Abstract: Through a fixed case study on the ecological field of plant individuals and populations.theconcept of ecological field gradient is put forward, and the ecological field gradient modelsof plant and Anewolepidium chinense individuals are established.The variation forms ofA.chinense crown field gradient conform to the Rayleigh distribution, and there is onemaximum value at the point r=.The A.chinense root system field gradient variesin a complex distribution, and there are two maximum values at the points r=0 and r=a.The ecological field gradient of A.chinense individuals is related to its population density.

Key words: Aneurolepidium chinense, Ecological field, Ecological field gradient, Ecological potential, sap flow, soil water, riparian poplar plantation., shallow groundwater, thermal dissipation probe