TROPICAL GEOGRAPHY ›› 1996, Vol. 16 ›› Issue (3): 265-270.

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A STUDY ON VETIVER GRASS IN SOIL AMELIORATION, AND SOIL AND MOISTURE CONSERVATION

Xia Hanping1, Ao Huixiu1, He Daoquan1, Liu Shizhong1, Chen Longjiang2   

  1. 1. South China Institute of Botany, Academia Sinica, 510650;
    2. Xingning Office of Soil and Water Conservation, Guangdong 514500
  • Received:1996-01-01 Online:1996-07-30 Published:1996-07-30

Abstract:

Vetiver grass (Vetiveria zizanioides) is a very ideal hedgerow for the vegetative system of soil and moisture conservation,and being widely planted in tropical and sub-tropical regions.The pot and field trials indicated that this plant could efficiently ameliorate soil characteristics.It was capable of lowering acidity and the content of exchangeable Al of strongly acid soil by 0.5-0.7 and 0.3-0.6cmol.kg-1,respectively.Distinct increments of organic matter,total N,available N and K,and total porosity in the soils were found after vetiver was established for 29 months.The vetiver treatment averaged 60% and 93% less runoff and soil loss,and 4%-42% more soil moisture,than the control,respectively.Furthermore,this plant effectively improved the microclimates of fruit garden ecosystem,including an increase of relative humidity by approximately 4%-5%,and a decrease of air temperature by 1-3 degrees centigrade.