Reforestation of Pinus massoniana alters soil organic carbon and nitrogen dynamics in eroded soil in south China
Reforestation of Pinus massoniana alters soil organic carbon and nitrogen dynamics in eroded soil in south China
复制标题
马尾松重新造林改变了中国南方侵蚀土壤的有机碳和氮动态
DOI：
10.1016/j.ecoleng.2012.12.099
复制
发表时间：
2013-03-01
影响因子：
3.8
通讯作者：
Cheng, Xiaoli
中科院分区：
文献类型：
--
作者：
Dou, Xiaolin;Deng, Qi;Cheng, Xiaoli
近几十年来，为了恢复和保护华南地区被侵蚀的红土，广泛开展了马尾松再造林活动。马尾松的重新造林可能会改变土壤碳（C）和氮（N）动态，并对生物地球化学循环和旨在恢复被侵蚀的红壤生态系统的管理策略的生态响应产生影响。本研究通过土壤分异和稳定碳氮同位素研究了华南长汀县未耕地转马尾松林造林10年、18年、25年和30年的土壤有机碳（SOC）和氮动态。将来自未开垦地区和马尾松重新造林地区的土壤样品分为有机土壤和顽固土部分，并对两个部分的 C 和 N 浓度、δ C-13 和 δ N-15 值进行分析。我们发现马尾松重新造林18-30年后显着提高了土壤C和N水平，而10年后重新造林并没有显着提高土壤C和N水平。重新造林后的碳积累似乎是由大量生物量输入和低碳分解共同决定的。 δ C-13 值的变化表明，10 年土壤中老 C 的衰减速率比 18-30 年土壤中的要快。有机土壤的 Delta N-15 值随着种植园年龄的增加而减少，表明氮损失随着林龄的增加而减少。我们的结果表明，马尾松的重新造林可能会改变土壤碳输入和分解速率，从而对生态系统功能产生潜在影响。 (C) 2013 Elsevier B.V. 保留所有权利。
Reforestation of Pinus massoniana has been widely conducted to restore and protect the eroded red soil in south China in recent decades. The reforestation of P. massoniana may alter soil carbon (C) and nitrogen (N) dynamics and has implications for both biogeochemical cycling and ecological responses to management strategies aiming at restoring eroded red soil ecosystems. In this study, we investigated soil organic C (SOC) and N dynamics following uncultivated area converted to P. massoniana forest of 10, 18, 25, and 30 years old of reforestation in Changting Country of south China by soil fractionation and stable C and N isotopes. Soil samples from the uncultivated area and P. massoniana reforestation area were separated into organic soil and recalcitrant fractions, and two fractions were analyzed for their C and N concentrations, delta C-13 and delta N-15 values. We found that reforestation of P. massoniana after 18-30 years significantly increased soil C and N levels, whereas reforestation after 10 years did not significantly enhance soil C and N levels. The C accumulation following the reforestation appeared to be determined by a combination of large biomass input and low C decomposition. The change in the delta C-13 values indicated that the decay rates for old C in the 10 years old soil was faster than that at the 18-30 years old stand. The delta N-15 values of organic soil were more depleted with plantation age, indicating a decreased N loss with stand age. Our results suggest that reforestation of P. massoniana could alter soil C input and decomposition rate and thus, have potential effects on ecosystem function. (C) 2013 Elsevier B.V. All rights reserved.