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Magnitude,direction,and drivers of rhizosphere effect on soil nitrogen and phosphorus in global agroecosystem

International Soil and Water Conservation Research 2023年第3期11卷 482-493页

作者： Andong Cai Shengnan Tang Muhammad Ahmed Waqas Bin Wang Di Tian Yang Zhang Yu'e Li Muhammad Nadeem Ashraf Tianjing Ren Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesBeijing100081China The Key Laboratory for Slviculture and Conervation of Ministry of Education College of ForestryBeijing Forestry UniversityBeijing100083China Department of Agroecology Aarhus UniversityBlichers Alle 20PO BOX 50DK-8830 TjeleDenmark Institute of Soil and Environmental Sciences University of Agriculture Faisalabad38000Pakistan Institute of Soil Science and Plant Cultivation State Research InstituteDepartment of Soil Science Erosion and Land ConservationCzartoryskich St.824-100PutawyPoland

The rhizosphere is the most active soil area for material transformation and energy flow of soil,root,and microorganism,which plays an important role in soil biochemical *** the rhizospheric nitrogen(N)and phosphorous(P)were easily disturbed in the agroecosystem,the effects of rhizosphere on the dynamics of soil N and P cycling have not yet been systematically quantified *** summarized the magnitude,direction,and driving forces of rhizosphere effects on agroecosystem's N and P dynamics by 1063 observations and 15 variables from 122 *** effects increased available N(AN,9%),available P(AP,11%),and total P(TP,5%),and decreased nitrate N(NO_(3)-N,18%)and ammonia N(NH_(4)-N,16%).The effect of rhizosphere on total N(TN)was not *** effects improved AN in tropical(12%)and subtropical(14%)*** effect of rhizosphere on TP was greater under subtropical conditions than in other *** most substantial effects of the rhizosphere on TP and AP were observed under humid *** effects increased AN and AP in vegetables more than in other crop *** of N>30o kg ha^(-1) had the most significant and positive rhizosphere effects on TN and AN.P application of 100-150 kg ha^(-1) had the greatest rhizosphere effects on TP and *** effects also improved the microbial(biomass N and P)and enzymatic aspects(urease,acid phosphatase,and alkaline phosphatase)of soil P and N *** equation modeling suggested that aridity indices,fertilizer application rate,soil pH,microbial biomass,and soil enzymes strongly influence the magnitude and direction of the rhizosphere's effect on the P and N ***,these findings are critical for improving soil nutrient utilization efficiency and modeling nutrient cycling in the rhizosphereforagricultural systems.

关键词： rhizosphere effect Agriculture systems Nitrogen cycling Phosphorus cycling Climate Microbial biomass Soil enzymes

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The rhizosphere effect on soil gross nitrogen mineralization: A meta-analysis

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Soil Ecology Letters 2022年第2期4卷 144-154页

作者： Dayong Gan Hui Zeng Biao Zhu Institute of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijing 100871China School of Urban Planning and Design Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China

rhizosphere effects play crucial roles in determining soil carbon(C)and nitrogen(N)***,the rhizosphere effect on soil gross nitrogen(N)mineralization(Nmin)has not been quantitatively assessed on the global *** we performed a meta-analysis of compiled data from 24 publications and 37 species to synthesize the rhizosphere effect on soil gross Nmin and its influencing *** found that the rhizosphere effect significantly enhanced soil gross Nmin by 81%on *** rhizosphere effect was significantly higher in woody species than in nonwoody species,and higher in ECM(ectomycorrhizal)associated species than in AM(arbuscular mycorrhizal)associated ***,the variations of the rhizosphere effect on soil gross Nmin were correlated with those on soil C mineralization,phenol oxidase activity and root biomass rather than with other plant(growth form and mycorrhizal association)and climatic(mean annual temperature and precipitation)*** results support the‘microbial activation’and‘microbial N mining’hypotheses of rhizosphere effects and indicate the coupling of soil C and gross N mineralization in the ***,these findings provide novel insights into the rhizosphere effect on soil gross Nmin among plant growth forms and mycorrhizal associations,and improve our mechanistic understanding of soil N dynamics in the rhizosphere.

关键词： rhizosphere effect Carbon mineralization Nitrogen mineralization Microbial biomass Mycorrhizal association Plant-soil interaction

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Nitrogen fertilization has minimal influence on rhizosphere effects of smooth crabgrass (Digitaria ischaemum) and bermudagrass (Cynodon dactylon)

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Journal of Plant Ecology 2015年第4期8卷 390-400页

作者： Biao Zhu Kevin Panke-Buisse Jenny Kao-Kniffin Earth Sciences Division Lawrence Berkeley National LaboratoryCyclotron RoadBerkeleyCA 94720USA School of Integrative Plant Science Cornell University134 Plant Sciences BuildingIthacaNY 14853USA

Aims Plants generally respond to nitrogen(N)fertilization with increased growth,but N addition can also suppress rhizosphere effects,which consequently alters soil *** quantified the influence of N addition on rhizosphere effects of two C4 grasses:smooth crabgrass(Digitaria ischaemum)and bermudagrass(Cynodon dactylon).Methods Plants were grown in nutrient-poor soil for 80 days with either 20 or 120μg NH4No3-N g dry soil−1.N mineralization rates,microbial biomass,extracellular enzyme activities and bacterial community structure were measured on both rhizosphere and bulk(unplanted)soils after plant *** Findings Fertilization showed nominal differences in net N mineralization,extracellular enzyme activity and microbial biomass between the rhizosphere and bulk soils,indicating minimal influence of N on rhizosphere ***,the presence of plant roots showed the strongest impact(up to 80%)on rates of net N mineralization and activities of three soil enzymes indicative of N release from organic *** component analysis of terminal restriction fragment length polymorphism(t-rFlP)also reflected these trends by highlighting the importance of plant roots in structuring the soil bacterial community,followed by plant species and N fertilization(to a minor extent).overall,the results indicate minor contributions of short-term N fertilization to changes in the magnitude of rhizos-phere effects for both grass species.

关键词： rhizosphere effect N fertilization belowground carbon allocation microbial biomass extracellular enzyme net N mineralization microbial community composition

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rhizosphere organic phosphorus fractions of Simon poplar and Mongolian pine plantations in a semiarid sandy land of northeastern China

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Journal of Arid Land 2015年第4期7卷 475-480页

作者： ZHAO Qiong WANG Hongquan YU Zhanyuan ZENG Dehui State Key Laboratory of Forest and Soil Ecology Institute of Applied Ecology Chinese Academy of Sciences Daqinggou Ecological Station Institute of Applied Ecology Chinese Academy of Sciences University of Chinese Academy of Sciences

The aim of this study was to investigate the role of rhizosphere organic phosphorus （P） in soil P supply in semiarid forests and the effects of tree species on rihizosphere organic P. We examined organic P fractions in rhizosphere and bulk soils of mono-specific Simon poplar （Populus simonii） and Mongolian pine （Pinus sylvestris var. mongolica） plantations in a semiarid sandy soil of Horqin Sandy Land in Northeast China. Total organic P （TPo） accounted for 76% of total P across the two stands. The concentration of organic P （Po） fractions decreased in the order of NaOH-Po〉Res-Po〉HCI-Po〉NaHCO3-Po in both plantations. The concentration of NaHCO3-Po was 38% and 43% lower in rhizosphere soil than in bulk soil in Simon poplar and Mongolian pine plantations, respectively. In contrast, total P, TPo and NaOH-Po significantly accumulated in rhizosphere soil in Simon poplar plantations, but no change in Mongolian pine plantations. Soil recalcitrant organic P fractions were positively correlated with soil organic carbon. The results suggest that rhizosphere labile organic P was an important source of plant-available P in this semiarid region, but the dynamic of rhizosphere recalcitrant organic P fractions varied with tree species and was correlated to organic carbon dynamics.

关键词： rhizosphere effect organic P fractions Populus simonii Pinus sylvestris var. mongolica

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