明水县后备水源地实施的可行性论述

一、区域地质背景 （一）自然地理 明水县位于黑龙江省西南部,松嫩平原西北部,属绥化地区。研究区地处松嫩平原东北部,地面高程170m～230m,总体地势是北高南低,地形略有起伏,其地貌类型较为单一,为岗阜状起伏台地。地质地貌主要为低漫滩和高平原。     

松嫩平原黑土区西北部阿荣旗黑土重金属分布特征、评价及预警

近年来,松嫩平原黑土区南部、东北部的一些区域已出现了重金属元素的累积,严重威胁着粮食生产安全和人体健康.为明晰黑土区西北部区域的重金属污染情况,本文以松嫩平原黑土区西北部阿荣旗为研究区,采集了32个表层黑土样品,测定As、Cd、Cr、Cu、Hg、Ni、Pb、Zn等8种重金属元素的含量,利用单因子指数法(Pi)、内梅罗综...     

松嫩平原湖泊鱼类群聚结构

根据2008-2009年的湖泊渔业资源调查,分析松嫩平原20个湖泊鱼类群聚结构特征.结果表明,20个湖泊鱼类群聚由44种鱼类组成,隶属于4目9科34属.21种鱼类的优势度指数在10000以上,17种鱼类为优势种.群聚Margalef指数(dMa值)为0.908-3.096(1.615±0.615),Simpson指数(λ值)为0.090-0.568(0.222±0.110),Gini指数(D值)为0.432-0.910(0.778±0.107),Shannon-Wiener指数(H值)为1.012-2.690(1.878±0.431),Pielou指数(J值)为0.407-0.915(0.777±0.107).dMa值与λ值、D值、H值和J值的相关系数分别为-0.670、0.665、0.867和0.340;λ值与D值、H值和J值的相关系数分别为-0.631、-0.924和-0.896;D值与H值和J值的相关系数分别为0.924和0.896;H值和J值的相关系数为-0.639.总体上,20个湖泊鱼类群聚结构处在不稳定中.     

松嫩平原地下水化学特征

根据新一轮地下水资源调查的水质资料,通过对2000多个地下水样的水质分析结果研究,发现与上世纪80年代相比,松嫩平原地下水化学类型和主要化学组分含量都发生了很大变化,农业污染严重.地下潜水硝酸根平均含量达77.03mg/L,超过Ⅳ级水质标准的样品数量占到26.9%;亚硝酸根平均含量为0.14mg/L,超过Ⅳ级水质标准的样品数量占14.53%.在主要农业区的地下潜水水化学类型中,阴离子出现硝酸型水.     

吉林省湿地资源保护与恢复

<正>吉林省位于我国东北地区中部,其东部的长 白山区,森林繁茂、水量充沛、河网稠密,为松 花江、图们江、鸭绿江的三江之源;西部的松嫩 平原,平坦辽阔、水草丰盛、湖泡棋布,是鹤、     

五大连池世界地质公园

五大连池世界地质公园位于黑龙江省中北部,地处小兴安岭山地向松嫩平原的转换地带,曾在200多万年到280年前相继喷发形成了井字形排列的14座层状火山和28座盾形火山高低错落、姿态迥异。五个汐水相连串珠状湖泊与星罗棋布的泉、溪、池、河,是新期火山岩浆填塞了浩瀚的远古凹陷盆地湖乌德林池而形成,五大连池也因此而得名,被誉为世界火山奇观。     

β-diversity Patterns of Plant Community in Fragmented Habitat in a Degenerated Meadow in Songnen Plain, China

A number of isolated islands of Leymus chinensis + herbosa community were investigated in fragmented habitat islands, by Braun-Blanquet field survey approach, in a degenerated meadow in the Songnen Plain, China in 2007. These islands were classified as large, medium, and small scales on the basis of the island area (100–1000m², large island; 50–100m², middle island; 10–50m², small island). Each scale of the investigation involved eight islands. The responses of β-diversity patterns of plant taxon to the habitat fragmentation at local community and metacommunity levels were analyzed on different scales of 24 isolated islands. The results indicated that at the local community level, there were 57 species belonging to 20 families and 49 genera in large islands, 49 species belonging to 16 families and 40 genera in middle islands, and 27 species belonging to eight families and 23 genera in small islands. β-diversity indexes for species, genus and family in large, middle, and small islands varied greatly, and the highest value of the indexes was not noted in the largest island. However, the average of the data obtained at the three scales showed that across large islands, Whittaker indexes were low and Bray-Curtis similarity indexes were high, while across small islands, Whittaker indexes were high and Bray-Curtis similarity indexes were low. At the metacommunity level, Whittaker indexes for species and genus showed a great significantly negative double logarithmic correlation (p<0.01) with the island area, whereas the Bray-Curtis indexes for species, genus and family showed a great significantly positive double logarithmic correlation (p<0.01) with the island area. At both local community and metacommunity levels, turnovers of species and genus could respond more sensitively to spatial changes of plant diversity patterns than that of family. Hence, the species and the genus could be used for the analysis of β-diversity patterns of plant community.