辽宁农业科学Issue(1)：5-11,7.DOI:10.3969/j.issn.1002-1728.2025.01.002
清种与混播对不同株型玉米根系竞争区域土壤温室气体排放与产量的影响
Effects of Single and Mixed Seeding on Soil Greenhouse Gas Emission and Yield in Different Areas of Root Competition in Different Plant-type Corn Hybrid at High Planting Density
摘要
Abstract
Two-factor random block design was adopted under field conditions,the main block was divided in-to two seeding methods:one was single seeding flat-type corn named Nongda 108(SP1)and compact-type corn named Zhengdan 958(SP2),the other one was two hybrids according to 1∶1 Mixed seeding(MP),the sub plot was two different areas of root competition,named root overlapping zone(CD)and non-overlap-ping zone(CK)in 0～20 cm soil layer.Under the planting density of 90 000 plants/hm2,soil temperature and humidity,total nitrogen content,greenhouse gas and yield were measured dynamically.The results showed that the soil temperature and soil moisture under MP treatment were 2.9%higher and 3.1%lower than SP2 treatment during the whole growth period.The soil moisture in CK region was 18.3%higher than that in CD region.Compared with other seeding methods,the soil total nitrogen content under SP2 treatment was sig-nificantly increased by 8.5%compared with MP treatment.The N2 O and CO2 emissions of different treatments in the whole growth period were all in the order of SP2 treatment>SP1 treatment>MP treatment,which N2 O and CO2 emissions in CD region decreased by 7.3%and 5.9%respectively compared with CK region.The kernel weight,harvest index and yield of SP2 treatment were higher than those of other treatments,and the yield difference between SP2 treatment and other treatments reached a significant or extremely significant lev-el.In conclusion,the compact-type corn hybrid with mono seeding could obtain higher yields than the flat-type corn hybrid with mono seeding and the two hybrids with 1∶1 mixed seeding at high planting density.Meanwhile,the total nitrogen content of the soil near the root competition area was relatively higher,the soil moisture difference between the root overlapping area and the non-overlapping area was larger,and the green-house gas emissions were relatively higher.关键词
播种方式/春玉米/株型/增密种植/根系重叠区/温室气体/产量Key words
Seeding method/Spring corn/Plant-type/High planting density/Root overlapping area/Green-house gases/Yield分类
农业科技引用本文复制引用
张书萍,赵海岩,刘晶,肖万欣..清种与混播对不同株型玉米根系竞争区域土壤温室气体排放与产量的影响[J].辽宁农业科学,2025,(1):5-11,7.基金项目
国家重点研发计划项目(2023YFD2303302) （2023YFD2303302）
辽宁省科技特派行动专项计划项目(2024JH5/10400010) （2024JH5/10400010）
