模拟淋溶条件下亚热带不同性状凋落叶DOM的溶出量特征  

Dissolved Organic Matter Content Characteristics of Foliar Litter in Subtropical Under Simulated Leaching Conditions

作　　者：张雪 王宏宇[1,2] 吴捷录 郑旭灵 吴福忠 ZHANG Xue;ANG Hongyu;WU Jielu;Zheng Xuling;WU Fuzhong(School of Geographical Sciences,School of Carbon Neutrality Future Technology,Fujian Normal University,Fuzhou 350117,China;Key Laboratory for Humid Subtropical Eco-Geographical Processes of the Ministry of Education,Fujian Normal University,Fuzhou 350117,China)

机构地区：[1]福建师范大学地理科学学院、碳中和未来技术学院,福州350117 [2]福建师范大学湿润亚热带生态-地理过程教育部重点实验室,福州350117

出　　处：《亚热带资源与环境学报》2024年第2期113-120,共8页Journal of Subtropical Resources and Environment

基　　金：国家自然科学基金项目(32171641)。

摘　　要：亚热带区域丰沛的降雨可导致森林凋落叶可溶性有机质(Dissolved Organic Matter,DOM)大量淋溶溶出,成为地表和土壤活性有机质的重要来源,但凋落叶性状可能显著影响DOM溶出特征。本研究选取具有明显性状差异的8种亚热带森林典型树种凋落叶为研究对象,采用模拟淋溶实验方法,分析淋溶后凋落叶可溶性有机质(包括碳、氮和磷元素)的溶出量与化学计量特征及其与性状的关系。结果发现,相较于其他树种,淋溶前DOM含量较高、持水能力较高的杜英凋落叶淋溶后碳、氮、磷的溶出量以及质量损失均大于其他树种。不同性状凋落叶可溶性有机碳、氮、磷的溶出率也表现出显著差异,且磷的溶出率明显高于碳和氮的溶出率。相关性分析表明,凋落叶可溶性有机碳溶出率主要受淋溶前可溶性有机碳和氮含量以及最大持水力的影响,但凋落叶的叶面积和淋溶前可溶性有机磷含量是影响可溶性有机磷溶出率的最重要因子。此外,凋落叶性状也可显著影响溶出DOM的DOC/DOP,DON/DOP和DOC/DON,改变从凋落物进入土壤的DOM质量。这些结果充分表明亚热带森林凋落叶DOM的迁移过程与凋落叶持水能力密切相关,为区域生态系统结构优化和可持续经营管理提供了科学依据。The rich rainfall in subtropical region can lead to a large amount loss of dissolved organic matte(DOM)from foliar litter during the leaching processes,which could be an important source of active organic matter in forest soil.However,the functional traits of deciduous leaves might play essential roles in regulating the dissolution characteristics of DOM,but far less information have been addressed.Therefore,foliar litter of eight typical tree species were selected with obvious functional traits in subtropical forests.This study analyzed the dissolution amount of soluble organic matter and their stoichiometric characteristics(including carbon,nitrogen and phosphorus)of litter using the controlled leaching experiment.The results showed that litter of Elaeocarpus decipiens compared with other species displayed more dissolution of carbon,nitrogen and phosphorus and the mass loss after leaching,due to the higher initial DOM content and the high water-holding capacity.Moreover,foliar litter traits exhibited significant effects on the dissolution rates of dissolved organic carbon,nitrogen and phosphorus,although the dissolution rates of phosphorus were significantly higher than that of carbon and nitrogen.Correlation analysis indicated that the dissolution rate of carbon was mainly affected by the initial dissolved organic carbon content and nitrogen and the maximum water-holding capacity,while the leaf area and the initial dissolved organic phosphorus content were the most dominant factors affecting the dissolution rates of phosphorus.In addition,foliar litter traits also significantly affected the DOC/DOP,DON/DOP and DOC/DON.These results suggest that the material migration processes of foliar litter in subtropical forests is closely related to the water-holding capacity,which can provide a scientific basis for the optimization of regional forest structure and sustainable management.

关 键 词：可溶性有机质 叶片初始性状 淋溶 持水能力 亚热带森林 

分 类 号：Q948[生物学—植物学]