对太湖芦苇群落的调查及效益分析
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摘要
近几十年来,由于人类活动的加剧以及全球气候的变化,普遍出现了湖泊萎缩、水位下降、水量锐减、湖水盐化、水质污染、富营养化、甚至干涸消亡等状况。因此作者着力于研究筛选适应性强、能够自我修复、且生物安全隐患小的水生植物来进行水体的恢复。
     通过对太湖水质和水生植物的调查,根据相关文献对水生植物改善水质的机理的研究,我们筛选太湖地区目前的建群种——芦苇作为研究对象,并在太湖苏州吴中段的浅水湾处选择了四个样地,统计了样地的水生植物的种类,并对水生植物的生物量进行了测量,分析了水生植物的生物量、多样性等指标,分析了水体的pH值、透明度、总磷TP、总氮TN、叶绿素a、营养指数、富营养状况等指标,分析了底泥的氮、磷等指标,得出了以下结论:
     1、通过观测,芦苇植株的高度随着水深的增加而增加。这是因为芦苇作为大型的挺水植物,需要从水中挺出水面,去获得CO2和光照以进行光合作用,并且将O2输送到根系进行呼吸和根围的氧化。
     2、一年之中水体的透明度情况是秋季>夏季>春季>冬季。6月、9月,样区湖水透明度较大。
     3、样地的土壤剖面取样测定的有机质含量和氮元素含量与取样的深度有很显著的相关性,有机质含量和氮元素的含量都随着深度的增大而减少。其中30cm处,是一般农业耕作的犁底层,透水性和透气性都很差,是含量变化的分界点。
     4、样区水体富营养化状况在3到9月植物生长旺季有所改善,这是因为植物生长降低了水体中的N、P等营养物质的浓度。
     5、从3到9月叶片的含N量呈增加趋势,实验表明,芦苇在生长初期就具有最强的吸收氮、磷的能力,芦苇生长初期体内氮和磷的含量便能达到一年中的最大值。
In recent years, there are some conditions appeared generally , such as the lakes withered up、water level came done、the quantity of water rapidly declined、lake water Stalinization、water quality contamination、eutrophication, and even dried up or died out ,which due to the intensify of human activities and the world’s climate changing. So the author devoted to studying recovering the water body and screening aquatic plants that have strong adaptability、could repair themselves and have little safety potential to living things.
     Through researching the water quality and aquatic plants of Taihu , according to many documents related that studying the mechanism of aquatic plants to improve the water quality, we screened the edificators in Taihu area ----reed as object of study ,and also chose four sample plots in Taihu Suzhou Wuzhong segment ,measured the types of aquatic plants , researched the live weight of aquatic plants, analyzed the amount and diversity of aquatic plants and the PH value、transparency、total phosphorus(TP)、total nitrogen(TN)、chlorophyll a、nutrient index、eutrophy condition and so on , and also analyzed Nitrogen and Phosphorus index of bottom sediment, reaching the following conclusions:
     1、Through observing, the reed plant’s height increase with the water deep .It’s on account of that reed need to stick out from water surface as a kind of large-scale emergent vegetation, to gain carbon dioxide and illumination to conduct Photosynthesis, and deliver oxygen to root system to breathe and oxidizing rooting zone.
     2、During the whole year,the transparency of water body is autumn>summer>spring>winter. In June and September, the transparency of lake water is the best.
     3、There is prominent relation between organic matter、Nitrogen content measured form soil profile on sample plot and the deep of sampling, these content both reduce as the deep raise. 30 centimeter is one of it, where is usually plough pan in agricultural soil-working, the water permeability and air permeability is bad, and it’s the dividing point of content changing.
     4、Water body eutrophication condition in sample region has a little mend in march and September ,when is the plant growing season , it because that plant growing decrease the concentration of nutritive material as Nitrogen and Phosphorus.
     5、Form march to September ,the Nitrogen content in leaves present an increasing tendency, experiment indicate that ,reed in growing early days has the strongest ability to absorb Nitrogen and Phosphorus, so in growing infancy, the content of Nitrogen and Phosphorus can just reach the highest value during the whole year.
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