怎样防止土地荒漠化
<p>土地荒漠化的防治，要做到“预防为主，因地制宜，全面规划，综合整治，加强管理，注重效益”。对于水蚀作用下的荒漠化土地，要以小流域为单元进行综合治理，上游以防为主，中游防治中结合、以治为主，采取封山育林、营造水源涵养林，陡坡耕地退林还草、坡地改梯田等措施；对于风力作用下的荒漠化土地，在半干旱农牧交错区及旱农区采取扩大林草比重、片林和乔灌草结合固定流沙等措施，在干旱地带沙质荒漠边缘的绿洲地区营造绿洲内部护田林网并在绿洲边缘设置沙障。</p><p><span word="The">The</span> <span word="prevention">prevention</span> <span word="and">and</span> <span word="control">control</span> <span word="of">of</span> <span word="land">land</span> <span word="desertification">desertification</span> <span word="should">should</span> <span word="be">be</span> <span word="based">based</span> <span word="on">on</span> "<span word="prevention">prevention</span> <span word="first">first</span>, <span word="adjusting">adjusting</span> <span word="measures">measures</span> <span word="to">to</span> <span word="local">local</span> <span word="conditions">conditions</span>, <span word="comprehensive">comprehensive</span> <span word="planning">planning</span>, <span word="comprehensive">comprehensive</span> <span word="treatment">treatment</span>, <span word="strengthening">strengthening</span> <span word="management">management</span> <span word="and">and</span> <span word="paying">paying</span> <span word="attention">attention</span> <span word="to">to</span> <span word="benefits">benefits</span>". <span word="For">For</span> <span word="the">the</span> <span word="desertification">desertification</span> <span word="land">land</span> <span word="under">under</span> <span word="the">the</span> <span word="action">action</span> <span word="of">of</span> <span word="water">water</span> <span word="erosion">erosion</span>, <span word="the">the</span> <span word="small">small</span> <span word="watershed">watershed</span> <span word="should">should</span> <span word="be">be</span> <span word="taken">taken</span> <span word="as">as</span> <span word="a">a</span> <span word="unit">unit</span> <span word="for">for</span> <span word="comprehensive">comprehensive</span> <span word="treatment">treatment</span>, <span word="the">the</span> <span word="upstream">upstream</span> <span word="should">should</span> <span word="be">be</span> <span word="mainly">mainly</span> <span word="for">for</span> <span word="prevention">prevention</span>, <span word="the">the</span> <span word="middle">middle</span> <span word="reaches">reaches</span> <span word="should">should</span> <span word="be">be</span> <span word="combined">combined</span> <span word="with">with</span> <span word="prevention">prevention</span> <span word="and">and</span> <span word="control">control</span>, <span word="and">and</span> <span word="the">the</span> <span word="measures">measures</span> <span word="such">such</span> <span word="as">as</span> <span word="closing">closing</span> <span word="the">the</span> <span word="mountain">mountain</span> <span word="for">for</span> <span word="forest">forest</span> <span word="cultivation">cultivation</span>, <span word="building">building</span> <span word="water">water</span> <span word="conservation">conservation</span> <span word="forest">forest</span>, <span word="returning">returning</span> <span word="the">the</span> <span word="steep">steep</span> <span word="slope">slope</span> <span word="farmland">farmland</span> <span word="to">to</span> <span word="forest">forest</span> <span word="and">and</span> <span word="grass">grass</span>, <span word="and">and</span> <span word="changing">changing</span> <span word="the">the</span> <span word="slope">slope</span> <span word="land">land</span> <span word="to">to</span> <span word="terrace">terrace</span> <span word="should">should</span> <span word="be">be</span> <span word="taken">taken</span>; <span word="for">for</span> <span word="the">the</span> <span word="desertification">desertification</span> <span word="land">land</span> <span word="under">under</span> <span word="the">the</span> <span word="action">action</span> <span word="of">of</span> <span word="wind">wind</span> <span word="force">force</span>, <span word="the">the</span> <span word="forest">forest</span> <span word="grass">grass</span> <span word="ratio">ratio</span> <span word="should">should</span> <span word="be">be</span> <span word="expanded">expanded</span> <span word="in">in</span> <span word="the">the</span> <span word="semi">semi</span>-<span word="arid">arid</span> <span word="farming">farming</span> <span word="pastoral">pastoral</span> <span word="area">area</span> <span word="and">and</span> <span word="the">the</span> <span word="dry">dry</span> <span word="farming">farming</span> <span word="area">area</span> <span word="In">In</span> <span word="the">the</span> <span word="oasis">oasis</span> <span word="area">area</span> <span word="of">of</span> <span word="arid">arid</span> <span word="desert">desert</span> <span word="edge">edge</span>, <span word="the">the</span> <span word="inner">inner</span> <span word="forest">forest</span> <span word="net">net</span> <span word="for">for</span> <span word="protecting">protecting</span> <span word="farmland">farmland</span> <span word="and">and</span> <span word="the">the</span> <span word="sand">sand</span> <span word="barrier">barrier</span> <span word="are">are</span> <span word="built">built</span>.</p>
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