Diversity and Chemical Composition of Weeds in Sand-Filled Mangrove Forest at Eagle Island, Niger Delta, Nigeria

• 作者: Aroloye Ofo Numbere
• 来源期刊: 美国植物学期刊(英文)
• 学科: 数学
• 关键词: Heavy Metals Mangrove Weed Soil Species Diversity Sand Fill SWAMP
• 年，卷（期）: mgzwxqkyw_2020,（7）
• 页码范围: 994-1007
• 页数: 14页
• 分类号: O17

摘要

Mangroves are habitat specific and grow mainly in swampy soil, but due to anthropogenic activities (e.g. sand mining) other species had encroached into their habitat. It is thus hypothesized that change in species diversity will lead to change in soil chemistry. In a 40 m × 90 m plot, diversity index (<i><span style="font-family:Verdana;">H</span></i><span style="font-family:Verdana;">) and importance value (</span><i><span style="font-family:Verdana;">I</span>_{<span style="font-family:Verdana;">v</span>}</i><span style="font-family:Verdana;">) of weed were estimated. Soil and weed samples were collected and analyzed for total hydrocarbon content (THC), Zinc (Zn), Lead (Pb) and Cadmium (Cd). All samples were analyzed with atomic absorption spectrophotometric method using the HACH DR 890 calorimeter (wavelength 420 nm). The result shows that swampy soils were more acidic (3.1 - 3.5) than sandy soils (4.2 - 4.7). Swampy soil was also more saline and thus has higher conductivity (8320 - 9880 μS/cm) than sandy soil (4320 - 5650 μS/cm). Mangrove swamp had higher total organic carbon (TOC) (2.25% - 3.41%) than sandy soil (0.12% - 0.21%). There was a significant difference in THC and heavy metals in soil (F</span>_{<span style="font-family:Verdana;">8,63</span>}<span style="font-family:Verdana;"> = 2.04, P < 0.05), but there was no significant difference in THC and heavy metals in plant species (F</span>_{<span style="font-family:Verdana;">8,63</span>}<span style="font-family:Verdana;"> = 247.0, P > 0.05). Concentration of THC and heavy metal was higher in plant than in soil. </span><i><span style="font-family:Verdana;">Reissantia</span></i> <i><span style="font-family:Verdana;">indica</span></i><span style="font-family:Verdana;">, an aquatic weed, had the highest concentration of THC in root soil. A total of fifteen (15) weed species were identified, out of which </span><i><span style="font-family:Verdana;">Mariscus</span></i><span> <i><span style="font-family:Verdana;">longibracteatus</span