文献类型：期刊文献

中文题名：近自然化改造对马尾松和杉木人工林土壤有机碳化学稳定性的影响

英文题名：Effects of Close-to-Nature Transformation on the Chemical Stability of Soil Organic Carbon in Pinus massoniana and Cunninghamia lanceolata Plantations

作者：舒韦维[1,3] 明安刚[1] 杨坤[1] 李华[1,3] 闵惠琳[1,3] 陶怡[1] 李忠国[1,3] 韦菊玲[1] 刘世荣[2]

第一作者：舒韦维

机构：[1]中国林业科学研究院热带林业实验中心,凭祥532600;[2]中国林业科学研究院森林生态环境与自然保护研究所,北京100091;[3]广西友谊关森林生态系统定位观测研究站、友谊关森林生态系统广西野外科学观测研究站,凭祥532600

年份：2025

卷号：61

期号：11

起止页码：1-13

中文期刊名：林业科学

外文期刊名：Scientia Silvae Sinicae

收录：;北大核心:【北大核心2023】；

基金：中国林业科学研究院基本科研业务费专项资金项目(CAFYBB2021ZW001–02);国家自然科学基金项目(U24A20430?02);广西林业科技推广示范项目(2024GXLK06)。

语种：中文

中文关键词：近自然化改造;有机碳化学组分;Pielou均匀度指数;化学稳定性;马尾松;杉木

外文关键词：close-to-nature transformation;SOC chemical composition;Pielou evenness index;chemical stability;Pinus massoniana;Cunninghamia lanceolata

分类号：S714.2

摘要：【目的】探究近自然化改造对南亚热带针叶人工林土壤有机碳化学组分及其分布均匀性的影响,为揭示针叶人工林近自然经营土壤有机碳化学稳定性机制提供参考依据。【方法】以经过疏伐后在林下补植乡土阔叶树(大叶栎和格木)的马尾松和杉木近自然化改造林及未改造纯林(包括马尾松改造林、杉木改造林、马尾松对照林和杉木对照林)为对象,采用13C核磁共振技术系统分析土壤、凋落物和细根的有机碳化学组分(烷基碳、氧烷基碳、芳香碳、羰基碳),并利用Pielou均匀度指数评估土壤、凋落物和细根总有机碳中各类有机碳组分分布的均匀程度。【结果】1)近自然化改造可显著改变马尾松林凋落物、细根和土壤有机碳化学组分:凋落物中,烷基碳比例提高,而氧烷基碳和芳香碳比例降低;细根中,烷基碳比例提高,芳香碳比例降低;土壤中,烷基碳比例提高,氧烷基碳比例降低(P<0.05);然而,近自然化改造对杉木人工林凋落物、细根和土壤中的各有机碳化学组分均无显著影响。2)马尾松改造林土壤、凋落物和细根的烷基碳比例/氧烷基碳比例比值以及凋落物、土壤Pielou均匀度指数均显著提高。3)近自然化改造可显著增加土壤微生物生物量碳,但并未显著影响土壤细菌Chao1多样性指数和Shannon-Wiener多样性指数。4)RDA分析表明,细根烷基碳比例和氧烷基碳比例是影响土壤有机碳化学组分最关键的2个因子,说明与凋落物相比,细根有机碳化学组分是导致纯林和改造林土壤有机碳化学组分差异的关键因素。【结论】近自然化改造对土壤有机碳化学稳定性的影响具有明显的树种特异性:马尾松林改造后土壤有机碳化学组分分布更均匀,烷基碳比例及烷基碳比例/氧烷基碳比例比值显著提升,有效增强了有机碳的化学稳定性,而杉木林改造后未产生类似效应。
【Objective】This study aims to explore the effects of close-to-nature transformation on the chemical composition and distribution evenness of soil organic carbon in subtropical coniferous plantations in south Asia,providing a reference for revealing the mechanism of soil organic carbon chemical stability under close-to-nature management in coniferous plantations.【Method】This study focused on close-to-nature transformed stands of Pinus massoniana and Cunninghamia lanceolata,which were thinned and replanted with native broadleaf species(Quercus griffithii and Erythrophleum fordii),as well as untransformed pure stands as controls.Specifically,four plantation types were included:close-to-nature transformed P.massoniana plantation,P.massoniana control plantation,close-to-nature transformed C.lanceolata plantation and C.lanceolata control plantation.The 13C nuclear magnetic resonance(NMR)spectroscopy was used to systematically analyze the chemical composition of organic carbon(alkyl C,O-alkyl C,aromatic C,carbonyl C)in soil,litter,and fine roots.The Pielou evenness index was used to assess the distribution evenness of various organic carbon components in the total organic carbon of soil,litter,and fine roots.【Result】1)The close-tonature transformation significantly altered the organic carbon chemical composition in the litter,fine roots,and soil of P.massoniana plantation:In litter,the proportions of alkyl C increased while O-alkyl C and aromatic C decreased;in fine roots,alkyl C proportion increased while aromatic C proportion decreased;in soil,alkyl C proportion increased while O-alkyl C proportion decreased.However,the transformation had no significant effect on any organic carbon chemical components in litter,fine roots,or soil of C.lanceolata plantation.2)In the transformed P.massoniana plantation,the alkyl C proportion/O-alkyl C proportion ratio(A/O-A)and the Pielou evenness index of carbon chemical composition in litter and soil significantly increased.3)The transformation significantly increased soil microbial biomass carbon(MBC),but did not significantly affect soil bacterial Chao1 diversity index and Shannon-Wiener diversity index.4)Redundancy analysis(RDA)revealed that fine root alkyl C proportion and O-alkyl C proportion were the two most critical factors influencing SOC chemical composition,indicating that,compared to litter,the chemical composition of fine root organic carbon was the key factor leading to differences in SOC chemical composition between the transformed and pure plantation.【Conclusion】The influence of close-to-nature transformation on the chemical stability of SOC displays notable species-specificity.Following transformation,the P.massoniana stand has a more uniform distribution of SOC chemical components,along with a significant increase in alkyl C proportion and the alkyl C proportion/O-alkyl C proportion ratio,effectively enhancing chemical stability of organic carbon.In contrast,no comparable effect has been observed in the transformed C.lanceolata stand.