The long-term effects of reforestation on soil microbial biomass carbon in sub-tropic severe red soil degradation areas
The long-term effects of reforestation on soil microbial biomass carbon in sub-tropic severe red soil degradation areas
复制标题
亚热带红壤严重退化区植树造林对土壤微生物生物量碳的长期影响
DOI：
10.1016/j.foreco.2012.08.019
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发表时间：
2012-12-01
影响因子：
3.7
通讯作者：
Jiang, Yumei
中科院分区：
文献类型：
--
作者：
Liu, Yuanqiu;Wei, Xiaohua;Jiang, Yumei
在气候变化研究中，土壤微生物生物量碳（MBC）和土壤微生物熵（MBC/TOC：MBC与总有机碳的比率）常被用作评估土壤质量、地下过程及其对二氧化碳浓度升高的响应的指标。本研究利用这两个指标，调查了中国亚热带地区一个严重退化的红壤区域在1991年造林后三种不同造林类型（针叶林、阔叶林以及针叶林和阔叶林混交林）对土壤恢复的影响。我们的研究结果表明，在20年的土壤恢复后，不同造林类型对0 - 20厘米土壤深度的MBC浓度有显著影响（p < 0.05）。与自然生长草本植物的对照地（62.0毫克/千克）相比，阔叶林的MBC提升最多（148.5毫克/千克），其次是针叶林 - 阔叶林混交林（127.7毫克/千克）和针叶林造林地（100.4毫克/千克）。这一结果表明了在恢复严重退化的生态系统中选择造林类型的重要性。尽管经过20年的恢复MBC有所增加，但MBC仍处于较低水平，这表明当土壤严重退化时，恢复是一个长期且缓慢的过程。然而，三种造林类型之间的土壤微生物熵没有显著差异，这表明土壤微生物熵并不像之前认为的那样是严重退化地区造林类型的敏感指标。我们在森林碳、气候变化和恢复的背景下对研究结果进行了讨论。（C）2012爱思唯尔B.V.版权所有。
Soil microbial biomass carbon (MBC) and soil microbial entropy (MBC/TOC: ratio of MBC to total organic carbon) are frequently used as indicators to assess soil quality, belowground processes and their responses to elevated CO2 in climate change studies. Using these two indicators, this study investigated the effect of three different reforestation types (coniferous, broadleaved, and mixture of conifer and broadleaved) on soil recovery following the plantations in 1991 in a severely degraded red soil area of the sub-tropic regions of China. Our results indicate that different reforestation types had significant effect on the MBC concentration in the 0-20 cm of soil depth after the 20-year soil recovery (p < 0.05). The MBC improved the most in the broadleaved forest (148.5 mg kg(-1)), followed by the mixture of conifer-broadleaved (127.7 mg kg(-1)) and the coniferous plantation (100.4 mg kg(-1)), as compared to the control (62.0 mg kg(-1)) where the sites are naturally covered with grasses. This result suggests that the importance of selecting reforestation types in restoring the severely-degraded ecosystems. In spite of the MBC increase following the 20-year rehabilitation, MBC remains at low levels, suggesting that restoration is a long-term, slow recovery process when soils are severely degraded. However, there were no significant differences in soil microbial entropy among three reforestation types, indicating that soil microbial entropy is not a sensitive indicator to reforestation types in severely-degraded areas as previously thought. We discussed our results in the context of forest carbon, climate change and restoration. (C) 2012 Elsevier B.V. All rights reserved.