Soil phosphorus availability and rice phosphorus uptake in paddy fields under various agronomic practices

查看全文 作　　者：Bingshen [1,2,3]JIANG;Jianlin [1]SHEN;Minghong [1,4]SUN;Yajun [1]HU;Wenqian [1,2]JIANG;Juan [1]WANG;Yong [1]LI;Jinshui [1,2]WU

机构地区：[1]Key Laboratory of Agro-ecological Processes in Subtropical Region and Changsha Research Station for Agricultural&Environmental Monitoring,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China;[2]University of Chinese Academy of Sciences,Beijing 100049,China;[3]College of Biological and Food Engineering,Huanghuai University,Zhumadian 463000,China;[4]College of Resources&Environment,Hunan Agricultural University,Changsha 410128,China

出　　处：《Pedosphere》索引2021年第31卷第1期,共13页

基　　金：supported by the National Key Research and Development Program of China (Nos. 2016YFD0200307 and 2018YFC0213302);the Youth Innovation Promotion Association of Chinese Academy of Sciences (No. 2017418)。 摘　　要：Agronomic practices affect soil phosphorus(P) availability, P uptake by plants, and subsequently the efficiency of P use. A field experiment was carried out to investigate the effects of various agronomic practices(straw incorporation, paddy water management, nitrogen(N) fertilizer dose, manure application,and biochar addition) on soil P availability(e.g., soil total P(STP), soil available P(SAP), soil microbial biomass P(SMBP), and rice P uptake as well as P use efficiency(PUE)) over four cropping seasons in a rice-rice cropping system, in subtropical central China. Compared to the non-straw treatment(control,using full dose of chemical N fertilizer), straw incorporation increased SAP and SMBP by 9.3%–18.5% and 15.5%–35.4%, respectively;substituting half the chemical N fertilizer dose with pig manure and the biochar application increased STP, SAP, and SMBP by 10.5%–48.3%, 30.2%–236.0%, and 19.8%–72.4%,respectively, mainly owing to increased soil P and organic carbon inputs;adding a half dose of N and no N input(reduced N treatments) increased STP and SAP by 2.6%–7.5% and 19.8%–33.7%, respectively, due to decreased soil P outputs. Thus, soil P availability was greatly affected by soil P input and use. The continuous flooding water regime without straw addition significantly decreased SMBP by 11.4% compared to corresponding treatments under a mid-season drainage water regime. Total P uptake by rice grains and straws at the harvest stage increased under straw incorporation and under pig manure application, but decreased under the reduced N treatments and under biochar application at a rate of 48 t ha-1, compared to the control. Rice P uptake was significantly positively correlated with rice biomass, and both were positively correlated with N fertilizer application rates, SAP, SMBP, and STP. Phosphorus use efficiency generally increased under straw incorporation but decreased under the reduced N treatments and under the manure application(with excessive P input), compared to the control. These results showed that straw incorporation can be used to increase soil P availability and PUE while decreasing the use of chemical P fertilizers. When substituting chemical fertilizers with pig manure, excess P inputs should be avoided in order to reduce P accumulation in the soil as well as the environmental risks from non-point source pollution. 关键词：BIOCHAR manure fertilizer nutrient management P use efficiency paddy soil straw incorporation water regime

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Soil phosphorus availability and rice phosphorus uptake in paddy fields under various agronomic practices

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