Page 57 - 《广西植物》2020年第8期
P. 57

1 1 1 2                               广  西  植  物                                         40 卷
       Characteristics of soil carbon pool management index

          and carbon components of Eucalyptus plantations

                     with different ages at North Guangxi


                   1              2                  1∗                  3                      1
    TENG Qiumei ꎬ SHEN Yuyi ꎬ XU Guangping ꎬ HUANG Yuqing ꎬ ZHANG Zhongfeng ꎬ
                         1                 1                1                   1           1
         ZHANG Denan ꎬ ZHOU longwu ꎬ SUN Yingjie ꎬ HUANG Kechao ꎬ HE Wen
  ( 1. Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrainꎬ Guangxi Institute of Botanyꎬ Guangxi Zhuang Autonomous
     Region and Chinese Academy of Sciencesꎬ Guilin 541006ꎬ Guangxiꎬ Chinaꎻ 2. Guangxi Key Laboratory of Functional Phytochemicals Research and
          Utilizationꎬ Guangxi Institute of Botanyꎬ Guangxi Zhuang Autonomous Region and Chinese Academy of Sciencesꎬ Guilin 541006ꎬ
            Guangxiꎬ Chinaꎻ 3. Key Laboratory of Environment Change and Resources Use in Beibu Gulf & Guangxi Key Laboratory of
              Earth Surface Processes and Intelligent SimulationꎬGuangxi Teachers Education Universityꎬ Nanning 530001ꎬ China )

       Abstract: Using the space ̄time intergenerational methodꎬ the plantation of different ages of Eucalyptus plantations in low
       hilly areas at Northern Guangxi were taken as the research object. The effects of forest age on characteristics of soil organic
       carbon (SOC)ꎬ total nitrogen (TN)ꎬ soil labile organic carbon (LOC) and soil carbon management index (CPMI) were
       measured in this study. The results were as follows: (1) SOC indicated a trend of increasing with the increase of Eucalyptus
       forest ageꎬ and decreased with the increasing of soil depth. The content of soil organic carbon of 1-8 years old Eucalyptus
                               ̄1
       varied from 5.79 to 15.57 gkg in the whole soil layer (0-40 cm) ꎬ the order of SOC contents was 8 a>5 a>3 a>4 a>2 a>
       1 a. (2) The variation tendencies of soil not labile organic carbon and carbon storage were consistent with the content of
       SOC. The order of soil labile organic matter contents was 8 a>5 a>4 a>3 a>2 a>1 aꎬ respectively. There were no obvious
       change characteristics for the proportion of soil labile organic carbon to soil organic carbon with the increase of forest
       age. There was significant difference between 8 year old forest age and other forest ages. (3) The carbon pool management
       index increased with the increase of forest age. The soil carbon pool management index and soil carbon component contents
       of 8 ywars old Eucalyptus had been higher compared with 10 years old Pinus massoniana forest. Moreoverꎬ correlation analy ̄
       sis showed that existing extremely significant or significant correlation to soil organic carbonꎬ soil not labile organic carbonꎬ
       labile oragnic carbonꎬ carbon storageꎬ carbon pool activityꎬ total nitrogenꎬ bulk density and soil carbon pool management
       index. There were also differences of carbon pool management index between different forest ages and soil layers. It was con ̄
       cluded that under the condition of local soil fertilityꎬ 8 years old Eucalyptus could both increase SOC contents and improve
       CPMIꎬ favor soil quality amelioration and soil fertility improvement. Thereforeꎬ extending Eucalyptus plantations forest har ̄
       vesting time and decreasing the disturbance to forest litter and understory vegetation would improve soil qualityꎬ and it is al ̄
       so important for promoting sustainable development of Eucalyptus plantations.
       Key words: Eucalyptus plantationsꎬ forest ageꎬ soil organic carbonꎬ soil labile organic carbon poolꎬ carbon pool manage ̄
       ment index

       森林土壤有机碳库是全球土壤碳库的重要组                           映土地经营管理水平ꎬ并可以用土壤碳库管理指

   成 部 分ꎬ 主 要 存 在 于 枯 枝 落 叶 和 土 壤 表 层                数(carbon pool management indexꎬCPMI) 进行量化
   (Pregitzer & Euskirchenꎬ2010)ꎬ其含量的变化对全            (Lefroy et al.ꎬ 1993)ꎮ 碳库管理指数是指示土壤
   球碳循环和二氧化碳通量的改变起到关键的作用                             经营和管理所采取方法是否科学的指标ꎬ既能反
   (张鹏等ꎬ2009)ꎮ 土壤有机碳作为土壤碳库的重                         映外界管理措施对土壤总有机碳的影响ꎬ还能反
   要组成部分ꎬ不仅能直接反映土壤的肥力水平ꎬ衡                            映土壤有机碳组分的变化情况ꎬCPMI 值变大说明
   量土壤质量(周国模和姜培坤ꎬ2004)ꎬ还能有效反                         土地经营措施可以维持和提高土壤质量ꎬ其值变
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