Rhizosphere P composition, phosphatase and phytase activities of Polygonum hydropiper grown in excess P soils
Rhizosphere P composition, phosphatase and phytase activities of Polygonum hydropiper grown in excess P soils
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DOI：
10.1007/s00374-017-1218-9
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发表时间：
2017-07
影响因子：
6.5
通讯作者：
Daihua Ye;Ting-xuan Li;Xi-zhou Zhang;Zicheng Zheng;Wenying Dai
中科院分区：
文献类型：
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作者：
Daihua Ye;Ting-xuan Li;Xi-zhou Zhang;Zicheng Zheng;Wenying Dai
本研究以KH_2PO_4和肌醇六磷酸十二钠盐为供试材料，研究了高浓度无机磷(PI)和有机磷(Po)在高水平(400、800和1600mgP·kg~(-1)−_1)下对水葫芦的磷积累和根际特性。矿化(ME)和非矿化(NME)生态型因其养分获取能力不同而被采用。根茎生物量和磷积累量随着磷素水平的增加而增加，而随着磷素浓度的增加而减少。根际pH分别下降0.15~0.45U和0.04~0.14U。正磷酸盐是根际土壤中含量最丰富的形态，在根际耗竭较大，微生态的影响大于非微生态。在高Po处理下，根际土壤中的甘油磷酸盐和六氢肌醇磷酸浓度增加，且ME处理的影响大于NME处理。两个生态型的根际酸性磷酸单酯酶、碱性磷酸单酯酶和植酸酶活性在高磷处理下均高于不施磷处理，而磷酸二酯酶活性则降低。根际土壤酶活性显著高于非根际土壤。从富磷土壤中，根际营养可能通过改变根际特性而获得比非营养生态更高的地上部磷。
This study investigated phosphorus (P) accumulation and rhizosphere characteristics ofPolygonum hydropiperunder high levels (400, 800, and 1600 mg P kg−1) of inorganic P (Pi) and organic P (Po), supplied as KH2PO4andmyo-inositol hexaphosphoric acid dodecasodium salt, respectively. Mining (ME) and non-mining (NME) ecotypes were used since they differed in the capacity of nutrient acquisition. Biomass and P accumulation in shoots and roots of the ME increased by increasing Pi levels, whereas they decreased by increasing Po concentrations. Rhizosphere pH declined by 0.15–0.45 U for the ME and 0.04–0.14 U for the NME. Orthophosphate was the most abundant form, and it depleted greatly in the rhizosphere, with higher effect by the ME than by the NME. Glycerophosphate and inositol hexakisphosphate concentrations increased in the rhizosphere under high Po treatments with higher effect by the ME than by the NME. Rhizosphere acid phosphomonoesterase, alkaline phosphomonoesterase, and phytase activities of both ecotypes were higher in high P treatments than the treatment without P, whereas phosphodiesterase activity decreased. Significantly higher enzyme activities were observed in the rhizosphere soil of the ME than the NME. Probably, the ME might obtain higher shoot P than the NME from P-enriched soils through changes in rhizosphere properties.