摘要
利用4月份降水量与牧草返青期的关系分析干旱对牧草返青期的影响。研究表明,内蒙古草地牧草返青期与4月份降水量呈显著负相关;在荒漠草原,当4月份降水量减少30%～50%时,牧草返青期将推迟5～15d;在典型草原和草甸草原,当4月份降水量减少50%以上时,牧草返青期才受降水偏少的影响,推迟10d左右。建立了干旱等级与补饲、人畜饮水成本损失的对应关系,实现了干旱对草地返青期直接经济损失的定量评估,评估模型符合草地牧草生长规律和畜牧业生产特征,实例评估符合畜牧业实际损失程度,因此,能够在干旱对草地畜牧业影响评估服务中推广应用。
Taking the relationship between April precipitation and grass turning green time into consideration, direct loss assessment caused by the drought on the grass turning green was studied. The results showed that grass turning green and April precipitation were negatively correlated, and the correlation coefficient was -0. 185. If April precipitation reduced by 30% to 50%, grass turning green time will be delayed 5 to 15 days in the desert steppe. When April precipitation reduced over 50%, grass turning green time will be delayed 10 days in the typical steppe and meadow steppe. Correspondence of drought grade and cost of the loss between the feeding and drinking water was established, along with the fulfillment of quantitative assessment of direct economic losses of drought on the grass turning green. The assessment model is in line with the regularity of grass pasture growth and livestock production characteristics, a case assessment may reflect livestock actual loss extent. This model is able to apply on assessing influence of drought on the grassland animal husbandry service.
出处
《草业科学》
CAS
CSCD
北大核心
2013年第3期452-456,共5页
Pratacultural Science
基金
国家科技部农业科技成果转化资金项目"北方主要牧区草原干旱诊断评估技术推广应用"(2010GB24160646)
关键词
干旱
草地类型
直接经济损失
drought
grassland type
direct economic loss
