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何 涛,李家兵,孙志高,高 会,范爱连.闽江河口芦苇与短叶茳芏空间扩展过程中植物-土壤系统硫含量变化特征.生态学报,2018,(5).http://dx.doi.org/10.5846/stxb201703060374  
闽江河口芦苇与短叶茳芏空间扩展过程中植物-土壤系统硫含量变化特征
Variations of Total Sulfur Contents in Plant-soil Systems of Phragmites australis and Cyperus malaccensis in the Process of Their Spatial Expansion in the Min River EstuaryHE Tao1, LI Jiabing2, SUN Zhigao1,GAO Hui1,FAN Ailian1
投稿时间:2017-03-06  修订日期:2017-10-14
DOI: 10.5846/stxb201703060374
关键词  植物-土壤系统  空间扩展  湿地  闽江口
Key WordsTotal sulfur  Plant-soil system  Spatial extension  Marsh  Min river estuary
基金项目福建省公益类科研院所重点项目(2016R1032⁃1); 福建省高等学校“新世纪优秀人才计划”项目和福建省“闽江学者奖励计划”项目; 大学生创新创业训练计划(201610394011)
作者单位E-mail
何 涛 福建师范大学地理研究所 het_1993@163.com 
李家兵 福建师范大学环境科学与工程学院  
孙志高 福建师范大学地理研究所 zhigaosun@163.com 
高 会 福建师范大学地理研究所  
范爱连 福建师范大学地理研究所  
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摘要:
2015年7月,选取闽江河口鳝鱼滩的芦苇湿地、短叶茳芏湿地以及二者交错带湿地为对象,研究了两种植被空间扩展过程中植物-土壤系统全硫(TS)含量的空间变化特征。结果表明,不同湿地表层土壤的TS含量表现为交错带湿地>短叶茳芏湿地>芦苇湿地,其差异主要与两种植被的空间扩展改变了交错带湿地土壤的质地及有机质等参数,进而对硫的迁移及转化过程产生重要影响有关;交错带不同植被的根系分布及其对土壤硫养分的竞争导致土壤TS含量的水平和垂直变异性均较芦苇或短叶茳芏纯群落发生较大改变,其土壤的TS含量受芦苇根系分布的影响更为明显,含量和储量均在深层土壤中较高。芦苇与短叶茳芏的空间扩展改变了两种植被的株高、密度及生物量分配格局,尽管二者在交错带中的地下生物量分配比均高于纯群落,但芦苇地下空间占据能力要高于短叶茳芏。研究发现,芦苇与短叶茳芏的空间扩展是双向过程,二者在空间扩展中通过不同的硫养分吸收、累积与分配策略适应竞争环境,即交错带湿地中的芦苇通过增加根部对硫养分的累积能力来保持其竞争力,而短叶茳芏则通过拓展地上空间及提高地上器官的硫养分累积能力来抗衡芦苇的空间扩展。
Abstract:
To investigate the variations of total sulfur (TS) contents in plant-soil systems of Phragmites australis and Cyperus malaccensis in the process of their spatial expansion in Shanyutan of the Min River estuary, P. australis marsh (PM), C. malaccensis marsh (CM) and their ecotone (P. australis-C. malaccensis marsh, PCM) were studied in July 2015. Results showed that the TS contents in soils of different marshes were generally in the order of CM>PCM>PM and the differences among them were mainly related to the alteration of soil texture and organic matter caused by the spatial expansion of P. australis and C. malaccensis, which further produced great influences on the S transfer and transformation processes.The horizontal and vertical variations of TS contents in the PCM soils were significantly different with those in the PM or CM community, which was due to the root distribution of different plants in the ecotone and their competition in S nutrient. The TS contents in soils of PCM were more affected by root distribution of P. australis and its TS contents and stocks were generally higher in deep soil. The TS contents in soils of PCM were more affected by root distribution of P. australis and its TS contents and stocks were generally higher in deep soil. The spatial expansion greatly altered the height, density and biomass allocation of the two plants, and although their allocation patterns of belowground biomass in the ecotone were generally higher than those in the pure communities, the P. australis showed higher occupying capacity in belowground space than that of C. malaccensis. This study found that the space expansion of P. australis and C. malaccensis was bi-direction, which could adapt the competitive environment by taking different strategies in S uptake, accumulation and allocation. The P. australis in the ecotone could keep its competition most by increasing the S accumulation capacity of its roots while the C. malaccensis in the ecotone was able to resist the space expansion of P. australis by expanding its aboveground space and increasing the S accumulation capacity of aboveground organs.
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