Pathways of soil sulfur input and output in agro-ecosystem under different cropping rotations

Abstract

Abstract: This paper mainly dealt with the pathways of sulfur (S) input and output in agro ecosystems under general cropping rotations in northern China. The results indicated that in a typical corn wheat rotation system,Soutput by the crop products was 26.4 kg穐m^-2,and 6.8 kg穐m^-2 of Swas returned to the soil through root and plant residues. Under wheat soybean rotation,24.4 kg穐m^-2 of Swas removed from and 7.2 kg穐m^-2 of Swere returned to the soil. Under the rotation of corn with rape,up to 45.4 kg穐m² was taken out from and only 8.7 kg穐m^-2 returned to the soil,respectively. 7.9,6.4,6.7 and 18.9 kg穐m^-2 of Soutput by products and 2.6, 1.8, 4.3 and 5.6 kg穐m^-2 of Sinput by residues were obtained in cotton,sorghum,peanuts and paddy rice,respectively. Through estimation of Sbalance for these systems,6,8.5,24 and 7.1 kg穐m^-2 穣r^-1 of Swas lost from soil by growing wheat,corn,rape and paddy rice,respectively.

CLC Number:

S512.1

WANG Qing ren, CUI Yanshan . Pathways of soil sulfur input and output in agro-ecosystem under different cropping rotations[J]. Chinese Journal of Applied Ecology, 2003, (6): 935-940.

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