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RECORD NUMBER: 324 OF 824| Main Title | Effects of Divalent Metal Chlorides on Respiration and Extractable Enzymatic Activities of Douglas-Fir Needle Litter. | |||||||||||
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| Author | Spalding, Brian P. ; | |||||||||||
| CORP Author | National Heart, Lung, and Blood Inst., Bethesda, MD. | |||||||||||
| Year Published | 1979 | |||||||||||
| Report Number | EPA-600/J-79-109; | |||||||||||
| Stock Number | PB81-106064 | |||||||||||
| Additional Subjects | Carbon dioxide ; Metals ; Fir trees ; Pollution ; Mercury(Metal) ; Cadmium ; Lead(Metal) ; Nickel ; Zinc ; Copper ; Chlorides ; Respiration ; Enzymes ; Reprints ; Pseudotsuga menziesii ; Water pollution effects(Plants) | |||||||||||
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| Collation | 8p | |||||||||||
| Abstract | The rates of CO2 evolution from Douglas-fir (Pseudotsuga menziesii Franco) needle litter, following application of divalent metal (Hg, Cd, Pb, Ni, Zn, and Cu) chlorides at rates of 10, 100, and 1,000 microgram/g and Ca chloride at 7, 68, and 683 microgram/g were monitored at 2- to 3-day intervals for 4 weeks; extractable enzymatic activities, were also measured on additional samples 1 day, 2, and 4 weeks following treatment. All metals except Pb inhibited respiration when applied at the highest level. Cellulase activity was depressed by treatment of 1,000 microgram/g of either Hg or Cd after 4 weeks but was not affected initially (1 day after). After 4 weeks, xylanese activity was also depressed by the 1,000-microgram/g Hg treatment. Apparently these enzymatic activities declined due to decrease enzyme synthesis associated with inhibited microbial growth rather than by direct enzymatic inhibition. | |||||||||||
| Supplementary Notes | Pub. in Jnl. of Environmental Quality, v8 n1 p105-109 1979. | |||||||||||
| NTIS Title Notes | Journal article. | |||||||||||
| Title Annotations | Reprint: Effects of Divalent Metal Chlorides on Respiration and Extractable Enzymatic Activities of Douglas-Fir Needle Litter. | |||||||||||
| PUB Date Free Form | 1979 | |||||||||||
| Category Codes | 2F; 68D; 48D | |||||||||||
| NTIS Prices | PC A02/MF A01 | |||||||||||
| Primary Description | 600/02 | |||||||||||
| Document Type | NT | |||||||||||
| Cataloging Source | NTIS/MT | |||||||||||
| Control Number | 323786435 | |||||||||||
| Origin | NTIS | |||||||||||
| Type | CAT |