ISSN:
1573-5117
Schlagwort(e):
Growth characteristics
;
heterotrophic bacterial population
;
trophic gradient
;
fertilizers
;
physico-chemical factors
;
water-bottom sediments
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
Notizen:
Abstract Treatment of single and double doses of fertilizers had a definite response on the bacterial population of water and bottom sediments in tanks after 7 days (F2,21 ⩾ 3.61; P 〈 0.05), but did not cause any significant change after day 32 (F2,18 ⩽ 1.67; P 〉 0.05). Although the generation time of water bacteria did not vary much in these treatments of trophic gradients (P 〉 0.05), there was always a distinct variation (P 〈 0.01) in the generation time of the bacterial population of bottom sediments. The population size of water bacteria was shown to maintain an inverse relationship with the diurnal variation of temperature (P 〈 0.05) and dissolved oxygen (P 〈 0.05) of the water. The changes in the size of the bacterial population of water were positively correlated with the variations of hardness (P 〈 0.05), chloride (P 〈 0.05) and ammonia nitrogen (P 〈 0.05) of water. Although the relationships between the heterotrophic bacterial population and the inorganic phosphate of water was not convincing (P 〉 0.05), an inverse relationship was established between the bacterial community of bottom sediments and the phosphate content of the water (P 〈 0.01).
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00006487
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