Record Details

Lignin biochemistry and soil N determine crop residue decomposition and soil priming.

KRISHI: Publication and Data Inventory Repository

View Archive Info
 
 
Field Value
 
Title Lignin biochemistry and soil N determine crop residue decomposition and soil priming.
 
Creator Catherine E. Stewart
Pratibha Moturi, Ronald F. Follett, Ardell D. Halvorson
 
Subject Decomposition
Lignin
Temperature
Nitrogen
Dissolved organic carbon
Lignin biomarkers
 
Description Not Available
Residue lignin content and biochemistry are important properties influencing residue decom- position dynamics and native soil C loss through priming. The relative contribution of high lignin residues to soil organic matter (SOM) may be less than previously believed, be more sensitive to soil N status, and may be more sensitive to increased temperature. We examined the role of residue bio- chemistry, temperature, and soil N on the decompo- sition dynamics of five crop residues varying in lignin content and composition (corn, sorghum, soybean, sunflower and wheat). We used natural abundance d13CO2 to quantify residue decomposition and soil priming from a soil previously cropped to wheat- fallow or to corn-millet-wheat at 20 and 30 °C in a laboratory incubation. High lignin residues decom- posed more completely than low lignin residues, supporting a new model of SOM formation suggesting high lignin residues have a lower efficiency for stabilizing SOM due to inefficient microbial process- ing. However, residues with lower residue respiration had greater soil C respiration (soil priming). Residue SG lignin was positively related to residue C respired and H-lignin positively related to soil C respired in all soils and temperatures, resulting in no net lignin chemistry effect on the combined total C respired. Effects of lignin on residue decomposition were most apparent in treatments with lower soil N contents indicating N limitation. Measuring both residue and soil respiration and considering soil N status is important to accurately assess the effects of residue biochemistry on soil organic carbon.
Not Available
 
Date 2021-08-21T04:35:06Z
2021-08-21T04:35:06Z
2015-05-11
 
Type Article
 
Identifier Not Available
0168-2563
http://krishi.icar.gov.in/jspui/handle/123456789/58940
 
Language English
 
Relation Not Available;
 
Publisher Springer