玛曲草原气候资源利用与牧草生产力的研究  

Analysis on Climate Resource Utilization and Pasture's Productivity in Maqu Grassland

作　　者：李国军 张胜智 吉哲君 宁和平 

机构地区：[1]甘肃省甘南藏族自治州气象局,甘肃合作747000

出　　处：《干旱气象》2009年第3期276-281,共6页Journal of Arid Meteorology

摘　　要：用3阶多项式生长曲线数学模型拟合牧草产量各状况年的牧草生产力，与实际值吻合较好。模拟结果表明，最大生长率70．2kg／hm^2·小生长率1．6kg／hm^2·d；月最大产量2042．5kg／hm^2，月最小产量57．6kg／hm^2。生长季5～9月，旬t〉0qC的累积积温每增加1℃，最高状况年比最低状况年每旬增加干物重2．54kg／hm^2；旬累积降水量每增加1mm，最高状况年比最低状况年每旬增加干物重7．33kg／hm^2；旬累积日照时数每增加1h，最高状况年比最低状况年每旬增加干物重3．83kg／hm^2。考虑到倾向率变化的不同，旬累积降水量引起的产量变化是主要原因，旬累积积温次之，旬累积日照时数影响弱。高产年气候资源利用率高，低产年气候资源利用率低。The pasture＇ s productivity simulated by the third -order polynomial growth curve mathematical model in different years in Maqu grassland coincided with the actual value. The simulation results show that the maximum growth rate is 70.2 kg/hm^2· d and the minimum is 1.6 kg/hm^2·d. The monthly maximum yield is 2 042.5 kg/hm^2 and the minimum is 57.6 kg/hm^2. From May to Septem- ber, the 10 days accumulated temperature which is above 0 ℃ increased 1 ℃, the pasture＇ s dry matter increased 2.54 kg/hm^2, and the amount of the precipitation increased every 1 mm in every 10 days, the dry matter increased 7.33 kg/hm^2 , as well as the sunshine duration increased every one hour in every 10 days, the dry matter increased 3.83 kg/hm^2. Considering the difference of the climate tendency for different factors, the ten days precipitation is the main factor which influences the pasture＇ s yield, and the accumulated temperature in every 10 days plays the second role. The climate resources utilization rate in high production year is higher than that in the low production year.

关 键 词：玛曲草原 气候资源利用 牧草生产力 生长数学模型 

分 类 号：S162.5[农业科学—农业气象学]