Variation in soil net mineralization rates with dissolved organic carbon additions

被引:165
作者
Magill, AH [1 ]
Aber, JD [1 ]
机构
[1] Univ New Hampshire, Complex Syst Res Ctr, Durham, NH 03824 USA
关键词
nitrogen immobilization; mineralization; dissolved organic carbon (DOC); forest soils;
D O I
10.1016/S0038-0717(99)00186-8
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Northeastern forest are generally considered to be nitrogen limited, even though soil microbial populations may in fact be limited by the amount of carbon required as an energy source. Field studies have shown that with increasing N availability, net mineralization rates increase initially but then decrease over time. One possible reason for a reduction in net mineralization rates is that labile soil carbon, such as dissolved organic carbon (DOC), becomes depleted. Five-week laboratory incubations of organic and mineral soil samples with different carbon amendments were performed in order to determine the effect of carbon quality on potential net nitrification and net mineralization rates. Net nitrogen immobilization was greater in soils incubated with glucose amendments than those incubated with more complex carbon compounds such as humic acid. Although this resulted in lower net mineralization rates overall, net immobilization is an indicator of immediate microbial response to the carbon substrate. Net nitrification was not detected, likely due to the short duration of the incubations. Measurements of gross mineralization rates may be necessary to see an overall effect of carbon substrate on N cycling in these soils. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:597 / 601
页数:5
相关论文
共 28 条
[1]   NITROGEN SATURATION IN NORTHERN FOREST ECOSYSTEMS [J].
ABER, JD ;
NADELHOFFER, KJ ;
STEUDLER, P ;
MELILLO, JM .
BIOSCIENCE, 1989, 39 (06) :378-386
[2]   PLANT AND SOIL RESPONSES TO CHRONIC NITROGEN ADDITIONS AT THE HARVARD FOREST, MASSACHUSETTS [J].
ABER, JD ;
MAGILL, A ;
BOONE, R ;
MELILLO, JM ;
STEUDLER, P ;
BOWDEN, R .
ECOLOGICAL APPLICATIONS, 1993, 3 (01) :156-166
[3]   PREDICTING LONG-TERM PATTERNS OF MASS-LOSS, NITROGEN DYNAMICS, AND SOIL ORGANIC-MATTER FORMATION FROM INITIAL FINE LITTER CHEMISTRY IN TEMPERATE FOREST ECOSYSTEMS [J].
ABER, JD ;
MELILLO, JM ;
MCCLAUGHERTY, CA .
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE, 1990, 68 (10) :2201-2208
[4]   NITROGEN IMMOBILIZATION IN DECAYING HARDWOOD LEAF LITTER AS A FUNCTION OF INITIAL NITROGEN AND LIGNIN CONTENT [J].
ABER, JD ;
MELILLO, JM .
CANADIAN JOURNAL OF BOTANY-REVUE CANADIENNE DE BOTANIQUE, 1982, 60 (11) :2263-2269
[5]  
Aber JD., 1991, TERRESTRIAL ECOSYSTE
[6]   DISSOLVED ORGANIC-CARBON IN OLD FIELD SOILS - TOTAL AMOUNTS AS A MEASURE OF AVAILABLE RESOURCES FOR SOIL MINERALIZATION [J].
COOK, BD ;
ALLAN, DL .
SOIL BIOLOGY & BIOCHEMISTRY, 1992, 24 (06) :585-594
[7]   SEASONAL AND ANNUAL VARIATION IN NITROGEN MINERALIZATION AND NITRIFICATION ALONG AN ELEVATIONAL GRADIENT IN NEW-MEXICO [J].
GOSZ, JR ;
WHITE, CS .
BIOGEOCHEMISTRY, 1986, 2 (03) :281-297
[8]   NUTRIENT RELEASE FROM DECOMPOSING LEAF AND BRANCH LITTER IN HUBBARD BROOK FOREST, NEW-HAMPSHIRE [J].
GOSZ, JR ;
LIKENS, GE ;
BORMANN, FH .
ECOLOGICAL MONOGRAPHS, 1973, 43 (02) :173-191
[9]   DYNAMICS OF GROSS NITROGEN TRANSFORMATIONS IN AN OLD-GROWTH FOREST - THE CARBON CONNECTION [J].
HART, SC ;
NASON, GE ;
MYROLD, DD ;
PERRY, DA .
ECOLOGY, 1994, 75 (04) :880-891
[10]   EFFECTS OF STEM GIRDLING ON BIOGEOCHEMICAL CYCLES WITHIN A MIXED DECIDUOUS FOREST IN EASTERN TENNESSEE .2. SOIL-NITROGEN MINERALIZATION AND NITRIFICATION RATES [J].
JOHNSON, DW ;
EDWARDS, NT .
OECOLOGIA, 1979, 40 (03) :259-271