农学学报2024，Vol.14Issue(8)：16-23,8.
烤烟光氮空间分布、光合特性及干物质积累对增密的响应
Responses of Light Energy and Nitrogen Spatial Distribution,Photosynthetic Characteristics and Dry Matter Accumulation to Increased Planting Density of Flue-cured Tobacco
摘要
Abstract
To explore the effects of densification on the distribution of light andnitrogen,photosynthetic characteristics,dry matter accumulation and output value of flue-cured tobacco canopy in Shaoguan tobacco-growing area,four densities(M1:10500 plants/hm2,M2:13500 plants/hm2,M3:16500 plants/hm2,M4:19500 plants/hm2)of'Yueyan 97'were set to determine the light resources and nitrogen distribution,pigment content,dry matter accumulation and economic properties of different canopy.The results showed that with the increase of density,the light transmittal rate of different canopy decreased and the chlorophyll content was increased.Compared with M1 treatment,the upper leaf chlorophyll of M4 treatment increased by 26.31%at 80d,and the increase of Chlb was greater than that of Chla.Photosynthetic characteristics and nitrogen are important indexes of crop carbon and nitrogen metabolism.As density increased,photosynthetic rate of tobacco plant decreased,compared with M1 treatment,the upper leaves of M4 treatment decreased by 32.16%to 35.83%.The Ci,Tr and Gs increased first and then decreased,while nitrogen concentration showed a decreasing trend,but there was no significant difference between middle and upper leaves of M4,M3 and M2 treatment at different periods.When the density was 16500 plants/hm2,the dry matter accumulation in leaf organs of'Yueyan 97'reached the maximum,and the highest yield and economic benefit were obtained.Compared with the density of 10500 plants/hm2,the yield and output value were significantly increased.Reasonable dense planting of'Yueyan 97'could resist the decline of photosynthetic rate under weak light stress by reducing chlorophyll degradation and improving nitrogen distribution in middle and upper leaves,promoted the dry matter accumulation ability of tobacco plant population,and obtained higher tobacco yield and output value.关键词
烤烟/种植密度/光合特性/干物质/光氮分布Key words
flue-cured tobacco/planting density/photosynthetic characteristics/dry matter/light energy and nitrogen spatial distribution分类
农业科技引用本文复制引用
宗钊辉,王寒,李谨诚,赵伟才,邓文君,王维,余纯强,王军..烤烟光氮空间分布、光合特性及干物质积累对增密的响应[J].农学学报,2024,14(8):16-23,8.基金项目
广东中烟科技项目"韶关烟区烤烟烟碱含量偏低的原因分析及其调控措施研究"(20214400003400007). （20214400003400007）
