Special Column:Celebration of the 70th Anniversary of IGSNRR, CAS

Dry Soil Layer Forming and Soil Nitrogen Consumption Characteristic of Alfalfa Grassland in the Semi-humid Region of the Loess Plateau

  • 1. Research Center of Dryland Farming in Arid and Semi-arid Area,Northwest A &
    F University,Yangling 712100,China;
    2. College of Plant Sciences,Tarim University,Alar 843300,China;
    3. Gansu Academy of Agricultural Sciences,Lanzhou 730000,China

Received date: 2007-04-01

  Revised date: 2007-12-24

  Online published: 2008-05-28


In order to study dry soil layer forming and soil nitrogen consumption characteristic,promote fertilizing and grass-crop rotation in alfalfa grassland,the paper investigated the dry soil layer and soil nitrogen consumption in the grasslands with alfalfa growing for three years,four years,six years,12 years,14 years,18 years and 26 years.The results showed that dry soil layer was divided into three types: slightly dry soil layer(9%-11%),moderately dry soil layer(7%-9%)and highly dry soil layer(<7%).Slightly dry soil layer occurred in 80-100cm soil of wild land and dry soil layer appeared in 140-600cm soil in alfalfa land.With the prolonged period of alfalfa growth,dry soil layer extended its lower boundary downward and became intensified,moderately dry soil layer appeared in the grasslands with alfalfa growing for 12 years and expanded beyond 500 cm deep below ground.There are regular changes in the available N contents in the alfalfa grassland with different number of growth years.The soil available N contents decreased with the deepening of soil depth,and tended to keep a stable state in soil deeper than 300cm below soil surface;after 26 years of alfalfa growth,the soil N content began to rebound to a certain degree in the upper soil of 0-200cm,but it was difficult to rebound at depths of 200-1000cm.The study showed that reasonable fertilization and grass-crop rotation should be practiced to maintain N balance and continue to increase land productivity after alfalfa growing for more than six years in semi-arid areas of the Loess Plateau.

Cite this article

WAN Su-mei, JIA Zhi-kuan, WANG Yong, HAN Qing-fang . Dry Soil Layer Forming and Soil Nitrogen Consumption Characteristic of Alfalfa Grassland in the Semi-humid Region of the Loess Plateau[J]. JOURNAL OF NATURAL RESOURCES, 2008 , 23(3) : 383 -390 . DOI: 10.11849/zrzyxb.2008.03.004


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