文献类型：期刊文献

中文题名：重庆酸雨区马尾松林阔叶化改造对土壤碳氮组分特征的影响

英文题名：Effects of transformation of Masson pine forest to broad-leaf forest on characteristics of soil carbon and nitrogen fractions in acid rain region of Chongqing

作者：高澳寒[1] 陈展[2] 薛梦涵[1] 邓洁[1] 郭红妍[1] 杨得权[1] 王轶浩[1]

第一作者：高澳寒

机构：[1]重庆师范大学地理与旅游学院,山区生态系统碳循环与碳调控重庆市重点实验室,三峡库区地表生态过程重庆市野外科学观测研究站,重庆401331;[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

年份：2026

卷号：46

期号：5

起止页码：2241-2251

中文期刊名：生态学报

外文期刊名：Acta Ecologica Sinica

收录：;北大核心:【北大核心2023】；

基金：重庆市自然科学基金面上项目(CSTB2023NSCQ-MSX0741);重庆市教育委员会科学技术研究项目(KJQN202000502);重庆市技术创新与应用发展专项面上项目(CSTB2024TIAD-LDX0001);重庆师范大学基金项目(20XLB005)。

语种：中文

中文关键词：土壤碳氮组分;林分改造;土壤酸化;生态化学计量比;森林类型

外文关键词：soil carbon and nitrogen components;forest stand transformation;soil acidification;ecological stoichiometry;forest type

分类号：S714.2

摘要：土壤碳氮对维持土壤肥力和调节全球气候变化具有重要作用,为掌握酸雨区马尾松林阔叶化改造对土壤碳氮组分特征的影响及科学指导其经营管理。采用空间代替时间的方法,对重庆铁山坪酸雨区马尾松林及其改造成的香樟林、马尾松×香樟混交林土壤碳氮组分特征及其与土壤酸化关系进行研究。结果表明:(1)马尾松林阔叶化改造对土壤碳氮组分特征影响显著(P<0.05),与马尾松林相比,香樟林腐殖质层土壤有机碳(SOC)含量显著减少,淋溶层SOC、可溶性有机碳(DOC)含量却显著增加;混交林各土层土壤微生物碳(SMBC)含量显著增加,但各土层SOC及腐殖质层DOC含量均显著减少(P<0.05)。(2)香樟林各土层DON、硝态氮(NO_(3)-N)及淋溶层全氮(TN)、土壤微生物氮(SMBN)含量均显著增加,腐殖质层TN、SMBN含量却显著减少;混交林各土层TN、NO_(3)-N及淋溶层DON含量均显著增加,但各土层铵态氮(NH_(4)-N)含量显著减少(P<0.05)。(3)除淋溶层N/P外,香樟林各土层碳氮磷生态化学计量比均显著下降;混交林各土层C/N、C/P也显著下降(P<0.05)。(4)香樟林腐殖质层SMBC/SOC、SMBC/SMBN及淋溶层SMBN/TN均显著增大,混交林各土层SMBC/SOC、SMBC/SMBN也显著增大(P<0.05)。(5)土壤各碳氮组分与大多数土壤酸化指标均呈显著正相关,其中SOC、NH_(4)-N含量与土壤致酸阳离子(Fe^(3+)、Al^(3+))也呈显著正相关(P<0.05)。综合来看酸雨区马尾松林阔叶化改造通过改善土壤酸化环境进而促进了土壤碳氮组分含量的积累与转化,尤其改造成香樟林的影响更为明显,研究结果可为酸雨区马尾松林可持续经营管理提供科学依据与参考。
Soil carbon(C)and nitrogen(N)play crucial roles in maintaining soil fertility and regulating global climate change,which can facilitate understanding of the effects of broadleaf transformation in Pinus massoniana(P.massoniana)forest within acid rain regions on soil C and N fractions,and provide scientific guidance for management strategies.Soil C and N fractions,stoichiometric characteristics of C,N,and phosphorus(P),along with the availability and ratio changes of soil microbial carbon and nitrogen and their relationships with soil acidification characteristics in a P.massoniana stands,a P.massoniana forest transformed to Cinnamomum camphora(C.camphora)stands,and a Pinus massoniana and Cinnamomum camphora mixed stands(P.massoniana-C.camphora)were studied by the“spatial instead of time”method at Tieshanping Forest Farm of Chongqing.The results showed that:(1)Broadleaf transformation significantly affected characteristics of soil C and N fractions(P<0.05).Compared to P.massoniana,C.camphora exhibited significantly decreased soil organic carbon(SOC)content in the humic horizon,but significantly increased SOC and dissolved organic carbon(DOC)content in the eluvial horizon.In the P.massoniana-C.camphora,soil microbial biomass carbon(SMBC)content across all horizons significantly increased,while SOC content across all horizons and DOC content in the humic horizon significantly decreased(P<0.05).(2)C.camphora showed significantly increased dissolved organic nitrogen(DON)and nitrate nitrogen(NO_(3)-N)content across all horizons,along with increased total nitrogen(TN)and soil microbial biomass nitrogen(SMBN)content in the eluvial horizon,but TN and SMBN content significantly decreased in the humic horizon.In the P.massoniana-C.camphora mixed stands,TN and NO_(3)-N content across all horizons and DON content in the eluvial horizon significantly increased,but ammonium nitrogen(NH_(4)-N)content across all horizons significantly decreased(P<0.05).(3)Except for N/P ratio in the eluvia horizon,ecological stoichiometric ratios of C/N/P across all horizons significantly decreased in the C.camphora stands.C/N ratio and C/P ratio across all horizons also significantly decreased in the P.massoniana-C.camphora mixed stands(P<0.05).(4)SMBC/SOC and SMBC/SMBN ratio in the humus layer,as well as SMBN/TN in the eluvial layer,significantly increased in the C.camphora stands.SMBC/SOC and SMBC/SMBN ratio also significantly increased in the P.massoniana-C.camphora mixed stands(P<0.05).(5)Soil C and N fractions were significantly positively correlated with most soil acidification indicators.SOC and NH_(4)-N content were also significantly positively correlated with soil acidification cations(Fe^(3+)and Al^(3+))(P<0.05).Overall,transformation of P.Massoniana to broad-leaf forest in acid rain region facilitates the accumulation and transformation of soil C and N fractions by ameliorating soil acidification.In particular,the impact of transformation to C.camphora is more obvious.These findings can provide a scientific basis for the sustainable management of P.massoniana in acid rain region.