Investigation on population dynamics of Fejervarya multistriata in plantations of Fujian Province, eastern China.

2011年6—9月和2012年4—5月,采用“围栏陷阱法“对福建省将乐县国有林场典型人工林内泽陆蛙种群进行调查,共捕获泽陆蛙222只。采用聚类分析方法,按照体长、体重将泽陆蛙划分为成体和亚成体,分析不同月份、不同类型人工林、不同林龄人工林内泽陆蛙的日均捕获量、肥满度和重长比的变化规律。结果显示:1)人工林泽陆蛙日均捕获量随月份变化先减小后增大,肥满度无显著变化,重长比先增大后减小。2)人工林泽陆蛙肥满度、重长比,混交林高于纯林;日均捕获量纯林高于混交林。3)随人工林林龄的增加泽陆蛙肥满度、重长比增大,中龄林泽陆蛙日均捕获量最高。研究结果可为人工林物种多样性保护提供新思路,并为人工林经营模式的转变提供参考。From June to September 2011 and April to May 2012, we had made a preliminary investigation on the rice frog communities in different typical plantations using the "Fence with pitfall trap" in Jiangle County of Fujian Province, eastern China and 222 rice frogs were captured.Based on snout-vent length and body weight, rice frogs were divided into adult and subadult by using cluster analysis.The variation of daily-catches, relative-fatness and weight/length index were analysed in different months, different types of plantations and varied age of plantations.The result showed that: 1) the daily-catches and weight/length index of rice frog in plantations decreased first and then increased from April to September, and the relative-fatness had no significant changes; 2) The relative-fatness and weight/length index of rice frog in pure plantations were higher than mixed plantations, and the daily-catches was contrary;3) The relative-fatness and weight/length index of rice frog were growing with the age of plantations, and the daily-catches reached the highest in middle age plantations.The results can provide new ideas for protecting the species diversity in plantations and guide for changing the management mode of plantations.林业公益性行业科研专项(200904003

东方白鹳的繁殖生态与幼雏的驯养

东方白鹳（Ciconia ciconia boyciana）属鹳形目鹳科,涉禽,晚成鸟。是国家一类保护对象,春季在我国东北和苏联境内繁殖,冬季在我国长江中下游越冬。近年来在北戴河对其迁徙数量调查中发现,总数仅三千多只,实为珍稀鸟类。为了解其繁殖生态与幼雏的生长发育规律,我们于1987、1988年春对兴凯湖自然保护区内的东方白鹳作了观察研究,现整理如下: 一、自然概况兴凯湖自然保护区位于兴凯湖东北,从太阳岗至龙王庙区间的湖岗以及东侧大片芦苇沼泽地,平均海拔67米。属寒温带,年平均气温为3℃,年降雨量为503mm。冬季多为西北风,夏季则多为西南风。保护区内有松阿察河、瞿麻子河、地河等,大小湖泡达14个,主要有莲花池、南大泡、东大泡

用微结构改进InGaAlP量子阱发光二极管的出光强度

针对半导体发光二极管（LED）出光效率低下的问题，提出了一个LED顶部引入周期性微结构的新设想。根据这一设想，采用简单的微加工技术研制成功带有环形槽微结构的圆台形InGaAlP量子阱LED。结明表明，这种新型LED在竖直方向的出射光强比不带微结构的LED有明显增强。这一成功为改进发光二极管的出光效率提供了新的途径

Sediment records of DDTs in intertidal sediment core of Daliao River Estuary and their responses to anthropogenic activities in the past century

Dichlorodiphenyltrichloroethanes (DDTs) are still detected in various environmental matrices,although their usage in agriculture has been banned for about 30 years in China.Intertidal zone,as the intersection area of land and sea,is the final sink for contaminants.To comprehensively understand the deposition features of DDTs in intertidal sediment of Daliao River Estuary,a sediment core was sampled in this study.Combined with the dating data,the distribution,potential risk,source and fate of DDTs were investigated.The results showed that DDTs concentrations ranged from 0.313 ng&middot;g~(-1) to 4.116 ng&middot;g~(-1) (median:2.061 ng&middot;g~(-1)),with p,p&#39;-DDTs being the major components.Interestingly,the peak of DDTs concentrations (3.4364.116 ng&middot;g~(-1)) during 1988 1996 corresponded well with the peak of pesticide production during 19711981,and a 15-year-round time lag was observed between these two peaks.Possible usage of technical DDT was implied after year 2000 for the control and prevention of disease in Liaoning Province.The risk assessment of DDTs revealed that concentrations of DDT and DDE in sediment core rarely (&lt;25%) showed negative effect,while concentrations of DDD and total DDTs in the depth of 044 cm occasionally (25%50%) showed negative effect.The specific ratios of DDTs demonstrated that DDTs in the intertidal sediments were mainly from historical use of technical DDT rather than the use of dicofol.DDE and DDD were the main degradation products of DDT in the deeper layer (62110 cm) and shallower layer (061 cm),respectively.Further analysis revealed that the increased TOC content caused by human activities after year 1971 was the main reason that led the sediment environment changing from aerobic environment to anaerobic environment.What&#39;s more,DDTs concentrations in sediment core had strong positive correlations with sediment properties (TN,TP and TOC) (P &lt;0.01),and also had a significant positive correlation with anthropogenic activities (such as GDP,urbanization and total agricultural output value) (P &lt;0.01).Therefore,the results of the concentrations and compositions of DDTs in intertidal sediment core could reflect the direct and indirect influence of human activities on the occurrence and fate of contaminants in intertidal sediment.</p

基于二维表面等离子体激元的微结构

在介电常数符号相反的两个材料的界面处可激发出表面等离子体激元（Surface plasmon)。文中利用普通扫描电子显微镜中出现的电子束诱导沉积纳米碳基本现象，提出和发展了一种无需光刻胶和额外掩模的亚微米图形化技术。采用这一新方法，成功地在镀金的半导体InGaAlP量子阱表面制备了各种亚微米点阵结构，并得到基于二维表面等离子体激元的可见波段半导体发光的增强作用