Diatom Response to Global Warming in Douhu Lake,Southeast China

A large number of lacustrine sedimentary records indicate that global warming is the main factor leading to significant changes in diatom communities in lakes of the northern hemisphere.However,due to the intensification of human activities since 1850,some scholars have emphasized that the increasing lake trophic level may be the main reason for the changes in diatom communities.The debate is ongoing.In order to avoid falling into the complex relationship between diatom changes and the seasonal cycle that characterizes lakes in mid and high latitudes,we chose a lake located at a low latitude,where the relationship between diatoms and temperature is not indirect but direct.The diatom record spans the past ca.100 years and reveals that the abundance of Aulacoseira granulata increased from 1900 until 1985,replacing the previously dominant Aulacoseira ambigua.These changes are in agreement with the increasing trend in global temperature.Since 1985,the percentages of the small-celled Discostella stelligera and the benthic diatom Navicula heimansioides have increased,while Aulacoseira granulata has decreased.This latest shift is caused by further global warming.We conclude that warming is the main factor leading to changing diatom communities in Douhu Lake.

盱眙县陡湖湿地自然保护区调整研究

为了实现自然保护和地方经济发展双赢,根据自然保护区调整准则,于2014年对盱眙县陡湖湿地自然保护区范围及分区进行了调整:保护区总面积调整为33.41 km2,比始建的少7.59 km2;划定保护区的核心区、缓冲区、实验区面积分别为3.52、12.47、11.89 km2,占保护区总面积分别为12.63%、44.73%、42.64%。调整后湿地保护区的功能得到加强,并有效减弱了人为活动的干扰,更有利于优化保护区的管理和促进当地社会经济的协调发展。

广东省新兴县都斛铜矿床地质特征与找矿潜力

广东省新兴县都斛铜矿床处于吴川—四会深大断裂的中部边缘带,其铜成矿活动主要受本区燕山期斑岩体和NE向断裂构造双重控制,已发现的脉状铜矿体产状各异,在空间上整体形成一个不规则的环状,单个矿体呈细脉分布在黑云母二长花岗岩中,并具有浸染状矿化分布在花岗闪长斑岩等斑岩型矿床的矿化特征。通过对该矿床成矿地质特征的综合研究,对比粤西地区及国内类似斑岩型矿床的找矿经验,认为都斛铜矿床具有斑岩型矿床地质特征,处于斑岩矿床外围或顶部的脉状矿体带,具有寻找斑岩铜矿的潜力。

陡湖生态适宜性和土地价值评价及其应用

随着航空航天技术的发展与普及,遥感技术被广泛应用于城市信息分析和研究,尤其在生态敏感地带的城市空间开发方面具有独特优势。本文利用Landsat8及DEM影像数据,对江苏省淮安市盱眙县陡湖区域的地形、土壤、植被、水文、水质、生态环境质量等进行了分析评价,并结合城市资源综合评估区域的土地价值,为地块规划布局提供了科学的依据,在最大限度地满足城市发展需求的情况下,确保开发能够在可控的生态保护目标下进行。