| 摘要: |
| 【目的】探讨亚热带红壤丘陵区5种不同人工林对土壤性质的影响。【方法】以亚热带红壤丘陵区的纯杉木林(Cunninghamia lanceolata，CL)、杉木马尾松混交林(Cunninghamia lanceolata Pinus massoniana，CLPM)、杉木樟树混交林(Cunninghamia lanceolata Cinnamomum camphora，CLCC)、天然次生林(Natural secondary forest，NF)与纯马尾松林(Pinus massoniana，PM)作为研究对象，通过调查取样与实验分析相结合的方法，分析5种人工林地中不同土层(0～20、20～40和40～60 cm)土壤的理化性质、酶活性与微生物学性质的变化。【结果】(1)有机碳(SOC)、全氮(TN)、全磷(TP)、全钾(TK)、速效钾(AK)、碱解氮(AN)含量在NF土壤中最高，CLCC土壤次之，CLPM、CL和PM土壤较低；0～20 cm土层SOC、TN、AN、TP、TK和AK含量显著高于20～40和40～60 cm土层，20～40和40～60 cm土层间的土壤养分含量差异不显著；(2)脲酶(URE)、蔗糖酶(INV)和多酚氧化酶(PPO)活性以NF土壤最高，CLPM和CLCC土壤次之，CL和PM土壤最低；0～20 cm土层URE、INV和PPO活性显著高于20～40和40～60 cm土层，20～40和40～60 cm土层间土壤酶活性差异不显著；（3）NF和CLCC土壤的微生物量碳(MBC)、微生物量氮(MBN)、土壤基础呼吸(SBR)、土壤有机碳(SOC)含量和土壤微生物对基质的利用效率高于其他树种的林下土壤。【结论】CLCC较CL、PM和CLPM可明显改善土壤性质，是该地区理想的造林模式。 |
| 关键词: 亚热带红壤丘陵区 人工林 土壤理化性质 土壤酶活性 基础呼吸 微生物生物量 |
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| 基金项目:国家林业局“948”重点项目(2008-4-32)；湖南省重点课题项目(62020608001)；湖南省教育厅科学研究项目(13C247) |
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| Effects of five plantations on soil properties in subtropical red soil hilly region |
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| Abstract: |
| 【Objective】The purpose of this stud was to study effects of 5 plantations on soil properties in subtropical red soil hilly region.【Method】Taking five plantations lands(Cunninghamia lanceolata(CL),C.lanceolata Pinus massoniana (CLPM),C.lanceolata C.camphora(CLCC),natural secondary forest(NF)and P.massoniana(PM))in subtropical red soil hilly region as test objects,soil samples from depths of 0-20,20-40 and 40-60 cm were collected to study the effects of plantations on soil physio-chemical properties,enzyme activities and microbial properties through the combination of sample investigation and experimental analysis.【Results】 (1) Contents of soil organic C(SOC),total N(TN),available N(AN),total P(TP),total K (TK) and available K (AK) in soil of NF were the highest,followed by CLCC,while those of CLPM,CL and PM were very low.Contents of SOC,TN,AN,TP,TK and AK at soil layer of 0-20 cm were higher than those at the soil layers of 20-40 and 40-60 cm(P＜0.05).(2) Urease(URE),invertase(INV)and polyphenol oxidase(PPO)activities of NF were the highest followed CLPM and CLCC,while those of CL and PM were the lowest.URE,INV and PPO activities at the soil layer of 0-20 cm were higher than those at the soil layer of 20-40 and 40-60 cm(P＜0.05).(3) Microbial biomass carbon(MBC),microbial biomass nitrogen(MBN),soil basal respiration(SBR),soil organic carbon(SOC),ratio of soil microbial carbon to organic carbon(MBC/SOC)and microbial efficiency in NF and CLCC were higher than other plantations.【Conclusion】CLCC significantly improved soil properties compared to CL,PM and CLPM and was ideal for this area. |
| Key words: subtropical hilly red soil region plantation soil physio-chemical properties soil enzyme activity basal respiration microbial biomass |
