文献类型：期刊文献

中文题名：亚热带3种主要造林树种凋落叶分解失重的主场效应

英文题名：Home Effect of Leaf Litter Mass Loss of Three Subtropical Afforestation Tree Species

作者：周长剑[1,2] 何伟[2] 王奔[2] 俞珺慈[2] 雷蕾[1] 任世奇[3] 晏召贵[2] 王鹏程[2] 肖文发[1] 曾立雄[1]

第一作者：周长剑

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]华中农业大学园艺林学学院,湖北林业信息工程技术研究中心,武汉430070;[3]广西壮族自治区林业科学研究院,南宁530002

年份：2022

卷号：2

期号：3

起止页码：18-27

中文期刊名：陆地生态系统与保护学报

外文期刊名：Terrestrial Ecosystem and Conservation

基金：中央级公益性科研院所基本科研业务费专项资金(CAFBB2018QB004);国家自然科学基金(32071560);中央高校基本科研业务费(2662022YLYJ006)。

语种：中文

中文关键词：凋落叶分解(k值);质量损失;主场效应;微生物生物量碳

外文关键词：leaf litter mineralization(k value);mass loss;home-field advantage;microbial biomass carbon

分类号：S718.5

摘要：【目的】监测马尾松(Pinus massoniana)、杉木(Cunninghamia lanceolata)、栓皮栎(Quercus variabilis)3种亚热带主要造林树种凋落叶分解在林分互置条件下的重量损失,分析分解过程中的主场效应,为人工林可持续经营与地力提升提供理论依据。【方法】将在马尾松、杉木和栓皮栎纯林收集的3种树木当年掉落的凋落叶分别装入20 cm×20 cm的凋落叶分解袋,在2019年6月进行样地互置(即每个林分放置3个物种的凋落叶分解袋),至2020年10月监测了3种凋落叶分解过程中的重量损失和微生物生物量碳含量动态特征。【结果】1)林分环境、凋落叶组成质量和分解时间对凋落叶重量损失速率有显著影响;受凋落叶组成质量影响,杉木凋落叶的分解常数(k值)在各林分中皆为最小,而马尾松和栓皮栎凋落叶的分解常数较大;3个树种凋落叶的重量损失速率(V)多数时期在马尾松林或栓皮栎林中较大,在杉木林中较小。2)凋落叶分解的主场效应对杉木凋落叶在分解至第105 d表现为正,对马尾松凋落叶在分解至第348 d表现为负,而对栓皮栎凋落叶在整个实验期间均不显著。3)线性回归分析表明,凋落叶分解的主场效应与林地枯落物层的温度、湿度及枯落叶的微生物生物量碳含量均呈显著正相关。【结论】树种和分解时间对凋落叶分解的主场效应有显著影响,且分解过程中的环境因子及凋落叶组成质量变化可能是影响主场效应的因子。
【Objective】Leaf litter mass loss of Pinus massoniana,Cunninghamia lanceolate,and Quercus variabilis,the three main afforestation tree species in the subtropical region of China,were monitored in stands of mono-species plantations.The home effect in mass loss due to the mineralization of leaf litter were analyzed to provide a theoretical basis for the sustainable management and soil fertility improvement of plantations.【Method】The fresh leaf litter samples of P.massoniana,C.lanceolata and Q.variabilis were put in 20 cm×20 cm litterbags and placed in plantations of the three tree species in June 2019.The dynamics of leaf mass loss rates and carbon contents of microbial biomass were determined till October 2020.【Result】1)Stand environment,litter quality,and mineralization time had significant effects on mass-loss rate of litter.Due to the effect of litter quality,the litter of C.lanceolata showed the smallest mineralization constant(k value)in all stands,while the litter of P.massoniana and Q.variabilis showed a larger k value.The mass-loss rate of the leaf litter of all three species was usually larger in plantation of P.massoniana or Q.variabilis,and smaller in plantation of C.lanceolata.2)The C.lanceolata litter showed a positive home effect at the 105 day of mineralization,the P.massoniana litter showed a negative home effect at the 348 day of mineralization,while the Q.variabilis litter showed no home effect during the entire experiment period.3)Linear regression analysis showed that the home effect of leaf litter mineralization was positively correlated with temperature,humidity,and the carbon content of microbial biomass.【Conclusion】Both tree species and mineralization time had significant effect on the home effect of leaf litter mineralization.The variation in environment and leaf-litter quality during the mineralization process may be the underlining factors contributing to the home effect.