Spatiotemporal variation of common ragweed soil seed bank density in cornfields
Spatiotemporal variation of common ragweed soil seed bank density in cornfields
复制标题
DOI：
10.1002/agj2.20487
复制
发表时间：
2021-01-21
期刊：
影响因子：
2.1
通讯作者：
Song, Zhanli
中科院分区：
文献类型：
--
作者：
Dong, Hegan;Sun, Hui;Song, Zhanli
豚草（Ambrosia artemisiifolia L.）会降低农业生产力，特别是在玉米（Zea mays L.）田。土壤种子库（SSB）的时空变化规律对了解该杂草的生长潜力和防治方案具有重要意义。2018年，以新疆伊犁谷地CR入侵年（2012-2017年）为基准，在18块玉米田边缘（每块为bbb1ha）以及距边缘2、5和10 m处测量了CR的SSB密度和种子萌发特征。2016-2018年，我们研究了根除CR植物对降低CR的SSB密度的影响，在玉米田边缘，入侵6年后，CR种子在0 ~ 5 cm土层（SL）的存活率为80.5%；但在玉米地内2、5和10 m处的存活率较低，分别为49.5%、44.1%和42.3%。不同的盐酸盐积累方式导致盐酸盐的分布特征不同。玉米田SSB的增加主要受玉米田边缘CR大规模制种的驱动。当连续2年（2018年）没有新的CR种子投入时，玉米田边缘和田内2、5和10 m处的SSB密度分别下降了90.0、72.9、75.4和74.6%。在种子成熟之前根除CR植物，并持续数年，似乎是控制CR的有效策略。
Common ragweed (CR) (Ambrosia artemisiifolia L.) can reduce agricultural productivity, especially in corn (Zea mays L.) fields. The spatiotemporal variation of the soil seed bank (SSB) of CR is important for understanding the growth potential and control options of this weed. In 2018, we measured SSB density and seed germination characteristics of CR on the margins of cornfields (18 cornfields, each is >1 ha) as well as 2, 5, and 10 m inside the fields from the margin based on the year of CR invasion (2012-2017) in the Yili Valley, Xinjiang, China. From 2016-2018, we studied the effect of eradicating CR plants on reducing the SSB density of CR. Along the cornfield margins, 80.5% of the total CR seeds were viable in the 0-to-5-cm soil layer (SL) after 6 yr of invasion; however, fewer were viable at 2, 5 and 10 m (respectively, 49.5, 44.1, and 42.3%) inside the cornfields. Different modes of SSB accumulation led to different distribution characteristics of the SSB. The increase in the SSB in cornfields was driven by large-scale seed production of CR along the margins of cornfields. When there was no new CR seed input for 2 yr (in 2018), the density of the SSB at cornfield margins and 2, 5, and 10 m inside the fields decreased by 90.0, 72.9, 75.4, and 74.6%, respectively. Eradicating CR plants before their seeds mature, and doing so for several years, appears to be an effective strategy for controlling CR.