"Fertile island" effects of Tamarix chinensis Lour. on soil N and P stoichiometry in the coastal wetland of Laizhou Bay, China
"Fertile island" effects of Tamarix chinensis Lour. on soil N and P stoichiometry in the coastal wetland of Laizhou Bay, China
复制标题
柽柳的“肥沃岛”效应。
DOI：
10.1007/s11368-015-1296-y
复制
发表时间：
2016
影响因子：
3.6
通讯作者：
Xia Jiangbao
中科院分区：
文献类型：
--
作者：
Rong Qiangqiang;Liu Jingtao;Cai Yanpeng;Lu Zhaohua;Zhao Zhenzhen;Yue Wencong;Xia Jiangbao
目的氮磷化学计量比作为反映土壤养分循环的综合指标，受多种外界环境和生物因素的影响。对这些影响的研究有限，影响机制尚不清楚。本研究旨在研究土壤N、P的化学计量变化，分析柽柳的“肥岛”效应。（T.材料与方法采用土壤采样法，对莱州湾滨海湿地的中华绒螯蟹群落进行了研究。chinensis分别于2012年7月采集。结果与讨论总的来说，群落下土壤N、P的化学计量学垂直变异较大，群落内土壤N、P的化学计量学垂直变异较大，群落内土壤N、P的化学计量学垂直变异较大，群落内土壤N、P的化学计量学垂直变异较大。中国。土壤N、P含量随土层深度的增加呈下降趋势。N/P比值则随土层深度的增加呈现出先上升后沿着下降的趋势。相比之下，单个T丛下土壤N、P化学计量的水平变化较小。chinensis在表层土壤中的含量大于下层土壤。氮、磷含量从冠层中心向外逐渐降低。相反，N/P比值的趋势相反。对于水平的变化。与干旱、半干旱地区的生态系统相似，半湿润地区的植被也能形成肥沃的岛屿，对土壤养分循环产生重要影响。在一个单一的T群下形成肥沃的岛屿。羊草对土壤N、P化学计量有显著影响。在肥沃岛屿的影响下。但肥岛效应对莱州湾滨海湿地土壤N、P化学计量的影响还有待进一步研究。chinensis群落相对较小，说明肥岛效应在群落水平上的影响并不显著。因此，在更大尺度上，环境因子对土壤N、P化学计量的影响可能大于湿地肥岛效应的影响。
PurposeAs a useful comprehensive index for reflecting nutrient cycling in soils, nitrogen (N) and phosphorus (P) stoichiometry is subject to influences of many external environmental and biological factors. Studies on such influences were limited, and the influential mechanism remains unclear. The purpose of this research is to investigate soil N and P stoichiometric variations and analyze “fertile island” effects ofTamarix chinensisLour. (T. chinensis) in the coastal wetland of Laizhou Bay in China.Materials and methodsSoil samples beneath clusters and communities ofT. chinensiswere collected respectively in July 2012. Amounts of ammonium, nitrate, and available phosphorus in the soil samples were measured through the corresponding standard methods for material measuring.Results and discussionIn general, there were significant vertical variations in soil N and P stoichiometry beneath clusters and communities ofT. chinensis. A downtrend was observed for N and P contents with the increase in soil depth. On the contrary, the N/P ratio revealed a trend of going up first and then dropping off along with the increase of the soil depth. Comparatively, the horizontal variations in the soil N and P stoichiometry beneath a single cluster ofT. chinensiswere greater in the topsoil than those in the subsoil. The N and P contents gradually decreased from the canopy center to the outside. On the contrary, an opposite trend was found for the N/P ratio. For the horizontal variations beneathT. chinensiscommunities, there were no significant differences for either N and P contents or N/P ratios.ConclusionsSimilar to the ecosystems in arid and semi-arid areas, vegetations in many semi-humid areas could also form fertile islands and exert significant influences on the soil nutrient cycle. The formation of fertile islands beneath a single cluster ofT. chinensiscould have significant influence on soil N and P stoichiometry. Under the influence of fertile islands beneathT. chinensis, the limiting element of the biogeochemical processes in the coastal wetland of Laizhou Bay might change from N to P. However, the influences of fertile island effects on soil N and P stoichiometry beneathT. chinensiscommunities were relatively small, illustrating that the influences of fertile island effects was not significant at the community level. Thus, the impacts of environmental factors on soil N and P stoichiometry might be greater than that of the fertile island effects in the wetland on a larger scale.