中等强度收割对菹草和伊乐藻种间竞争的影响

生态学杂志

中等强度收割对菹草和伊乐藻种间竞争的影响

左进城^1,2,贺锋²,马剑敏²,周巧红²,曾磊²,孔令为²,胡胜华²,吴振斌^2**

（¹鲁东大学生命科学学院，山东烟台 264025； 2中国科学院水生生物研究所淡水生态与生物技术国家重点实验室，武汉 430072）

出版日期:2014-09-10 发布日期:2014-09-10

Effects of moderateintensity harvesting on interspecific competition between Potamogeton crispus and Elodea nuttallii.

ZUO Jin-cheng^1,2, HE Feng², MA Jian-min², ZHOU Qiao-hong², ZENG Lei², KONG Ling-wei², HU Sheng-hua², WU Zhen-bin^2**

(¹College of Life Sciences, Ludong University, Yantai 264025, Shandong, China；
^2State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China)

Online:2014-09-10 Published:2014-09-10

摘要/Abstract

摘要：

以取代系列实验方法研究了中等强度收割对菹草（Potamogeton crispus）和伊乐藻（Elodea nuttallii）种间竞争的影响。竞争攻击力、相对产量、相对竞争强度、相对拥挤系数等指标表明：收割前后伊乐藻的种间竞争能力强于菹草；收割前单独培养和混合培养的菹草在盖度方面较伊乐藻占有明显优势（P<0.05），但收割后菹草的盖度分别显著降低了33.5%和45.3%（P<0.05），而伊乐藻的盖度显著提高（P<0.05），最终伊乐藻在盖度方面略占优势；收割前，单独培养和混合培养的菹草的株均干重显著地大于伊乐藻(P<0.05），但收割后菹草的株均干重有所下降，伊乐藻的株均干重增长显著（P<0.05）；收割后，两种方式培养的菹草的株均干重显著地小于伊乐藻（P<0.05）；中等强度收割抑制了0～25 cm和25 cm以上部位菹草的分枝和干物质的累积，但促进了伊乐藻在各层分枝和干物质的累积，这将有利于伊乐藻在竞争中取胜；此外，菹草与伊乐藻的种间竞争对植物根的生长影响较小。

关键词: 固沙植物, 水分来源, 根系分布, 生活型

Abstract: A replacement series experiment was carried out to analyze the effects of moderateintensity harvesting on interspecific competition between Elodea nuttallii and Potamogeton crispus. Competition indices such as aggressivity, relative yield, relative competitive intensity and relative crowding coefficient showed that E. nuttallii was the stronger competitor before and after harvesting. P. crispus outcompeted E. nuttallii significantly (P<0.05) in coverage in both the monoculture and the mixed culture before harvesting. However, harvesting resulted in a significant reduction in coverage of P. crispus by 33.5% in the monoculture and 45.3% (P<0.05) in the mixed culture, respectively, and a significant increase in coverage of E. nuttallii (P<0.05). The result showed that E. nuttallii surpassed slightly over P. crispus in terms of coverage. The mean dry weight per plant of P. crispus was greater than that of E. nuttallii in both the monoculture and the mixed culture before harvesting (P<0.05). However, the mean dry weight per plant of P. crispus was obviously lower than that of E. nuttallii after harvesting in both the cultivation modes (P<0.05). The moderateintensity harvesting produced inhibition effects on P. crispus but promotion effects on E. nuttallii in branching and dry matter accumulation in layers of 0-25 cm and above, which would be beneficial for E. nuttallii to win the competition with P. crispus. In addition, the results also showed that root growth was less affected by the interspecific competition.

Key words: sand-binding plant, life form, water source, root distribution

左进城1,2,贺锋2,马剑敏2,周巧红2,曾磊2,孔令为2,胡胜华2,吴振斌2**. 中等强度收割对菹草和伊乐藻种间竞争的影响[J]. 生态学杂志.

ZUO Jin-cheng1,2, HE Feng2, MA Jian-min2, ZHOU Qiao-hong2, ZENG Lei2, KONG Ling-wei2, HU Sheng-hua2, WU Zhen-bin2**. Effects of moderateintensity harvesting on interspecific competition between Potamogeton crispus and Elodea nuttallii.[J]. cje.

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