摘要
采用配对样地法,以不同栽植代数(第1代和第2代)、不同发育阶段(8,15,18,20年生)的马尾松Pinus massoniana人工林为对象,对第1代和第2代不同林龄马尾松人工林土壤微生物及生化作用进行比较分析。结果表明:连栽后,无论是幼龄林还是中龄林,相同层次土壤中细菌、放线菌、真菌及微生物总数第2代均高于第1代,且幼龄林0～20 cm土壤细菌、真菌及2个层次土壤微生物总数、中龄林0～20 cm土壤真菌、20～40 cm土壤细菌、真菌及微生物总数在第1代和第2代间的差异达显著(P<0.05)或极显著(P<0.01)水平;在第1代和第2代幼龄林、中龄林土壤微生物区系组成中,细菌占微生物总数百分比最高,其次是放线菌,真菌最少。对土壤生化作用的影响,连栽后,幼龄林、中龄林不同层次土壤硝化作用强度第2代较第1代有所上升,而氨化作用强度则趋于下降,且中龄林0～20 cm和20～40 cm土壤硝化作用强度在第1代和第2代间的差异达显著(P<0.05)或极显著(P<0.01)水平。马尾松连栽对其幼龄林、中龄林土壤三大类微生物数量及生化作用强度均产生不同程度的正效应。
Through the pairing method of different generations （lst and 2nd） and ages （8, 9, 15, 18, and 20 years）, a comparison of soil microorganisms and the biochemical role for the first and second state of Pinus massoniana plantations was made. Results showed that after successive rotations in young and middle-aged forests, bacteria, actinomycetes, fungi, and total microorganisms for corresponding soil layers were higher in the second generation thah the first. Significant （P 〈 0.05） and highly significant （P 〈 0.01） differences were found in the young forest for bacteria and fungi in the 0-20 cm layer, and total microorganisms in the 0-20 em and 20-40 cm layers; and in the middle-aged forest, fungi in the 0-20 cm layer and bacteria, fungi, and total microorganisms in the 20-40 cm. Soil microbes in the young and middle aged first and second gener- ation forests were in the order： bacteria 〉 actinomycetes 〉 fungi. The biochemical role for different soil lay- ers, after successive rotations, for the second generation compared to the first, showed higher soft nitrifica-tion and lower ammonification in the young and middle-aged forests; also, differences in soil nitrification in the middle-aged forest at the 0-20 cm and 20--40 cm depths was significant （P 〈 0.05） or highly significant （P 〈 0.01 ）. Thus, successive rotations had an effect on soil microorganisms and biochemical roles in the young and middle-aged P/nus massoniana forest. [Ch, 4 fig. 2 tab. 18 ref.]
出处
《浙江农林大学学报》
CAS
CSCD
北大核心
2012年第5期703-709,共7页
Journal of Zhejiang A&F University
基金
国家高技术研究发展计划("863"计划)项目(2011AA100203)
贵州省人才基地建设项目(黔人领发[2009]9号)
贵州省创新团队课题(黔科合人才团队[2011]4003)
贵州省科学技术基金资助项目(黔科合J字[2009]2084号)
关键词
森林培育学
马尾松
人工林
连栽
微生物
生化作用
silviculture
Pinus massoniana
plantation
successive rotation
microorganism
biochemical role
