黄河口新生湿地碱蓬生物量及氮累积与分配对外源氮输入的响应

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 黄河口新生湿地碱蓬生物量及氮累积与分配对外源氮输入的响应 DOI: 10.5846/stxb201607261523 作者: 作者单位: 福建师范大学,福建师范大学地理科学学院,路易斯安那州立大学植物、环境与土壤科学系,成都信息工程学院资源环境学院,鲁东大学地理与规划学院,福建师范大学 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金面上并且项目（41371104，41171424）；福建省“闽江学者奖励计划”资助项目 Biomass and nitrogen accumulation and allocation in Suaeda salsa in response to exogenous nitrogen enrichment in the newly created marshes of the Yellow River Estuary, China Author: Affiliation: Fujian Normal University,Fujian Normal University,School of Plant, Environment and Soil Science, Louisiana State University,Department of Resources and Environment, College of Information and Engineering,Department of Geography and Planning, Ludong University,Fujian Normal University Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:2014年4-11月，选择黄河入海口北部滨岸高潮滩的碱蓬湿地为研究对象，基于野外原位氮输入模拟试验，研究了不同氮输入梯度下（N0，无氮输入；N1，低氮输入；N2，中氮输入；N3，高氮输入）碱蓬不同器官生物量以及氮累积与分配特征的差异。结果表明，尽管不同氮输入处理并未改变碱蓬地上生物量的季节变化模式，但在不同程度上均促进了地上生物量的增长（平均增幅为19.71%-62.29%）且整体表现为N3 > N2 > N1 > N0；不同氮输入处理亦延长了碱蓬的生长高峰期，N1、N2和N3处理下地上生物量达到最大值的时间相对于N0处理推迟20 d左右。与地上生物量不同，不同氮输入处理改变了地下生物量的季节变化模式，特别是N2和N3处理均对生长初期的地下生物量产生了明显促进作用，且其初期地下生物量达到较高值的时间相对于N1和N0处理提前20-50d。不同氮输入处理下的枯落物量在产生初期和中期均增幅不大，末期则骤然增加且整体表现为N3 > N2 > N1 > N0。不同氮输入处理下碱蓬各器官的全氮（TN）含量总体上均表现为叶 > 茎 > 根，叶是氮的主要累积器官。尽管不同氮输入处理并未改变碱蓬不同器官的氮累积与分配格局以及地上与地下之间的养分供给关系，但其为适应不同养分条件而调整自身养分供给与分配的特性在N2处理下表现的尤为明显。研究发现，N2处理下碱蓬种子的发育时间相对于N0、N1和N3处理可能会提前约1个月，原因可能与N2氮输入水平可显著影响碱蓬体内的碳分配比以及碱蓬对适量氮养分输入环境的特殊适应对策有关。随着黄河口新生湿地氮养分供给的不断增加，当未来碱蓬湿地氮养分状况达到较高水平（特别是中等水平）时，其生物量、生长节律（特别是种子发育时间）以及不同器官氮累积与分配状况可能将发生明显改变。 Abstract:We examined the influence of different nitrogen (N) import treatments on organ biomasses and patterns of N accumulation and allocation in Suaeda salsa growing in the high tidal flat marshes of the northern Yellow River Estuary. Although patterns in the seasonal variation of aboveground biomass were unaffected by the different N import treatments, aboveground biomass of S. salsa was generally enhanced (by 19.71%-62.29%), in the order N3 > N2 > N1 > N0; moreover, N import treatments prolonged the period of peak growth of S. salsa, and, in the N1, N2, and N3 treatments, attainment of the maximum aboveground biomass was delayed by approximately 20 days compared to that in the N0 treatment. In contrast with aboveground biomass, different N import treatments altered the seasonal variation patterns of belowground biomass, especially plants subjected to the N2 and N3 treatments. Compared to the N1 and N0 treatments, in the N2 and N3 treatments, the greater abundance of belowground biomass in the early growth period was shifted forward by 20-50 days. Litter amounts increased slightly during the initial stages, but rapidly in the final stage, in the order of N3 > N2 > N1 > N0. Total nitrogen (TN) concentrations in different organs of S. salsa under different N import treatments generally followed a leaf > stem > root pattern, indicating that leaves were the key tissues of N accumulation. Although different N import treatments did not alter the patterns of N accumulation and allocation in different organs of S. salsa or the nutrient supply relationships between aboveground and belowground tissues, adaptation to different nutrient conditions was particularly evident in plants in the N2 treatment. This study found that the growth time of S. salsa seeds under N2 treatment conditions was advanced by approximately one month compared to the N0, N1, and N3 treatments, for two probable reasons:first, carbon allocation in S. salsa was significantly affected by N2 import level, and second, S. salsa may have unique adaptation strategies for coping with fluctuating nutrient inputs. In summary, the increasing supply of N in the newly created marshes of the Yellow River Estuary may significantly alter the biomass, growth rate (especially in regard to seed growth time), and N accumulation and allocation in different organs of S. salsa plants growing in this system 参考文献 相似文献 引证文献