海岛森林不同演替阶段土壤和植物的碳、氮、磷化学计量特征
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引用本文:张增可,吴雅华,黄柳菁,刘兴诏.海岛森林不同演替阶段土壤和植物的碳、氮、磷化学计量特征[J].西北植物学报,2019,39(5):925~934
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作者单位
张增可,吴雅华,黄柳菁,刘兴诏* (福建农林大学 园林学院福州 350002) 
基金项目:国家自然科学基金(31800401);
中文摘要:该研究采用空间代替时间的方法,对福建省东部海域的平潭岛林区不同演替阶段群落(灌草丛、针叶林、针阔混交林、常绿阔叶林)的土壤和植物的C、N、P含量进行测定,分析不同演替阶段土壤和植物的C、N、P 及生态化学计量特征的变化规律,并探讨植物与土壤养分之间的相互关系。结果表明:(1)由于土壤C、N、P的来源不同,导致土壤有机碳(SOC)和全氮(STN)含量随着演替进行逐渐增加,土壤全磷(STP)含量呈先下降后上升的趋势;土壤C∶N随演替进行呈增加趋势,土壤C∶P和N∶P呈先升高后下降的趋势。(2)植物叶片碳(LC)含量随着演替进行呈先升高后下降的趋势,叶片氮(LN)和磷(LP)含量呈先下降后升高的趋势,反映了各演替阶段植物采取不同的生态适应性;植物叶片C∶N和C∶P随演替进行呈先升高后下降的趋势,植物叶片N∶P呈逐渐增加的趋势。(3)相关分析表明,土壤SOC与STN呈显著正相关关系,表明土壤C、N元素有较强的耦合关系;植物LN与LP呈显著正相关关系,共同反映植物的光合作用;植物叶片LP与土壤STP呈显著正相关关系,且植物叶片N∶P在各演替阶段均大于16,说明平潭岛植物生长主要受到土壤P限制。
中文关键词:生态化学计量  演替阶段  平潭岛  生态策略
 
C, N and P Stoichiometry of Soil and Plant in Different Forest Successional Stages in Island
Abstract:This study uses an approach of space sequence instead of temporal sequence, we measured C, N and P contents and C∶N, C∶P, N∶P ratios of the leaves of dominant species and soil in four forests, in Pingtan Island, eastern of Fujian Province, China: shrub grassland, coniferous forest, coniferous and broad leaved mixed wood and broad leaved forest. The aim was to analyse the summary of changes in C, N and P stoichiometry of plant and soil in different forest successions, and explored the relationship between plant and soil of nutrition in Pingtan Island. The results showed that: (1) because the sources of C, N and P in soil was differential, the soil organic carbon (SOC) and total nitrogen content (STN) increased with succession. The soil total phosphorus (STP) content decreased initially, and then increased. Soil C: N ratio gradually increased with succession, Soil C∶P and N∶P ratios increased initially, and then decreased. (2) With progress in succession, plant leaf carbon (LC) content increased initially, and then decreased; Leaf nitrogen (LN) content and phosphorus (LP) content decreased initially, and then increased, which reflected that plants adopted different ecological adaptability in each successional stage. Leaf C∶N and C∶P ratios increased initially, and then decreased; Leaf N∶P ratio gradually increased with succession. (3) The correlation analysis showed that was a significant positive correlation between soil SOC and STN, which means a strong coupling relationship between soil C and N. A significant positive correlation was observed between plant LN and LP which together reflected the photosynthesis of plants. LP content was significantly and positively correlated with STP, and the N∶P ratio of leaves was greater than 16 in each successional stage. These results indicated that the growth of plants was mainly restricted by soil P in Pingtan Island.
keywords:ecological stoichiometry  successional stages  Pingtan Island  ecological strategy
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