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许宇田,童春富.长江口九段沙湿地海三棱藨草生物量分配特征及其影响因子.生态学报,2018,(19).http://dx.doi.org/10.5846/stxb201710241903  
长江口九段沙湿地海三棱藨草生物量分配特征及其影响因子
Biomass allocation characteristics of Scirpus mariqueter and corresponding influencing factors in Jiuduansha Shoals of the Yangtze Estuary
投稿时间:2017-10-24  修订日期:2018-04-20
DOI: 10.5846/stxb201710241903
关键词九段沙  海三棱藨草  生物量分配  影响因子
Key WordsJiuduansha Shoals  Scirpus mariqueter  biomass allocation characteristics  influencing factors
基金项目上海市科委自然科学基金(15ZR1411200)
作者单位E-mail
许宇田 华东师范大学 51163904035@stu.ecnu.edu.cn 
童春富 华东师范大学 cftong@sklec.ecnu.edu.cn 
摘要点击次数 120
全文下载次数 19
摘要:
海三棱藨草(Scirpus mariqueter)为长江河口盐沼湿地先锋植物。以长江口九段沙湿地为主要研究区域,在江亚南沙、上沙、中下沙等不同区域设置固定站点,进行植被和环境因子的取样调研,分析研究了海三棱藨草的生物量分配特征及其主要影响因子,以期为海三棱藨草的培育与恢复、盐沼湿地生态系统的保护与利用提供科学依据。结果表明:(1)不同站点海三棱藨草的茎基高度、球茎生物量占比、根茎与球茎之比均不存在显著差异(P>0.05),而植株密度、植株高度、根茎生物量占比、果实生物量占比、茎叶生物量占比、须根生物量占比、果实与根茎之比、果实与球茎之比在不同站点间存在显著差异(P<0.05);(2)不同站点的沉积物电导率、盐度、容积密度(5—10、25—30 cm土层)、总碳含量(10—15、20—25、25—30 cm土层)、总氮含量(5—10 cm土层)存在显著差异(P<0.05);(3)海三棱藨草的果实与根茎的生物量之比和沉积物5—10、25—30 cm总碳含量,0—5 、5—10 cm总氮含量,0—5 cm容积密度,茎基高度6种因子的组合存在极显著相关(P<0.01);而其他生物量分配指标与本文涉及到的环境因子、植物表形参数均不存在显著相关性(P>0.05)。海三棱藨草生物量分配特征是其自身生长特征与环境因子综合作用的结果。在今后的研究中需拓展生境因子涵盖范围,深入分析多因子综合作用对海三棱藨草生物量分配特征的影响。
Abstract:
Scirpus mariqueter is a typical pioneer plant in the salt marshes of the Yangtze Estuary. A study on the morphological and biomass allocation characteristics, as well as environmental factors, of Scirpus mariqueter were carried out in fixed sampling sites in the Jiuduansha Shoals of the Yangtze Estuary. We aim to provide the scientific basis for the cultivation and restoration of Scirpus mariqueter and the utilization and protection of salt marsh ecosystems. The results showed the following: (1) among the different sites, the stembase height, corm biomass allocation rate, and ratio of rhizome to corm biomass did not show a significant difference (P > 0.05), while the shoot height, shoot density, rhizome allocation rate, fruit allocation rate, shoot biomass allocation rate, root biomass allocation rate, ratio of fruit to corm biomass, and ratio of fruit to rhizome biomass varied significantly (P < 0.05); (2) the sediment salinity, electroconductibility, bulk density (0–5cm, 25–30cm), total carbon content (10–15 cm, 20–25 cm, 25–30 cm), and total nitrogen content (5–10 cm) varied significantly among sites (P < 0.05); (3) only the combination of six factors, including the bulk density (0–5 cm), total carbon content (5–10 cm, 25–30 cm), total nitrogen content (0–5 cm, 5–10 cm) of the sediment, and stembase height of the plant had significant effects on the ratio of fruit to rhizome biomass of Scirpus mariqueter (P < 0.01), but the other environmental factors as well as plant morphological parameters did not show significant correlations with other biomass allocation indices. The biomass allocation characteristics of Scirpus mariqueter were the result of comprehensive effects of the plant growth characteristics and environmental factors. More factors should be included in further studies to reveal the synthetic effects of different factors on the biomass allocation of Scirpus mariqueter.
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