草业科学2017，Vol.34Issue(4)：761-771,11.DOI:10.11829/j.issn.1001-0629.2016-0364
播种量对高寒牧区林纳燕麦生产性能及光合特性的影响
Effect of seeding rate on production performance and photosynthetic characteristics of Avena sativa cv.LENA in alpine pastoral regions
摘要
Abstract
Seeding rate is an important factor to guarantee high yield and quality of forage grass.Besides the biological characteristics of the forage grass,the reasonable seeding rate may also be affected by external conditions.In order to determine the optimum seeding rate in northwest alpine pastoral regions of Sichuan,Avena sativa cv.LENA was chosen as the material to explore the effects of six seeding rates (A:120 kg · ha-1,B:165 kg· ha-1,C:210 kg· ha-1,D:255 kg · ha-1,E:300 kg · ha-1,and F:345 kg · ha-1) on production performance and photosynthetic characteristics.Phenophase of A.sativa cv.LENA decreased with increasing seeding rates,and at the seedling stage,there was no significant difference,but at other stages,the differences were obvious.For plant height,there were no significant differences among the six seeding rates.The thickness of stems decreased significantly with the increasing seeding rates,and the tendency was more obvious at the latter stages.The stem-to-leaf ratio showed no significant differences between different seeding rates (P ＞0.05),but the ratio decreased significantly with the growth stages (P＜0.05).The fresh and dry hay yield increased significantly with the growth stages,and the largest dry hay yield was at E and F seeding rates.At the flowering stage,the stoma was more active at the A,B,and C seeding rates,and the intercellular CO2 concentration was lower at E and F seedling rate.Under the conditions of 30 cm row spacing and 300 kg · ha-1 or 345 kg · ha-1 seeding rate,A.sativa cv.LENA production performance and photosynthetic characteristics were ideal.These results provide theoretical support for A.sativa cv.LENA cultivation practices in northwest alpine pastoral regions of Sichuan to attain higher yields.关键词
川西北牧区/燕麦/播种量/生产性能/光合特性/草产量Key words
Northwest Sichuan pastoral regions/Avena sativa/seeding rate/production characteristics/photosynthetic characteristics/hay yield分类
农业科技引用本文复制引用
肖雪君,周青平,陈有军,杜忠,柏晓玲,田莉华,彭先琴..播种量对高寒牧区林纳燕麦生产性能及光合特性的影响[J].草业科学,2017,34(4):761-771,11.基金项目
“科技援青”高寒典型沙化综合治理技术集成与示范(2015SZ0062) （2015SZ0062）
川西北藏区沙化土地生态修复技术研究及示范(2015BAC05B01) （2015BAC05B01）
