Sci Total Environ
Foreign Environmental Cooperation Center, Ministry of Ecology and Environment, Beijing 100035, China. Electronic address:
Published: December 2024
Remediation of heavy metal (HM)-contaminated farmland has attracted much attention. Intercropping shows great potential in the remediation of HM-contaminated farmland and has been extensively studied. However, it remains uncertain how intercropping influences phytoremediation. In this study, a meta-analysis was performed to evaluate the effects of intercropping on plant growth, plant Cd uptake, residual soil Cd concentration, and the related impact factors. The results showed that compared with monocropping, intercropping decreased plant biomass (-13.0 %) and Cd uptake (-26.9 %), whereas it increased Cd translocation factor (5.23 %) and soil pH (2.74 %). However, intercropping decreased residual soil Cd concentration by -2.08 % under the conditions of low plant biomass and less Cd uptake. These indicate that phytoextraction may contribute little to soil Cd removal in intercropping, and the indirect effects of intercropping are more important than its direct effects. Intercropping effects were affected by experimental and environmental factors. In terms of decreasing residual soil Cd concentration, intercropping produced large effect under at least one of the following conditions: monocots-dicots combination, intercropping with hyperaccumulator, in the soil contaminated by industrial pollution-derived Cd, at soil Cd level of ≤10.0 mg/kg, in acid soil (pH ≤ 6.50), and at the medium experimental duration of 61-120 d. This study confirms that intercropping can accelerate the phytoremediation of Cd-contaminated soil, and indirect effects of intercropping may play important roles.
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http://dx.doi.org/10.1016/j.scitotenv.2024.177350 | DOI Listing |
Molecules
December 2024
Department of Microbiology and Biomonitoring, University of Agriculture, al. A. Mickiewicza 21, 31-120 Krakow, Poland.
Insectary plants, such as sweet alyssum, coriander, and white mustard, are well known for their traits that attract beneficial insects, allowing them to protect crops from pests. The aim of the study was to analyze the compounds that are important in the antioxidant response, such as malondialdehyde, ascorbic acid, proline, total phenolics, and total flavonoids, as well as the content of elements, including macroelements (K, Mg, Na, Ca, P, and S) and heavy metals (Cd, Cu, Zn, Pb, Ni, Mn, and Fe) in broad bean plants. These plants were grown in field conditions as the main protected plant alongside a mixture of three insectary plants at different proportions of the individual components.
View Article and Find Full Text PDFInsects
December 2024
Julius-Kuehn Institute, Koenigin-Luise-Str. 19, 14195 Berlin, Germany.
Maize productivity has remained low and has worsened in the wake of a changing climate, resulting in new invasive pests, with pests that were earlier designated as minor becoming major and with pathogens being transported by pests and/or entering their feeding sites. A study was conducted in 2021 in the Kisumu and Makueni counties, Kenya, to determine how different maize cropping systems affect insect diversity, insect damage to maize, and insects' ability to spread mycotoxigenic fungi in pre-harvest maize. The field experiments used a randomized complete block design, with the four treatments being maize monocrop, maize intercropped with beans, maize-bean intercrop with the addition of at planting, and push-pull technology.
View Article and Find Full Text PDFFront Plant Sci
December 2024
College of Agronomy and Biotechnology, Southwest University/Engineering Research Center of South Upland Agriculture, Ministry of Education, Chongqing, China.
Introduction: Crop rotation of tobacco with other crops could effectively break the negative impact of continuous tobacco cropping, but the mechanisms of intercropping system effects on tobacco, especially on the rhizosphere, are not clear.
Methods: In this study, we investigated the impact of intercropping system on the diversity and function of tobacco metabolites and microorganisms through metabolomic and metagenomic analyses of the tobacco rhizosphere microenvironment intercropped with maize and soybean.
Results: The results showed that the contents of huperzine b, chlorobenzene, and P-chlorophenylalanine in tobacco rhizosphere soils differed significantly among soybean-tobacco and maize-tobacco intercropping system.
Front Plant Sci
December 2024
College of Agronomy, Sichuan Agricultural University/Sichuan Engineering Research Center for Crop Strip Intercropping System/Key Laboratory of Crop Ecophysiology and Farming System in Southwest, Ministry of Agriculture, Chengdu, China.
Background: Legumes, in the initial event of symbiosis, secrete flavonoids into the rhizosphere to attract rhizobia. This study was conducted to investigate the relationship between crop root exudates and soybean nodule development under intercropping patterns.
Method: A two years field experiments was carried out and combined with pot experiments to quantify the effects of planting mode, i.
BMC Plant Biol
January 2025
College of Grassland Agriculture, Northwest A&F University, Yangling, 712100, China.
To investigate the effects of row ratio configurations on intercropping advantages and related rhizosphere microbial communities, a field experiment involving five treatments of different rows of broomcorn millet, i.e., P1M1 (1 row of broomcorn millet intercropped with 1 row of alfalfa), P2M3, P1M2, P1M3 and broomcorn millet alone (SP), was conducted on the Loess Plateau of China.
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