Emission of carbon dioxide influenced by nitrogen and water levels from soil incubated straw

被引：7

作者：

Abro, S. A. ^{[1
]}

Tian, X. H. ^{[1
]}

You, D. H. ^{[1
]}

Wang, X. D. ^{[1
]}

机构：

[1] NW A&F Univ, Coll Resources & Environm Sci, Yangling 712100, Shaanxi, Peoples R China

来源：

PLANT SOIL AND ENVIRONMENT | 2011年 / 57卷 / 06期

关键词：

CO2-C evolution; moisture; nitrogen; straw decomposition; RESIDUE MANAGEMENT; ORGANIC-CARBON; MINERALIZATION; DECOMPOSITION; DYNAMICS; WHEAT; AVAILABILITY; MOISTURE; SURFACE; MATTER;

D O I：

10.17221/387/2010-PSE

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

An incubation study was carried out to investigate the influence of nitrogen rates to determine optimum C/N ratio under various moisture levels for straw decomposition and sequester carbon (C) in the soil. The aim was to observe straw carbon mineralization through measuring the amount of CO2 evolution. A clay loam topsoil mixed with maize straw was supplied with four nitrogen rates (0.04, 0.08, 0.16, 0.32 g N/kg) using (NH4)(2)SO4 to adjust C/N ratios at 82, 42, 20, and 10. Soil moisture was maintained at 55%, 70%, 85%, and 100% of field capacity incubated at 25 degrees C for 53 days. The experiment was set up with 16 treatments arranged in complete randomized design. Results showed that mixing of straw with soil increased 50% cumulative CO2-C compared to controls. Averagely, about 44% of added maize straw C was mineralized to CO2-C. Straw addition along with nitrogen and moisture had significant relationships (P < 0.05) to cumulative CO2-C, soil organic C and microbial biomass C. There was a highly significant relationship (R-2 = 0.99) between CO2-C emission and incubation time.

引用

页码：295 / 300

页数：6

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