LIU Yu-lan,CHEN Dian-yuan,YUAN Ming-hao,et al.Effects of Planting Density on Photosynthetic Capactity of Glycine gracilis[J].Soybean Science,2018,37(04):551-557.[doi:10.11861/j.issn.1000-9841.2018.04.0551]
种植密度对小粒大豆光合生产能力的影响
- Title:
- Effects of Planting Density on Photosynthetic Capactity of Glycine gracilis
- Keywords:
- Planting density; Glycine gracilis; Photosynthetic capactity; Yield
- 文献标志码:
- A
- 摘要:
- 以通农15为试验材料,采用田间小区试验,设置18(S1)、20(S2)、22(S3)、24(S4)和26(S5)万株·hm-2 5个密度,研究不同密度对小粒大豆光合生产能力的影响。结果表明:小粒大豆株高和倒伏率随着密度的增加呈上升趋势;单株根鲜重和根瘤菌数随着密度的增加呈先增加后降低趋势,S3处理根系鲜重、根瘤菌数均最大;在V4~R4期叶面积指数(LAI)随着密度的增加而增加,R6期随着密度的增加而降低;单株干物质积累、叶绿素含量(SPAD值)、单株粒数、单株荚数、百粒重均随着密度的增加呈下降趋势;净光合速率(Pn)、蒸腾速率(Tr)及气孔导度(Gs)各指标在V4~R6期均随着密度的增大呈降低的趋势,R7期呈增高趋势; S4处理净光合速率(Pn) 、蒸腾速率(Tr)与S1、S2、S3各处理指标值达极显著差异水平(P<0.01),气孔导度(Gs)达显著差异水平(P<0.05);胞间CO2浓度(Ci)随着密度的增加呈现增加趋势。本试验条件下,小粒大豆以22万株·hm-2(S3)产量最高,为2 908.99 kg·hm-2,比S1、S2、S4、S5处理分别增加7.5%、3.6%、9.9%、21.8%,与S2处理差异显著(P<0.05),与S1、S4、S5各处理差异极显著(P<0.01)。
- Abstract:
- This study investigated the effects of planting density on photosynthetic capacity of Glycine gracilis. A field experiment was conducted using a split-plot design under five planting densities (18×104 plants·ha-1,S1; 20×104 plants·ha-1, S2; 22×104 plants·ha-1,S3; 24×104 plants·ha-1, S4; 26×104 plants·ha-1, S5) with Tongnong 15 as material. The result showed that the plant height and lodging rate showed a gradually rising trend along with the density increasing. Fresh weight of root and the amount of root nodules per plant showed a firstly increasing and then decreasing trend with the density increasing, they reached the maximum with S3 treatment. Leaf area index (LAI)were improved along with the density increasing during the period from V4 to R4,while decreased with the density increasing at R6 period.Dry matter, SPAD, seeds number, effective pods per plant and 100-seed weight showed a gradually reduced trend with the increasing density .The net photosynthetic rate (Pn),transpiration rate (Tr) and stomatal conductance (Gs) were decreased with the increasing density in the V4-R6 period,but they were improved with the density increasing in the R7 period.The differences in the net photosynthetic rate (Pn) and transpiration rate (Tr) between S4 and S1,S2,S3 treatments were extremely significant (P<0.01),the differences in the stomatal conductance (Gs) was significant (P<0.05). Intercellular CO2 concentration (Ci) was increased with the density increasing.Treatment S3 had the highest yield of 2 908.99 kg·ha-1 ,which was 7.5%, 3.6%, 9.9% and 21.8% more than S1,S2,S4 and S5 treatments, respectively. The difference in the yield between S3 and S2 was significant (P<0.05),and the differences between S3 and S1, S4, S5 treatments were extremely significant (P<0.01).The results could provide scientific and reasonable theory basis for the production practice of the plant population of Glycine gracilis.
参考文献/References:
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备注/Memo
收稿日期:2018-01-10