Enhanced P accumulation characteristics and P removal potentials of Pilea sinofasciata grown under P enriched soils supplied with nitrogen

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• 作者：Hongmei Yu ; Tingxuan Li ; ^{litinx@263.net" class="auth_mail" title="E-mail the corresponding author} ; Zicheng Zheng ; Xizhou Zhang ; Haiying Yu ; Guangdeng Chen
• 关键词：Nitrogen (N) ; Phosphorus (P) ; Phytoremediation ; Pilea sinofasciata
• 刊名：Ecological Engineering
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：91
• 期：Complete
• 页码：44-49
• 全文大小：850 K

文摘

Phytoextraction is an attractive method to extract excess soil P. However, most of the potential P accumulators have relatively low P removal potential when used for extracting excess soil P. An important question then is how can we improve the P uptake capability of P accumulators? This study was conducted to investigate the effects of different nitrogen (N) treatments (0–350 mg N kg⁻¹) on growth, P accumulation characteristics, and P removal potentials of P. sinofasciata. A mining ecotype (ME) and a non-mining ecotype (NME) were grown for 9 weeks in P enriched soils affected by different N treatments. The pot survey revealed that two ecotypes of P. sinofasciata showed significant increases in shoot biomass and P accumulation with ascending N supplied up to a level of 140 mg N kg⁻¹, beyond which a notable decrease was found. The ME demonstrated greater shoot biomass and P accumulation than the NME. The P extraction ratio in shoot of the ME reached 15.92% under 140 mg N kg⁻¹, and increased by 30.08% compared with that of NME. Shoot P removal of the ME reached 29.58 mg kg⁻¹ under 140 mg N kg⁻¹ which was higher than the NME. The ME and NME both showed high levels of P removal from soil, maximum potential yield, and P removal potential after the addition of N. In conclusion, both ecotypes of P. sinofasciata show high P accumulation and P removal from N impacted soils, and thus P. sinofasciata is a potential and worthy candidate for phytoextraction.