Effect of plant density on canopy structure and population photosynthetic capacity of rapeseed with different plant heights

doi:10.3969/j.issn.1004-1524.2022.03.01

Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (3): 419-427.DOI: 10.3969/j.issn.1004-1524.2022.03.01

• Crop Science • Previous Articles Next Articles

Effect of plant density on canopy structure and population photosynthetic capacity of rapeseed with different plant heights

LI Hongqiao¹(), LAI Ying¹, MU Na¹, YAN Hongmei¹, TANG Weiqun¹, JIANG Xiaoling¹, GAO Wen¹, WU Yongcheng¹^,²^,³^,^*()

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

Received:2021-06-11 Online:2022-03-25 Published:2022-03-30
Contact: WU Yongcheng

Abstract

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).

Key words: rapeseed, light environment, canopy structure, population photosynthetic capacity, plant height, density

CLC Number:

S565.4

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.

Figures/Tables 4

References 43

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密度 Density	品种 Variety	开花期Flowering period		灌浆期Grouting stage
密度 Density	品种 Variety	绿叶数 Number of green leaves	叶面积指数 Leaf area index	角果皮面积指数 Pod area index	角果层厚度 Pod layer thickness/cm
D₁	V₁	20.15±2.49 bc	4.68±0.31 d	5.88±0.71 c	131.67±4.47 a
D₂	V₁	19.29±2.31 cd	7.19±0.23 a	5.95±0.52 bc	94.44±11.54 d
D₃	V₁	17.11±1.15 d	6.55±0.31 ab	6.35±0.91 b	91.67±11.69 d
D₁	V₂	23.08±4.19 a	5.69±0.54 c	4.51±0.63 d	117.06±15.40 b
D₂	V₂	22.40±2.13 ab	6.37±0.18 bc	7.43±0.63 a	110.67±15.40 bc
D₃	V₂	19.76±2.70 bc	6.67±0.50 ab	7.84±0.72 a	107.39±11.04 c

密度 Density	品种 Variety	开花期Flowering period		灌浆期Grouting stage
密度 Density	品种 Variety	绿叶数 Number of green leaves	叶面积指数 Leaf area index	角果皮面积指数 Pod area index	角果层厚度 Pod layer thickness/cm
D₁	V₁	20.15±2.49 bc	4.68±0.31 d	5.88±0.71 c	131.67±4.47 a
D₂	V₁	19.29±2.31 cd	7.19±0.23 a	5.95±0.52 bc	94.44±11.54 d
D₃	V₁	17.11±1.15 d	6.55±0.31 ab	6.35±0.91 b	91.67±11.69 d
D₁	V₂	23.08±4.19 a	5.69±0.54 c	4.51±0.63 d	117.06±15.40 b
D₂	V₂	22.40±2.13 ab	6.37±0.18 bc	7.43±0.63 a	110.67±15.40 bc
D₃	V₂	19.76±2.70 bc	6.67±0.50 ab	7.84±0.72 a	107.39±11.04 c

种植密度 Density	品种 Variety	开花期Flowering stage		灌浆期Grouting stage
种植密度 Density	品种 Variety	群体光合速率 Group photosynthetic rate	群体呼吸速率 Group respiration rate	群体光合速率 Group photosynthetic rate	群体呼吸速率 Group respiration rate
D₁	V₁	34.10±5.80 d	22.79±3.24 abc	20.53±6.89 d	6.25±1.35 c
D₂	V₁	39.57±9.23 b	24.77±3.45 ab	26.38±8.35 b	7.90±2.09 b
D₃	V₁	43.42±7.73 a	26.10±6.91 a	28.24±5.43 a	8.77±2.60 a
D₁	V₂	30.81±7.17 e	17.41±3.85 d	21.29±4.78 d	4.24±0.54 d
D₂	V₂	36.10±8.00 c	18.80±3.54 cd	24.14±7.86 c	4.87±1.37 d
D₃	V₂	36.86±4.84 c	21.02±5.40 bcd	27.42±5.43 ab	6.27±1.71 c

种植密度 Density	品种 Variety	开花期Flowering stage		灌浆期Grouting stage
种植密度 Density	品种 Variety	群体光合速率 Group photosynthetic rate	群体呼吸速率 Group respiration rate	群体光合速率 Group photosynthetic rate	群体呼吸速率 Group respiration rate
D₁	V₁	34.10±5.80 d	22.79±3.24 abc	20.53±6.89 d	6.25±1.35 c
D₂	V₁	39.57±9.23 b	24.77±3.45 ab	26.38±8.35 b	7.90±2.09 b
D₃	V₁	43.42±7.73 a	26.10±6.91 a	28.24±5.43 a	8.77±2.60 a
D₁	V₂	30.81±7.17 e	17.41±3.85 d	21.29±4.78 d	4.24±0.54 d
D₂	V₂	36.10±8.00 c	18.80±3.54 cd	24.14±7.86 c	4.87±1.37 d
D₃	V₂	36.86±4.84 c	21.02±5.40 bcd	27.42±5.43 ab	6.27±1.71 c

种植密度 Density	品种 Variety	植株总干重 Plant dry weight/(kg·hm^-2)	籽粒产量 Grain yield/(kg·hm^-2)	收获指数 Harvest index
D₁	V₁	9 047.38±398.02 e	2 896.52±133.12 b	0.32±0.014 a
D₂	V₁	19 522.77±799.03 b	2 951.77±267.10 b	0.27±0.011 b
D₃	V₁	20 355.52±259.81 b	3 323.67±144.63 a	0.23±0.003 c
D₁	V₂	12 340.40±599.90 d	1 953.68±259.60 d	0.16±0.008 d
D₂	V₂	18 117.43±1 182.43 c	2 326.99±136.31 c	0.12±0.008 e
D₃	V₂	22 429.56±629.74 a	2 815.77±266.08 b	0.13±0.004 e

Effect of plant density on canopy structure and population photosynthetic capacity of rapeseed with different plant heights

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[1]	FENG Wei, LI Pengpeng, SONG Peng. Heterologous expression and physicochemical characterization of Brassica napus Kunitz protease inhibitor [J]. Acta Agriculturae Zhejiangensis, 2022, 34(1): 112-119.
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[7]	PAN Junfeng, ZHONG Xuhua, HUANG Nongrong, LIU Yanzhuo, TIAN Ka, LIANG Kaiming, PENG Bilin, FU Youqiang, HU Xiangyu. Effects of different cultivation patterns on grain yield and nitrogen use efficiency of rice in South China [J]. , 2019, 31(6): 857-868.
[8]	QIU Lefeng, YU Zhoulu. Land use changes induced soil organic carbon stock variations in cropland soils in Fuyang District, Hangzhou City in 1979-2020 [J]. , 2019, 31(2): 291-296.
[9]	LI Hongqiao, DUAN Qiuyu, LIU Shishan, YANG Yunfei, LI Mengying, WU Yongcheng. Comparative study of yield and nitrogen efficiency between dwarf variety and normal variety in oilseed rape (Brassica napus L.) [J]. , 2019, 31(11): 1796-1802.
[10]	WANG Feng, SHEN Jianghua, SUN Meimei, CHAI Weigang, YAO Hongyan, DAI Yaolu, ZHANG Yuping, ZHU Defeng, CHEN Ruoxia. Effect of change of plant height on nitrogen use efficiency in Yongyou indica-japonica hybrid rice [J]. , 2019, 31(1): 1-10.
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