Long-term biochar addition significantly decreases rice rhizosphere available phosphorus and its release risk to the environment

作     者：Hao Chen Jiahui Yuan Guanglei Chen Xu Zhao Shenqiang Wang Dengjun Wang Lei Wang Yujun Wang Yu Wang 

作者机构：State Key Laboratory of Soil and Sustainable AgricultureChangshu National Agro-Ecosystem Observation and Research StationInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China University of the Chinese Academy of SciencesBeijing 10049China School of FisheriesAquaculture and Aquatic SciencesAuburn UniversityAuburnAL 36849USA Nanjing Institute of Environmental SciencesMinistry of Ecology and EnvironmentNanjing 210042China Heilongjiang Academy of Black Soils Conservation and UtilizationKey Laboratory of Soil Environment and Plant Nutrition of Heilongjiang ProvinceHeilongjiang Academy of Agricultural SciencesHarbin 150086China 

出 版 物：《Biochar》 (生物炭（英文）)

年 卷 期：2022年第4卷第1期

页      面：281-295页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：the National Natural Science Foundation of China(No.42277026) the National Key Research and Development Program of China(2021YFD1700802) the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDA28090300) 

主　　题：Biochar Rice rhizosphere Phosphorus availability DGT DIFS SPRRI 

摘      要：Phosphorus(P)availability,diffusion,and resupply processes can be altered by biochar addition in flooded rice rhizosphere,which controls the risk of P release to the ***,there are few in-situ investigations of these rhizospheric processes and *** explore the effects of biochar addition on soil P availability,high-resolution dialysis(HR-Peeper),diffusive gradients in thin films(DGT),and zymography techniques were used to provide direct evidence in the rice rhizosphere at the sub-millimeter ***-term(9-years)field and greenhouse pot experiments demonstrated that biochar addition notably decreased the soluble/labile P and Fe concentrations in rice rhizosphere(*** biochar addition;CK)based on the results of Peeper,DGT,and two-dimensional imaging of labile P ***-induced fluxes in the soil/sediment(DIFS)model and sediment P release risk index(SPRRI)further indicated that biochar addition decreased the diffusion and resupply capacity of P from soil solid to the solution,thereby decreasing P release risk to the *** processes were dominated by Fe redox cycling and the hydrolysis of Al(hydro)oxides that greatly increased the unavailable P(Ca-P and residual-P).Additionally,greenhouse pot experiments(without additional biochar)showed that the previous long-term biochar addition significantly increased soil phosphatase activity,due to an adaptive-enhancing response to P decrease in the rhizosphere *** in-situ study on the biogeochemical reactions of P in the rice rhizosphere may provide a new and direct perspective to better evaluate the biochar addition and potential benefits to agricultural soils.