Abstract 【Objective】This study aimed to explore the change of the above-ground canopy structure and function together with increasing planting density of maize in China, so as to provide a theoretical basis for reasonable density in maize production.【Method】In this paper, a total of 82 publicly published academic articles were collected, and a total of 1 338 sets of yield-density data were obtained, including 1 200 sets of maximum leaf area index (LAImax) -density data, and 475 sets of maximum leaf photosynthesis rate (Pnmax) -density data. According to the date of sowing, the total samples were divided into two groups: spring and summer maize. Comprehensive analysis of the relationship between maize yield, planting density and photosynthetic characteristics was carried out by using boundary line analysis and various curve fitting methods. 【Result】(1) The agronomic planting density in China was 100 000 plants/hm2 for a maximum yield of 11.5 t·hm-2. Although the optimal planting density of spring and summer maize was similar, the grain yield of spring maize was 13.0% higher than summer maize. (2) When the planting density reached 110 000 plants/hm2, LAImax no longer increased with planting density increasing. When LAImax reached 6.4, the highest yield could be obtained. The platform value of LAImax for spring maize was 17.6% higher than that for summer maize. The logarithmic function was used to analyze the relationship between LAImax and density, as well as Pnmax and LAImax, and the results showed Pnmax decreased with increasing density and LAImax. (3) Grain yield, LAImax and Pnmax were all significantly improved through analyzing the data of different varieties in recent decades. 【Conclusion】Increasing planting density was one of important ways to increase maize yield. When the density was out the rational range, the photosynthetic characteristics of leaf was altered, which limited yield improvement. Comprehensive analysis of quantitative relationships among maize yield, planting density, and photosynthetic characteristics of ear leaf was important to guide high-yield and high-efficiency maize system with high density. Keywords:maize;planting density;grain yield;leaf area index;net photosynthetic rate
PDF (1419KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 侯佳敏, 罗宁, 王溯, 孟庆锋, 王璞. 增密对我国玉米产量-叶面积指数-光合速率的影响[J]. 中国农业科学, 2021, 54(12): 2538-2546 doi:10.3864/j.issn.0578-1752.2021.12.005 HOU JiaMin, LUO Ning, WANG Su, MENG QingFeng, WANG Pu. Effects of Increasing Planting Density on Grain Yield, Leaf Area Index and Photosynthetic Rate of Maize in China[J]. Scientia Acricultura Sinica, 2021, 54(12): 2538-2546 doi:10.3864/j.issn.0578-1752.2021.12.005
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