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| 11. |
Sediment, phosphorus, and nitrogen in channelised surface run‐off from a New Zealand pastoral catchment |
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New Zealand Journal of Marine and Freshwater Research,
Volume 21,
Issue 4,
1987,
Page 627-639
ChristineM. Smith,
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摘要:
Surface run‐off derived from 94 m (20°) and 230 m (15°) long hillslopes in a pastoral catchment was collected along a 15.8 m total intercepting face between 1 July 1983 and 31 March 1985; run‐off subsamples were analysed chemically. Surface run‐off occurred on 49 occasions, these “events” ranging from 0.2 to 115 m3. About 50% of the total run‐off occurred in six events. In 20 months the eight individual 1.5–2.4 m long collectors intercepted 4–333 m3of water. This uneven spatial run‐off pattern, the measured flow rates, and total event volumes indicated that extensive areas on both hillslopes produced run‐off, and that extreme channelisation occurred during movement downslope. Mean flow weighted run‐off concentrations were for total phosphorus (TP) 1053 mg/m3, total dissolved phosphorus (TDP) 300 mg/m3, Kjeldahl nitrogen (TKN) 5898 mg/m3, dissolved Kjeldahl nitrogen (DKN) 1413 mg/m3, NO3‐N 69 mg/m3, suspended sediments (SS) 472 g/m3, and volatile suspended sediment (VSS) 115 g/m3. Estimated catchment surface run‐off yields in 1984 were: TP 0.75 kg/ha, TDP 0.15 kg/ha, TKN 4.43 kg/ha, DKN 0.74 kg/ha, NO3‐N 0.03 kg/ha, SS 374 kg/ha, and VSS 90 kg/ha. Virtually all phosphorus and nitrogen was transported downslope in winter and spring. Controlling these run‐off nutrient inputs to the catchment stream is briefly discussed.
ISSN:0028-8330
DOI:10.1080/00288330.1987.9516268
出版商:Taylor & Francis Group
年代:1987
数据来源: Taylor
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| 12. |
The relationship between eye diameter and fork length in the spiny oreo dory,Allocyttussp. (note) |
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New Zealand Journal of Marine and Freshwater Research,
Volume 21,
Issue 4,
1987,
Page 641-642
S. A. Crane,
J. M. Fenaughty,
R. W. Gauldie,
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摘要:
A regression analysis of eye diameter and fork length was conducted on measurements from 143 spiny oreo dories,Allocyttussp. (Oreosomatidae). A statistically significant relationship between eye diameter (x) and fork length (y) was found:y= 131 + 3.56.x (r = 0.811).
ISSN:0028-8330
DOI:10.1080/00288330.1987.9516269
出版商:Taylor & Francis Group
年代:1987
数据来源: Taylor
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| 13. |
Downstream migration ofGeotria australisjuveniles in the lower Waikato River (note) |
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New Zealand Journal of Marine and Freshwater Research,
Volume 21,
Issue 4,
1987,
Page 643-644
PerryW. Empson,
AdrianS. Meredith,
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摘要:
Juvenile migrants ofGeotria australiswere caught from July to early August 1986 in plankton nets set in the lower Waikato River. Migration occurred only at night and mainly mid‐river at the surface. The mean lengths and weights (± 95%c.i.) were 107.75 ± 3.98 mm and 0.94 ± 0.08 g respectively.
ISSN:0028-8330
DOI:10.1080/00288330.1987.9516270
出版商:Taylor & Francis Group
年代:1987
数据来源: Taylor
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| 14. |
Book reviews |
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New Zealand Journal of Marine and Freshwater Research,
Volume 21,
Issue 4,
1987,
Page 645-649
PatriciaI. Dixon,
P. M. Hine,
R. J. G. Lester,
R. M. McDowall,
Mike Winterbourn,
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ISSN:0028-8330
DOI:10.1080/00288330.1987.9516271
出版商:Taylor & Francis Group
年代:1987
数据来源: Taylor
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