15,650
次編輯
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無編輯摘要
全国造林树种单一，土壤地力衰退严重，而营造泓森槐混交林可大大改良土壤，根瘤菌能固氮，落叶可肥土。用榆树、杨树、柳树等混交，长势都会更好。泓森槐根系发达，具根瘤，可以固氮，提高土壤肥力，故其耐瘠薄、耐旱性优于杨柳科品种，在贫瘠的土壤中，也能较正常生长。
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| style="background: #FF2400" align= center| '''<big>三北防护林</big>'''
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|<center><img src=https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fn.sinaimg.cn%2Fspider20211130%2F86%2Fw1080h606%2F20211130%2F6901-968836d291ea9195500cd807937b82b8.jpg&refer=http%3A%2F%2Fn.sinaimg.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1669344937&t=01b4447c8b9d9403f0bcf7a05b120ca3 width="300"></center>
<small>[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E4%B8%89%E5%8C%97%E9%98%B2%E6%8A%A4%E6%9E%97&step_word=&hs=0&pn=6&spn=0&di=7146857200093233153&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=2036216819%2C1936967501&os=2260985300%2C1767141942&simid=2036216819%2C1936967501&adpicid=0&lpn=0&ln=1130&fr=&fmq=1666752947950_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined©right=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fn.sinaimg.cn%2Fspider20211130%2F86%2Fw1080h606%2F20211130%2F6901-968836d291ea9195500cd807937b82b8.jpg%26refer%3Dhttp%3A%2F%2Fn.sinaimg.cn%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1669344937%26t%3D01b4447c8b9d9403f0bcf7a05b120ca3&fromurl=ippr_z2C%24qAzdH3FAzdH3Futgwgvj_z%26e3Bftgw_z%26e3Bv54_z%26e3BvgAzdH3Fo4AzdH3Fdad8-88-naAzdH3F15v-thyw464ycl09lad_z%26e3Bfip4s&gsm=1e0000000000001e&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined&dyTabStr=MCwzLDIsMSw3LDQsNiw1LDgsOQ%3D%3D 来自 呢图网 的图片]</small>
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| style="background: #FF2400" align= center| '''<big></big>'''
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==建设期限==
[[山西]]省昕水河流域土壤侵蚀模数已由7175吨下降到3229吨。[[张家口]]市土壤侵蚀模数已由过去的5900吨下降到1550吨，[[官厅水库]]泥沙入库量由899吨减少到235吨，[[潘家口]]和[[密云]]两大水库泥沙入库量分别减少20%和60%。[[辽宁]]省在辽西低山丘陵区营造水土保持林450多万亩，土壤侵蚀模数已由4500—5000吨下降到1500—2191吨。
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| style="background: #FF2400" align= center| '''<big>三北防护林</big>'''
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|<center><img src=https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fn.sinaimg.cn%2Fsinakd20116%2F479%2Fw740h539%2F20220328%2Fced7-84ef6d4ebda6b37e98ead2ec126f240a.jpg&refer=http%3A%2F%2Fn.sinaimg.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1669345023&t=ae98c49ccc1ea85bc47150582d0df654 width="300"></center>
<small>[https://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word=%E4%B8%89%E5%8C%97%E9%98%B2%E6%8A%A4%E6%9E%97&step_word=&hs=0&pn=9&spn=0&di=7146857200093233153&pi=0&rn=1&tn=baiduimagedetail&is=0%2C0&istype=0&ie=utf-8&oe=utf-8&in=&cl=2&lm=-1&st=undefined&cs=3906019844%2C2926862443&os=3776926081%2C392418054&simid=4224918996%2C777358896&adpicid=0&lpn=0&ln=1130&fr=&fmq=1666752947950_R&fm=&ic=undefined&s=undefined&hd=undefined&latest=undefined©right=undefined&se=&sme=&tab=0&width=undefined&height=undefined&face=undefined&ist=&jit=&cg=&bdtype=0&oriquery=&objurl=https%3A%2F%2Fgimg2.baidu.com%2Fimage_search%2Fsrc%3Dhttp%3A%2F%2Fn.sinaimg.cn%2Fsinakd20116%2F479%2Fw740h539%2F20220328%2Fced7-84ef6d4ebda6b37e98ead2ec126f240a.jpg%26refer%3Dhttp%3A%2F%2Fn.sinaimg.cn%26app%3D2002%26size%3Df9999%2C10000%26q%3Da80%26n%3D0%26g%3D0n%26fmt%3Dauto%3Fsec%3D1669345023%26t%3Dae98c49ccc1ea85bc47150582d0df654&fromurl=ippr_z2C%24qAzdH3FAzdH3Fv3_z%26e3Bftgw_z%26e3Bv54_z%26e3BvgAzdH3Fw6ptvsjfAzdH3FetjoAzdH3Fnl8lmanamaAzdH3Fjlwamc09ad0aaxsye&gsm=1e0000000000001e&rpstart=0&rpnum=0&islist=&querylist=&nojc=undefined&dyTabStr=MCwzLDIsMSw3LDQsNiw1LDgsOQ%3D%3D 来自 呢图网 的图片]</small>
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| style="background: #FF2400" align= center| '''<big></big>'''
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==农区防护林==