西北黄土高原实行多熟种植开发夏闲地的气候可能性分析

An Analysis of Climatological Possibility for Developing Summer Fallow Lands in Practising Multiple Cropping System on the Loess Plateau in Northwest China

从热量和水分状况两方面广泛分析了西北黄土高原区实行多熟种植开发夏闲地的气候可能性。分析表明,西北黄土高原地区水热资源状况虽较严酷,但通过选用粮食、经济、饲草、绿肥和蔬菜等各种类型的作物和品种,组配各种作物组合,采用灵活多样的复种、套种和移栽等种植方式,在3900万亩夏闲地中有30％可以进行不同程度的开发利用(从三年四热到一年二熟),显著地提高农田光热水资源的利用率。整个西北黄土高原区水热复种指数潜力值可达136％。

As viewed from thermal and moisture conditions,this paper analyses theclimatological possibility for developing summer fallow lands to implement multiplecropping system in the loess plateau regions of Northwest China. The analytical resultsshow that although water and thermal resources are in serious conditions, 30% of 39million mu of summer fallow lands can be developed and utilized to some certain extentthrough the good matching and selection of various types of crops and varieties includingcrops,economic crops,forage crops,green manuring crops and vegetables and by adopt-ing various planting patterns such as multiple cropping,intercropping and transplanting.In this way,the use efficiency of light,thermal and water resources in farmlands can begreatly improved,and the multiple cropping index for water and thermal resources onthe loess plateau in Northwest China can reach 136%.