【正文】
提供全套畢業(yè)設(shè)計,各專業(yè)都有 題目 : 七里海濕地植物群落特征及其對全球變化的響應(yīng) 七里海濕地植物群落特征及其對全球變化的響應(yīng) 摘要: 七里海濕地作為天津地區(qū)重要的環(huán)境資源,起到了調(diào)節(jié)氣候、泄洪、涵養(yǎng)水源、為生物提供棲息地等重要作用,對全球變化的響應(yīng)較為敏感。本文以七里海濕地為研究區(qū)域,參考了近幾十年來七里海濕地植物群落的相關(guān)數(shù)據(jù)和資料,結(jié)合七里海濕地變化情況,采用文獻分析方法、比較法以及系統(tǒng)分析法對七里海濕地植物群落的變化進行了分析,總結(jié)了七里海濕地發(fā)生的變化。通過研 究得出結(jié)論,七里海濕地植物群落在近幾十年來,已由自然原始的、復(fù)雜的群落,逐漸演變成了人工的、簡單的人工景觀,只剩下少數(shù)蘆葦群落;同時,七里海濕地面臨著面積驟減、生物多樣性降低、水資源枯竭等問題,這些變化共同作用使得七里海濕地植物群落特征發(fā)生了相應(yīng)的變化。 關(guān)鍵詞: 七里海濕地 ;植物群落;全球變化;響應(yīng) The Characteristics of Plant Community of Qilihai Wetland and its responses to Global Change Abstract: As the important natural resources of Tianjin, Qilihai Wetland contributes to climate control, flood relief and water conservation, and provides habitats for all kinds of anisms, which make the wetland a good responsor to global change. With the relevant data and materials on the plant group of Qilihai Wetland in recent decades as reference and the changes of the wetland as background, the variation of Qilihai Wetland’s plant munity is analyzed in the essay while which of the Qilihai area is collected and summarized. The research methods adopted includes: documentary analysis, system analysis and parison method. After researching, a conclusion can be made: in the recent decades the plant munity has varied from an aboriginal and plex munity to an artificial and simple one with a small number of reed munities left。 meanwhile, Qilihai is faced with such problems as: sharp reduction of wetland area and biodiversity, depletion of water resources and so on. All these changes together bring about the variation of the characteristics of plant munity in Qilihai Wetland. Key words: Qilihai Wetland。 Plant Communities。 Global Change。 Response 目錄 1 七里海濕地概況 ................................................ ( 1) 自然地理 ................................................ ( 1) 地理位置 ............................................. (1) 氣候水文 ............................................. (1) 生物 ............................................... ( 2) 土壤 ............................................... ( 1) 社會經(jīng)濟 ................................................ ( 2) 2 植物群落特征變化 .............................................. ( 2) 3 全球變化情況 .................................................. ( 4) 全球變化定義 ............................................ ( 4) 全球變化背景下七里海濕地主要面臨的變化 問題 .............. ( 5) 濕地面積萎縮 ....................................... ( 5) 生物多樣性降低 ..................................... ( 7) 4 七里海濕地植物群落特征變化對全球變化的響 應(yīng) .................... ( 7) 全球變化對濕地的面積的影響 ............................... ( 7) 全球變化影