中国北方地区牧草气候生产力及主要限制因子

Climatic productivity of forage grass and its restricting factors in north region of China.

计算了我国北方地区牧草的气候生产力,并分析了影响气候生产力的主要气候因子。结果表明,我国北方地区牧草气候生产力的分布趋势由东向西、由南向北逐渐降低,最低值<2000kg/hm^2,而最高值>3万kg/hm^2,最高值与最低值间相差15倍以上。指出影响牧草生长的主要气候因子是干旱,人工牧场有广阔的发展前景;在退耕还林过程中必须将退耕退出的水资源返还到牧业(林业)中去,以保证牧业(林业)生产的持续、高效、稳定发展。

The climatic productivity of forage grass is calculated and the main restricting factors of impacting the climatic productivity are analyzed in north region of China. The results show that the distribution tendency is decreasing gradually from east to west and from south to north. The lowest value is smaller than 2000kg/hm2 , but the highest value is higher than 30000kg/hm2. The difference between the highest and the lowest is more than 15 times. Drought is the main climatic factor to influence the forage grass growth. So, developing artificial pastureland has a good prospect. In the cropland shifting for tree planting, we have to put the water resource from cropland shifting into stock-raising (forest) to guarantee stock-raising (forest) production to be sustainable, high effective and stably developed.