Temporal patterns of net soil N mineralization and nitrification through secondary succession in the subtropical forests of eastern China
Temporal patterns of net soil N mineralization and nitrification through secondary succession in the subtropical forests of eastern China
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中国东部亚热带森林次生演替过程中土壤净氮矿化和硝化的时间格局
DOI：
10.1007/s11104-008-9883-y
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发表时间：
2009-01
期刊：
影响因子：
4.9
通讯作者：
Zhong, Qiang
中科院分区：
文献类型：
--
作者：
Wang, Xi-Hua;Guo, Ming;Li, Yong-Fu;Zhou, Wu;Yan, En-Rong;Zhong, Qiang
将土壤氮素转化的时间趋势与植物的转移模式联系起来，从而使枯枝落叶质量在演替过程中发生变化，对于了解生态系统功能的发展模式具有重要意义。然而，亚热带地区土壤氮素矿化和硝化作用与物种转移的演替方向研究较少。通过一个演替序列，量化了中国东部亚热带森林土壤净N矿化和硝化速率、凋落物、林下凋落物、细根和土壤性质的演替模式。N净矿化速率依次为：顶端常绿阔叶林(CE：1.6 ± 0.2m g-N kg−1yr−1)和次生灌木(SS：1.4 ± 0.2m g-N kg−1a−1)；针叶林和常绿阔叶林最低(MF：1.1 ± 0.1m g-N kg−1yr−1)，其次为针叶林(Cf：1.2 ± 0.1m g-N kg−1yr−1)和亚高峰林(SE：1.2 ± 0.2m g-N kg−1yr−1)。土壤硝化作用随时间的延长而增加(SS、CF、MF、SE和CE中的土壤硝化作用分别为0.02 ± 0.1、0.2 ± 0.1、0.5 ± 0.1、0.2 ± 0.1和0.6 ± 0.1 mg-N kg−1yr−1)。通过演替，枯枝落叶−年生产量有所增加。细根密度、全N浓度、土壤全N、全碳(C)和微生物量C也依次呈“U-−”型变化趋势。土壤容重以MF最高，CE最低，SS、CF和SE居中。土壤pH值以CE最低。土壤氮素矿化和硝化作用的时间格局与针叶树(即马尾松)的生长以及与之相关的凋落物、森林地上部分、细根和土壤性质的演替变化显著相关。由于凋落物质量较低，马尾松在演替路径上的位置对土壤氮素转化的时间趋势起着重要的控制作用。
Linking temporal trends of soil nitrogen (N) transformation with shifting patterns of plants and consequently changes of litter quality during succession is important for understanding developmental patterns of ecosystem function. However, the successional direction of soil N mineralization and nitrification in relation to species shifts in the subtropical regions remains little studied. In this study, successional patterns of net soil N mineralization and nitrification rates, litter-fall, forest floor litter, fine root and soil properties were quantified through a successional sequence in the subtropical forests of eastern China. Net N mineralization rate was ‘U-shaped’ through succession: highest in climax evergreen broad-leaved forest (CE: 1.6 ± 0.2 mg-N kg−1yr−1) and secondary shrubs (SS: 1.4 ± 0.2 mg-N kg−1yr−1), lowest in conifer and evergreen broad-leaved mixed forest (MF: 1.1 ± 0.1 mg-N kg−1yr−1) and intermediate in conifer forest (CF: 1.2 ± 0.1 mg-N kg−1yr−1) and sub-climax forest (SE: 1.2 ± 0.2 mg-N kg−1yr−1). Soil nitrification increased with time (0.02 ± 0.1, 0.2 ± 0.1, 0.5 ± 0.1, 0.2 ± 0.1, and 0.6 ± 0.1 mg-N kg−1yr−1in SS, CF, MF, SE and CE, respectively). Annual production of litter−fall increased through succession. Fine root stocks and total N concentration, soil total N, total carbon (C) and microbial biomass C also followed ‘U−shaped’ temporal trends in succession. Soil bulk density was highest in MF, lowest in CE, and intermediate in SS, CF and SE. Soil pH was significantly lowest in CE. Temporal patterns of soil N mineralization and nitrification were significant related to the growth of conifers (i.e.Pinus massoniana) and associated successional changes of litter-fall, forest floor, fine roots and soil properties. We concluded that, due to lower litter quality, the position ofPinus massonianaalong the succession pathway played an important role in controlling temporal trends of soil N transformation.
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