The small-scale pattern of seepage water nitrate concentration in an N saturated spruce forest is regulated by net N mineralization in the organic layer
The small-scale pattern of seepage water nitrate concentration in an N saturated spruce forest is regulated by net N mineralization in the organic layer
复制标题
氮饱和云杉林渗流水硝酸盐浓度的小尺度模式受有机层中净氮矿化的调节
DOI：
10.1007/s11104-008-9643-z
复制
发表时间：
2008
期刊：
影响因子：
4.9
通讯作者：
Dannenmann
中科院分区：
文献类型：
--
作者：
Matejek;Kohlpaintner;Gasche;Dannenmann
为了解释渗透水中硝态氮（NO3−）浓度的小尺度变化，在德国巴伐利亚Höglwald森林的一个N饱和成熟云杉林的30 × 18m均匀样地研究了土壤净氮(N)矿化和硝化以及总硝化速率。在主生根区下方40cm深度处，用吸盘分两期在20个测点处取样渗水。采样点在两个采样周期内均匀分布在地块上，代表了121个吸盘紧密网内测量的渗流水NO3−浓度的整个浓度范围。在各测点分别测量了有机层土壤净氮矿化、总硝化和净硝化、异养土壤呼吸、可提取土壤铵态氮和硝态氮，以及其他土壤理化参数，并与渗流水中硝态氮浓度进行了相关性分析。此外，利用多元线性回归分析评价了环境参数对氮转化过程的影响。研究发现，渗流水中NO3−浓度的小尺度变化与有机层微生物N周转率关键过程的小尺度变化有关。在本研究中，利用多元线性逐步回归模型，有机层净氮矿化可以解释51 ~ 59%的主生根区以下渗流水中硝酸盐浓度相应的小尺度变化。此外，我们发现有机层氮周转的小尺度模式受到有机层含水量和有机质干质量的强烈影响。
Soil net nitrogen (N) mineralization and nitrification as well as gross nitrification rates were studied in a forest soil within a 30 × 18m homogeneous plot located in an N saturated mature spruce stand at the Höglwald Forest (Bavaria, Germany) in order to explain the small-scale variation in nitrate (NO3−) concentration in seepage water. Seepage water was sampled below the main rooting zone in 40cm depth with suction cups over two periods at 20 measuring spots respectively. The sampling spots were uniformly distributed over the plot for both sampling periods, and represented the whole concentration range of seepage water NO3−concentrations measured within a close mesh of 121 suction cups. At each measuring spot soil net N mineralization, gross and net nitrification, heterotrophic soil respiration, extractable soil ammonium (NH4+) and NO3−, and additional physical and chemical soil parameters were measured in the organic layer and correlated with the NO3−concentrations in seepage water. Furthermore, the effects of environmental parameters on N conversion processes were evaluated using multiple linear regression analysis. We found that the small-scaled variations in seepage water NO3−concentration were related to similar small-scaled variations in key processes of microbial N turnover rates in the organic layer. Within this study net N mineralization in the organic layer could explain 51–59% of the corresponding small-scale variation of nitrate concentrations in seepage water below the main rooting zone using a multiple linear regression model with stepwise procedure. In addition, we found that small-scale patterns of N turnover in the organic layer were strongly influenced by water content in the organic layer and the dry mass of organic matter.
登录
查看更多内容
作为检验统计量的离散度指数
DOI：
--
发表时间：
1965
期刊：
影响因子：
--
作者：
B. Selby
通讯作者：
B. Selby
影响因子：
9.4
作者：
Rennenberg, H;Kreutzer, K;Weber, P
通讯作者：
Weber, P
人工酸灌溉、施石灰和施氮肥对氮饱和挪威云杉林中针叶元素浓度、凋落物通量、体积增量和树冠透明度的响应
DOI：
--
发表时间：
2004
期刊：
影响因子：
--
作者：
C. Huber;K. Kreutzer;H. Röhle;A. Rothe
通讯作者：
A. Rothe
影响因子：
2.9
作者：
Müller, C;Abbasi, MK;Jäger, HJ
通讯作者：
Jäger, HJ
影响因子：
4
作者：
J. Stoddard
通讯作者：
J. Stoddard