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苏联全国现有防护林440万公顷,其中农田防护林160万公顷,牧场防护林40万公顷,沟谷防护林150万公顷,固沙防护林90万公顷。
The Soviet Union currently has a total area of 4.4 million hectares of shelterbelts, including 1.6 million hectares of farmland shelterbelts, 400000 hectares of pasture shelterbelts, 1.5 million hectares of valleys shelterbelts and 900000 hectares of sand-fixing shelterbelts.