检索结果-南通市图书馆

Cultivating Erect Milkvetch (Astragalus adsurgens Pall.) (Leguminosae) Improved soil properties inLoess Hilly and Gulliesin China

引用

Journal of Integrative Agriculture 2013年第9期12卷 1652-1658页

作者： WANG Zhan-bin WANG Qing-yi Animal Science and Technology School Henan University of Science and Technology

Erect milkvetch （Astragalus adsurgens Pall.）, a leguminous grass, is a major source of fuel and forage, and has an important role in the restoration of the degraded ecosystems in central and northeastern China. The objective of this work was to investigate how erect milkvetch planting would affect the physical and chemical properties of soil in degraded arable lands. soil samples at the depths of 0-20 and 20-40 cm were collected from erect milkvetch planting fileds at ages of 0, 1, 2 and 3 yr. Changes in soil bulk density, soil porosity, total N and P, organic matter content, available P, hydrolysable N and available K were measured. The results showed that root biomass and above-ground plant biomass were both significantly increased with plantation age. The significant increase in root nodule biomass was not observed in the first two years. However, it was significantly increased after three years. Root growth of erect milkvetch improved soil structure, and hence, decreased soil bulk density and increased soil porosity. Furthermore, the nitrogen fixation by erect milkvetch and return of erect milkvetch plant to soil increased the soil total N, hydrolysable N and organic matter content of the soil. Low concentrations of P in the soil with erect milkvetch planting could be ascribed to high plant uptakes and possibly to high sequestrations of P in plant biomass. Concentrations of K significantly increased during the first two years of erect milkvetch planting. The high accumulation of K under erect milkvetch cultivation in the first two years could partly be attributed to low plant uptake, and partly to relatively quick recycling within plant-soil systems. Three years after erect milkvetch plantingr, K accumulation at 0-20 cm soil layer was significantly lower than that from non-vegetated field sites, which could be attributed to high plant uptake. These parameters, except for soil bulk density, were all decreased with increasing soil depth. soil total N, organic matt

关键词： Asuagalus adsurgens Pall. soil properties plantation age loess hills and gullies

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Tree species composition and diversity in montane forests of Garhwal Himalaya in relation to environmental and soil properties

引用

Journal of Mountain Science 2020年第12期17卷 3097-3111页

作者： Dinesh Singh RAWAT P.TIWARI Sudipta Kumar DAS J.K.TIWARI Department of Botany&Microbiology HNB Garhwal UniversitySrinagar(Garhwal)-246174UttarakhandIndia Central National Herbarium Botanical Survey of IndiaHowrah-711103West BengalIndia

The montane forests of Garhwal Himalaya were investigated for tree species composition and diversity in relation to environmental and edaphic variables.A stratified random sampling approach was adopted to collect the field data from each forest.A total of 39 tree species belonging to 31 genera and 23 families were recorded from the sampling area(6 forest stands ×10 plots in each).Lauraceae with 5 species was the largest family while Quercus(4 species) emerged as the largest ***-area curve(asymptote) predicted more species than the observed number of *** analysis has shown that the two Abies pindrow dominant forest stands had the highest similarity in tree species *** tree stem density ranged from 540-1170 ha-1,basal area 23.01-55.94 m^2 ha-1,ShannonWiener diversity index 1.69-2.49,evenness index0.42-0.74,beta diversity 0.40-0.82 and similarity index 0.17-0.54 in the six studied ***-way indicator species analysis(TWINSPAN) identified four distinct tree communities in the study area with Daphniphyllum himalayense,Abies pindrow,Quercus oblongata,and Pinus roxburghii as indicator species of corresponding *** correspondence analysis(CCA) ascertained the TWINSPAN results and revealed the relation of tree species with environmental and edaphic *** phytosociological attributes of tree species varied from one forest stand to another;however,the tree species richness,density,and diversity peaked at intermediate elevation on the north *** reveal that tree composition and diversity in the montane forests of Garhwal Himalaya are influenced by both environmental(elevation and slope aspect)and soil variables(texture,water holding capacity,moisture content,available N,exchangeable P,and pH).This study will help in understanding the forest distribution across the western Himalaya,guiding the conservationists and policymakers in carrying out conservation-related management activities,designing the long-

关键词： Diversity Tree species Montane forests soil properties Western Himalaya

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Influence of tourist disturbance on soil properties, plant communities, and surface water quality in the Tianchi scenic area of Xinjiang, China

引用

Journal of Arid Land 2016年第2期8卷 304-313页

作者： WEN Bin ZHANG Xiaolei YANG Zhaoping XIONG Heigang QIU Yang Xinjiang Institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China College of Resource and Environment Sciences Xinjiang UniversityUrumqi 830046China University of Chinese Academy of Sciences Beijing 100049China Department of Economic Management Huanghuai UniversityZhumadian 463000China Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000China

The impact of tourist disturbance on the environment has become a focal issue of environmental science, ecology, and travel management studies. To assess the influence of tourist disturbance on soils and plants in the Tianchi scenic area of Xinjiang, China, we compared soil properties and plant community characteristics at 0, 5, 10, and 20 m from the tourist trail within areas at three different altitudes, where the intensities of tourist disturbance are distinct. Surface water quality was also studied at three different levels relative to the Tianchi Lake. The results showed that tourist disturbance significantly increased soil pH within 10 m from the trail and soil bulk density on the edge of the trail, but significantly reduced soil organic matter and total nitrogen contents within 5 m from the trail. The number of tree seedlings on the edge of the trail and the shrub coverage and height of herbaceous plants within 5 m from the trail significantly decreased due to tourist disturbance. Changes in herbaceous plant diversity differed by soil zones. In the high altitude region, tourist disturbance led to a remarkable increase in the herbaceous plant diversity on the edge of the trail, while in the low altitude region, tourist disturbance had a low impact on the diversity of herbaceous plants. In addition, tourist activities polluted the surface water, significantly reducing water quality. Thus, current tourist activities have a significant negative impact on the ecological environment in the Tianchi scenic area.

关键词： tourist disturbance soil properties plant communities water quality Tianchi scenic area

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Double mulching improves soil properties and productivity of maize-based cropping system in eastern Indian Himalayas

引用

International soil and Water Conservation Research 2020年第3期8卷 308-320页

作者： Bidyapati Ngangom Anup Das Rattan Lal Ramkrushna Gandhiji Idapuganti Jayanta Layek Savita Basavaraj Subhash Babu Gulab Singh Yadav Probir Kumar Ghosh ICAR Research Complex for NEH Region UmiamMeghalayaIndia Krishi Vigyan Kendra-ICAR Research Complex for NEH Region Arunachal Pradesh CentreBasarArunachal PradeshIndia College of Post Graduate Studies Central Agricultural UniversityUmiamMeghalayaIndia ICAR Research Complex for NEH Region Tripura CentreLembucherraTripuraIndia Carbon Management and Sequestration Centre Ohio State UniversityUSA ICAR-Central Institute for Cotton Research NagpurMaharashtraIndia ICAR-KrishiVigyan Kendra IndiUniversity of Agricultural SciencesDharwadIndia ICAR-Indian Agricultural Research Institute New DelhiIndia ICAR-National Institute of Biotic Stress Management RaipurChhattisgarhIndia

A field experiment was conducted for two consecutive years at North Eastern Indian Himalayan region to assess the effect of soil moisture conservation measures on soil and water productivity of different rainfed maize(Zea mays L.)-based cropping *** revealed that double mulching with in-situ maize stover mulch(MSM)+fresh biomass of white hoary pea(WHP-Tephrosia candida)and MSM+fresh biomass of ragweed(RW-Ambrosia artemisiifolia)improved soil moisture content(SMC)and leaf relative water content of crops during dry *** soil organic carbon(SOC)content and stocks under MSM+WHP and MSM+RW mulches were significantly higher than that under no mulch at 0-15 cm *** soil microbial biomass carbon and dehydrogenase activity were maximum under MSM+WHP/*** highest system productivity was obtained from maize-French bean(Pole type-PT)sequence under MSM+RW followed by MSM+*** water productivity was the highest under MSM+*** SOC content was the highest under maize-French bean(PT),the maximum plant available nitrogen and phosphorus were obtained under maize-black gram ***,double mulching technology involving MSM and RW(available in plenty)is a viable option for improving soil,crop and water productivity under rainfed hill ecosystems of eastern Indian Himalayas.

关键词： Cropping systems Rainfed agriculture Residual soil moisture soil properties Water productivity

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of Reclamation Time and Land Use on soil properties in Changjiang River Estuary,China

引用

Chinese Geographical Science 2011年第4期21卷 403-416页

作者： SUN Yongguang LI Xiuzhen ülo MANDER HE Yanlong JIA Yue MA Zhigang GUO Wenyong XIN Zaijun State Key Laboratory of Estuarine and Coastal Research East China Normal UniversityShanghai 200062China National Marine Environment Monitor Center Dalian 116023China Department of Geography Institute of Ecology & Earth SciencesUniversity of Tartu46 Vanemuise St.Tartu51014Estonia

The objective of this study is to analyze soil physical and chemical properties,soil comprehensive functions and impact factors after different years of *** on the survey data taken from 216 soil sampling points in the Fengxian Reclamation Area of the Changjiang (Yangtze) River Estuary,China in April 2009 and remotely sensed TM data in 2006,while by virtue of multivariate analysis of variance (MANOVA),geo-statistical analysis (GA),prin-cipal component analysis (PCA) and canonical correspondence analysis (CCA),it was concluded that:1) With the in-crease in reclamation time,soil moisture,soil salinity,soil electric conductivity and soil particle size tended to decline,yet soil organic matter tended to *** available phosphorous tended to increase in the early reclamation period,yet it tended to decline after about 49 years of *** nitrate nitrogen,soil ammonia nitrogen and pH changed slightly in different reclamation *** physical and chemical properties reached a steady state after about 30 years of reclamation.2) According to the results of PCA analysis,the weighted value (0.97 in total) that represents soil nutrient factors (soil nitrate nitrogen,soil organic matter,soil available phosphorous,soil ammonia nitrogen,pH and soil particle size) were higher than the weighted value (0.48 in total) of soil limiting factors (soil salinity,soil elec-tric conductivity and soil moisture).The higher the F value is,the better the soil quality is.3) Different land use types play different roles in the soil function maturity process,with farmlands providing the best contribution.4) soil physi-cal and chemical properties in the reclamation area were mainly influenced by reclamation time,and then by land use *** correlation (0.1905) of the composite index of soil function (F) with reclamation time was greater than that with land use types (-0.1161).

关键词： soil properties land use types reclamation time soil function Changjiang River Estuary

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Correlation of soil properties and fruit size of Callgonum mongolicum and related species

引用

Journal of Arid Land 2012年第1期4卷 63-70页

作者： Wei SHI BoRong PAN Habibullo SHOMURODOV Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Turpan Eremophytes Botanic Garden Chinese Academy of Sciences Turpan 838008 China Scientific Center of Plant Production ＂Botanika＂ Uzbek Academy of Sciences Tashkent 32 Uzbekistan

Correlations of soil properties and fruit size of Calligonum mongolicum Turcz. and related species were analyzed. The resullLs showed that the particle size characteristics of soils for growing Calligonum mongolicum and related species were similar, and the soils belonged to sandyones. The organic matter contents of soils were low （averaging 1.772 to 3.054 g/kg）, and the total salt content of soils was low too （averaging 0.471 g/kg）. The pH values indicated that the soils were alkaline, varying from pH 7.65 to 10.25. The results of Principal Component Analysis （PCA） and hierarchical cluster showed that 9 habitats could be divided into 6 types according to salt contents and pH values. Fruit sizes of different populations and the soil properties had significant linear correlations （P〈0.000）. It was concluded that the differences in fruit sizes among the populations of Calligonum mongolicum and related species werre related to soil variability, especially the nutrient contents of soils, and fruit size can not be considered as a taxonomic index of Calligonum mongofcum and related species.

关键词： Calligonum mongolicum related species soil properties fruit size correlation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Changes in vegetation and soil properties following 6 years of enclosure in riparian corridors

引用

Journal of Plant Ecology 2020年第2期13卷 131-138页

作者： Di Wang Yi-Ran Zhang Yu-Long Feng Zhi Liu Bo Qu College of Plant protection Shenyang Agricultural UniversityShenyang 110016Liaoning ProvinceChina Liaoning Key Laboratory for Biological Invasions and Global Changes Shenyang Agricultural UniversityShenyang 110016Liaoning ProvinceChina Liaoning Provincial Key Laboratory for Urban Ecology Shenyang Academy of Environmental SciencesShenyang 110016Liaoning ProvinceChina State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Bioscience and Biotechnology Shenyang Agricultural UniversityShenyang 110016Liaoning ProvinceChina

Aims Riparian corridors play vital roles in the maintenance of ***,plant species diversity and vegetation coverage in riparian corridors are seriously threatened by increasing pressure owing to livestock consumption and anthropogenic disturbance;even the stability of river courses has been *** establishment of enclosures is a widely used strategy to restore degraded grassland ecosystems,but its impact on degraded herbaceous riparian vegetation and soil properties remains *** aim of this study was to evaluate whether species composition,richness,diversity,and soil properties can be recovered by the *** Twenty long-term monitoring sample plots were set in the Liaohe main stream river,Liaohe main stream river was enclosed for grazing and farmland exclusion in *** height,coverage and individual numbers of plant were recorded for species richness and diversity evaluation from 2012 to 2017;soil nutrients were measured for comparative analysis in 2012 and *** examined the effects of the establishment of enclosures on plant species diversity and soil properties from 2012 to 2017 in the riparian corridors of the Liaohe River system in *** Findings Plant species richness and diversity significantly increased from 2012 to *** dominance of Asteraceae plants increased,while the abundance of Gramineae plants decreased over *** difference in abundance increased each year since enclosure was implemented in *** concentrations of phosphorus and potassium in the soil significantly decreased as a result of the combined effects of vegetation restoration and prohibition of farming practices following the establishment of *** was also a lag time related to the response of soil organic matter to the establishment of *** conclusion,our study provides new evidence regarding the response of species diversity,species composition and soil properties following riparian vegetation rest

关键词： herbaceous vegetation dominant species composition species diversity Liaohe river riparian corridors soil properties ecological restoration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

soil and water conservation effects on soil properties in the Middle Silluh Valley,northern Ethiopia

引用

International soil and Water Conservation Research 2017年第3期5卷 231-240页

作者： Solomon Hishe James Lyimo Woldeamlak Bewket Department of Geography and Environmental Studies Mekelle UniversityMekelleEthiopia Institute of Resources Assessment University of Dar es SalaamTanzania Department of Geography and Environmental Studies Addis Ababa UniversityAddis AbabaEthiopia

Community-based soil and Water Conservation(SWC)practices have been adopted in the Tigray region since 1991 for restoration of the degraded *** effects of those conservation measures on physico-chemical properties of soil were limitedly ***,this study evaluated the effects of SWC on selected soil properties in the Middle Silluh Valley,Tigray region,Northern *** study considered conserved landscapes(terraced hillside,terraced farmland and exclosure area)and non-conserved landscapes(non-terraced hillside,non-terraced farmland and open grazing land)for comparison using a one-way analysis of variance(ANOVA).A total of 24 samples were collected from each landscape at a depth of 10–30 *** results indicated that mean bulk density(BD)was low on terraced hillside,non-terraced hillside and exclosure *** and clay content were significantly different at Psoil Organic Matter(SOM)and clay content,SOM and Total Nitrogen(TN)showed strong positive ***,the results show that SWC had significantly positive effects on soil's physical and chemical properties in the study area.

关键词： Land degradation soil and water conservation soil properties Middle Silluh Valley Ethiopia

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Effect of Land Use on soil properties in Debris Flow Bottomland:A Case Study at Xiaojiang Basin, Yunnan

引用

Wuhan University Journal of Natural Sciences 2006年第4期11卷 870-874页

作者： ZHANG Qiuying LI Fadong LIU Mengy SONG Xianfang OU Guoqiang Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041 Sichuan China Graduate University of Chinese Academy of Sciences Beijing 100049China Institute of Genetic and Developmental Biology Chinese Academy of Sciences Shijiazhuang 050021 Hebei China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China

In order to understand the effect of different land use on soil physics and nutrients properties of the debris flow bottomland, a case study at Daqing gully （in Xiaojiang Basin, Yunnan） was conducted in 2004. soil samples were taken at depth of 0-10,10-20,20-40,40-60,60-80 cm under three land use patterns crop bottomland （CL）, forest bottomland （FL）, and barren bottomland（BL）. The results showed that the developing bottomland to CL promoted soil toaccumulate total phosphorus （TP） and available phosphorus （AP）, pH value transferred from neutral to alkalescency, and organic matter decreased significantly. Furthermore, the contents of total nitrogen （TN） and available nitrogen （AN） in CL were lower than that of FL and BL because the growth of crops consumed more nutrients in soil. The results also showed that the contents of TP, AP and available potassium （AK） in soil were positively correlated with soil particle.

关键词： land use soil properties soil granule composition Xiaojiang Basin

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Mixed Forests of Chinese Fir and Tsoong's Tree on soil properties

引用

Pedosphere 1998年第2期8卷 161-168页

作者： ZHENGYUSHAN DINGYINGXIANG DepartmentofForestResourcesandEnvieronment FujianForestryCollegeNanjping351001（China） CollegeofFores

An investigation and on 13 year old (1984～1996) Chinese fir and Tsoong's tree mixed forests in Jianou City, Fujian Province, China was carried out to compare the influences of different interplanting types of individual tree tree, row row, row strip (three rows) and pure Chinese fir stands on soil properties. Compared with the pure stands of Chinese fir, the mixed stands exerted a positive effect on soil fertility, with increases in soil organic matter, total N, available P and available K. Moreover, improvements were also observed in soil enzymatic activities, aggregate structure, structure stability, status of soil porosity, soil aeration and penetrability in mixed stands. The row row interplanted stands had the best effect on tree growth and soil properties among these mixed forests. In the southern subtropical region, the spreading of the row row mixing model of the two tree species would be helpful to preventing the soil from fertility deterioration caused by successive plantation of Chinese fir.

关键词： Chinese fir mixed forest soil properties Tsoong's tree

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：