近自然化改造对马尾松人工林土壤有机碳化学组分的影响

打开文本图片集

【结论】近自然化改造增强了马尾松人工林土壤有机碳的化学抵抗性，有助于关键词：近自然化改造；土壤有机碳化学组分；南亚热带；马尾松人工林

中图分类号： S718.55+4.1 文献标志码：A 文章编号：1673-923X（2025）09-0151-08

Abstract：【Obective】Tostudythedominantfactorsofthechemicalcompositionandstabilityofsoilorganiccarboninthecloseto naturePinusmaoanaplantatiosndtopovideaientifcbasisfortesstaiableanagementandualityprovemtfins massonianaplantations，themechanismoftheimpactofnear-naturalizationonsoilorganiccarboninPinus massonianaplantations was clarified.【Method】 Solid-state 13C nuclear magnetic resonance （NMR） spectroscopy was utilized to analyze the chemical compositionofSOCinCNTofPinusmassnianaplantation（CN）andPinus massonanaplantation（CK），soilphysicalandchemical properties，soil microbial biomasscarbonandnitrogenandcommunitycomposition were measured.【Result】Theresultsshowed that：l）clostaturetafoatisigantlyeasdslilableospousdtotalosposutdnoo soilphysicocecalpropets;2）loetaturetasoationsigantlyducedsoilobialoassbondCbut significantlyicreasedungalaondex，adnotsoilmcoialiosstroenadericobiallpditde; 3） Inboth CNTand CK，the O-alkyl C accounts for the largest proportion 46%-49% ，while thecarbonyl Caccounts for the smallest proportion （9%-12%） .Close-to-nature transformationsignificantlyreducedthesoilalkylC，alkylC/O-alkylC，butsignificantlyincreased thearomticC/alkylC，CNThadnoeectonotherchemicalcompositionsofsoilorganiccarbon;4）Totalphosphorus，micobial biomassC/Nandfungal Shannonindexarethemainfactors influencingchemicalcompositionsofSOC.【Conclusion】Close-toature transformationenhanedSOCchemicalresistanceandtabilitywhichelpstoehancetestabilityoftesoilorganiccabopool.

ywords：close-to-nature transformation;chemicalcompositionsofSOC;south subtropicalzone;Pinus massonianaplantation

全球森林土壤碳储量约为 6620Pg ，占全球土壤碳储量的 39%[1] ，在提升森林碳汇功能、减缓全球气候变化和调控陆地生态系统碳循环方面具有重要作用。（剩余16193字）