文献类型：期刊文献

中文题名：南亚热带不同林龄杉木人工林土壤酶活性及酶化学计量特征

英文题名：Effect of Stand Age on Soil Extracellular Enzyme Activity and Stoichiometry in Chinese Fir(Cunninghamia lanceolata)Plantations in Southern Subtropical China

作者：巢林[1,2] 欧梦菲[1] 魏昕昕[1] 李忠国[3] 孙兆林[4,5] 裴广廷[1] 毛兵[1] 张建兵[1] 黄柏华[3] 明安刚[3] 刘艳艳[1]

第一作者：巢林

机构：[1]南宁师范大学北部湾环境演变与资源利用教育部重点实验室,广西地表过程与智能模拟重点实验室,南宁530002;[2]湖南会同森林生态系统国家野外科学观测研究站,会同418307;[3]中国林业科学研究院热带林业实验中心,广西友谊关森林生态系统国家定位观测研究站,凭祥532600;[4]广西壮族自治区林业科学研究院,南宁530001;[5]广西漓江源森林生态系统国家定位观测研究站,桂林兴安漓江源森林生态系统广西野外科学观测研究站,桂林541316

年份：2025

卷号：46

期号：11

起止页码：7033-7042

中文期刊名：环境科学

外文期刊名：Environmental Science

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金项目(32201540);广西自然科学基金项目(2021GXNSFBA196021);广西林业科技推广示范项目(2024GXLK06)。

语种：中文

中文关键词：杉木;酶活性;酶化学计量;养分限制;林龄

外文关键词：Cunninghamia lanceolata;enzyme activity;extracellular enzyme stoichiometry;metabolic limitation;stand age

分类号：X171.1

摘要：为探究土壤酶活性及酶化学计量特征对林龄变化的响应,选取6个林龄(6、13、25、30、35和40 a)的杉木人工林,采用相关性、逐步回归和冗余分析等方法,研究不同林龄土壤理化性质、酶活性及其化学计量特征的变化规律,探讨土壤环境因子随林龄变化对土壤酶活性及酶化学计量特征的影响.随林分发育,杉木中龄(13a)阶段,林地土壤含水率(SWC)、碳(C)和养分含量显著降低,土壤β-葡萄糖苷酶(BG)、N-乙酰氨基葡萄糖苷酶(NAG)和酸性磷酸酶(ACP)则有所增加;冗余分析(RDA)表明土壤碳氮比(C∶N)、总氮(TN)和铵态氮(NH_(4)^(+))含量是驱动不同林龄杉木人工林土壤酶活性变化的主要环境因子.林龄对杉木人工林土壤酶化学计量碳氮比(eC∶N)、碳磷比(eC∶P)、氮磷比(eN∶P)、土壤碳质量(CQI)和微生物资源限制程度具有显著影响,磷是南亚热带不同林龄杉木人工林最为受限的营养元素.不同林龄土壤酶化学计量特征变化主要受SWC、TN、硝态氮(NO3-)和NH_(4)^(+)含量调控.林龄变化引起土壤理化性质的改变是杉木人工林土壤酶活性和酶化学计量特征变化的主要驱动力.研究结果可为南亚热带杉木人工林的经营提供参考,在中龄速生阶段适当增施氮磷肥,其他发育阶段可适当增施磷肥,有助于促进林地养分的改善与恢复,实现林分生产力的提高和人工林生态系统服务功能的提升.
The main objective of this study was to investigate the response of soil enzyme activity and enzyme stoichiometry to changes in forest stand age,in order to provide theoretical and data support for understanding the interaction process and mechanism between soil physicochemical properties,enzyme activity,and stoichiometry in southern subtropical Chinese fir plantations at different stand ages(6,13,25,30,35,and 40 years).Additionally,the effects of soil environmental factors on enzyme activities and stoichiometric characteristics were examined by using correlation,stepwise regression,and redundancy analyses.The results showed that soil water content(SWC),carbon(C),and nutrient content significantly decreased in the middle stand age(13 years).However,the activities ofβ-glucosidase(BG),N-acetylaminoglucosidase(NAG),and acid phosphatase(ACP)increased.Redundancy analysis(RDA)indicated that the soil carbon:nitrogen ratio(C∶N),total nitrogen(TN),and ammonium nitrogen(NH_(4)^(+))content were the main environmental factors driving the changes in soil enzyme activities in the plantations with stand development.Stand age had a significant influence on the soil enzyme C∶N(eC∶N),carbon∶phosphorus(eC∶P),nitrogen∶phosphorus(eN∶P),soil carbon quality(CQI),and microbial resource limitation in the plantations.Phosphorus was the most limiting nutrient element in the plantations of different stand ages in the southern subtropics.Changes in soil enzyme stoichiometric characteristics of varying stand ages were mainly regulated by SWC,TN,nitrate nitrogen(NO3-),and NH_(4)^(+)contents in different forest ages.Changes in soil physicochemical properties induced by forest stand age variations were the main driving factor for the changes in soil enzyme activities and enzyme stoichiometric characteristics in Chinese fir plantations.The results of this study provide a reference for the management of Chinese fir plantations in South China.Appropriate application of N and P fertilizers in the fast-growing stage,along with P fertilizer in other stages,could help to promote the improvement and restoration of nutrients.This contributed to enhancing forest productivity and the enhancement of ecosystem service functions.