谷氨酰胺对肉仔鸡早期生长和组织器官发育的影响

在肉仔鸡基础日粮中添加谷氨酰胺进行 2 1d的试验 ,观察了其对肉仔鸡早期生长性能和组织器官发育的影响。试验表明 ,在肉仔鸡饲料中添加适宜的谷氨酰胺 ,有利于提高肉仔鸡的体重、日增重、饲料报酬和成活率 ,添加量为 0 .8%时效果最好 ,且谷氨酰胺添加量为 0 .8%时可明显提高 2 1日龄时法氏囊、脾脏、肝脏和胰腺的重量以及法氏囊指数。     

陕西镇巴火焰溪法门阶牙形刺研究

陕西镇巴火焰溪剖面位于大巴山西段，临近川陕交界、交通便利。那里晚泥盆世地层出露完好，层序清楚，化石丰富。本文就该剖面法门阶牙形刺动物群、泥盆系石炭系的界线进行了研讨，建立了该区法门阶的两个浅水相牙形刺生物组合带。     

东江鲤鱼的生物学

东江鲤鱼年轮形成时期主要在2～8月,生长特点可用von Bertalanffy生长方程L_t=851[1-e~(-0.133(t+0.0394))]、W_t=19171.5[1-e~(-0.173(t+0.0394))]~3来表达;怀卵量3.1～63.563.5万粒,怀卵量与体长、体重的关系分别为F=5.14×10~(-2)L~2.6176、F=17905.43+138.86W;食物组成周年变化不明显。结合生物学资料,讨论了东江鲤鱼资源合理利用问题,提出最小捕捞年龄应在2龄以上,捕捞强度F=0.35左右。     

东川拖布卡金矿矿化层位与找金方向

超大型拖布卡金矿的发现,表明东川地区具备找金前景.“黑层”是金的成矿前提,断裂加蚀变是成矿必备条件,基性与中性岩脉在容矿层中的侵位,是找富金的重要标志.金成矿全过程应是多旋回（晋宁、华力西、燕山、喜马拉雅山）成矿作用,且受剪切破碎带控制的黑层型金矿.     

Nature of the Precambrian metamorphic blocks in the eastern segment of Central Tianshan: Constraint from geochronology and Nd isotopic geochemistry

The Central Tianshan Tectonic Zone (CTTZ) is anarrow domain between an early Paleozoic southernTianshan passive continental margin and a late Paleo-zoic northern Tianshan arc zone, which is character-ized by the presence of numerous Precambrian meta-morphic basement blocks. Proterozoic granitoidgneisses and metamorphic sedimentary rocks,namely Xingxingxia and Kawabulag and Tianhugroups, are the most important lithological assem-blages in these metamorphic basement blocks, and alittle of …     

Neoproterozoic–Cambrian synsedimentary magmatism in the Central Iberian Zone (Spain): geology,petrology and geodynamic significance

Petrographic, geochemical and field studies in low grade metamorphic areas (Ciudad Rodrigo-Hurdes-Sierra de Gata domain, CRHSG, central-western Spain) show that Neoproterozoic-Lowermost Cambrian series in the Central Iberian Zone (CIZ) record two kinds of provenance sources including: (1) detrital material derived from recycled orogens and (2) a Cadomian coeval juvenile contribution that governs their isotopic signature. Evidence of magmatism contemporaneous with Neoproterozoic-Cambrian sedimentation is provided by the presence of coherent, massive volcanic rocks (metabasalts, metaandesites, and metarhyolites), volcaniclastic shales, sandstones, conglomerates and breccias. The appearance of volcanogenic lithic fragments and crystals mixed in different proportions with siliciclastic constituents and also present within calcareous components in the sedimentary succession, reinforces this evidence. Although most of the selected volcanic and volcaniclastic samples appear to show tholeiitic affinity, some of them display calc-alkaline affinity. Different trace element ratios, such as Sm/Nd, Nb/Yb and Ta/Yb, suggest a magmatic evolution in the same tectonic setting. The geochemical results reported here support the existence of an active geodynamic setting as a direct contributor to the synsedimentary and magmatic content of the Neoproterozoic–Lowermost Cambrian successions in the CIZ. In particular, the relatively high Nd _(T) values and the high range of f ^Sm/Nd ratios are consistent with an active margin during the Neoproterozoic–Early Cambrian. The existence of tectonic activity is also confirmed by the presence of synsedimentary deformation and volcanic rocks. All of these traits favour a geodynamic model in which the Iberian Cadomian segment represented in the CIZ would have been part of an active northern margin of Gondwana, with an associated magmatic arc and related basins during Neoproterozoic–Lower Cambrian times. A proposed link between the Ossa Morena and the Central Iberian Zones might account for late Cadomian pull-apart basins developed on both sides of the magmatic arc, sharing the same scenario and involving similar magmatic activity during the Neoproterozoic–Cambrian transition.

福建中亚热带天然阔叶用材林择伐技术Ⅰ.基于树种特征的目标树种清单

依据树种的最大直径、干形、枝下高、生长快慢、木材价值、保护等级等6个重要特征指标,参照各指标的标准,筛选出福建中亚热带天然阔叶用材林目标树种,共计26科62属79种,其中针叶树种15种、阔叶树种64种,优质目标树种39种、良好目标树种29种、特殊目标树种11种。     

罗布泊地区凝结水对潜卤水资源量评价的影响分析

新疆罗布泊地区属于极端干旱气候地区,大气降水对地下水的补给极其有限,长期以来,众多学者认为凝结水量是罗布泊干盐湖潜卤水的重要补给来源之一。本次通过在罗北凹地地区开展的凝结水试验,较准确地计算了其补给资源量,指出尽管研究区凝结水总生成量较大,但真正能入渗补给到潜卤水饱水带的量却极少,绝大多数凝结水都以难以开发利用的土壤水形式短暂保存,被蒸发散失到大气中,对潜卤水资源量评价影响较小。     

皖南国际旅游文化示范区文化旅游资源整合开发模式

文化旅游是当今世界旅游发展的主流,旅游与文化的关联度渗透性日益增强,如何提升旅游产品的文化内涵,是世界各地旅游业长远发展的关键问题。皖南国际旅游文化示范区包括黄山、池州、宣城、芜湖、马鞍山、铜陵六市及安庆市的潜山县,辖34个县市区,总面积38220km²,总人口1069.6万,是安徽省最具开发潜力的旅游板块,文化旅游资源的品位和富集度都很高,但是在开发过程中存在着开发层次较低、产业链条脆弱、整体旅游形象不明、缺乏王牌产品、整合开发乏力等诸多问题。通过分析示范区文化旅游资源的开发现状及问题,提出了对文化旅游资源开发进行整合的模式,即以空间为依托的地域组合模式、以市场为依托的产品整合模式、以营销为依托的形象整合模式、以产业为依托的文化与旅游互动发展模式等。