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<i>|</i><span>来源：《科技日报》2015年4月24日</span><i>|</i><span>作者：瞿剑</span> </div> <div id="ddvpr3yjlwe" class="article_control"> <div id="ddvpr3yjlwe" class="size"> <span id="ddvpr3yjlwe" class="fs14">字体</span> <a class="size3 size_min"><i class="iconfont nky-article_size1 fs14"></i>小</a> <a class="size2 size_mid"><i class="iconfont nky-article_size2 fs14"></i>中</a> <a class="size1 size_max"><i class="iconfont nky-article_size3 fs14"></i>大</a> </div> </div> <div id="ddvpr3yjlwe" class="article fs16 lh28"> 科技日报哈尔滨4月21日电（记者瞿剑）4月22日“世界地球日”到来之际，中国农科院21日启动“东北黑土地保护协同创新行动”，以举全国相关学科之力，遏制我国东北黑土地的退化。 <p> 据项目组首席科学家、中国农科院<a target="_blank">资划所</a>研究员徐明岗介绍，东北黑土地是世界三大黑土带之一，面积103万平方公里，是我国农业生产规模化，机械化程度最高的区域。但受自然和人文因素的双重作用，黑土地自然肥力及生态机能有逐年退化趋势。</p> <p> “东北黑土地?；ば葱滦卸?rdquo;将明确东北黑土地地力退化的过程与成因，提出适合东北典型生态类型区的黑土地?；す丶际跤牍娣?，构建黑土地?；すこ碳际跤胫С疟Ｕ咸逑担迪侄焙谕恋氐某中改芰岸绷覆值奈榷ㄊ淞改芰ΑＭü痉锻乒?，到2019年项目示范区耕地基础地力提高1个等级（相当于产量提高50—100公斤/亩）；秸秆等有机肥资源利用率提高50%以上，土壤有机质含量平均提升10%，土壤pH值保持在6.0—7.5之间，旱地耕层厚度25—30公分以上；氮肥利用率提高5个百分点；降水利用率提高10%以上，农作物水分利用效率提高0.1公斤/毫米·亩。</p>  </div>  <div id="ddvpr3yjlwe" class="article_bottom_btns"> <div id="ddvpr3yjlwe" class="article_btn print fs12 pr" onclick="javascript:window.print()"><i class="iconfont nky-article_print fs24 pa-l"></i>打印本页</div> <div id="ddvpr3yjlwe" class="article_btn close fs12 pr" onclick="window.close();return false;"><i class="iconfont nky-article_close fs20 pa-l"></i>关闭本页</div> </div> </div> </div> <div id="ddvpr3yjlwe" class="rt3"> <a class="sub_051a item fs20 lh24" href="../../ywxxfbygl/index.htm">院网信息发布与管理</a> <a class="sub_channel_title03" href="../../ywxxfbygl/index.htm"> <div id="ddvpr3yjlwe" class="more"></div> <div id="ddvpr3yjlwe" class="title fs20">最新动态</div> </a> <div id="ddvpr3yjlwe" class="sub_031a 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