DISSOLVED ORGANIC-CARBON IN OLD FIELD SOILS - COMPOSITIONAL CHANGES DURING THE BIODEGRADATION OF SOIL ORGANIC-MATTER

被引:57
作者
COOK, BD [1 ]
ALLAN, DL [1 ]
机构
[1] UNIV MINNESOTA,DEPT SOIL SCI,ST PAUL,MN 55108
关键词
D O I
10.1016/0038-0717(92)90085-C
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The quality of soil dissolved organic carbon (DOC) was examined using the Leenheer DOC fractionation scheme, which separates soluble organic compounds into well-defined functional groups that exhibit similar reactive properties. DOC fractions were measured for five previously cultivated old fields undergoing secondary succession, and an undisturbed oak savanna. Despite differences in field age (time since abandonment), plant community composition, distribution and amounts of phytomass, C and N storage, and potential amounts of CO2-C and net-N mineralization, the quality of soil DOC did not appear to differ. Nearly all DOC occurred in acid fractions (77%); hydrophilic acids alone constituted 50%. The fractionation procedure was also performed at four different times during a 210-day regulated in vitro incubation of the soils. Despite decreasing mineralization response to soil DOC concentrations, the fractional composition of the DOC remained relatively constant throughout the incubation. Although we could not evaluate DOC utilization, the results demonstrated that soil DOC was altered during the decomposition of soil organic matter; both total amounts and the relative N content of the hydrophobic acid fraction increased during the incubation period.
引用
收藏
页码:595 / 600
页数:6
相关论文
共 21 条
  • [1] THE WEATHERING OF A LATE TERTIARY VOLCANIC ASH - IMPORTANCE OF ORGANIC SOLUTES
    ANTWEILER, RC
    DREVER, JI
    [J]. GEOCHIMICA ET COSMOCHIMICA ACTA, 1983, 47 (03) : 623 - 629
  • [2] AZHAR E, 1986, PLANT SOIL, V94, P369, DOI 10.1007/BF02374331
  • [3] Brown C. M., 1982, Experimental microbial ecology, P154
  • [4] DISSOLVED ORGANIC-CARBON IN OLD FIELD SOILS - TOTAL AMOUNTS AS A MEASURE OF AVAILABLE RESOURCES FOR SOIL MINERALIZATION
    COOK, BD
    ALLAN, DL
    [J]. SOIL BIOLOGY & BIOCHEMISTRY, 1992, 24 (06) : 585 - 594
  • [5] ORGANIC-CARBON FRACTIONS IN EXTRACTS OF O AND B HORIZONS FROM A NEW-ENGLAND SPODOSOL - EFFECTS OF ACID TREATMENT
    DAVID, MB
    VANCE, GF
    RISSING, JM
    STEVENSON, FJ
    [J]. JOURNAL OF ENVIRONMENTAL QUALITY, 1989, 18 (02) : 212 - 217
  • [6] THE EFFECT OF ADDED NITROGEN ON THE RATE OF DECOMPOSITION OF ORGANIC-MATTER
    FOG, K
    [J]. BIOLOGICAL REVIEWS, 1988, 63 (03) : 433 - 462
  • [7] GOODALL D. W., 1978, ORDINATION PLANT COM, P99
  • [8] GOURLEY CJP, 1989, AGRONOMY ABSTRACTS, P216
  • [9] HUNT HW, 1978, GRASSLAND SIMULATION, P156
  • [10] OLD-FIELD SUCCESSION ON A MINNESOTA SAND PLAIN
    INOUYE, RS
    HUNTLY, NJ
    TILMAN, D
    TESTER, JR
    STILLWELL, M
    ZINNEL, KC
    [J]. ECOLOGY, 1987, 68 (01) : 12 - 26