Differential Flooding Impacts on Echinochloa caudata and Scirpus planiculmis: Implications for Weed Control in Wetlands
Differential Flooding Impacts on Echinochloa caudata and Scirpus planiculmis: Implications for Weed Control in Wetlands
复制标题
不同的洪水对稗草和三棱草的影响：对湿地杂草控制的影响
DOI：
10.1007/s13157-016-0805-0
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发表时间：
2016-10-01
期刊：
影响因子：
2
通讯作者：
Lu, Xianguo
中科院分区：
文献类型：
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作者：
Liu, Bo;Jiang, Ming;Lu, Xianguo
平棘猴（Scirpus planiculmis）是常见于湿地块茎的多年生草本植物，是莫莫格国家级自然保护区西伯利亚白鹤（Grus leucogeranus）的主要食料。然而，在莫莫格湿地的大部分复湿地，仅靠种子繁殖的一年生杂草棘皮藻（Echinochloa caudata）成为优势种，降低了西伯利亚白鹤的栖息地质量。在发芽的前几天，早期的洪水会杀死许多物种的植物幼苗，因此可以用来有效地抑制不需要的物种。通过盆栽试验，研究了不同淹水深度对尾尾草和平棘草再生的影响。研究评估了5种水深（相对于沉积物表面的- 5、0、5、10和20 cm水深）和4种淹水状态（播种后1、4、8和16天）。结果表明，0 cm的水深最有利于尾螺幼苗的存活和生长。10和20 cm的水深显著降低了1、4和8 DAS时尾尾藤幼苗的存活率和生物量积累。1、4 DAS淹水时，0 ~ 10 cm淹水对尾藤苗高没有影响，8、16 DAS淹水时，5 ~ 20 cm淹水可提高尾藤苗高。淹水对沙菖蒲的茎数、株高和干生物量影响不显著。本研究结果为平头白鹤占优势的湿地水文控制提供了有价值的信息，并可用于保护西伯利亚白鹤的栖息地。
Scirpus planiculmis, a perennial herb typically grown from tubers in wetlands, is the main food species for migratory Siberian white crane (Grus leucogeranus) in Momoge National Nature Reserve (MNNR), northeastern China. However, Echinochloa caudata, an annual weed propagated only from seed, became the dominant species in the majority of the rewetted site in Momoge wetland, which decreased the habitat quality for Siberian white crane. Early flooding during the first few days of germination kills plant seedlings of many species and thus may consequently be used to effectively suppress undesired species. A pot experiment was conducted to determine the effects of different flooding depths on the regeneration of both E. caudata and S. planiculmis. Five water depths (−5, 0, 5, 10 and 20 cm water depth relative to sediment surface) and four flooding regimes (one, four, eight and 16 days after sowing (DAS)) were evaluated. The results showed that 0 cm water depth was most favorable for both the survival and growth of E. caudata seedlings. Water depths of 10 or 20 cm significantly reduced both the survival rates and biomass accumulation of E. caudata seedlings at one, four or eight DAS. Seedling height of E. caudata was not affected by water depths of 0–10 cm when flooded at one or four DAS and was increased by flooding (5–20 cm water depth) when the flooding was delayed to eight or 16 DAS. Flooding did not significantly affect the shoot number, plant height or dry biomass of S. planiculmis. Our results provide valuable information for the control of E. caudata using hydrology in wetlands dominated by S. planiculmis, and these strategies can be used to protect the habitat of the Siberian white crane.