Abstract

Info

Title:: Effects of Topographical Soil Physical Properties on Soybean Initial Stage Growth with Small Agricultural Watershed Scale

Author(s):: ZENG Zhao-xia¹; LIU Xiao-li²; JIANG Hong-mei³; (1.Key Laboratory of Agro-ecology/Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China;2.College of Resources and Environment，Hunan Agricultural University,Changsha 410128,China;3.College of Resources and Environment,Lanzhou University,Lanzhou 730000,China)

Keywords:: Small watershed scale; Black soil area; Soil physical properties; Soybean(Glycine max)

Abstract:: Topographical micro-climate has significant effects on soil properties and crop growth in a small typical agricultural watershed of the Mollisol(fertile black soil)region located in the Northeast China.The quantitative characterization of spatiotemporal variability in soil properties and crop growth is an important component for successful precisionagriculture applications and optimization managements,and is essential to improve the resources utilization efficiency.This paper presented the spatial differences of soil physical properties,soybean［Glycine max (L.)Merr.］seed germinations and the initial stage growth in the selected watershed.The watershed was divided into three parts including lowlands,slopelands and highlands according to the terrain landscapes.Effects of the topographical microclimate on soil properties and crop growth were significantly different in the study.The soil temperature and soil warms up in the lowlands was significantly lower and slowly than that in highlands and slopelands.Based on the research results,we discussed reasonable methods and agricultural management practices with temporalspatial perspectives to improve the soil physical quality and water environment,and proposed a theory of spatial heterogeneity of differential management in agricultural ecosystems.