| 刘明春,兰晓波,魏育国,刘惠兰,蒋菊芳,马兴祥,尹东.石羊河流域春秋不同播期人工牧草气候生产力分析[J].干旱地区农业研究,2008,(6):179~185 |
| 石羊河流域春秋不同播期人工牧草气候生产力分析 |
| Climate-productivity analysis of artificial grass in different sowing time in arid area of Shiyang River basin |
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| DOI：10.7606/j.issn.1000-7601.2008.06.35 |
| 中文关键词: 人工牧草 分期播种 气候生产力 |
| 英文关键词:artificial grass sowing seeds by stages climate-productivity |
| 基金项目:兰州区域气象中心开放实验室项目(Lab2002-4)； 中国气象局“西北区域干旱监测预警评估业务系统”课题 |
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| 中文摘要: |
| 2003～2005年对石羊河流域春秋两种播期人工牧草紫花苜蓿(Medicago sative)、沙打旺(Astragalus adsurgens)的生育期,地上、地下生物量,产量等进行了连续测定。结果表明:(1)紫花苜蓿、沙打旺生长第二年(2004年)干物重春播地均高于秋播地。分别增产3 505.0 kg/hm2、2 314.5 kg/hm2。(2)春播和秋播地牧草干物质积累增长关键期均出现在现蕾～开花期。此期紫花苜蓿、沙打旺干物质积累量分别占累积总量的70%和63%。(3)生长第二年(2004年)春播和秋播地青干比最小值出现在开花期,也是牧草刈割的最佳期。(4)春播牧草地下生物量高于秋播。春播紫花苜蓿、沙打旺根干重分别比秋播高2.5～2.6倍和0.5～1.0倍,春播有利于牧草根系生长。(5)春季日平均气温稳定通过5℃为牧草适宜返青温度。在灌溉条件下,牧草干重与热量因子呈显著正相关,生产力高低主要取决于热量的多寡,秋播地和晚熟品种对热量条件的需求更高。 |
| 英文摘要: |
| In order to reduce the pressure of water resources in the basin adjustment and optimized agriculture planting structure development grass livestock industry after two years＇ sowing seeds by stages experiment growth and development characteristics yield forming laws and adaptability to climate of the two kinds of grass Medicago sative and Astragalus adsurgens under the condition of artificial planting were determined. The result indicated：（1） The dry matter weight of Medicago sative and Astragalus adsurgens of the second year（2004） in the spring sowing land was higher than in the autumn sowing land increasing the yield by 3505．0kg and 2314．5kg per hm2respectively．（2） The increase of grass dry weight and plant height sowed in spring and in autumn was basically isochronous and the growth key time all appeared in budding and flowering period．In this period dry matter accumulation quantity of Medicago sative and Astragalus adsurgens was respectively 70％ and63％ of the total．（3） The least value which was showed by the ratio between dryness and blueness of two kinds of grass growing on the second year （2004） in spring sowing land and autumn sowing land appeared in flowering period which was also the best time to reap pasture．（4） The grass underground biomass in spring sowing land was better than in autumn sowing land．The grass in spring sowing land was helpful for root system to grow．（5） It was the fitting temperature for pasture to return green that means daily temperature steadily passed5℃ in spring．Under the condition of irrigation pasture dry weight was positively associated with heat factor and the productivity was mainly dependent on heat and the requirement of autumn sowing land and late maturing variety for heat condition was more urgent. |
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