检索结果-南通市图书馆

Transformation of Carbon and Nitrogen by Earthworms in the Decomposition Processes of Broad-leaved Litters

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2007年第2期17卷 166-172页

作者： DONG Weihua yin xiuqin College of Urban and Environmental Science Northeast Normal University Changchun 130024 China

Earthworms are the important constituents in the decayed food web and the main ecological conditioners in the process of decomposition and nutrient mineralization. The transformation of organic carbon (C) and total nitrogen (N) in the broad-leaved litters ingested by earthworms was researched by means of a laboratory experiment. Experimental samples were collected from broad-leaved Korea Pine mixed forest in Liangshui National Natural Reserve (47°10′50″N, 128°53′20″E) in the northeastern Xiao Hinggan Mountains of Northeast China. The contents of organic C and total N in earthworms, leaf litters and earthworm faeces were analyzed. Results show that the organic C content was in the fol- lowing order: leaf litters>faeces>earthworms, while total N content was contrary to that of the organic C. The organic C contents in the different leaf litters were in the following order: Tilia amurensis>Betula costata>Acer mono, whereas the total N contents in the different leaf litters were: Betula costata>Tilia amurensis>Acer mono. The contents of organic C and total N in the faeces from the different leaf litters were almost consistent with the contents of the leaf litters. After the leaf litters were ingested by earthworms, the organic C, which was transformed to increase earthworms' weights, ac- counted for 3.90%-13.31% of the total ingestion by earthworms, while that in the earthworm faeces accounted for 6.14%-13.70%. The transformed organic C through the other metabolism (e.g., respiration) of earthworms accounted for 75.04%-89.92%. The ingested organic C by earthworms was mostly used for metabolic activities. The N ingested by earthworms was less than organic C. It is estimated that 37.08% of total N was transformed to increase the earthworm's weight, 19.97% into earthworm faeces and 47.86% for the consumption of the earthworm's activities. The earthworms not only increased the content of organic C and total N in the soil, but also decreased the values of C/N in the soil and

关键词： broad-leaved litters organic carbon total nitrogen earthworm C transformation N transformation

Composition and Spatial Distribution of Soil Mesofauna Along an Elevation Gradient on the North Slope of the Changbai Mountains, China

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2015年第6期25卷 811-824页

作者： JIANG Yunfeng yin xiuqin WANG Fubin College of Geography Sciences Northeast Normal University College of Tourism and Geography Sciences Jilin Normal University Jilin Key Laboratory of Animal Resource Conservation and Utilization

The Changbai Mountains, located in northeastern China, show clear vertical zonation of vegetation types. Six different habitats,namely Pinus koraiensis mixed broad-leaved forest, Pinus koraiensis-Picea forest, spruce-fir forest, Betula ermanii forest, alpine meadow and alpine semi-desert, at elevations ranging from 780 to 2 480 m, covering almost all ecosystems on the north slope of the Changbai Mountains, were investigated to determine: i) whether or not the community composition of soil mesofauna varied significantly at different elevations; ii) if different soil mesofauna groups would respond differently to elevation and iii) which factors influenced the spatial distribution of soil mesofauna along elevation. Soil mesofauna were collected from each habitat in spring(May),summer(July) and autumn(September) of 2009. The soil mesofauna communities were comprised of at least 44 groups and were dominated by Acari and Collembola, followed by Coleoptera, Diptera larvae and Enchytraeidae. The composition, diversity and abundance of soil mesofauna varied among the six habitats. Meanwhile, significant seasonal variations were observed in the composition,abundance and diversity of the soil mesofauna in each habitat. The taxonomic richness and Shannon index were affected by elevation and soil properties, while the abundance was only significantly affected by soil properties. With regard to taxa, the habitats and seasons had significant effects on almost all the abundances of the major taxonomic groups. The abundance of more taxonomic groups was significantly influenced by the soil properties, while those of Geophilomorpha, Araneae and other taxa were affected by *** is concluded that the composition and spatial distribution of the soil mesofauna varied along the elevation gradient on the north slope of the Changbai Mountains, which might be largely related to the variations of the plant community, soil properties and climate change resulting from the elevation gradi

关键词： abundance community composition diversity environmental factors taxonomic group

Responses of soil Collembolans to vegetation restoration in temperate coniferous and broad-leaved mixed forests

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2020年第6期31卷 2333-2345页

作者： Chen Ma xiuqin yin Huan Xu Yan Tao School of Geographical Sciences Northeast Normal University5268 Renmin StreetChangchun 130024Jilin ProvincePeople’s Republic of China Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization 5268 Renmin StreetChangchun 130024Jilin ProvincePeople’s Republic of China Key Laboratory of Vegetation Ecology Ministry of EducationNortheast Normal UniversityChangchun 130024Jilin ProvincePeople’s Republic of China

A total of 900 soil samples were collected from five habitats,including primary coniferous broad-leaved mixed forests,secondary coniferous broad-leaved mixed forests,secondary broad-leaved forests,secondary shrub forests,and cutover lands in spring,summer,and autumn to quantify responses of soil Collembolans(springtails)to the restoration of vegetation of temperate coniferous and broad-leaved mixed *** results reveal that the taxonomic composition of Collembolans varied in the different stages of vegetation *** variations were in regard to their abundance and *** similarities existed in Collembola communities at different stages of vegetation restoration,and distribution patterns of Collembola taxa displayed an evenness throughout all *** Collembolans tended to gather on litter layers and soil surface;the highest abundance was found in the upper 5 cm soil layer during the initial stages of vegetation ***,Proisotoma,and Folsomia genera responded positively to the restoration of ***,responses of Ceratophysella and Parisotoma genera were *** addition,the Onychiuridae family did not respond to the vegetation restoration *** was concluded that restoration of vegetative cover can increase the abundance of soil Collembolans,but different genera respond differently.

关键词： Soil Collembolans(springtails) Temperate coniferous and broad-leaved mixed forests Vegetation restoration

Dynamics and Relationships of Ca,Mg,Fe in Litter,Soil Fauna and Soil in Pinus koraiensis-Broadleaf Mixed Forest

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2008年第3期18卷 284-290页

作者： SONG Bo yin xiuqin ZHANG Yu DONG Weihua College of Urban and Environmental Sciences Northeast Normal University Changchun 130024 China

The Liangshui Natural Reserve in Heilongjiang Province of China was selected as the study area. The authors collected the samples of forest litter （Tilia amurensis, Fraxinus mandshurica, Pinus koraiensis, Acer mono, Betula costata, and mixed litter）, soil in humus horizon （0--5cm） and soil horizon （5-20cm）, and soil macrofauna （Oligochaeta, Geophiloporpha and Juliformia） from 2001 to 2002. The role of soil macrofauna in the material cycle was analyzed through comparing the macro-element contents among various parts of the subsystems and using enrichment index （El）. The results indicate that dynamic changes of various litters are very complicated. The contents of Fe in each kind of litter increase firstly, and then decrease in the study period. The changes of macro-element contents are greater in the broad-leaf litter than in the coniferous litter, and the mixed litter is in the middle level, but the differences among them are not significant. The contents of Mg and Fe in humus are higher than those in soil, but the contents of Ca in soil are higher than that in humus. The dynamic changes of macro-element contents in soil and soil fauna are not consistent with those in litter. The diplopod presented obvious enrichment of Ca and Mg （E1〉1）, but it does not significantly enrich Fe. Earthworm has a stronger enrichment ability of Fe than diplopod and scolopendra, but E1〈1. Soil fauna can make great influences on the material cycle of the subsystems.

关键词： soil fauna litter decomposition macro-element cycle Liangshui Natural Reserve

基于MAPK/ERK通路探讨益肾调经丸对大鼠多囊卵巢综合征的作用和机制研究

在线全文

学校读者我要写书评

暂无评论

陕西中医 2024年第1期45卷 23-28页

作者：刘雯星陈怡黄缨殷秀琴周芸湖北中医药大学湖北武汉430065 湖北中医药大学附属荆州中医院湖北荆州434000 荆州市中医药研究所湖北荆州434000 荆州市中医医院湖北荆州434000

目的:探讨益肾调经丸对大鼠多囊卵巢综合征模型的作用及其机制。方法:70只雌性SD大鼠随机分为正常组、模型组、空白对照组、达英35组和益肾调经丸低、中、高剂量组,每组10只。采用来曲唑+高脂饲料造模,造模成功后,各治疗组和空白对照组... 详细信息

目的:探讨益肾调经丸对大鼠多囊卵巢综合征模型的作用及其机制。方法:70只雌性SD大鼠随机分为正常组、模型组、空白对照组、达英35组和益肾调经丸低、中、高剂量组,每组10只。采用来曲唑+高脂饲料造模,造模成功后,各治疗组和空白对照组使用相应剂量的药物灌胃28 d。ELISA法检测血清睾酮(T)、促卵泡素(FSH)、促黄体生成素(LH)水平,计算LH/FSH;观察卵巢形态改变;HE染色法观察卵巢镜下观;Real-time PCR法检测卵巢组织中CYP17A1、CYP19A1 mRNA表达;Western blot检测p-ERK1/2的蛋白表达。结果:与正常组比较,模型组大鼠卵巢可见多囊样改变,血清T、LH水平升高,FSH降低,LH/FSH升高,卵巢呈多囊样改变,卵巢组织中CYP17A1 mRNA表达升高,CYP19A1 mRNA表达降低,p-ERK1/2蛋白表达升高(P0.05)。结论:益肾调经丸能够改善PCOS大鼠性激素水平,减轻卵巢多囊样改变。益肾调经丸可能是通过MAPK/ERK信号通路降低CYP17A1、上调CYP19A1表达,降低雄激素水平,从而改善PCOS大鼠卵巢多囊样改变及高雄激素状态。

关键词：多囊卵巢综合征 MAPK/ERK通路益肾调经丸补肾活血法高雄激素血症来曲唑大鼠

Spatio-temporal Variation of Landscape Heterogeneity under Influence of Human Activities in Xiamen City of China in Recent Decade

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2013年第2期23卷 227-236页

作者： HUANG Yixiong yin xiuqin YE Gongfu LIN Jiemin HUANG Ru WANG Na WANG Liang SUN Yue College of Urban and Environmental Sciences Northeast Normal University College of Geographical Sciences Fujian Normal University Fujian Academy of Forestry Sciences Quanzhou Land and Resources Bureau

Xiamen is an economically competitive and highly urbanized city along the coastal area of Fujian Province, China. The research on spatio-temporal variation of landscape heterogeneity under the influence of human activities is of great importance to the further study on the relationship of landscape pattern and ecological process. It is also crucial to the discovery of spatial variation and intensity distribution of human activities. The research analyzed the intensity of human impacts and the spatial variation features and dynamics of landscape patterns by introducing statistical theories and approaches. We analyzed spatio-temporal variation of landscape heterogeneity using the geostatistical techniques, such as semivariogram and Kriging *** show that there is a higher correlation between landscape heterogeneity indexes and human impact index. Both the indexes show a moderate spatial autocorrelation as well as an obvious characteristic of anisotropy. From 1998 to 2008, the spatial differentiation of the changes in the intensity of human activities and the changes in landscape heterogeneity shows that the landscape patterns in Xiamen are closely related with the urban land utilization methods, the condition of traffic and geographical location and the physical geographical condition such as the terrain and the ecological environment. The process of urbanization has a significant impact on the urban landscape pattern.

关键词： landscape heterogeneity human impact index human activities Xiamen City

A review on the eco-geography of soil fauna in China

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2010年第3期20卷 333-346页

作者： yin xiuqin SONG Bo DONG Weihua XIN Weidong WANG Yeqiao College of Urban and Environmental Sciences Northeast Normal University Changchun 130024 China College of Environment and Planning Henan University Kaifeng 475004 Henan China College of Urban and Environmental Sciences Changchun Normal University Changchun 130032 China Department of Natural Resources Science University of Rhode Island Kingston RI 02881 USA

This review summarizes main research findings in soil fauna eco-geography in China in the past 30 years. The subject areas and main results were overviewed including biodiversity and eco-geological distribution of soil fauna communities. Studies of ecological distributions of soil fauna and dynamic ranges in space from tropical, subtropical to temperate regions, and in categories from forest, grassland, desert, wetland, farmland to urban ecosystems, the responses and indications of soil fauna to soil environments. Effects of intensive disturbance such as fire, grazing, farming, fertilization on soil fauna include sensitive （e.g. nematode） and rare groups and community indexes. The functions of soil fauna were discussed including environmental construction, environmental purification, litter decomposition and elements cycling. Interactions between soil fauna and other biota in soil ecosystems and linking between aboveground and belowground diversity and the effects of global change on soil fauna community in China were also included. Finally, the authors pointed out common interests in soil fauna eco-geographical studies, which include application of molecule biology into soil fauna taxa; function and mechanism of soil fauna community diversity; interaction between aboveground and belowground ecosystems; effects of disturbance, pollution, biological invasion, and global change on soil fauna community and function. The review is to provide a scientific basis for promoting soil fauna eco-geographical studies in China.

关键词： soil fauna biodiversity bio-indicators functional role eco-geography

Intratree Variability of Cleavage Resistance of Chinese Fir from Plantation

在线全文

学校读者我要写书评

暂无评论

Chinese Forestry Science and Technology 2006年第4期5卷 27-32页

作者： XU Ming REN Haiqing LUO xiuqin yin Yafang Research Institute of Wood Industry Chinese Academy of Forestry Beijing 100091 P.R.China

This paper studied the variation of cleavage resistance of Chinese fir wood from plantation. Six trees of 36 years old were investigated, and the cleavage resistance properties for 672 samples made of the trees were tested. The samples were cut from the sapwood and heartwood at different directions (south and north) and heights (1.3, 3.3, 5.3 and 7.3 m) of the trees. The result showed that: tangential cleavage resistance was higher than radial one, and cleavage resistance of sapwood was higher than that of heartwood, but there was no significant difference in cleavage resistances between sections of the north and the south of the trees. There was a little variation in cleavage resistance between the radial and tangential from butt to top log, which shows a little decrease with the height from 1.3 to 5.3 m , but a rise in the top of the trees.

关键词： Chinese fir Cunninghamia lanceolata plantation natural forest cleavage resistance

在线全文

学校读者我要写书评

暂无评论

土壤动物在长白山臭冷杉凋落物分解中的作用

林业科学 2016年第7期52卷 59-67页

作者：王振海殷秀琴张成蒙东北师范大学地理科学学院长春130024 吉林省动物资源保护与利用重点实验室长春130024

【目的】研究长白山臭冷杉凋落物分解率和C、N、P元素释放量的变化规律,探讨土壤动物在凋落物分解过程中对臭冷杉凋落物分解和养分元素释放的影响,进一步完善土壤动物生态学研究,为长白山地区森林保护与管理提供科学依据。【方法】2011... 详细信息

【目的】研究长白山臭冷杉凋落物分解率和C、N、P元素释放量的变化规律,探讨土壤动物在凋落物分解过程中对臭冷杉凋落物分解和养分元素释放的影响,进一步完善土壤动物生态学研究,为长白山地区森林保护与管理提供科学依据。【方法】2011年10月—2012年10月,利用凋落物袋法对长白山北坡暗针叶林和明亮针叶林2个亚带(2类生境)优势种——臭冷杉凋落物的分解率、养分动态及土壤动物的作用进行研究。采用手捡和Tullgren法相结合来分离凋落物中的土壤动物,凋落物中有机碳(TOC)的测定先采用过量的K2Cr O7-H2SO4经高温消煮分解后,再用Fe SO4滴定法滴定,全氮(TN)和全磷(TP)相对含量的测定采用Smartchem140全自动化学分析仪完成。采用SPSS 18.0软件分析生境、网孔及其相互作用对凋落物分解率及养分含量的综合影响,并运用Pearson相关系数分析土壤动物个体数和类群数与凋落物分解率以及养分绝对含量间的关系。利用Canono for Windows4.5对各土壤动物类群与凋落物分解率和养分元素绝对含量进行冗余分析。【结果】2类生境中臭冷杉凋落物经过1年的分解,在1 mm网袋内的分解率显著高于0.01 mm网袋(P<0.05)。2种网袋内凋落物分解表现出季节性变化,夏秋季分解率高于冬春季。明亮针叶林2种网袋内凋落物的分解率高于暗针叶林。2类生境中2种网袋内的凋落物TN、TP相对含量经过1年的分解均有上升,且暗针叶林显著高于明亮针叶林,尤其是1 mm网袋内TP相对含量显著高于明亮针叶林(P<0.05);在明亮针叶林1 mm网袋内凋落物TOC相对含量低于暗针叶林,而0.01 mm网袋内相反。分解1年后2种生境1 mm网袋内凋落物TP相对含量显著低于0.01 mm网袋(P=0.001),而TN和TOC含量没有显著差异。暗针叶林凋落物分解过程中在网袋内共捕获21个类群905只土壤动物,明亮针叶林共捕获19个类群1 227只土壤动物。2类生境中参与臭冷杉凋落物分解的土壤动物主要有节跳虫科、甲螨亚目、山跳虫科、球角跳虫科、辐螨亚目、革螨亚目、线蚓科和鳞跳虫科。Pearson相关系数及RDA分析显示,土壤动物个体数、类群数和主要土壤动物类群与针叶林臭冷杉凋落物分解率呈正相关,而与TN、TP和TOC绝对含量呈负相关。【结论】土壤动物对臭冷杉凋落物的分解有显著的促进作用,因而对养分元素的释放有显著促进作用。

关键词：土壤动物臭冷杉凋落物分解养分释放针叶林长白山