EFFECTS OF DISTURBANCE AND SOIL AMENDMENTS ON DISSOLVED ORGANIC-CARBON AND ORGANIC ACIDITY IN RED PINE FOREST FLOORS

被引:50
作者
CRONAN, CS [1 ]
LAKSHMAN, S [1 ]
PATTERSON, HH [1 ]
机构
[1] UNIV MAINE,DEPT CHEM,ORONO,ME 04469
关键词
D O I
10.2134/jeq1992.00472425002100030025x
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A site manipulation experiment was conducted to test the effects o liming, drought, fertilization, sawdust amendment, and root trenching on water-soluble humic substances in the 0 horizon of a mature red pine (Pinus resinosa Ait.) stand in Maine. Concentrations of water-extractable dissolved organic carbon (DOC) in the sawdust and root trenching treatments were approximately twice as high as DOC in the untreated controls and other treatments. Mean carboxyl group contents of DOC ranged from 4.8 to 6.3 mol/kg C among treatments and controls. Control and drought treatments contained the highest carboxyl contents, whereas the sawdust and fertilizer treatments had the lowest carboxyl densities. Synchronous scan fluorescence spectra for the water extracts contained major peaks at 350, 395, and 470 nm, and these peaks were similar to those obtained for reference humic and fulvic acid standards, as well as selected aromatic model compounds. Overall, the fertilizer treatment produced a 20% decrease, the root trenching generated a 70% increase, and the sawdust treatment yielded a 120% increase in the release of organic acid ligands as compared with the control plots. The twofold range of variation in DOC and organic acidity associated with different substrate conditions in this experiment was considerably smaller than the tenfold range of variation reported in the literature for sites from diverse geographic locations. This suggests that the quantitative fluxes of DOC and organic acidity from forest soil 0 horizons are determined by the interactive effects of substrate conditions, climate, and other local site factors.
引用
收藏
页码:457 / 463
页数:7
相关论文
共 32 条
[1]  
AIKEN G, 1985, HUMIC SUBSTANCES SOI
[2]  
Beyer WH, 1966, HDB TABLES PROBABILI
[3]   SPECTROFLUOROMETRIC INVESTIGATION OF TRACE-METAL COMPLEXATION BY AN AQUEOUS CHESTNUT LEAF LITTER EXTRACT [J].
BLASER, P ;
SPOSITO, G .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1987, 51 (03) :612-619
[4]  
CHRISTMAN RF, 1983, AQUATIC TERRESTRIAL
[5]   CONTROLS ON LEACHING FROM CONIFEROUS FOREST FLOOR MICROCOSMS [J].
CRONAN, CS .
PLANT AND SOIL, 1980, 56 (02) :301-322
[6]   COMPARATIVE EFFECTS OF PRECIPITATION ACIDITY ON 3 FOREST SOILS - CARBON CYCLING RESPONSES [J].
CRONAN, CS .
PLANT AND SOIL, 1985, 88 (01) :101-112
[7]   CHEMISTRY AND TRANSPORT OF SOLUBLE HUMIC SUBSTANCES IN FORESTED WATERSHEDS OF THE ADIRONDACK PARK, NEW-YORK [J].
CRONAN, CS ;
AIKEN, GR .
GEOCHIMICA ET COSMOCHIMICA ACTA, 1985, 49 (08) :1697-1705
[8]  
CRONAN CS, 1985, WATER AIR SOIL POLL, V26, P355
[9]  
CRONAN CS, 1990, ORGANIC ACIDS AQUATI, P245
[10]   ORGANIC-CARBON FRACTIONS IN EXTRACTS OF O AND B HORIZONS FROM A NEW-ENGLAND SPODOSOL - EFFECTS OF ACID TREATMENT [J].
DAVID, MB ;
VANCE, GF ;
RISSING, JM ;
STEVENSON, FJ .
JOURNAL OF ENVIRONMENTAL QUALITY, 1989, 18 (02) :212-217