Nitrogen Mineralization in Soils Along a Vegetation Chronosequence in Hong Kong

L.M.MARAFA; K.C.CHAU

首页> 外文期刊>土壤圈（英文版） >Nitrogen Mineralization in Soils Along a Vegetation Chronosequence in Hong Kong

【24h】

Nitrogen Mineralization in Soils Along a Vegetation Chronosequence in Hong Kong

机译：香港植被沿时序的土壤氮素矿化

获取原文

获取原文并翻译 | 示例

掌桥外文数据库（机构版） >>

开具论文收录证明 >>

页面导航

摘要
著录项
相关主题

摘要

This research examined nitrogen mineralization in the top 10 cm of soils along a vegetation gradient in Hong Kong at sites where fire has been absent for 0, 1, 3, 6 and 17 years (at the time of the study), and the relationships between N mineralization and successional development of vegetation in the absence of fire. The sites including a newly burnt area (S1), short grassland (S2), tall grassland (S3), mixed tall grassland and shrubland (S4), and woodland (S5) were selected,and the in situ core incubation method was used to estimate nitrogen mineralization. Throughout the 60-day incubation in four periods, more nitrogen was mineralized at the S3 and S4 sites, the predominantly grassland sites, which contained the highest levels of soil organic matter (SOM) and total Kjeldahl nitrogen (TKN), than the S1 site, while immobilization occurred at the S2 and S5 sites. Leaching loss decreased with successional development of the vegetation, in the order of S1 ＞ S2 ＞ S3 ＞ S4 ＞ S5. The pattern of nitrogen uptake with ecological succession was less conspicuous, being complicated by the immediate effect of fire and possibly the ability of the woodland species to extract nitrogen from the deeper ground.In the absence of fire for 3 to 6 years, the build-up of SOM and TKN was accompanied by active mineralization, thus paving the way for the invasion of shrub and tree species. A close relationship existed between nitrogen mineralization and ecological succession with this vegetation gradient. Inherent mechanisms to preserve nitrogen in a fire-prone environment including immobilization and uptake and the practical relevance of nitrogen mineralization to reforestation are discussed.

机译：这项研究调查了在香港有0、1、3、6和17年无火的地点（在研究时）沿植被梯度的前10厘米土壤中氮的矿化作用，以及两者之间的关系。在没有火的情况下氮的矿化和植被的连续发展。选择新烧区（S1），短草（S2），高草（S3），高草和灌木混交（S4），林地（S5）等地点，并采用原位核心培养方法估计氮矿化。在四个阶段的60天孵化过程中，S3和S4站点（主要是草原站点）的矿化氮含量高于S1站点，其中土壤站点的土壤有机质（SOM）和凯氏氮总量（TKN）最高，而固定发生在S2和S5站点。淋溶损失随着植被的逐步发展而减少，依次为S1＞ S2＞ S3＞ S4＞ S5。具有生态演替的氮吸收模式不那么明显，其原因是火灾立即起火，可能还有林地物种从深部土壤中提取氮的能力所致。在没有火灾3至6年的情况下， SOM和TKN的上升伴随着活跃的矿化作用，从而为灌木和树木的入侵铺平了道路。植被梯度与氮素矿化与生态演替关系密切。讨论了在易火环境中保存氮的内在机制，包括固定化和吸收，以及氮矿化与重新造林的实际相关性。

著录项

来源
《土壤圈（英文版）》 |2005年第2期|181-188|共8页
作者
L.M.MARAFA; K.C.CHAU;
展开▼
作者单位

Centre for Environmental Policy and Resource Management, Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong (China);

Centre for Environmental Policy and Resource Management, Department of Geography and Resource Management, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong (China);

展开▼
收录信息中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
原文格式 PDF
正文语种 chi
中图分类
关键词
fire impact; immobilization; nitrogen mineralization; successional development; vegetation chronosequence;

机译：火灾影响;固定化;氮矿化;成功发展;植被时间序列;

Nitrogen Mineralization in Soils Along a Vegetation Chronosequence in Hong Kong

摘要

著录项

相关主题

期刊订阅