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保护黑土地,国家再出台重磅文件,这几种农机迎来利好!

2021-08-05 17:18:39 来源:农机网原创 阅读量:53464 评论

导读:我国一直实施严格的耕地保护制度,做到“像保护大熊猫一样保护耕地”,而黑土地就是“耕地中的大熊猫”。

  【农机网 政策导读】 众所周知,黑土地是地球上珍贵的土壤资源,是一种性状好、肥力高、适宜农耕的优质土地。自然黑土是千万年前在砂砾和黏土层上发育的土壤,在雨热同季的气候下,形成了茂密的植被层,经过几千年的时间演变,才变成了深厚肥沃的黑土层。北半球拥有三块著名的黑土地:一块在美洲——美国的密西西比河流域;一块在欧洲——乌克兰的第聂伯河流域;一块在亚洲——中国的东北平原。
 
  基于肥沃的黑土地,东北产粮区的年粮食产量占全国1/4,商品量占全国的1/4,调出量占全国的1/3,是不折不扣的“压舱石”、“稳压器”。然而,这一珍贵的土壤资源却正在面临着退化甚至消失的风险。自20世纪开垦以来,东北地区的黑土层平均厚度由50厘米至60厘米下降到30厘米左右,土壤耕层的有机质含量下降了50%至60%,年均下降速率约为5‰。
 
  我国一直实施严格的耕地保护制度,做到“像保护大熊猫一样保护耕地”,而黑土地就是“耕地中的大熊猫”。
 
  虽然近些年来一系列保护、治理措施初见成效,但是黑土耕地退化趋势尚未得到有效遏制。已经实施综合性治理措施的黑土耕地面积占比较低,坡耕地水土流失仍较重,耕作层变薄和侵蚀沟问题仍然突出,土壤有机质含量下降趋势仍未扭转,局部酸化、盐渍化问题仍然存在。要长久保护黑土地,还需要多措并举,持续推进,久久为功。
 
  多年来,国家出台多项制度保护黑土地。2017 年,原农业部、发展改革委等 6 部门印发了《东北黑土地保护规划纲要(2017—2030 年)》,明确到2030 年在东北典型黑土区实施 2.5 亿亩黑土耕地保护任务。2020 年,农业农村部和财政部印发《东北黑土地保护性耕作行动计划(2020—2025 年)》,明确到 2025年在东北地区适宜区域实施以免耕少耕秸秆覆盖还田为主要内容的保护性耕作 1.4 亿亩。
 
  在此基础上,今年6月,农业农村部、国家发展和改革委员会、财政部、水利部、科学技术部、中国科学院、国家林业和草原局等7部门又印发了《国家黑土地保护工程实施方案 (2021—2025年)》(以下简称《方案》),针对黑土耕地出现的“薄、瘦、硬”问题,着重实施土壤侵蚀治理,农田基础设施建设,肥沃耕作层培育等措施。
 
  《方案》明确,2021—2025 年,实施黑土耕地保护利用面积 1 亿亩(含标准化示范面积 1800 万亩)。其中,建设高标准农田 5000 万亩、治理侵蚀沟 7000 条,实施免耕少耕秸秆覆盖还田、秸秆综合利用碎混翻压还田等保护性耕作5 亿亩次(1 亿亩耕地每年全覆盖重叠 1 次)、有机肥深翻还田 1 亿亩。到“十四五”末,黑土地保护区耕地质量明显提升,旱地耕作层达到 30 厘米、水田耕作层达到 20—25 厘米,土壤有机质含量平均提高 10%以上,有效遏制黑土耕地“变薄、变瘦、变硬”退化趋势,防治水土流失,基本构建形成持续推进黑土地保护利用的长效机制。
 
  《方案》指出,实施保护性耕作。优化耕作制度,推广应用少耕免耕秸秆覆盖还田、秸秆碎混翻压还田等不同方式的保护性耕作。在适宜地区重点推广免耕和少耕秸秆覆盖还田技术类型的“梨树模式”,增加秸秆覆盖还田比例。其余地区,改春整地为秋整地,旱地采取在秋季收获后实施秸秆机械粉碎翻压或碎混还田。
 

 

  实施有机肥还田。秋季根据当地土壤基础条件和降雨量特点,推行深松(深耕)整地,以渐进打破犁底层为原则,疏松深层土壤。利用大中型动力机械,结合秸秆粉碎还田、有机肥抛撒,开展深翻整地。在粪肥丰富的地区建设粪污贮存发酵堆沤设施,以畜禽粪便为主要原料堆沤有机肥并施用。
 
  结语:可以看出,免耕播种、深松整地、秸秆粉碎还田、有机肥抛撒、畜禽粪污处理处理等相关农机装备是黑土地保护中的主要机械,这几类农机将迎来重要发展机遇。
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