Inoculation withGlomus mosseae improves N2 fixation by field-grown soybeans

Summary A field study carried out in a sandy, relatively acid Senegalese soil with a low soluble P content (7 ppm) and low vesicular-arbuscular mycorrhizal (VAM) populations showed that soybean responded toGlomus mosseae inoculation when the soluble P level in the soil had been raised by the addition of 22 kg P ha^–1. In P-fertilized plots, N₂ fixation of soybean, assessed by the A value method, was 109 kg N₂ fixed hat when plants were inoculated withRhizobium alone and it reached 139 kg N₂ fixed ha^–1 when plants were dually inoculated withRhizobium andGlomus mosseae using an alginate bead inoculum. In addition to this N₂ fixation increase (+28%),Glomus mosseae inoculation significantly improved grain yield (+13%) and total N content of grains (+16%). This success was attributed mainly to the low infection potential of the native VAM populations in the experimental site. In treatments without solubleP or with rock phosphate, no effect of VAM inoculation was observed.     

发展我国鲟鱼业的探讨

本文在回顾了国内外鲟鱼业的现状与进展之后,根据我国的鲟鱼资源和优越的自然条件,并借鉴国外发展鲟鱼业的经验,论证了我国有发展鲟鱼业的巨大潜力,探讨了长江等主要水系及大型水库、湖泊养殖鲟鱼的必要性与可行性,对发展我国鲟鱼业提出了一些有益的建议。     

武汉地区克氏原螯虾的生物学研究

克氏原螯虾是从国外移植的一种大型淡水虾类,目前在国内许多省市均有出产。本文根据在武汉地区对其生物学特性的研究结果指出:该虾夜间活动和觅食,白天常藏于洞穴中,少数在草丛中栖居。体长4厘类以上的个体的主要食物为水生高等植物、丝状藻类和植物碎片;次要食物为水生昆虫及其幼虫,偶然性食物为硅藻以及鱼类和蛙类的病残个体或死尸。I~ 龄虾的体长生长快,雌体达V~ 龄、体长达11.49厘米和雄体达Ⅲ~ 龄、体长达10.90厘米后,体长生长减慢,体重剧增。雌雄个体比为1.00:1.10,均在Ⅲ龄达性成熟。雌体产卵期一般在10月份,4-5月份也可见少数产卵个体。最小产卵个体6.95厘米。雌体长6.95-11.00厘米个体的产卵数变动在80-267粒。     

Seasonal changes of azimuthal,radial, and tree-to-tree variations in sap flux affect stand transpiration estimates in a <Emphasis Type="Italic">Cryptomeria japonica</Emphasis> forest,central Taiwan

Stand transpiration (E) estimated using the sap flux methods is affected by the azimuthal, radial, and tree-to-tree variations of sap flux. Although several studies have examined the relative importance of the three variations in estimating E, the seasonality of the three variations remains unknown. In the current study, we attempted to clarify whether the relative importance of these three variations could show seasonal changes. Using sap flux data measured in a subtropical cloud forest from August 2010 to July 2011, we calculated the differences resulting from omitting the three variations in estimating E. The effects of the three variations in estimating E showed seasonality. The azimuthal and tree-to-tree variations were more pronounced during winter, whereas the radial variation was more pronounced during summer. However, the effect of tree-to-tree variation was consistently much larger than the other two variations throughout the study period. The tree-to-tree variation is more important in estimating E monthly, seasonally and annually than both the azimuthal and radial variations, although all three variations have shown seasonality. In addition, the sensor allocation for summer would be acceptable for the practical estimation of E if aiming at the long time scale.     

宿鸭湖水库的浮游生物区系

宿鸭湖水库是河南省平原区的一座大型水库。面积113.33 Km~2,平均水深1.4m、透明度11cm。从1986年1～11月对该库浮游生物采样调查,共采到浮游植物8门、27科、44属、其中绿藻门有17属、蓝藻门有10属、硅藻门有8属、黄藻门1属1个种类;浮游动物66属,其中原生动物13种,轮虫28种,枝角类18种,桡足类7种。浮游植物生物量平均1.08mg/L,其中蓝藻占15.8×10~(-2),隐藻占27.4×10~(-2),甲藻占1.6×10~(-2),金藻占4.5×10~(-2),硅藻占16.9×10~(-2),裸藻占35.6×10~(-2),绿藻占12.3×10~(-2)。浮游动物量平均3.60 mg/L,其中原生动物占2.89×10~(-2),轮虫占3.36×10~(-2),枝角类占77.98×10~(-2),桡足类占15.77×10~(-2)。初步探讨了浮游植物,浮游动物变化的若干规律。     

Right atrial chromaffin paraganglioma in a dog

Cardiac neoplasia is relatively uncommon in canine patients, with the most common neoplasms including right atrial hemangiosarcoma and paragangliomas occurring at the heart base (i.e. chemodectomas or aortic body tumors). Intracardiac paragangliomas are rare neoplasms in humans and have seldom been documented in the veterinary literature. This report describes the clinical course and histopathological findings in an adult canine patient with an intracardiac chromaffin paraganglioma (non-adrenal pheochromocytoma) of the right atrium.