摘要
凋落物水溶性组分流失是森林凋落物降解最为前端的过程,水溶性组分的动态变化可以在一定程度上指示森林物质循环过程,其研究对于认识天然林转变为次生林和人工林后结构和功能的改变以及不同经营模式的森林管理具有一定的科学意义.以中亚热带典型米槠(Castanopsis carlesii)人工林、米槠次生林和米槠天然林为研究对象,分析凋落叶水溶性组分以及氮磷养分含量特征.结果显示:天然林凋落叶水溶性有机碳含量及其占总有机碳的比例显著高于人工林和次生林(P<0.05),而10、11月和6月人工林凋落叶水溶性氮含量及其占总氮的比例显著高于天然林和次生林(P<0.05),3-8月人工林凋落叶的水溶性碳氮比和水溶性碳磷比则低于天然林和次生林.12月至次年8月,人工林的总碳、总氮和总磷含量显著高于天然林和次生林,并且这一时期凋落叶的总碳氮比、总碳磷比和总氮磷比表现为次生林>天然林>人工林.此外,米槠凋落叶水溶性有机碳和水溶性氮含量在10-11月出现峰值,7-8月相对较低,并与降雨量和气温呈显著负相关关系.总的来说,天然林凋落叶较高的水溶性有机碳含量有利于凋落叶早期降解和以其为载体的物质循环,而人工林凋落叶较高的水溶性养分含量可能导致较为快速的养分循环,有利于人工林的快速生长.(图7表3参32)
The loss of water-soluble components of litter is the early process of forest litter decomposition.Therefore,changes in water-soluble components could be one sensitive indicator for forest material cycling and provide scientific evidence for understanding the ecological structure and function of natural forests transformed into secondary forests and plantations.Monthly dynamics of water-soluble components(including soluble nitrogen and phosphorus)and their relationships with the total nitrogen and phosphorus content of foliar litter were investigated in Castanopsis carlesii plantation,C.carlesii secondary forest,and C.carlesii natural forest.The content of water-soluble organic carbon and its proportion to total organic carbon of foliar litter in natural forest were significantly higher than those of plantation and secondary forest(P<0.05).However,water-soluble nitrogen and its proportion to the total nitrogen of foliar litter in the plantation were significantly higher than those of natural and secondary forests in October,November,and June(P<0.05).Foliar litter in the plantation showed lower water soluble carbon-nitrogen and carbon-phosphorus ratios than those in the natural and secondary forests from March to August.From December to August,the contents of total carbon,nitrogen,and phosphorus of foliar litter in the plantation were significantly higher than those in the natural and secondary forests(P<0.05).The ratios of carbon to nitrogen,carbon to phosphorus,and nitrogen to phosphorus during this period were as follows:secondary forest>natural forest>plantation.The content of water-soluble organic carbon and nitrogen in Castanopsis carlesii foliar litter showed peak values in October and November,but relatively lower values in July and August,showing a negative correlation with temperature and rainfall in all three forests.In summary,foliar litter in the natural forest showed higher contents of water-soluble organic carbon,which is beneficial to early litter decomposition and material cycling.High content of water-soluble nitrogen and phosphorus of the foliar litter was detected in the plantation,implying rapid nutrient cycling that favors rapid growth.
作者
吴若冰
朱玲
魏文涛
郭鸿蓉
卫芯宇
倪祥银
吴福忠
WU Ruobing;ZHU Ling;WEI Wentao;GUO Hongrong;WEI Xinyu;NI Xiangyin;WU Fuzhong(Key Laboratory of Humid Subtropical Ecology-Geographic Processes of Ministry of Education,Fujian Normal University,Fuzhou 350007,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2023年第1期131-137,共7页
Chinese Journal of Applied and Environmental Biology
基金
国家自然科学基金项目(32022056&32171641)资助
关键词
亚热带
森林转换
水溶性组分
物质循环
subtropical
forest conversion
water-soluble component
material circulation
