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| 密度对不同株高油菜冠层结构与群体光合能力的影响 | |
| 引用本文： | 李虹桥,赖莹,母娜,严红梅,汤维群,蒋小灵,高雯,吴永成.密度对不同株高油菜冠层结构与群体光合能力的影响[J].浙江农业学报,2022,34(3):419-427. |
| 作者姓名： | 李虹桥 赖莹 母娜 严红梅 汤维群 蒋小灵 高雯 吴永成 |
| 作者单位： | 1.四川农业大学 农学院,四川 成都 6111302.农业农村部西南作物生理生态与耕作重点实验室,四川 成都 6111303.作物生理生态及栽培四川省重点实验室,四川 成都 611130 |
| 基金项目： | 四川省农作物育种攻关栽培课题(2021YFYZ0005);国家现代农业产业技术体系四川油菜创新团队(sccxtd2021-03) |
| 摘 要： | 为明确甘蓝型油菜迟直播条件下不同种植密度的冠层结构与群体光合能力特征,采用两因素裂区试验设计,以不同种植密度(15万、30万、60万株·hm-2,分别用D1、D2、D3表示)为主因素,不同油菜品种(半矮秆油菜JS-1、高秆油菜川油36,分别用V1和V2表示)为副因素,在大田试验条件下测定植株群体的叶面积指数(LAI)、... |
| 关 键 词： | 油菜 光环境 冠层结构 群体光合能力 株高 密度 |
| 收稿时间： | 2021-06-11 |
Effect of plant density on canopy structure and population photosynthetic capacity of rapeseed with different plant heights |
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| LI Hongqiao,LAI Ying,MU Na,YAN Hongmei,TANG Weiqun,JIANG Xiaoling,GAO Wen,WU Yongcheng.Effect of plant density on canopy structure and population photosynthetic capacity of rapeseed with different plant heights[J].Acta Agriculturae Zhejiangensis,2022,34(3):419-427. | |
| Authors: | LI Hongqiao LAI Ying MU Na YAN Hongmei TANG Weiqun JIANG Xiaoling GAO Wen WU Yongcheng |
| Institution: | 1. College of Agronomy, Sichuan Agricultural University, Chengdu 611130, China 2. Key Laboratory of Crop Physiology,Ecology and Cultivation in Southwest China, Ministry of Agriculture and Rural Affairs, Chengdu 611130, China 3. Crop Ecophysiology and Cultivation Key Laboratory of Sichuan Province, Chengdu 611130, China |
| Abstract: | To explore the characteristics of canopy structure and population photosynthetic capacity of Brassica napus with different planting densities under the late direct sowing. A two-factor split plot design was adopted, under the rice-rapeseed rotation system in the Chengdu Plain, with different planting densities (150 000 plants·hm-2, 300 000 plants·hm-2, 600 000 plants·hm-2 expressed as D1, D2, and D3, respectively) as the main factor, and different rapeseed varieties (semi-dwarf rapeseed Jiayou JS-1 and high-stalk rapeseed Chuanyou 36, represented by V1 and V2, respectively) were secondary factors.Leaf area index (LAI), pod area index (PAI), light transmittance, population photosynthetic rate, biomass and grain yield of the plant population under the field experiment were measured. The results showed that during the flowering period, LAI of V1 increased first and then decreased with the increase of planting density, and LAI of V2 increased with the increase of density;During grain grouting stage, PAI increased significantly with the increase of planting density. During the flowering stage, with the increase of planting density, transmittance of V1 did not change significantly, while the transmittance of V2 showed a decreasing trend; The increase of planting density at grain grouting stage resulted in a significant decrease in the transmittance between the rows of V1 and V2. And transmittance of V1was significantly higher than that of V2 under the same density.The population photosynthetic rate (photosynthetic rate of all rapeseed plants per unit area) of V1D3 in the flowering period was 43.42 μmol·m-2·s-1, which increased by 27.33% and 9.72% compared to D1 and D2; The population photosynthetic rate of V1D3 in the grouting period was 28.24 μmol·m-2·s-1, increased by 37.55% and 7.05%compared with D1 and D2. Population photosynthetic rate was V1>V2 and the differences were significant under higher planting density (D2, D3).In conclusion, increasing planting density stimulated the population photosynthetic area index of late direct seeding rapeseed, which was beneficial to the construction of good canopy structure, and enhanced population photosynthetic rate and grain yield of rapeseed. Compared with high-stalk rapeseed (average 2 365.48 kg·hm-2), semi-dwarf rapeseed had higher population light transmittance and population photosynthetic rate, and higher harvest index under the late direct seeding and high density, which resulted in higher grain yield (average 3 057.32 kg·hm-2). |
| Keywords: | rapeseed light environment canopy structure population photosynthetic capacity plant height density |
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