Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection, Ministry of Education, Guangxi Normal University, Guilin, China.
Key Laboratory of Karst Ecology and Environment Change of Guangxi Department of Education, Guangxi Normal University, Guilin, China.
Int J Phytoremediation. 2020;22(10):1075-1084. doi: 10.1080/15226514.2020.1726871. Epub 2020 Feb 16.
The effects of potassium (K) fertilization (KCl, analytically pure; 0, 60, 200, and 400 mg kg) on the growth and Mn accumulation of in two types of Mn-contaminated soils were investigated. The potential mechanisms underlying the impacts of K fertilization were explored. accumulated high amounts of Mn in both soil conditions. The addition of K fertilizer decreased the soil pH and promoted Mn accumulation in . However, the plant biomass decreased significantly under the high level of K fertilization (400 mg kg), and the oxidative stress was stimulated under Mn contamination. But an appropriate concentration of K fertilizer (200 mg kg) was necessary for the formation of photosynthesis pigments, nonenzymatic antioxidants and antioxidant enzymes, metabolic processes, and nutrient uptake. Furthermore, when plants supplemented with a low level of K fertilization (200 mg kg), the catalase activity in leaves was enhanced to alleviate oxidative stress and protect the plant from Mn contamination. Our study demonstrated that 200 mg kg of K fertilizer has the potential to further enhance the efficiency of Mn phytoremediation by .
本研究探讨了钾（K）施肥（KCl，分析纯；0、60、200 和 400mg/kg）对两种类型锰污染土壤中生长和 Mn 积累的影响。并探究了 K 施肥影响的潜在机制。结果表明，在两种土壤条件下，均能大量积累 Mn。添加 K 肥料会降低土壤 pH 值，并促进 Mn 在体内的积累。然而，高浓度 K 施肥（400mg/kg）会显著降低植物生物量，并在 Mn 污染下刺激氧化应激。但是，适量的 K 肥料（200mg/kg）对于光合作用色素、非酶抗氧化剂和抗氧化酶、代谢过程和养分吸收的形成是必要的。此外，当植物补充低水平 K 施肥（200mg/kg）时，叶片中的过氧化氢酶活性增强，以减轻氧化应激，保护植物免受 Mn 污染。本研究表明，200mg/kg 的 K 肥料有可能通过进一步提高 Mn 植物修复的效率。
