在北纬41°10′的东北鞍山地区发现白蜡虫ERICERUS PELA CHAVANNES自然种群

关于白蜡虫在我国的地理分布,王辅(1963,1978)认为:“白蜡虫以北纬26°-32°40′之间为其适生地带,26°以南或33°以北均不适其生存。”近年来,我们通过考察认为:在北纬26°以南和33°以北地区,均有白蜡虫自然种群存在。 一、鞍山地区自然概况 鞍山位于东径123°,北纬41°10′,辽河平原东南边缘,东邻千山山脉,南与辽宁半岛相连;海拔20—708米;本地属大陆性半湿润型温带气候,年均气温8.8℃,最冷月均温-10.2℃,极端最低气温-30.4℃,极端最高气温36.9℃,≥10℃年积温3536.3℃,相对湿度63％,年降水量713.5毫米;本市海拔21.6米;植被为暖温带落叶阔叶林。     

天台山森林植被及其利用和保护

一、概况天台山地处东经120°50′—121°24′与北纬29°09′—29°28′之间,在政区上位于浙江省东部,跨天台、新昌、宁海三个县,是仙霞岭的支脉。境内多低丘谷地和山间台地,主峰苍上顶座落在整个山区的南端,海拔1113.4m。在气候分区上,本区属于亚热带中部,为季风气候区。年平均气温16.27℃,最冷月均温5.1℃,最热月均温23.5℃,年降水1320.5mm。山区南部的华顶山常年多雨雾,空气湿度大,年降水达1700mm以上,日均温≥10℃,积温为2858—5157℃,全年生长期长达200—240天。     

亚洲季风区铁杉属现代分布区及其气候特征

铁杉属在亚洲主要分布于亚洲季风区东部,间断分布于中国大陆、台湾岛以及日本列岛（除北海道）。在中国大陆间断分布在西南山区（横断山区和部分东喜马拉雅）、中部山区（秦岭-大巴山区）和东南山区（华东山地）。亚洲季风区铁杉属的现代分布环境要求年降水量范围为720～2103mm,生长季降水量为635～1489mm;年均温范围为5．8～18．2℃,冬季月均温为-2．7～11．5℃,年最冷月均温为-3．7-10．9℃,年最暖月均温为13．0—28．2℃,气温年较差为9．7～25．4℃。亚洲季风区铁杉属的现代地理分布与气候要素值相互关系的分析表明,无铁杉分布的朝鲜半岛及其邻近的我国东北山地和山东山地降水量均大于700mm,基本上能够满足铁杉属生长的水分条件;而朝鲜半岛及其邻近的我国东北山地和山东山地的气温年较差明显大于铁杉属分布区的值,同时两地的冬季月均温和年最冷月均温明显低于铁杉属分布区的值,这也是这些地区没有铁杉属分布的主要气候原因。总之,这些亚洲季风区水分条件能够满足铁杉属生长需要,但冬季温度（包括冬季月平均温度和年最冷月均温）和气温年较差无法满足铁杉属生长需要,导致这些地区无铁杉属现代分布记录。     

花桥村的生态农业

基本概况花桥村地处东经104°50′,北纬27°10′,座落在云南、贵州两省交界的烟堆山下,全村总面积2km~2,耕地61.3ha,占全村总面积30%,海拔1,810—1,860m,向四周伸延10—20km,北界便是云南省管辖的烟堆山,海拔1,940m,南靠贵州省管辖的麻窝山,海拔2,400m,东与邻村新华梁子接壤,海拔2,100m,西连邻村龙翻身大坡,海拔2,000m。横贯全村的后河,汇流金沙江(长江上游)南岸支流牛栏江。花桥村是一个四面环山的低纬高原盆地,全村冬无严寒,夏无酷暑,年均温≥12℃,元月均温≥4.2℃,七月均温≥19.23℃,全年总积温4,100℃。     

中国嵩草属植物地理分布模式和适应的气候特征

为了明确嵩草属(Kobresia)植物分布与气候要素的关系, 收集了嵩草属植物地理分布资料和气象台站气候数据, 应用ArcGIS软件及SPSS软件中的聚类分析方法, 分析了嵩草属植物地理分布模式和适应的气候特征。结果显示: 嵩草属植物分布在青藏高原、西北、华北和东北部分地区, 广泛分布13种, 间断分布10种, 分布海拔为1 400-5 000 m, 经度和纬度范围分别为81-112° E和23-46° N。嵩草属植物适应的气候要素平均值范围: 年生物学温度为4-19 ℃, 年平均气温为0-20 ℃, 年平均最高气温为7-28 ℃, 年平均最低气温为-6-16 ℃, 极端最高气温为25-40 ℃, 极端最低气温为-37.0-0.0 ℃, 1月和7月平均气温分别为-14-13 ℃和11-24 ℃, 1月和7月最高气温分别为-7-23 ℃和18-30 ℃, 1月和7月最低气温分别为-22-7 ℃和5-20 ℃, 春夏秋冬季气温分别为-4-19 ℃、9-23 ℃、6-21 ℃和-11-15 ℃, 温暖指数为23-159 ℃, 寒冷指数为-36-0 ℃, 年降水量为154-1 500 mm, 春夏秋冬降水量分别为19-135 mm、53-662 mm、48-545 mm和5-92 mm, Holdridge潜在蒸散量为261-1 100 mm, Thornthwaite潜在蒸发量为399-895 mm, 干燥度为167-786, 湿润指数为179-816, 4-10月日照时数为990-2 100 h。在热量要素平均值较低和中等、降水量与干燥湿润度平均值中等或辐射时数平均值较高范围下分布种数较多。嵩草属植物适应的气候要素极值, 年平均气温最小最大值范围为-6-21 ℃, 年平均最低气温最小值最高气温最大值范围为-12-28 ℃, 极端最低气温最小值最高气温最大值范围为-48-42 ℃, 最冷最热月气温范围为-32-33 ℃, 冬夏季最低最高气温范围为-20-25 ℃, 降水量最小最大值范围为15-1 800 mm, 干燥度最小最大值范围为7-890, 日照时数最小最大值范围为701-2 300 h。在热量要素极值较低、降水量及干燥度极值中等或日照时数极值较大范围下分布种数较多。说明嵩草属植物主要适应于低温亚湿润型和中温湿润型气候。     

中国西北部干旱区的植被地理分布及大农业的发展方针(续)

二、荒漠、裸露荒漠带本带是我国极端干旱地区,年降水量一般低于50—100毫米,包括塔里木盆地、东疆和柴达木盆地。塔里木盆地和东疆海拔1000—1500米,属暖温带气候。≥10℃年积温为3800—4700℃,年均温约为10—20℃;一月均温为-6到-10℃,绝对最低为-16.9℃;7月均温为25—26℃,绝对最高为43.6℃;无霜期186—230天。全境有不少面积为无植被的流动沙丘和裸露砾漠。在塔里木盆地超旱生的灌木荒漠最为突出,在山前洪积扇上有极稀疏的膜果麻黄、木坝王、泡泡刺、沙拐枣砾漠,盆地中间有极稀疏的柽柳沙漠。低     

封面说明

正封面照片由江西师范大学地理与环境学院张宇婧于2017年8月拍摄."中国最冷小镇"呼中位于黑龙江省西北部大兴安岭地区(51°14'40″—52°25'00″N,122°39'30″—124°21'00″E),被称为"森林腹地,兴安之巅",海拔500～1000 m,四面环山,年平均气温-4.3℃,年均降水量497.7 mm,四季分明,属大陆性季风气候,素有中国偃松之乡、红毛柳之乡、黑木耳之乡的美誉.黑龙江呼中     

安徽省绩溪县清凉峰自然保护区主要森林植被类型及其分布

一、森林植被的生态环境清凉峰是天目山脉的一部分,地处两省三县(安徽省绩溪县和歙县,浙江省临安县)交界处。最高峰位于北纬30°07′,东经118°55′,海拔1787.2m。清凉峰北坡位于绩溪县境内,目前保存较好的森林植被约2 733.3ha。属亚热带季风气候类型。四季分明,春季多阴雨,初夏雨量集中,气候温暖湿润,冬无严寒,夏无酷暑。据清凉峰南坡气象站1980年记载,在海拔1 480m处,年平均气温9.7℃,最热月平均气温20.1℃,最冷月平均气温-2.1℃,极端最高气温27.6℃,极端最低气温-17.6℃,年降雨     

广西龙胜县里骆林区土壤微生物区系生态分布及生化活性的研究

里骆林区位于龙胜县中部,地理位置在北纬25°50′—25°58′,东经110°02′—110°07′,属高炮山岭的南坡,地势自东北向西南倾斜,从海拔1703m 下降到210m 左右,面积100km~2,是龙胜县水源林基地,也是龙胜县人工林生产基地。里骆林区地处亚热带,气候温凉湿润,雨量充沛,在海拔370m 的伍家,年平均气温17.6℃,最冷月平均气温7.1℃,最热月平均气温26.0℃,年降雨量1580.0mm,年平均相对湿度81%。而海拔1020m 的西江坪,年平均     

江苏森林植被及其改造利用

一、自然环境概况江苏位于东经116°22′—121°55′,北纬34°46′—35°07′之间,东濒黄海,地跨暖温带、北亚热带和中亚热带三个生物气候带。灌溉总渠以北为落叶阔叶林地带,年均温13.8℃,一月均温-0.7℃,极端最低均温-13.4℃,年降水量912毫米。境内东北部有胶东、鲁南山地延伸入境的丘陵低山,一般海拔100—200米,连云港的云台山达625米,为全省最高岭。地带性土类为棕壤。植被受海洋性气候影响,并有复杂山岳地貌的有利生     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

A Unique Protease Cleavage Site Predicted in the Spike Protein of the Novel Pneumonia Coronavirus (2019-nCoV) Potentially Related to Viral Transmissibility

正Dear Editor,In December 2019, a novel human coronavirus caused an epidemic of severe pneumonia(Coronavirus Disease 2019,COVID-19) in Wuhan, Hubei, China(Wu et al. 2020; Zhu et al. 2020). So far, this virus has spread to all areas of China and even to other countries. The epidemic has caused 67,102 confirmed infections with 1526 fatal cases     

Curcuminoids as inhibitors of thioredoxin reductase: A receptor based pharmacophore study with distance mapping of the active site

Curcumin is the yellow pigment of turmeric that interacts irreversibly forming an adduct with thioredoxin reductase (TrxR), an enzyme responsible for redox control of cell and defence against oxidative stress. Docking at both the active sites of TrxR was performed to compare the potency of three naturally occurring curcuminoids, namely curcumin, demethoxy curcumin and bis-demethoxy curcumin. Results show that active sites of TrxR occur at the junction of E and F chains. Volume and area of both cavities is predicted. It has been concluded by distance mapping of the most active conformations that Se atom of catalytic residue SeCYS498, is at a distance of 3.56 from C13 of demethoxy curcumin at the E chain active site, whereas C13 carbon atom forms adduct with Se atom of SeCys 498. We report that at least one methoxy group in curcuminoids is necessary for interation with catalytic residues of thioredoxin. Pharmacophore of both active sites of the TrxR receptor for curcumin and demethoxy curcumin molecules has been drawn and proposed for design and synthesis of most probable potent antiproliferative synthetic drugs.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.