Lin Lijin, Liao Ming'an, Ren Yajun, Luo Li, Zhang Xiao, Yang Daiyu, He Jing
College of Horticulture, Sichuan Agricultural University, Ya'an, Sichuan 625014, China; Ya'an Soil and Water Conservation Monitoring Substation, Ya'an, Sichuan 625000, China.
College of Horticulture, Sichuan Agricultural University, Ya'an, Sichuan 625014, China.
PLoS One. 2014 Dec 9;9(12):e114957. doi: 10.1371/journal.pone.0114957. eCollection 2014.
Pot and field experiments were conducted to study the effects of mulching with straw of cadmium (Cd) tolerant plants (Ranunculus sieboldii, Mazus japonicus, Clinopodium confine and Plantago asiatica) on growth and Cd accumulation of Galinsoga parviflora in Cd-contaminated soil. In the pot experiment, mulching with M. japonicus straw increased the root biomass, stem biomass, leaf biomass, shoot biomass, plant height and activities of antioxidant enzymes (superoxide dismutase, peroxidase and catalase) of G. parviflora compared with the control, whereas mulching with straws of R. sieboldii, C. confine and P. asiatica decreased these parameters. Straws of the four Cd-tolerant plants increased the Cd content in roots of G. parviflora compared with the control. However, only straws of M. japonicus and P. asiatica increased the Cd content in shoots of G. parviflora, reduced the soil pH, and increased the soil exchangeable Cd concentration. Straw of M. japonicus increased the amount of Cd extraction in stems, leaves and shoots of G. parviflora by 21.11%, 29.43% and 24.22%, respectively, compared with the control, whereas straws of the other three Cd-tolerant plants decreased these parameters. In the field experiment, the M. japonicus straw also increased shoot biomass, Cd content in shoots, and amount of Cd extraction in shoots of G. parviflora compared with the control. Therefore, straw of M. japonicus can be used to improve the Cd extraction ability of G. parviflora from Cd-contaminated soil.
通过盆栽和田间试验，研究了用镉（Cd）耐受植物（日本毛茛、通泉草、并头黄芩和车前）的秸秆覆盖对Cd污染土壤中辣子草生长和Cd积累的影响。在盆栽试验中，与对照相比，用通泉草秸秆覆盖增加了辣子草的根生物量、茎生物量、叶生物量、地上部生物量、株高以及抗氧化酶（超氧化物歧化酶、过氧化物酶和过氧化氢酶）的活性，而用日本毛茛、并头黄芩和车前的秸秆覆盖则降低了这些参数。与对照相比，四种Cd耐受植物的秸秆增加了辣子草根部的Cd含量。然而，只有通泉草和车前的秸秆增加了辣子草地上部的Cd含量，降低了土壤pH值，并增加了土壤交换性Cd浓度。与对照相比，通泉草秸秆使辣子草茎、叶和地上部的Cd提取量分别增加了21.11%、29.43%和24.22%，而其他三种Cd耐受植物的秸秆则降低了这些参数。在田间试验中，与对照相比，通泉草秸秆也增加了辣子草的地上部生物量、地上部Cd含量和地上部Cd提取量。因此，通泉草秸秆可用于提高辣子草从Cd污染土壤中提取Cd的能力。
