Papers by Author: Jian Ming Li

Abstract: The interaction of soil aggregate with humic substances (HS) is important for fertility and soil carbon sequestration, So it is one of the hot issues of international affairs and Low-carbon Society. In this paper, the pot experiment was conducted to study the effect of the different organic materials on the combined states of humus in black soil. The results showed as follow: Compared with control treatment(CK), application of organic materials significantly increased content of loosely combined in>2mm and content of stably combined, but there was markedly differences among organic materials. Woody residues made loosely and unitedly and stably combined forms of humus in 1-0.5mm aggregates higher than others, at the same time, unitedly and stably combined in 0.5-0.25mm of woody residues were the highest. Animal excrement significantly increased unitedly and stably combined in 2-1mm. And herb residues enhanced stably combined in >2mm obviously. Use of animal remnant resulted in significant increase of tightly combined, whereas markedly decreased tightly combined in 2-1mm. Optical property combined forms of humus varied among organic materials.

Abstract: Elemental Analyzers and Infrared Spectrometer was used to study the effects of the different organic materials on the structure and elemental composition of humus in black soil. The results showed as follow: Compared with control treatment (CK), application of organic materials decreased aliphatic compounds of humic acid(HA) and fulvic acid(FA), and the role of plant residues was the most obvious. In humin linked to clay (HMc), all the organic materials could increased aliphatic compounds, at the same time, decreased content of aryl-groups C＝C. After five years, used of organic materials decreased content of hydroxyl and saccharide in humin linked to iron(HMi), but increased aliphatic compounds. Compared with CK, after five years, application of organic materials resulted in significant decrease of C and H content, and the role of herb residues was the most obvious. Apart from animal excrement, others organic materials significantly increased N content of HA, and there was significant differences among different treatments. Application of herb residues increased N of FA. The order of C content was: animal remnant>animal excrement>CK>woody residues>herb residues, and no significant differences were observed for this parameter among different treatments. Use of organic materials resulted in significant decrease of C and H, but enhanced O content of HMi , and the role of herb residues was the most obvious, at the same time, herb residues decreased N of HMi. After application of animal excrement and woody residues，the C and N content of HMc were enhanced, and H content of HMc was decreased. Compared with CK, application of organic materials resulted in significant decrease of H content of HMc, and there was significant differences among different treatments.