Abstract

Copper (Cu) contamination in soils is becoming a serious problem. Therefore, an experiment in plastic pots was carried out to investigate interactive influence of rice straw BC (BC₀:0, BC₁:5, and BC₂:10% w/w) and nitrogen fertilizer (N₀:0, N₁:140, N₂:280, and N₃:420 kg ha⁻¹) on plant growth, Cu mobility and phytoavailability to Boehmeria nivea in Cu polluted soil. Results revealed that BC × N fertilizer had significantly (p ≤ 0.05) increased the growth of B. nivea in terms of biomass, height of plant, diameter of stem and number of leaves. Furthermore, BC × N fertilizer resulted in significant changes in pH, electrical conductivity and cation exchange capacity of soil after harvesting in comparison with control. However, the influence of BC × N fertilizer on soil extractable Cu and Cu uptake by plant varied with levels of N fertilizer. The BC₂N₁ treatment significantly increased the shoot biomass of B. nivea by 635% (fresh biomass) and 452% (dry biomass), but reduced Cu contents in roots, stems and leaves i.e., 52, 23 and 34 mg kg⁻¹, respectively. Thereby, high dose of BC along with low N fertilizer could be considered as an efficient soil amendment combination for Cu stabilization and higher biomass production of B. nivea in highly Cu contaminated soil.

摘要

土壤中的铜 (Cu) 污染正成为一个严重的问题。因此，在塑料盆中进行了一项实验，以研究稻草 BC（BC ₀ :0、BC ₁ :5 和 BC ₂ :10% w/w）和氮肥（N ₀ :0、N ₁ :140、N ₂ :280 和 N ₃ :420 kg ha ^{- 1} ) 对植物生长、Cu 迁移率和植物有效性对Cu 污染土壤中Boehmeria nivea 的影响。结果表明，BC×N肥料显著有（p  ≤0.05）提高的生长B.妮维雅在生物量、植物高度、茎直径和叶数方面。此外，与对照相比，BC × N 肥料导致收获后土壤的 pH 值、电导率和阳离子交换能力发生显着变化。然而，BC × N 肥料对土壤可提取铜和植物吸收铜的影响随氮肥水平的不同而不同。BC ₂ N ₁处理显着增加了B. nivea的枝条生物量635%（新鲜生物量）和 452%（干生物量），但降低了根、茎和叶中的 Cu 含量，即 52、23 和 34 mg kg ^{- 1}， 分别。因此，高剂量的 BC 和低氮肥可以被认为是一种有效的土壤改良组合，用于在高度铜污染的土壤中稳定铜和提高B. nivea 的生物量生产。