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多代连栽对桉树人工林土壤有机碳含量影响的Meta分析

来源:用户上传      作者:崔俊峰 唐健 郭丽梅 王会利 石媛媛 宋贤冲

  摘 要:为了系统评价连栽对桉树人工林土壤有机碳含量的影响,检索了CNKI、万方数据库,搜集相关研究,以土壤有机碳含量的加权均数差为效应量,对纳入研究的文献进行Meta分析。结果表明:随着连栽代次的增加,桉树人工林土壤有机碳含量与对照林分的差异逐渐减小;随着土层深度的增加,桉树人工林土壤有机碳含量与对照林分的差异逐渐减小,多代连栽对桉树土壤有机碳含量的影响主要体现在表土层。今后在桉树人工林营林实践中应注重对一代、二代和三代桉树人工林的表层土壤的有机质补充,以维持桉树人工林地力和桉树产业健康可持续发展。
  关键词:B栽;桉树人工林;土壤;有机碳;Meta分析
  中图分类号:S714.8 文献标志码:A
  Continuous Cropping Effects on Soil Organic Carbon Content in Eucalyptus Plantation Based on Meta-analyisis
  CUI Junfeng1,2,3,TANG Jian1,2,GUO Limei4,WANG Huili1,2,
  SHI Yuanyuan1,2,SONG Xianchong1,2*
  ( 1 Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning,Guangxi 530002,China;2 Guangxi Research and Development Center of New Forestry Fertilizer,Nanning,Guangxi 530002,China;3 The State-owned Qinlian Forest Farm of Guangxi Zhuang Autonomous Region,Qinzhou,Guangxi 535000,China;4 Guangxi Subtropical Crops Research Institute,Nanning,Guangxi 530001,China)
  Abstract:In order to systematically evaluate the effects of continuous cropping on soil organic carbon content of Eucalyptus plantation,CNKI and WANFANG database were searched to collect the related research. A Meta-analysis on the literatures was performed by using the weighted mean difference (WMD) of soil organic carbon content as the effect size. The results showed that the differences of soil organic carbon content between eucalyptus plantation and control stands gradually decreased with the increase of successive cropping generations and the increase of soil depth,indicating that the effect of multi-generation planting on soil organic carbon content mainly embodied in topsoil. In the future eucalyptus afforestation and management,should pay attention to the supplement of organic matter in topsoil in the first,second and third generations of eucalyptus plantations,so as to maintain soil fertility and sustainable development of eucalyptus plantation.
  Key words:Continuous cropping,eucalyptus plantation,soil,organic carbon,Meta-analysis
  多代连栽是桉树人工林一种常见的经营方式,短周期多代连栽可以带来巨大的经济利益[1]。作为陆地生态系统中最大碳库的土壤,其对全球碳循环起着重要作用[2]。近年来,随着短周期多代连栽、全垦皆伐等高强度经营方式在桉树人工林的大面积应用,桉树人工林土壤质量发生明显下降,土壤碳密度和碳储量也呈下降趋势[3-5]。因此,越来越多的研究者开始关注多代连栽下桉树人工林土壤有机碳的变化。明安刚等[6]、肖斌[7]、史进纳等[8]、宋贤冲等[9]对不同连栽代次桉树人工林土壤有机质(碳)含量进行了研究;梁宏温等[10]、黄图英[11]、吕小燕等[12]研究了连栽下桉树人工林土壤有机碳储量的变化特征。由于土壤有机碳含量的影响因素较多,包括土地利用方式[13-14]、地理位置、气温和降水量等[15],而大多数研究的空间和时间尺度较小,加上土壤具有较强的异质性,导致不同连栽代次土壤有机碳的研究结果代表性较差且出现不同研究结果不一致的现象,这就造成引用或参考上述研究结果时难以辨别和取舍的问题。针对上述问题,就需要采取与传统研究综述定性比较不同的方法,对研究结果进行定性与定量结合的综合分析,得出综合性的分析结论[16]。

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