土壤动物对鄱阳湖湿地冬季凋落物分解过程的影响   总被引：1，自引：0，他引：1  

肖玲  马燕天  甘志伟  蔡润发  李卓琳  葛刚  吴兰 《湖泊科学》2020,32(2):395-405

为了研究湿地土壤动物对凋落物分解速率以及对土壤养分归还的影响,于2017年11月份在鄱阳湖湿地收集苔草(Carex cinerascens)、南荻(Triarrhena lutarioriparia)和芦苇(Phragmites australis) 3种植物的凋落物,利用凋落物袋法开展原位的模拟实验研究中使用了网孔大小分别为4.5 mm(大)和0.1 mm(小)的分解袋来对比分析土壤动物的影响结果表明:不同物种之间凋落物分解速率有差异,苔草的分解速率显著大于南荻和芦苇,南荻与芦苇的分解速率差异不明显;凋落物的分解速率与凋落物总有机碳和总氮的积累量(NAI_(TOC)/NAI_(TN))呈负相关,与残余凋落物质量呈负相关,与凋落物总磷含量呈正相关;凋落物总氮含量在不同物种凋落物中差异明显,表现为苔草芦苇南荻,并且与分解速率的大小关系相对应,因此高氮植物凋落物的分解速率较快;土壤动物能够提高分解速率,促进凋落物营养元素的释放,进而调节凋落物中C、N、P元素向土壤养分库的归还过程本研究将为湿地生态系统的营养元素循环研究提供科学数据.  相似文献   

Abrupt changes of radiolarian fauna at 600 and 120 ka B. P. in the southern South China Sea and their paleoceanographic implications     

Wang Rujian  Andrea Abelmann 《海洋学报(英文版)》2000,19(3):131-138

IWr~IOXThe Nansha Islands area of the mouth China Sea is located at the margin of the West Pacificwarm POOl. Its variations in physical and chemical properties, namely, the stability of the WestPacific warm afl, involve the global climatic changes, for instance, EI Nino events caused theglobal climatic anomaly in the recent years and evolution of East Asian mourn. Therefore thearea is of imPOrtance for the global climatic changes. Recently recovered deep-sea sediment coresfrom the are…  相似文献   

Zinc in Fish, Crabs, Oysters, and Mangrove Flora and Fauna from Cleveland Bay   总被引：1，自引：0，他引：1  

G.B Jones  P Mercurio  F Olivier 《Marine pollution bulletin》2000,41(7-12):345-352

Zinc in muscle tissue from 28 species of fish, three species of sharks and rays, two species of squid and cuttlefish, and three species of crustacea collected from Cleveland Bay, together with some measurements made on oysters and mangrove flora and fauna are reported. In the fish species the mean Zn concentration in muscle tissue was 4.83 ± 2.82 μg/g wet weight, slightly lower than zinc measurements (7 μg/g wet weight) made in 14 fish species collected from the bay in 1975. Zinc in sharks and rays ranged from 3.5 to 7.2 μg/g wet wt, in squid and cuttlefish 13–16 μg/g wet wt, and in crustacea levels ranged from 14 to 18 μg/g wet wt. Zinc levels in fish varied between species with concentrations well below the ANZECC Maximum Residue Limit of zinc in seafood (150 μg/g wet wt). Although lower zinc concentrations were found in oysters collected from the Townsville Harbour area (2080 μg/g wet wt), compared with previous measurements made 25 years ago at this site, these levels are still above the Maximum Residue Limit for zinc in oysters (1000 μg/g wet wt). Concentrations of zinc in oysters from Orpheus Island (2547 μg/g wet wt), about 74 km away from industrial and urban activity, are also above the safe guideline values. Horseshoe Bay oysters transplanted to Ross Creek accumulated zinc at a rate of about 100 μg/g of oyster tissue per week, suggesting that dissolved zinc levels at this site are elevated, and that oysters rapidly accumulate zinc. Highest concentrations of zinc in mangrove leaves (30–65 μg/g dry wt) occurred in Osbornia octodonta, Exocaria agalocha, and Aegialitus annulata, compared with Ceriops tagal, and Avicennia marina (5–10 μg/g dry wt). No significant difference in zinc concentration occurred between leaves and litter fall for most of these species, with the sole exception of Exocaria, which showed almost a twofold increase in concentration. In seven species of mangrove fauna levels of zinc were very uniform and close to 50 μg/g (dry wt) Telescopium telescopium from the mouth of the Ross Estuary was the exception with levels at 400 μg/g (dry wt).  相似文献   

The tidal exchange of Callianassa californiensis (Crustacea,Decapoda) larvae between the ocean and the Salmon River estuary,Oregon     

Gary E. Johnson  J.J. Gonor 《Estuarine, Coastal and Shelf Science》1982,14(5):501-516

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Environmental patchiness,litter decomposition and associated faunal patterns in a Spartina alterniflora marsh     

Seth R. Reice  Alan E. Stiven 《Estuarine, Coastal and Shelf Science》1983,16(5):559-571

Spartina alterniflora leaf litter bundles were placed in a North Carolina salt marsh to study the effects of environmental heterogeneity on decomposition and animal colonization. Sediment type (mud vs. sand), tidal inundation zone (near bay, mid-marsh and upper marsh) and Spartina growth form (tall vs. short) were studied. Tidal zone had the greatest effect on decomposition rate. The main effects of sediment type and growth form were not significant. All treatments affected animal distribution patterns in the leaf bundles. Nearly all common taxa were more common on mud than sand. Most taxa showed a strong association with one tidal zone. Half of the taxa were associated with one of the Spartina growth forms. Many interactions among the treatments were also significant.This study demonstrates the significance of environmental heterogeneity in a Spartina marsh both for litter decomposition and animal distributions.  相似文献   

大连茶叶沟古脊椎动物群的发现及其意义     

王敏成 《国土资源》1990,(4)

大连茶叶沟洞穴堆积物中含有脊椎动物化石6属、6种,时代为晚更新世。该脊椎动物群明显地反映了华北脊椎动物群和东北脊椎动物群的过渡性质,它对研究动物的迁徙、地层对比以及大连地区第四纪地层划分具有意义。人工打击过的骰骨和置问号的大连智人的发现更为重要。  相似文献   

The effects of prolonged aquatic macrophyte senescence on the biology of the dominant fish species in a southern African coastal lake     

A.K. Whitfield 《Estuarine, Coastal and Shelf Science》1984,18(3):315-329

The littoral zone of Swartvlei, an estuarine lake on the southern Cape coast, was characterized by extensive beds of submerged aquatic macrophytes. May 1979 marked the beginning of a regression phase which lasted more than three years. The senescence of the Potamogeton pectinatus and charophyte beds resulted in a 60% decline in primary production, a 74% slump in littoral invertebrate biomass and a 54% decline in the abundance of the fishes Monodactylus falciformis (Lacepede) and Rhabdosargus holubi (Steindachner) associated with the macrophytes. Gravimetric and calorific analyses of their food revealed that invertebrates and filamentous algae from the littoral zone were of major importance. The two fish species consumed approximately 2% of the primary production during the Potamogeton canopy phase and 3% during the Potamogeton senescent phase. Invertebrate consumption declined from 33 mg m^?2 day^?1 during the canopy phase to 8 mg m^?2 day^?1 during the senescent phase. The disappearance of the Potamogeton and charophyte beds also resulted in a decrease in the condition of both species but the effect was indirect and related mainly to the collapse of invertebrate stocks associated with the plants.  相似文献   

山东济宁煤田(东区)太原组小有孔虫生物地层   总被引：1，自引：2，他引：1  

蒋汉朝  王明镇  张锡麒  李增学 《地层学杂志》2001,25(3):174-181,T001,T002

通过对山东济宁煤田 (东区 )太原组小有孔虫动物群的系统研究 ,共鉴定出小有孔虫化石 2 8属 15 5种。根据小有孔虫化石在地层中的分布和垂向的变化规律自上而下建立了 3个小有孔虫组合 : .Tetrataxis parviconi-ca- N odosaria longa- Geinitzina spandeli组合 , .Echinonodosaria echinata- Glomospira regularis组合 , .Bradyi-na sphaeroidea- Palaeotextularidae组合。通过与邻区及华北部分地区的对比 ,本区太原组小有孔虫动物群的地质时代应为早二叠世早期 ,本区石炭系 -二叠系界线应置于太原组第十一层灰岩之底  相似文献   

新疆乌伦古河地区第三纪哺乳动物群初析及地层年代确定   总被引：14，自引：4，他引：14  

叶捷  吴文裕  孟津 《地层学杂志》2001,25(4):283-287

新疆准噶尔盆地北缘乌伦古河地区第三纪含有 7个哺乳动物群 :可可买登动物群 ,哈拉玛盖动物群 ,索索泉组顶部动物群 ,索索泉动物群 ,索索泉组底部 990 0 5动物群 ,铁尔斯哈巴合动物群和乌伦古河动物群。依据动物群分析初步确定 5个岩石地层单元的地质时代分别为 :可可买登组——中中新世晚期 ;哈拉玛盖组——中中新世早期 ,索索泉组——最早中新世至早中新世最晚期或中中新世最早期 ;铁尔斯哈巴合组——晚渐新世 ;乌伦古河组——早始新世至早渐新世。  相似文献   

Biomotoring groundwater contamination: Application to a karst area in Southern France   总被引：1，自引：0，他引：1  

Florian Malard  Jacques Mathieu  Jean-Louis Reygrobellet  Michel Lafont 《Aquatic Sciences - Research Across Boundaries》1996,58(2):158-187

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