GIS APPLICATION IN RESEARCH OF WILDLIFE HABITAT CHANGE——A case study of the Giant Panda in Wolong Nature Reserve

Ｉ.ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅＧｉａｎｔＰａｎｄａ(Ａｉｌｕｒｏｐｏｄａｍｅｌａｎｏｌｅｕｅａ)ｉｓａｎｅｎｄａｎｇｅｒｅｄａｎｉｍａｌｓｐｅｃｉｅｓｉｎｔｈｅｗｏｒｌｄ.Ｔｈｅｒｅａｒｅａｂｏｕｔ1000ｉｎｄｉｖｉｄｕａｌｓｌｅｆｔａｎｄｃｏｎｆｉｎｅｄｉｎｔｈｅｉｓｏｌａｔｅｄｍｏｕｎｔａｉｎａｒｅａｓｉｎｔｈｅｓｏｕｔｈｗｅｓｔｅｒｎｐａｒｔｏｆＣｈｉｎａ.Ｉｔｓｒｅｍａｉｎｉｎｇｈａｂｉｔａｔｃｏｖｅｒｓａｂｏｕｔ29,500ｋｍ2[2,6,11].Ｈｕｍａｎｅｎｃｒｏａｃｈｍｅｎｔｉｓｃｏｎｓｉｄｅｒｅ…     

On the problem of boundary conditions in isentropic coordinates

The main advantages of constant potential enthalpy as a vertical coordinate are weaker horizontal velocity gradients in frontal regions and a higher vertical resolution. A disadvantage is the intersection of isentropes with the ground and folding of these surfaces. A numerical model is proposed to overcome the difficulties imposed by the intersection of isentropes with the ground. The model contains a physical and computational domain. The top and bottom surfaces of the computational domain are isentropes whereas the physical domain of the flow confined above by a free surface of constant pressure, and the bottom of this domain is the surface of the earth. In the present study the top surfaces of these two domains coincide (θ _T, P_Tare constants in space and time). The model was tested for the study of frontogenesis and cyclogenesis and integrated for 7 days. The results correspond to enstrophy-conserving finite difference scheme.     

河南禹州铝土矿“三位一体”找矿模型及资源潜力

禹州铝土矿位于华北地台西南部的嵩箕台隆南缘，嵩箕铝土矿成矿区.该区具有明显的地台型基底和盖层二元结构，基底由古元古界嵩山岩群构成，盖层系较标准的地台型沉积，由一套古生界海相碎屑岩-碳酸盐岩建造，古生界海陆交互相含铝、煤建造和陆相碎屑岩建造组成.通过对该区铝土矿控矿因素及找矿标志分析，建立了该区铝土矿找矿模型，并对该区铝土矿的资源潜力进行了评价.     

鄂尔多斯盆地盐池-定边地区水化学场分布特征及形成机理

鄂东南矿集区殷祖岩体南部的刘家垄矿区，勘探线和钻孔显示刘家垄铜矿体主要倾向南、南西，受到毛铺-两剑桥东西断裂带的构造控制.矿体主要集中在石英闪长岩体与志留系碎屑岩接触交代部位，在岩体内侧赋存成矿.矿化类型主要有黄铜矿化石英闪长岩和含黄铜矿石英脉.围岩主要为钾化石英闪长岩和角岩化的粉砂岩.通过对比区域上的成矿类型，刘家垄脉状铜矿与斑岩型有关，即斜长石和石英为造岩矿物，可见绿泥石、方解石等蚀变矿物.矿化主要发生在夕卡岩化石英闪长岩带.通过总结成矿规律，认为有利的勘探区段在断裂构造发育、岩体与碎屑岩接触部位的岩体一侧.     

CFCs及其代用品的全球增温潜能

本文用一维辐射·对流模式系统地研究了现有含氯氟烃气体(CFCs)及其可能代用品的辐射强迫、比地面增温效应和全球增温潜能(GWP).结果发现:大多数提议的代用品的GWP值明显小于现有的CFCs.这主要归因于:(1)它们所产生的辐射强迫和比地面增温效应较小,一般只有CFCs的50％—60％;(2)其大气寿命比CFCs短得多.     

玉米潜在产量与积温关系模型及其应用

依据于物质积累的基本规律,用包括早、中、晚熟和紧凑、平展两类株型的10个玉米杂交种在北京、延庆、泰安、公主岭、石河子5个不同气候类型地区的试验观察数据,模拟出玉米的标准生长函数W=[1+e~(3.56-13.52μ)]~(-1)。据此建立潜在生物量与品种所需积温的关系:B_(max)/kg·亩~(-1) =100+1.1∑T_m。用此模式估算了不同熟性品种的潜在产量,讨论了模拟结果在气候变化影响评价中的应用。     

LOCAL POTENTIAL AND PRINCIPLE OF VORTICITY CONSERVATION

In this paper,the local potential of nondivergent flow on beta plane is derived from the motion equa-tion.The conservation principle for vorticity is obtained when the local potential tends to be minimumwith the variational technique.Some other properties st,ch as Lagrangian of vorticity equation,energyetc.are also discussed briefly in the paper.     

POTENTIAL VORTICITY STRUCTURE OF SUMMER CYCLONES OVER THE CHANGJIANG-HUAIHE VALLEY

Based on the theory of Ertel potential vorticity,the isentropic potential vorticity maps and vertical pro-files of potential vorticity for two summer cyclones over the Changjiang-Huaihe Valley are analysed.Afterdiscussing a possible mechanism for the genesis and development of such systems and their differences fromtypical extratropical cyclones,a conceptual model for their activities is proposed:A weak disturbance in the mid-level of troposphere originated from around the Qinghai-Xizang Plateau may cause heavy precipitation underfavourable conditions and latent heat release in the mid-troposphere leads to downward extension of cycloniccirculation and a wave on the quasi-stationary front.This weak cyclone can develop substantially and becomea typical extratropical cyclone only when air from the lower stratosphere flows downslope along isentropic sur-faces into the region of interest.