不同类型降解膜覆盖对玉米干物质积累、分配和转运及产量的影响
李保成 , 白梓辰 , 秦书勉 , 刘丹 , 韩云飞 , 张乐 , 杜二小 , 高宏艳 , 张向前 , 王伟妮 , 任永峰
中国农业大学学报 ›› 2026, Vol. 31 ›› Issue (1) : 21 -34.
不同类型降解膜覆盖对玉米干物质积累、分配和转运及产量的影响
Effects of different types of degradable film mulching on the accumulation, allocation and translocation of dry matter, and yield of maize
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为探究覆盖不同类型生物可降解地膜对玉米干物质积累、分配和转运及产量的影响,于2023—2024年在内蒙古自治区达拉特旗东海心村,设置聚乙烯地膜(PE)、快速生物降解膜(M1)、慢速生物降解膜(M2)和中速生物降解膜(M3)4种覆膜处理,以无覆膜处理作为对照(CK),测定土壤含水率及玉米茎、叶、苞叶、穗的干物质积累量和产量等指标,并解析不同处理下玉米干物质积累分配转运特征。结果表明:与CK相比,4种覆膜处理均可显著提高0—40 cm土壤含水量(P<0.05)。M3的玉米籽粒产量最高,2023和2024年其产量分别为15 302.35和15 509.71 kg/hm2,分别较PE、M1、M2和CK处理增产6.22%~6.57%、12.37%~12.54%、2.58%~3.72%和20.22%~23.46%。M3可显著提高灌浆-成熟期玉米地上部干物质积累量,其干物质积累量分别较M1、M2和PE处理高出14.56%~30.79%、6.22%~11.18%和7.25%~23.46%。经Logistic模型拟合显示,M3的干物质增长速率(v)最大,分别较CK、M1、M2和PE高20.67%、12.45%、6.39%和3.15%。随玉米生育进程推进,叶的干物质占比呈逐渐降低趋势;茎的干物质占比呈单峰曲线变化,峰值出现在大喇叭口期;而穗的干物质占比则持续递增,成熟期达到最大值,其中M3的穗部干物质占比最高,分别比 M1、M2、PE和CK高出17.74%、6.61%、10.39%和20.62%。M3的干物质转运表现最优,在花前阶段其营养器官干物质转运量(DMR)、营养器官干物质转运率(DMRE)和营养器官干物质积累对籽粒干物质积累贡献率(DMRCG)较PE分别升高24.76%、19.53%和31.02%(P<0.05);花后阶段,M3的DMA最大,分别比M2和PE高11.56%和28.92%。综上,覆盖中速生物降解膜处理(M3)可通过提高玉米地上部干物质最大积累速率,增加玉米干物质积累量,提升花前干物质积累量对籽粒的贡献率和花后干物质积累量,进而增大穗部干物质分配比例,最终实现玉米籽粒产量的提高。
To explore the effects of different types biodegradable film mulching on dry matter’s accumulation, distribution and transport, and yield of maize, in Donghai Xin Village, Dalat Banner, Inner Mongolia Autonomous Region. From 2023 to 2024, four mulching treatments, polyethylene mulch film (PE), rapid biodegradable film (M1), slow biodegradable film (M2) and medium-speed biodegradable film (M3) with no mulching treatment as a control (CK) were set in Donghai Xin Village, Dalat Banner, Inner Mongolia Autonomous Region. Soil moisture content, dry matter accumulation and yield of maize stems, leaves, bracts and ears were measured, and the dry matter accumulation and distribution and transport characteristics of maize under different treatments were analyzed. The results showed that: Compared with CK, the soil moisture content of 0-40 cm was significantly increased by both the biodegradable film and the polyethylene film treatment(P<0.05). The yield of maize in M3 treatment was the highest, with the yield of 15 302.35 and 15 509.71 kg/hm2 in 2023 and 2024, respectively, compared with PE, M1, M2 and CK treatments, the yield increased by 6.22% ‑ 6.57%, 12.37% ‑ 12.54%, 2.58% ‑ 3.72% and 20.22% ‑ 23.46%, respectively. M3 treatment could effectively increase the dry matter accumulation of aboveground maize from the grain filling stage to maturity stage, and its dry matter accumulation was 14.56%-30.79%, 6.22%-11.18% and 7.25%-23.46% higher than that of M1, M2 and PE treatments, respectively. The Logistic model fitting showed that the dry matter growth rate (v) of M3 treatment was the largest, which was 20.67%, 12.45%, 6.39% and 3.15% higher than that of CK, M1, M2 and PE, respectively. The dry matter allocation in the aboveground part of maize was specific to the growth period, and the proportion of leaves gradually decreased. The proportion of stem allocation changed in a unimodal curve, and the peak appeared in the large trumpet stage. The proportion of dry matter in the ear continued to increase, reaching the maximum value at the maturation stage, and the proportion of dry matter in the ear of M3 was the highest, which was 17.74%, 6.61%, 10.39% and 20.62% higher than that of M1, M2, PE and CK, respectively. The dry matter transport performance of M3 treatment was the best, at the pre-flowering stage, the dry matter transport (DMR), dry matter transport rate (DMRE) of pre-flowering vegetative organs and the contribution rate of dry matter accumulation (DMRCG) of pre-flowering vegetative organs to grain dry matter accumulation (DMRCG) increased by 24.76%, 19.53% and 31.02%, compared with PE treatment (P<0.05), respectively. The dry matter accumulation (DMA) of M3 at the post-flowering stage was the largest, which was 11.56% and 28.92% higher than that of M2 and PE treatments, respectively. In conclusion, medium-speed biodegradable film treatment (M3) increased the maximum dry matter accumulation rate of maize aboveground, increased the dry matter accumulation rate of maize, increased the contribution rate of dry matter accumulation before flowering to grain and dry matter accumulation after flowering, and then increased the dry matter allocation ratio of ears, and finally achieved the increase of maize grain yield.
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鄂尔多斯市“揭榜挂帅”项目(JBGS-2021)
内蒙古自治区科技计划(2023SKYPT0045)
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