Issues around the loss of diversity caused by fast鄄growing tree plantations such as Eucalyptus have aroused controversy for many years. It is generally believed that Eucaluptus plantations bring about a decrease of plant忆s biodiversity by influencing resource competitions, allelopathy, or the level of soil fertility. Above and below鄄ground of forest ecosystems interact implicitly. Complex interactions between above鄄belowground biodiversity may provide important feedbacks regulating ecosystem. However, seldom information was available on the soil organism忆s diversity in Eucalyptus plantations. Furthermore, most of the previous studies were being conducted in the short鄄term rotation Eucalyptus plantations with a certain plantation age, which might limit our understanding of the actual plantation ecosystem process. Therefore, the
Large areas of P. massoniana plantations are often assumed to have serious ecological problems such as reduced biodiversity and soil degradation. Logging gaps are an efficient practice used to solve these problems. We investigated how the size of forest gaps in P. massoniana plantations influenced the characteristics of different soil labile organic carbon fractions and the carbon management index. Compared with those in P. massoniana plantations, the content and proportion of microbial biomass carbon increased, while the content of water鄄soluble organic carbon and readily oxidizable carbon, and the proportion of water鄄soluble organic carbon decreased in forest gaps. The size of the forest gap had significant effects on the content and proportion of labile organic carbon fractions. With the increasing size of forest gaps, the content of water鄄 soluble organic carbon, microbial biomass carbon, and readily oxidizable carbon increased. The proportions of water鄄soluble organic carbon and microbial biomass carbon increased, the proportion of readily oxidizable carbon first decreased and then increased and the non鄄labile carbon proportion first increased and then decreased. The content and proportion of labile organic carbon and the stability of organic carbon were relatively higher in larger (900-1225 m 2) gaps. The carbon management index was not significantly affected by forest gap size, which positively correlated with the content of different soil labile organic carbon fractions and soil total organic carbon. The effects of forest gap size on soil organic carbon were http: / / www.ecologica.cn relatively significant in larger (900-1225 m 2) forest gaps in terms of a higher stability of organic carbon and a greater amount of microbial biomass carbon and water鄄soluble organic carbon. This suggests that 900-1225 m 2 gaps might provide optimal logging gap size for the conservation of ecological functions and natural regeneration in P. massoniana plantations.
Vol.37,No.2 Jan.,2017 http: / / www.ecologica.cn 基金项目:国家自然科学基金项目 (31370628) ;国家科技支撑计划项目(2011BAC09B05) ;四川省科技支撑计划项目(12ZC0017) ;四川省科技厅 应用基础项目(2012JY0047) ;四川省教育厅科技创新团队计划项目(11TD006) 收稿日期:2015• 07• 16; 网络出版日期:2016• 06• 13 * 通讯作者 Corresponding author.E•mail: sicauzhangjian@ 163.com DOI: 10.5846 / stxb201507161501 刘华,张丹桔,张健,杨万勤,李勋,张 艳,张明锦. 马尾松人工林林窗大小对四种凋落叶质量损失和养分释放的影响. 生态学报,2017,37 (2) : 513• 522. Liu H, Zhang D J, Zhang J, Yang W Q, Li X, Zhang Y, Zhang M J.Effects of forest gap size on leaf litter weight loss and nutrient release of four species in Pinus massoniana plantations.Acta Ecologica Sinica,2017,37(2) :513• 522. 马尾松人工林林窗大小对四种凋落叶质量损失和养分 释放的影响 刘 华,张丹桔,张 健 * ,杨万勤,李 勋,张 艳,张明锦 四川农业大学生态林业研究所,四川生态林业工程重点实验室, 成都 611130 摘要:马尾松人工林乔木层植物凋落物的分解对林地养分平衡和系统物质循环具有重要意义,并可能受不同大小林窗下微环境 差异的影响。 采用凋落物袋分解法,以马尾松(Pinus massoniana) 人工林人为砍伐形成的 7 个不同大小林窗(G1:100 m 2 、G2: 225 m 2 、G3:400 m 2 、G4:625 m 2 、G5:900 m 2 、G6:1225m 2 、G7:1600 m 2) 为研究对象,林下 (G0) 为对照,研究林窗大小对红椿 (Toona ciliata) 、桢楠(Phoebe zhennan) 、香樟(Cinnamomum camphora) 和马尾松 4 种乡土树种凋落叶质量损失及养分释放的影 响。 结果显示:1
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