[Pathways of soil sulfur input and output in agro-ecosystem under different cropping rotations].
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, S output by the crop products was 26.4 kg.hm-2, and 6.8 kg.hm-2 of S was returned to the soil through root and plant residues. Under wheat-soybean rotation, 24.4 kg.hm-2 of S was removed from and 7.2 kg.hm-2 of S were returned to the soil. Under the rotation of corn with rape, up to 45.4 kg.hm2 was taken out from and only 8.7 kg.hm-2 returned to the soil, respectively. 7.9, 6.4, 6.7 and 18.9 kg.hm-2 of S output by products and 2.6, 1.8, 4.3 and 5.6 kg.hm-2 of S input by residues were obtained in cotton, sorghum, peanuts and paddy rice, respectively. Through estimation of S balance for these systems, 6, 8.5, 24 and 7.1 kg.hm-2.yr-1 of S was lost from soil by growing wheat, corn, rape and paddy rice, respectively.
Wang
Qingren
Q
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. grwang@mail.ifas.ufl.edu
Cui
Yanshan
Y
D018556:Crops, Agricultural / Q000254:growth & development*; D017753:Ecosystem; D012987:Soil / Q000032:analysis*; D013025:Glycine max / Q000254:growth & development; D013455:Sulfur / Q000032:analysis*; D014908:Triticum / Q000254:growth & development; D003313:Zea mays / Q000254:growth & development
D012987:Soil; D013455:Sulfur