Nitrogen cycling in forest soils across climate gradients in Eastern China
Nitrogen cycling in forest soils across climate gradients in Eastern China
复制标题
中国东部不同气候梯度森林土壤的氮循环
DOI：
10.1007/s11104-010-0706-6
复制
发表时间：
2011-01
期刊：
影响因子：
4.9
通讯作者：
Mueller, Christoph
中科院分区：
文献类型：
--
作者：
Zhang, Jinbo;Zhang, Jinbo;Zhu, Tongbin;Zhu, Tongbin;Cai, Zucong;Cai, Zucong;Mueller, Christoph;Mueller, Christoph
采用15 N示踪方法，研究了中国东部温带至热带13个森林生态系统（5个针叶林、6个落叶阔叶林、1个温带混交林和1个万年青阔叶林生态系统）土壤总氮（N）的潜在动态，并分析了影响这些森林生态系统N循环的主要因素。土壤pH值范围为4.3至7.9，土壤有机碳（SOC）范围为6.6 g kg− 1至83.0 g kg−1。通过15 N示踪研究定量了潜在的总氮转化率，其中铵态氮或硝态氮库在平行处理中被15 N标记。在所研究的森林土壤中，总矿化速率范围为0.915 μg N g− 1土壤天− 1至2.718 μg N g− 1土壤天− 1。活性有机氮（MNlab）对总矿化量（MNrec+MNlab）的平均贡献率为86%（58%~ 99%），表明活性有机氮的周转在所研究的森林生态系统中起主导作用。针叶林土壤的总矿化率（介于0.915和1.228 μg N g− 1土壤日-1之间）显著低于阔叶林土壤（介于1.621和2.718 μg N g− 1土壤日-1之间）（p< 0.01）。因此，优势植被对土壤氮素矿化具有重要的调节作用。硝酸盐的产生（硝化作用）通过两条途径进行，NH 4+和有机氮的氧化森林土壤。与土壤pH值的相关性表明，土壤pH值是控制这些森林生态系统中NH 4+和有机N氧化的关键因子。随着pH的降低，NH 4+的氧化减少，而有机氮的氧化增加。不同地点的气候条件（例如湿度状况）决定了NO3−-N的消耗过程（异化NO3−还原为NH 4+（DNRA）或NO3−的固定化）。总NO3-消耗量和总NO3-消耗量占总NO3-产生量的比例随着生态系统干旱指数的增加而下降，表明气候条件（如干旱指数），氮矿化和DNRA速率之间存在强烈的相互作用。植被和气候条件之间的相互作用决定了这些森林土壤中氮的内部循环。
A15N tracing study was carried out to investigate the potential gross nitrogen (N) dynamics in thirteen forest soils in Eastern China ranging from temperate to tropical zones (five coniferous forests, six deciduous broad-leaf forests, one temperate mixed forest, one evergreen broad-leaf forests ecosystems), and to identify the major controlling factors on N cycling in these forest ecosystems. The soil pH ranged from 4.3 to 7.9 and soil organic carbon (SOC) ranged from 6.6 g kg−1to 83.0 g kg−1. The potential gross N transformation rates were quantified by15N tracing studies where either the ammonium or nitrate pools were15N labeled in parallel treatments. Gross mineralization rates ranged from 0.915 μg N g−1soil day−1to 2.718 μg N g−1soil day−1in the studied forest soils. The average contribution of labile organic-N (MNlab) to total gross mineralization (MNrec+MNlab) was 86% (58% to 99%), indicating that turnover of labile organic N plays a dominant role in the studied forest ecosystems. The gross mineralization rates in coniferous forest soils were significantly lower (ranging between 0.915 and 1.228 μg N g−1soil day−1) compared to broad-leaf forest soils (ranging from 1.621 to 2.718 μg N g−1soil day−1) (p< 0.01). Thus, the dominant vegetation may play an important role in regulating soil N mineralization. Nitrate production (nitrification) occurred via two pathways, oxidation of NH4+and organic N the forest soils. Correlations with soil pH indicated that this is a key factor controlling the oxidation of NH4+and organic N in theses forest ecosystems. NH4+oxidation decreased with a decline in pH while organic N oxidation increased. The climatic conditions (e.g. moisture status) at the various sites governed the NO3−-N consumption processes (dissimilatory NO3−reduction to NH4+(DNRA) or immobilization of NO3−). Total NO3−consumption and the proportion of total NO3−consumption to total NO3−production decreased with an increase in the drought index of ecosystems, showing that strong interactions appear to exist between climatic condition (e.g. the drought index), N mineralization and the rate of DNRA. Interactions between vegetation, climatic conditions govern internal N cycling in these forests soils.
登录
查看更多内容
影响因子：
4.8
作者：
S. Perakis;J. Compton;L. Hedin
通讯作者：
S. Perakis;J. Compton;L. Hedin
影响因子：
64.8
作者：
J. Stark;S. Hart
通讯作者：
J. Stark;S. Hart
DOI：
10.1146/annurev.es.17.110186.001033
发表时间：
1986
期刊：
Annual Review of Ecology, Evolution, and Systematics
影响因子：
--
作者：
P. Vitousek;R. Sanford
通讯作者：
P. Vitousek;R. Sanford
影响因子：
9.7
作者：
J. Arnold;M. Corre;E. Veldkamp
通讯作者：
J. Arnold;M. Corre;E. Veldkamp
影响因子：
4.9
作者：
K. Killham
通讯作者：
K. Killham