论文部分内容阅读
根据豫北新乡市1971～2009年的气象资料,从降水量、蒸发量方面,对水分变化特征进行分析,并找出干旱的成因。研究表明,豫北降水量和年蒸发量整体呈下降趋势,干旱趋势增加;农田干旱由大气降水不平衡所造成,但其表现在土壤水的失调上;调控旱作制度,大力发展防旱抗旱的农业技术措施,选用抗旱品种,制定节约用水的各项政策,可有效防御干旱发生。
According to the meteorological data of 1971-2009 in Xinxiang City of Henan Province, the characteristics of water changes were analyzed from the aspects of precipitation and evaporation, and the causes of drought were found out. The results show that precipitation and annual evapotranspiration in North Henan Province are on the whole declining, and the trend of drought is increasing. Farmland drought is caused by the imbalance of atmospheric precipitation, but it is manifested in the imbalance of soil water. Regulating and controlling dry farming system, developing drought and drought Of agricultural technology measures, the selection of drought-resistant varieties, formulate water conservation policies that can effectively prevent drought.