月別ページ/10月2013年

河川堤防の草刈りと外来牧草 ~ 牧草は侵略的外来種?

 平成25年10月11日、今日は良い天気。
 遅い真夏日を更新しました。
 明治8(1875)年の観測開始から最も遅い真夏日なんだそうです。
 しばらく台風が続き、ぐずついた天気がつづきました。
 台風一過。溜まった洗濯物を干しましょう。
   
  写真 写真
  
 江戸川を越した松戸側では、外環道の工事が急ピッチで進められています。
  
 河川堤防では、草刈りが行われました。
 草刈りをした後が、黄ばんで見えます。
  
 河川堤防のような開かれた明るい空間の処は、外来牧草が生育し易い環境となります。
 当初、野芝を張り付けでも、河川堤防は、野芝が永続できる環境では無いため、
 植生は遷移してしまいます。
  
 野芝(低草高草原)⇒外来牧草(高草高草原)⇒低木叢林(ブッシュ)⇒高木林、
 と推移(遷移)してゆくのは自然の摂理です。
 傷ついた自然の回復過程でもあります。
  
 しかし、河川管理の都合上、堤防は草原状を保たなければいけません。
 このため、植生遷移という自然の流れ、自然治癒の流れを、力づくで止めなければなりません。
 それが草刈りです。
 草丈の低い野芝の状態を保つためには、野芝を覆ってしまう草丈の高い植物を刈り取ることが
 必要です。
 つまり高頻度で草刈りを行うことが必要となります。
  
 でも、予算が無いという理由で草刈り回数を減らしてしまいます。
  
 現在の草刈り管理の密度(回数)は、外来牧草の生育に適したものとしているのです。
 結果、外来牧草が繁茂します。
  
 しかし、人間様は、在来植物と競合するものとして外来牧草が悪いとしてしまいます。
 生物多様性保全上、侵略的外来種は駆逐・管理をする方向へと進められております。
  
 予算がないからと言って、外来牧草が繁茂する環境を造り、提供しておきながら、一方では、
 外来種である牧草が生育したから悪い、との賜っております。
  
 分裂病気味の、変な理屈だなと思うのは私だけでしょうか?
 全体を俯瞰することなく、それぞれの立場のみでの自己主張のみ。
 ご都合主義とでも言うのでしょうか。
  
 生き物に対する眼差しは、思いやりのある、優しさが基本のはずです。
 しかし、理念とご都合主義が横行すると、部分、抹消にこだわり、自然の全一性、総合性を
 見失います。
 結果、人間性までをも見失っているような気がします。
  
 このような現象を、縦割りの弊害と申します。
 部分最適はできますが、全体俯瞰ができません。
 日本全体が犯されている病理現象です。
 グランドデザイン不在の震災復興、国土経営と病根は同じです。
  
 あるいは、受験勉強一本槍。
 目の前の問題を効率的に解くことだけを教え込んだ結果でしょうか?


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