【文章內(nèi)容簡介】 ..................................91SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelecSelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec6第一章 項目概要 項目背景土地沙化是我國當前面臨的最為嚴重的生態(tài)問題之一，也是我國生態(tài)建設(shè)的重點和難點。土地沙化不僅使生態(tài)環(huán)境惡化，導(dǎo)致沙區(qū)貧困，而且吞噬國民的生存與發(fā)展空間，阻礙全面建設(shè)小康社會進程，給國民經(jīng)濟和社會可持續(xù)發(fā)展造成了極大危害，已成為中華民族的心腹之患。黨中央、國務(wù)院對防沙治沙工作高度重視，溫家寶同志指出：“治沙工作很重要，如何治理，要統(tǒng)籌規(guī)劃，研究提出具體辦法和項目”。為貫徹落實中央領(lǐng)導(dǎo)同志的指示精神，預(yù)防土地沙化，加快沙化土地的治理步伐，盡快遏制沙化土地不斷擴展的趨勢，根據(jù)《全國生態(tài)環(huán)境建設(shè)規(guī)劃》的要求和《中華人民共和國防沙治沙法》的規(guī)定，國家林業(yè)局會同農(nóng)業(yè)部、水利部、國土資源部、國家環(huán)保總局編制了《全國防沙治沙規(guī)劃》（20222022 年），作為全國防沙治沙工作的宏觀指導(dǎo)性文件。近年來，我國北方地區(qū)頻繁發(fā)生的沙塵暴和浮塵天氣，對包SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelecSelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec7括北京在內(nèi)的我國東部以及朝鮮、日本和美國的夏威夷等地的大氣環(huán)境帶來嚴重污染。古浪縣由于深居歐亞腹地、遠離海洋，水汽不易輸入，冬季受西北部冷高壓的控制，形成干旱少雨、蒸發(fā)量大、晝夜溫差大的荒漠性氣候特征，加上騰格里沙漠豐富的沙源和大陸性氣流作用，土地沙漠化成為該地區(qū)的主要災(zāi)害之一。全縣風沙線長達 132 公里，沙化土地面積 萬畝，占全縣總土地面積的 %，流沙以每年 3—4 米的速度向南推移。沙漠前沿的 792 個村莊、40 萬畝耕地、70 多公里鐵路、170 公里公路受程度不同的風蝕和沙埋，糧食減產(chǎn)總量達 800 萬公斤，直接經(jīng)濟損失達 1200 多萬元，包括清理渠道、路面流沙及改良沙化土地間接投入，實際損失超過 2022 萬元。土地沙漠化加劇了干旱和沙塵暴的發(fā)生，風沙危害及其形成的各種自然災(zāi)害十分嚴重，被國家林業(yè)局防治荒漠化管理中心、國家荒漠化監(jiān)測中心和有關(guān)技術(shù)部門共同確定為沙漠化重點縣，脆弱的生態(tài)環(huán)境成為制約全縣社會經(jīng)濟發(fā)展的“瓶頸”因素。位于沙漠沿線的國有農(nóng)林場和當?shù)厝罕?，從未間斷過治理沙害的歷程，但由于治沙工程投入大，周期長，范圍廣，經(jīng)濟效益低，出現(xiàn)治理面積越大，經(jīng)濟負擔越SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelecSelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesTSelectionParbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbagraphFoLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointse11111111111111111111111111111111lectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraphFormatLineSpaci2222222222222222222222ngLinesToPoints2SelectionParagraphFormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPointselectionParagraphFccccccccccccccccccccccccccccccccccccccccccccccccccccccccormatLineSpacingLinesToPointsSelectionParagraphFormatLineSpacingLinesToPoctionParagraSelec8重的倒掛現(xiàn)象，從整體上來看治理效果并不明