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一九八四年调查了海原县林业生产的一些典型,并与科技人员进行了座谈。根据调查所得,写成本文供参考。一、海原林业应有较大的发展1.自然条件适于发展林业,该县光照充足,气候温和。大部地区年均温6.4～8.6℃。除南华山顶部较冷,(?)10℃的活动积温仅有1320～1972℃外,大部地区为2000～3200℃,且持续期长达107～172天。历年平均最高温34.2℃,最低-24℃。大部地区的无霜期155～181天。
In 1984, it surveyed some typical examples of forestry production in Haiyuan County and held discussions with scientific and technological personnel. According to the survey, write the text for reference. A, Haiyuan forestry should have greater development 1. Natural conditions suitable for the development of forestry, the county adequate light, mild climate. Most areas with an average annual temperature of 6.4 ~ 8.6 ℃. Except that the top of Nanhuashan Mountain is colder, the active accumulated temperature of (?) 10 ℃ is only 1320 ~ 1972 ℃, most of the region is 2000 ~ 3200 ℃, and the duration is as long as 107 ~ 172 days. The average annual maximum temperature 34.2 ℃, the lowest -24 ℃. Frost-free period in most areas 155 to 181 days.