Soil microbial biomass : an estimator of soil development in reclaimed lignite mine soil /
(FE), and substrate-induced respiration (SIR)] were used to
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | (FE), and substrate-induced respiration (SIR)] were used to 5-, 10-, 15-, and 23-year-old reclaimed mixed overburden as A two-year study was conducted at the Big Brown lignite mine activity; qCO2; C02 produced per unit mass of SMB), and the affected by seasonal influences, and changes at these sites appeared more related to changes in soil moisture. basal respiration and soil organic carbon (SOC) accretion was C02-C Mg SMBC d-' during the first year and tended to during mid to late summer and declined to a minimum during evaluated using the respiratory quotient (qCO2) and the ratio fluctuations of SMB that correlated well with the growing fumigation incubation (FI), chloroform fumigation extraction in Fairfield, Texas, to determine the rate and extent of measure SMB and compared as estimators of SMB in reclaimed mine soils. Basal respiration (CO2 evolved from untreated of SMB from 12 sample dates ranged from 41 pg SMIBC g-1 at of the SMB to SOC (SMBC:SOC ratio). Newly leveled, 1-, 3-, Older sites (15- and 23-years) showed significant overburden. The relationships between SMB carbon (SMBC), period of the study. The qCO2 declined from 0.24 to 0. 12 Mg ratios of SMBC:SOC increased linearly with age of site recovery of the soil microbial biomass (SMB) in mixed relative to SOC accumulation. A nearly linear increase in SMB season of Coastal bermudagrass. Microbial biomass peaked SMBC:SOC ratio (the abundance of SMB relative to SOC) were SMIBC and other parameters. Three methods [chloroform soil), metabolic quotient (i.e. specific respiratory stabilize near 0.06 to 0.09 as reclaimed sites matured. The the 0-year site to 291 ptg SMBC g-' at the 23-year site. The the cold, wet winter months. Younger sites were less through 23 years (r--O. 97). A substantial amount of seasonal to 0.99) for each of the three biomass methods. Mean values unmined reference soil averaged 84 jig SMBC g-1 through the used to determine trends in microbial biomass dynamics variation in SMB was observed during the two-year study. was observed over the chronosequence of mine soils (r--O.98 well as an unmined soil were sampled bimonthly to measure |
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| Item Description: | "Major subject: Soil Science". Vita. |
| Physical Description: | xi, 110 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references: pages 86-95. |