论文部分内容阅读
甘肃省现有耕地5349万亩,其中山塬旱地占75％以上,主要为中部地区及陇东、天水地区的干旱县。长期以来,这些地区农业生产发展缓慢,产量低而不稳,一般粮食亩产只有100—200斤,有的甚至只有几十斤。其主要原因是:生态平衡失调,干旱多灾,水土流失十分严重。加之水源不足,地下水缺乏,灌溉条件又差。这些状况在较长期内尚无法明显改善。农业生产不得不主要依靠自然降水。因此,探讨研究这些地区对自然降水的利用潜力及应采取的措施,以求提高自然降水的利用效率,具有十分重要的意义。
Gansu Province currently has 53.49 million mu of arable land, of which 75% are dry land in mountainous areas, mainly in the arid county in the central region, Longdong and Tianshui areas. For a long time, the agricultural production in these areas has been developing at a slow pace with low and unstable output. Generally, only 100-200 kg of grain per mu is produced, and some of them are only a few kilos. The main reasons are: ecological imbalance, drought and disaster, soil erosion is very serious. Coupled with lack of water, lack of groundwater, poor irrigation conditions. These conditions can not be significantly improved in the longer term. Agricultural production has to rely mainly on natural precipitation. Therefore, it is of great significance to explore the potential of natural precipitation in these areas and the measures to be taken in order to increase the utilization efficiency of natural precipitation.