Wu Jingtao, Dumat Camille, Lu Huanping, Li Yingwen, Li Hanqing, Xiao Yanhui, Zhuang Ping, Li Zhian
Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Xingke Road no.723, Tianhe District, Guangzhou, 510650, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Environ Sci Pollut Res Int. 2016 Apr;23(7):6661-70. doi: 10.1007/s11356-015-5888-2. Epub 2015 Dec 9.
Wollastonite application in cadmium-contaminated soils can reduce cadmium concentrations in plant, while the side effect is the synchronous immobilization of micronutrients, which reduces micronutrient uptake in plant, inducing micronutrient deficient symptoms. Accordingly, we investigated whether the supplement of Zn and Mn fertilizers after the wollastonite addition could promote the growth and photosynthesis in amaranth (Amaranthus tricolor L.). In this study, plants were cultivated in cadmium-contaminated soil under micronutrient fertilization alone, wollastonite addition, and combination of wollastonite and micronutrient fertilization treatments. Then, plant biomass; photosynthesis parameters; and total Cd, Zn, and Mn concentrations were investigated. Moreover, chemical extractions were performed on soil samples. The results show that application of wollastonite decreased Cd, Zn, and Mn concentrations in plant and availability in soil and it increased the gas exchange ability of plants. But, it reduced the chlorophyll content in leaves and had no positive influence on plant biomass. In comparison, Zn and Mn fertilization after wollastonite application greatly increased plant biomass and photosynthetic ability. It also reduced Cd phytoavailability more efficiently. Therefore, synergistic improvement of physiological status of farmland crop by sequential treatment with first wollastonite for cadmium immobilization, and then micronutrient fertilization to avoid micronutrient deficiency, was demonstrated.
硅灰石应用于镉污染土壤可降低植物中的镉浓度，但其副作用是使微量营养元素同步固定，这会减少植物对微量营养元素的吸收，引发微量营养元素缺乏症状。因此，我们研究了添加硅灰石后补充锌肥和锰肥是否能促进苋菜（苋属三色苋）的生长和光合作用。在本研究中，将植物种植在镉污染土壤中，设置单独施用微量营养元素肥料、添加硅灰石以及硅灰石与微量营养元素肥料组合的处理。然后，对植物生物量、光合作用参数以及镉、锌和锰的总浓度进行了研究。此外，还对土壤样品进行了化学提取。结果表明，施用硅灰石降低了植物中镉、锌和锰的浓度以及土壤中的有效性，同时提高了植物的气体交换能力。但是，它降低了叶片中的叶绿素含量，且对植物生物量没有积极影响。相比之下，施用硅灰石后再施用锌肥和锰肥极大地增加了植物生物量和光合能力。它还更有效地降低了镉的植物有效性。因此，证明了通过先用硅灰石固定镉，然后施用微量营养元素肥料以避免微量营养元素缺乏的顺序处理，可协同改善农田作物的生理状况。
