1 resultado para Exeter Cathedral.
em Chinese Academy of Sciences Institutional Repositories Grid Portal
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土壤侵蚀是全球性的严重环境问题 ,而农耕地则是全球土壤侵蚀最严重的地区。农地上存在的水力等侵蚀早已被研究者认识到 ,并且已进行了大量的研究 ,但农地上存在的另一种侵蚀 ,也是从根本上导致农地土壤退化及产生严重水土流失的侵蚀 ,却在以往的土壤侵蚀研究中被大大地忽视 ,这就是耕作侵蚀。耕作侵蚀是土壤物质在耕作机具的作用下发生分散、搬运、沉积的过程。在耕作侵蚀过程中 ,土壤物质主要在农地内发生再分布 ,在坡地上 ,这种再分布则主要表现为坡面土壤的从上向下运动。耕作侵蚀作为一种新近认识到的重要侵蚀过程 ,已引起国际上的广泛关注。耕作侵蚀研究也已在各大洲迅速开展起来。 1997年起 ,欧共体将耕作侵蚀列为大型研究项目 ,组织了 7个国家的科学家协作攻关 ,研究范围包括到全部欧共体国家 ;1997年 7月在加拿大多伦多 (Toronto)举行了第 1次耕作侵蚀国际会议 ;1999年 4月在比利时鲁汶 (L euven)举行了第 2次耕作侵蚀国际会议 ;2 0 0 1年 8月将在英国埃克塞特 (Exeter)再次举行关于耕作侵蚀影响的重要国际会议。我国是一个幅员辽阔 ,农业人口众多 ,耕种历史悠久的农业大国 ,坡耕地面积大...