Effect of plough pans on the growth of soybean roots in the black-soil region of northeastern China  

作　　者：DONG Wen-cai FU Qiang WANG Quan-jiu CAO Cheng-peng 

机构地区：[1]College of Water Conservancy and Architecture,Northeast Agricultural University [2]Institute of Water Resources,Xi'an University of Technology

出　　处：《Journal of Integrative Agriculture》2017年第10期2191-2196,共6页农业科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (51239009,41301288,51479032 and 51409213);the Postdoctoral Science Foundation of China (2014M561317);the Heilongjiang Postdoctoral Financial Assistance,China (LBH-Z13023);the Heilongjiang Provincial Department of Education Science and Technology Research Project,China (12541039);the Young Talents Project of Northeast Agricultural University,China (14QC48)

摘　　要：Plough pans （PPs）, common in the black-soil region of northeastern China, have significant effects on the root systems of crops. We conducted a field experiment to study the distribution of soybean roots under the influence of PPs. The soybean roots showed compensatory growth above the PP, with higher root length and weight in soil with a PP compared to those without a PP. Roots were heavier and longer in the 15-75 cm soil layer without a PP than with a PP. Soil porosity was lower in the PP and the soil below the PP, which likely decreased the oxygen content of the soil and induced more growth of roots above the PP. The PP is also likely to decrease infiltration of rain-water and hinder the migration of nitrate downward, which in turn increased the density and length of soybean root hairs, which, hence, promoted growth.Plough pans （PPs）, common in the black-soil region of northeastern China, have significant effects on the root systems of crops. We conducted a field experiment to study the distribution of soybean roots under the influence of PPs. The soybean roots showed compensatory growth above the PP, with higher root length and weight in soil with a PP compared to those without a PP. Roots were heavier and longer in the 15-75 cm soil layer without a PP than with a PP. Soil porosity was lower in the PP and the soil below the PP, which likely decreased the oxygen content of the soil and induced more growth of roots above the PP. The PP is also likely to decrease infiltration of rain-water and hinder the migration of nitrate downward, which in turn increased the density and length of soybean root hairs, which, hence, promoted growth.

关 键 词：compensatory growth plough pans root characteristics SOYBEAN 

分 类 号：S565.1[农业科学—作物学]