不同利用方式下草地土壤微生物及土壤呼吸特性   总被引：7，自引：0，他引：7  

郭明英  朝克图  尤金成  徐丽君  王丽娟  贾淑杰  辛晓平 《草地学报》2012,20(1):42-48

通过对呼伦贝尔羊草(Leymus chinensis)草甸草原土壤呼吸特性及土壤微生物的测定,研究了3种不同利用方式(围封、放牧和刈割)对天然草地土壤呼吸特性及土壤微生物的影响,为草甸草原土壤呼吸研究提供基础理论依据。结果表明:不同利用方式下土壤呼吸速率、土壤微生物量碳含量与土壤酶活性(除脲酶)均表现为草地围封比放牧和刈割呼吸速率高(含量高、活性强);土壤微生物量氮含量、脲酶活性和微生物数量表现为草地放牧和刈割比围封的含量高(活性强、数量多);土壤微生物量碳、氮含量、土壤酶活性(除脲酶)和土壤微生物数量均以表层(0～10cm)最高(活性最强、数量最多),随着土层深度增加而降低(活性下降、数量减少)。土壤呼吸速率与微生物量碳、土壤酶活性(除过氧化氢酶)成正相关,与微生物量氮、过氧化氢酶和微生物数量成负相关,其中只与微生物量氮相关性显著,而其余之间均不显著。  相似文献   

Pilot study of Australian veterinarians and their perceptions and experiences related to online pet health information     

LR Kogan  JA Oxley  SJ Hazel 《Australian veterinary journal》2019,97(1-2):10-13

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栽培因素对北方粳稻产量及米质的影响——第10报不同叶龄秧苗对产量及米质的影响     

李彦利  严光彬  贾玉敏  孟令君  王万成  严永峰 《北方水稻》2007,(2):32-34

通过不同秧龄秧苗对水稻生育和米质的影响试验,结果表明:插秧秧龄越大株高增高,叶龄和有效穗数增加,但千粒重有降低的趋势。3.5和4.5叶龄插秧时每穗粒数最多、产量最高。插秧秧龄大,加工品质差,外观品质变坏,但食味品质提高。  相似文献   

BOOK REVIEWS     

CP STEPHENS  JA GIBSON  PJ BLACKALL 《Australian veterinary journal》1990,67(12):466-466

Book reviewed in this article:
Guide to the Dissection of Domestic Ruminants . RE Habel
Biology and Medicine of Rabbits and Rodents . JE Harkness and JF Wagner  相似文献   

Inorganic mercury poisoning in a dog     

JA GREENWOOD  VP STUDDERT  ND SULLIVAN 《Australian veterinary journal》1990,67(11):421-422

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Porcine pleuropneumonia in Australian pigs due to Actinobacillus pleuropneumoniae serovar 5     

CP STEPHENS  JA GIBSON  PJ BLACKALL 《Australian veterinary journal》1990,67(12):462-462

Book reviewed in this article: Guide to the Dissection of Domestic Ruminants . RE Habel Biology and Medicine of Rabbits and Rodents . JE Harkness and JF Wagner  相似文献   

Giardia infection in budgerigars     

LJ FILIPPICH  PA McDONNELL  E. MUNOZ  JA UPCROFT 《Australian veterinary journal》1998,76(4):246-249

Budgerigars ( Melopsittacus undulatus ) from two different breeding colonies were found to have Giardia infection. Light microscopy, scanning electron microscopy and in-vitro and in-vivo studies confirmed the species was G psittaci . Chicks were clinically affected and showed signs of retarded growth, dehydration and diarrhoea. The faeces of adult birds treated with metronidazole in drinking water were negative for Giardia 5 days after treatment. Megabacteria were also found in adult birds but were not treated. This study extends the known host range for Giardia in Australia to include budgerigars.  相似文献   

Small Animal Paediatric Medicine and Surgery     

JA Culvenor 《Australian veterinary journal》1998,76(12):792-792

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Incidence of Gross Reproductive Abnormalities in Small East African Zebu Cattle     

Assey  R.J.  Kessy  B.M.  Matovelo  J.A.  Minga  U. 《Tropical animal health and production》1998,30(6):361-368

Reproductive organs from mature Small East African zebu (SEAZ) heifers and cows slaughtered at the Morogoro abattoir were collected twice a month and evaluated over a period of 12 months. Out of the 402 animals from which reproductive organs were taken, 54% were pregnant, 24% were actively cycling and 22% were non-cycling. Various gross abnormalities were observed in the reproductive organs of about 16% of the cattle, and the major reproductive abnormality in both total and the non-cycling animals was various degrees of fibrous adhesion between the ovary and the infundibulum and mesosalpinx. It is concluded that, contrary to common belief, a majority of the female SEAZ cattle that are slaughtered are fertile.  相似文献   

The effect of dexamethasone and promethazine in combination with buparvaquone in the management of East Coast fever     

Gwamaka M  Matovelo JA  Mtambo MM  Mbassa GK  Maselle RM  Boniphace S 《The Onderstepoort journal of veterinary research》2004,71(2):119-128

The effects of dexamethasone and promethazine on the amelioration of pulmonary oedema in East Coast fever were investigated. The clinical effects of these drugs were further investigated when used in conjunction with the antitheilerial drug, buparvaquone. In the first experiment, 15 crossbred (Friesian x Zebu) steers were divided into four groups. With the exception of the animals in group IV, that served as a control group all the others were infected with Theileria parva sporozoites. On the second day of the febrile reaction, the steers in groups I and II were treated with dexamethasone (0.1 mg/kg) and promethazine (1 mg/kg), respectively. Group III steers served as the infected untreated controls. On the fifth day of the febrile reaction the animals in groups I, II and III were infused intravenously with tattoo ink suspension and 1 h later sacrificed for post-mortem examination and tissue sampling. The clinical picture indicated that both drugs significantly mitigated dyspnoea and the post mortem examination revealed a significant reduction in morphological changes. Tattoo ink particle count reflected a significant (P< 0.01) reduction in vascular leakage in the treated animals, with promethazine being significantly (P < 0.05) more effective than dexamethasone in this respect. In the second experiment, 18 steers were infected with T. parva sporozoites, and then were randomly allotted into three groups each of which contained six animals. After the onset of ECF clinical signs, the animals in the first two groups were treated with buparvaquone in combination with either dexamethasone (group I) or promethazine (group II), and the third group was treated with buparvaquone alone. The results indicated that all the animals in groups I, II and III recovered well and no significant differences were observed in clinical disposition between the groups. Two months later, serum samples were collected from the refractory animals and demonstrated the presence of antibodies against T. parva. When the animals were subsequently artificially challenged with T. parva, none of them succumbed to clinical disease. The same T. parva stabilate stock was used in both experiments and it proved to be infective in a separate batch of steers.  相似文献