuous cultivation method was adopted to compare the soil mineral N pool and N mineralization rates in the 0-10 cm soil layer among different protection forests.Moreover,the relationship between soil N mineralization and environmental factors was investigated.(1)The Secondary forests showed a significantly higher total mineral N content in comparison to the plantations.Among the plantations,Acacia crassicarpa had the highest levels of ammonium N and total mineral N.In the Secondary forests,nitrate N was the dominant form of inorganic N,accounting for 67.25%of the total.In contrast,the soil nitrate N content in the plantations ranged from 11.83%to 27.53%.(2)Both N mineralization and nitrification rates exhibited significant seasonal fluctuations.The annual mean soil N mineralization and nitrification rates in the Secondary forests were notably higher than those in the plantations.Remarkably,the soil N mineralization rate in the Acacia crassicarpa plantation was significantly higher than that in the other plantations.(3)The mean soil N mineralization rate during the growing season for all 5 forest types was significantly higher than that during the non-growing season.Similarly,the mean nitrification rate during the growing season in the Secondary forests,Acacia crassicarpa plantations,and Casuarina equisetifolia plantations was significantly higher than that during the non-growing season.(4)The soil mineral N content and N conversion rate were significantly and positively correlated with soil pH,total N,available phosphorus,soluble organic carbon(C),soluble organic N,litter N content,fine root N content,and microbial biomass C and N content.Conversely,they were significantly and negatively correlated with soil bulk density,litter C∶N ratio,and root C∶N ratio.The soil N mineralization rate in the Secondary forests and Pinus elliottii plantations was mainly controlled by temperature and moisture,while in the Eucalyptus urophylla×E.Grandis plantation,it was predominantly controlled by soil moisture.In the Acacia crassicarpa and Casuarina equisetifolia plantations,temperature was the primary controlling factor.The type of forest,soil temperature,and water content are crucial regulators of soil N mineralization and nitrification rates.Utilizing local tree species from Secondary forests and Acacia crassicarpa in the improvement of coastal forests can enhance soil mineral N content and N conversion rates,thereby contributing to the sustainability of these ecosystems.关键词
海岸沙地/防护林/矿质氮库/氮矿化速率Key words
coastal sand dune/protection forest/mineral N storage/N mineralization rate分类
农业科技引用本文复制引用
高伟,叶功富,岳新建,刘海,陈智勇..福建海岸防护林土壤矿质氮库及氮矿化动态[J].南京师大学报（自然科学版）,2025,48(2):62-73,12.基金项目
福建省林业科学研究项目(2023FKJ31)、福建省中青年教师教育科研项目重点项目(JZ230077). （2023FKJ31）
