论文部分内容阅读
近年来省内各地旱情发展呈逐年上升趋势，以地处寒冷半干旱山区的涉县为例，自１９９９年１０月２１日到２０００年５月２５日降雨量只有３８．７mm（毫米），较常年同期降水１２１．１mm少８２．４mm，目前全县７０％的耕地处在极度干旱之中。根据县农业局调查，纯旱地山坡梯?
In recent years, the development of drought in various parts of the province has been increasing year by year. Taking the Shexian County located in the cold and semi-arid mountainous region as an example, the rainfall from October 21, 1999 to May 25, 2000 was only 38.7mm (millimeter) In the same year, precipitation is 121.1mm less 82.4mm, at present 70% of the county’s arable land is in extreme drought. According to the county Bureau of Agriculture survey, pure dry slopes?