检索结果-南通市图书馆

Elevational distribution of forests and its spatiotemporal dynamics in subtropical china from 2000 to 2019

Science china Earth Sciences 2024年第8期67卷 2563-2582页

作者： Zhencan ZHENG Liuwen ZHUANG Guofang MIAO Han LIU Zhiqiang CHENG Wenyu LI Rong SHANG Peng GONG Jing Ming CHEN Institute of Geography Fujian Normal University Key Laboratory of Humid subtropical Eco-Geographical Process (Ministry of Education) Fujian Normal University School of Geographical Sciences Fujian Normal University National Land Consolidation Center Ministry of Natural Resources Key Laboratory of Land Consolidation and Rehabilitation Ministry of Natural Resources Key Laboratory of Digital Mapping and Land Information Application Ministry of Natural Resources Department of Geography & Planning University of Toronto Department of Geography The University of Hong Kong

The subtropical region of china possesses abundant forest resources and features a mountainous *** the implementation of policies such as natural forest protection,the Grain for Green Project,and other initiatives since the beginning of the 21st century,coupled with climate change,the forest resources in this region have undergone significant changes compared to historical *** addition,forest resources distributing mainly in mountainous areas also implies that these changes may vary significantly with *** explore the spatiotemporal dynamics of forest distribution in subtropical china since 2000,especially the trend of changes with elevation,we analyzed the data from two land cover products focusing on forest cover and forest *** used a hierarchical approach,in which coarse-classification forest cover data with relatively small uncertainties impose constraints on forest type data with larger uncertainties,to achieve a reasonable balance between obtaining more details and reducing data *** first divided the forest cover data into‘unchanged'and‘changed'*** the constraints by the forest cover results,we further analyzed the‘unchanged'and‘changed'forest *** results indicated that,since the implementation of ecological engineering and management policies,54%of the area in the subtropical region had maintained unchanged forest cover attributes over the past 20 years,which implied the good state of ecological *** results also showed that dynamic conversions existed in the long term between forests and lands for essential production needs like *** elevational variations of forest cover suggested that the dominant changes came from the conversion between forests and croplands in low-elevation regions below 700 m,the conversion between forests and shrublands in mid-elevation regions of 700–1500 m,and the conversion between forests and grasslands in high-elevation regions above 2000 *** the regio

关键词： subtropical china Land cover Forest cover Forest type Elevational distribution

来源：

维普期刊数据库

同方期刊数据库

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

Intraspecific variations in fine root N and P and factors affecting their concentrations in Masson pine plantations across subtropical china

引用

林业研究:英文版 2023年第5期34卷 1463-1473页

作者： Zunji Jian Jin Xu Yanyan Ni Lei Lei Lixiong Zeng Wenfa Xiao Ecology and Nature Conservation Institute Chinese Academy of ForestryKey Laboratory of Forest Ecology and Environment of National Forestry and Grassland AdministrationBeijing 100091People’s Republic of China Co-Innovation Center for Sustainable Forestry in Southern china Nanjing Forestry UniversityNanjing 210037JiangsuPeople’s Republic of China Wuhan Botanical Garden Chinese Academy of SciencesWuhan 430074HubeiPeople’s Republic of China

Fine roots(<2 mm)play vital roles in water and nutrient ***,intraspecific variations in their chemical traits and their controlling mechanisms remain poorly understood at a regional *** study examined these intraspeci... 详细信息

Fine roots(subtropical china and their responses to environmental *** nitrogen(N)and phosphorus(P)concentrations and their mass ratios(N:P)ranged from 3.5 to 11.7 g kg^(-1),0.2 to0.9 g kg^(-1),and 7.8 to 51.6 g kg^(-1),*** three chemical traits were significantly different between sites and in longitudinal patterns across subtropical *** annual temperature was positively related to root N concentration but negatively related to root P *** were significant,negative relationships between clay content and root P concentration and between pH and root N *** N had no significant relationship with root N concentration,while available P was a significantly positive relationship with root P *** combined effects of altitude,climate(temperature and precipitation)and soil properties(pH,clay content,available N and P)explained 26%and 36%of the root N and P concentrations variations,*** environmental variables had direct and indirect effects and exhibited disproportionate levels of total effects on root N and P *** N and P concentrations explained 35%and 65%variations in their mass ratios,*** results highlight different spatial patterns of chemical traits and various environmental controls on root N and P concentrations in these *** cause-effect relationships of root chemical traits with abiotic and biotic factors are needed to understand nutrient uptake strategies and the mechanisms controlling intraspecific variations in plant traits.

关键词： Fine root Chemical traits Environmental variables Pinus massoniana subtropical china

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

East Asian summer monsoon changes in subtropical china since late Pleistocene:Evidence from the Ailuropoda-Stegodon fauna

引用

Journal of Mountain Science 2022年第2期19卷 418-432页

作者： LI Zhi-wen SUN Li LI Bao-sheng WANG Feng-nian DU Ding-ding SONG You-gui ZHANG Hui-Juan CHEN Liu-qin XU Dan School of Environmental and Chemical Engineering Foshan UniversityFoshan 528225China State Key Laboratory of Nuclear Resources and Environment East China University of TechnologyNanchang 330013China School of Geography South China Normal UniversityGuangzhou 510631China School of Geography and Tourism Huizhou UniversityHuizhou 516007China State Key Laboratory of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of SciencesXi'an 710061China

Previous studies on the amplitude of East Asian summer monsoon(EASM)changes mainly focused on northern china(represented by the Loess Plateau).However,a rare investigation centered on the subtropical zone of southern china,where the important route for EASM moved northward or southward,especially addressing a lack of the research on *** Ailuropoda-Stegodon fauna is a representative mammal fauna in southern china since the late *** indicates the southern mid-subtropicaltropical forest environment with tropical climate characteristics,and its southward or northward movements in the subtropical zone imply the changes of EASM *** on previous research,combined with the species characteristics and distribution range of the Ailuropoda-Stegodon fauna with tropical animals during the marine isotope stage 5(MIS5),MIS3,MIS2,and MIS1 Megathermal periods,this paper mainly investigates its evolution and the fluctuations of *** conclusions include:(1)The distribution geometric centers in the MIS5,MIS3,MIS2,and MIS1 Megathermal periods are(26°14′N,111°22′E),(24°35′N,107°30′E),(22°48′N,112°01′E),and(26°19′N,112°25′E),respectively.(2)Compared with the MIS5 period,the EASM of the MIS3 and MIS2 moved 180 km and 380 km southwards,and that of the MIS1 Megathermal period moved about 10 km *** EASM movement indicated by the fauna migration happened synchronous with the climate records of stalagmites in subtropical china,the sporopollen from eastern china,and oxygen isotopes from Sulu *** also correspond to the peaks and valleys of the total solar radiation at 35°N in the winter *** suggests that the migrations of the Ailuropoda-Stegodon fauna are consistent with the changes of the global climate,and the driving force is mainly from the changes of total solar radiation at 35°N in the winter half-year.

关键词： Late Pleistocene to Holocene subtropical china the Ailuropoda-Stegodon fauna Tropical animals migration East Asian summer monsoon changes The total solar radiation

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

Differential Responses of Soil Organic Carbon Fractions and Carbon Turnover Related Enzyme Activities to Wheat Straw Incorporation in subtropical china

引用

Phyton-International Journal of Experimental Botany 2022年第1期91卷 169-183页

作者： Wei Dai Kaikai Fang Hui Gao Jun Wang Petri Penttinen Zhimin Sha Linkui Cao School of Agriculture and Biology Shanghai Jiaotong UniversityShanghai200240China Department of Microbiology College of ResourcesSichuan Agricultural UniversityChengdu611130China

Soil organic carbon(SOC)fractions and C turnover related enzyme activities are essential for nutrient *** is because they are regarded as important indicators of soil fertility and *** measured the effects of wheat straw incorporation on SOC fractions and C turnover related enzyme activities in a paddy field in subtropical *** samples were collected from 0-10 cm and 10-20 cm depths after rice *** total SOC concentrations were higher in the high rate of wheat straw incorporation treatment(NPKS2)than in the not fertilized control(CK)(Psubtropical paddy soils.

关键词： Wheat straw incorporation soil organic carbon fractions soil carbon turnover related enzymes paddy soil subtropical china

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

Nitrogen sink in a small forested watershed of subtropical china

引用

Journal of Environmental Sciences 2011年第3期23卷 468-475页

作者： Laiming Huang State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China Graduate School of Chinese Academy of Sciences Beijing 100049 China

Global nitrogen （N） emission and deposition have been increased rapidly due to massive mobilization of N which may have long- reaching impacts on ecosystems. Many agricultural and forest ecosystems have been identified as secondary N sources. In the present study, the input-output budget of inorganic N in a small forested watershed of subtropical china was investigated. Inorganic N wet deposition and discharge by stream water were monitored from March, 2007 to February, 2009. The concentrations and fluxes of inorganic N in wet precipitation and stream water and net retention of N were calculated. Global N input by dry deposition and biological fixation and N output by denitrification for forested watersheds elsewhere were reported as references to evaluate whether the studied forested watershed is a source or a sink for N. The results show that the inorganic N output by the stream water is mainly caused by NO3-N even though the input is dominated by NH4＋-N. The mean flux of inorganic N input by wet precipitation and output by stream water is 1.672 and 0.537 g N/（***）, respectively, which indicates that most of inorganic N input is retained in the forested watershed. Net retention of inorganic N reaches 1.135 g N/（***） considering wet precipitation as the main input and stream water as the main output, ff N input by dry deposition and biological fixation and output by denitlification are taken into account, this subtropical forested watershed currently acts as a considerable sink for N, with a net sink ranging from 1.309 to 1.913 g N/（m2-yr） which may enhance carbon sequestration of the terrestrial ecosystem.

关键词： forested watershed nitrogen deposition nitrogen sink subtropical china

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

Response of soil fauna to simulated nitrogen deposition: A nursery experiment in subtropical china

引用

Journal of Environmental Sciences 2007年第5期19卷 603-609页

作者： XU Guo-liang MO Jiang-ming FU Sheng-lei PER Gundersen ZHOU Guo-yi XUE Jing-Hua Institute of Ecology South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China Danish Center for Forest Landscape and Planning KVL Hoersholm Kongevej 11 DK-2970 Hoersholm Denmark

We studied the responses of soil fauna to a simulated nitrogen deposition in nursery experimental plots in subtropical china. Dissolved NH4NO3 was applied to the soil by spraying twice per month for 16 months, starting January 2003 with treatments of 0, 5, 10, 15 and 30 gN/（m^2·a）. Soil fauna was sampled after 6, 9, 13 and 16 months of treatment in three soil depths （0-5 cm, 5-10 cm, 10-15 cm）. Soil available N increased in correspondence with the increasing N treatment, whereas soil pH decreased. Bacterial and fungal densities were elevated by the N treatment. Soil fauna increased in the lower nitrogen treatments but decreased in the higher N treatments, which might indicate that there was a threshold around 10 gN/（m^2·a） for the stimulating effects of N addition. The N effects were dependent on the soil depth and sampling time. The data also suggested that the effects of the different N treatments were related to the level of N saturation, especially the concentration of NO3^- in the soil.

关键词： soil fauna N deposition response subtropical china

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

Dynamics of soil inorganic nitrogen and their responses to nitrogen additions in three subtropical forests, south china

引用

Journal of Environmental Sciences 2006年第4期18卷 752-759页

作者： FANG Yun-ting ZHU Wei-xing MO Jiang-ming ZHOU Guo-yi GUNDERSEN Per Dinghushan Forest Ecosystem Research Station South China Botanical Garden Chinese Academy of Sciences Zhaoqing 526070 China Biological Sciences Binghamton University-SUNY Binghamton NY 13902-6000 USA Forest and Landscape Denmark Hoersholm Kongevej 11 2970 Denmark The Graduate School of the Chinese Academy of Sciences Beijing 100039 China

Three forests with different historical land-use, forest age, and species assemblages in subtropical china were selected to evaluate current soil N status and investigate the responses of soil inorganic N dynamics to monthly ammonium nitrate additions. Results showed that the mature monsoon evergreen broadleaved forest that has been protected for more than 400 years exhibited an advanced soil N status than the pine （Pinus massoniana） and pine-broadleaf mixed forests, both originated from the 1930＇s clear-cut and pine plantation. Mature forests had greater extractable inorganic N pool, lower N retention capacity, higher inorganic N leaching, and higher soil C/N ratios. Mineral soil extractable NH4^＋-N and NO3-N concentrations were significantly increased by experimental N additions on several sampling dates, but repeated ANOVA showed that the effect was not significant over the whole year except NH4^＋-N in the mature forest. In contrast, inorganic N （both NH4^＋-N and NO3^--N） in soil 20-cm below the surface was significantly elevated by the N additions. From 42% to 74% of N added was retained by the upper 20 cm soils in the pine and mixed forests, while 0%-70% was retained in the mature forest. Our results suggest that land-use history, forest age and species composition were likely to be some of the important factors that determine differing forest N retention responses to elevated N deposition in the study region.

关键词： N deposition N saturation extractable inorganic N soil solution inorganic N subtropical china

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

Long-term changes of water acidity in an intact forested watershed in south china

引用

Journal of Mountain Science 2021年第12期18卷 3138-3146页

作者： LIU Xiao-dong FENG Ying-jie MO Qi-feng CHU Guo-wei LI Yue-lin ZHANG Qian-mei ZHANG Wei-qiang GAN Xian-hua ZHOU Qing College of Forestry and Landscape Architecture South China Agricultural UniversityGuangzhou 510642China South china Botanical Garden Chinese Academy of SciencesGuangzhou 510650China Guangdong Academy of Forestry Guangzhou 510520China

Acid rain is a global environmental issue and causes serious adverse impacts on natural ecosystems and human *** acid rain and its subsequent impacts have been extensively studied in temperate regions and in big cities globally,but the monitoring of acid rain in non-urban areas in subtropical region is still ***,we analyze 18 years of water acidity observations from a non-urban site in western Pearl River Delta region,south *** 2000 to 2018,annual mean precipitation pH values in the study site showed a marked increase(P<0.0001)from 4.96 in 2000 to 6.88 in *** 18-year dataset of precipitation acidity shows a clear recovery from acid deposition over the annual period,dry seasons and wet *** a year,precipitation pH was relatively lower in dry seasons(5.46±0.95)than in wet seasons(5.80±0.89)during the whole study period,and the seasonal pattern of precipitation pH was amplified during drier years as a strong dilution effect was detected between precipitation amount and its *** pH of surface runoff water(4.74±0.70)was significantly lower than that of precipitation as a result of the regulating effects of the highly acidified soil and the rich humus on the forest *** groundwater pH(6.32±0.63)was significantly higher than the precipitation pH especially during dry *** results of the present study indicated that the groundwater has a strong acid buffer and neutralizing effects and thus plays an important role in supplies of clean water.

关键词： Acid rain Precipitation Runoff water Groundwater subtropical china

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 leaf nutrient traits and photosynthesis of four tree species: effects of elevated [CO_(2)], N fertilization and canopy positions

引用

Journal of Plant Ecology 2012年第4期5卷 376-390页

作者： Juxiu Liu Deqiang Zhang Guoyi Zhou Honglang Duan Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou 510650China

Aims Leaf traits of trees exposed to elevated[CO_(2)]in association with other environmental factors are poorly understood in tropical and subtropical *** goal was to investigate the impacts of elevated[CO_(2)]and N fertilization on leaf traits in southern *** Four tree species,Schima superba *** Champ.(***),Ormosia pinnata(Lour.)Merr(***),Castanopsis hystrix ***.(***)and Acmena acuminatissima(Blume)*** Perry(***)were studied in a factorial combination of atmospheric[CO_(2)](ambient at~390μmol mol^(-1)and elevated[CO_(2)]at~700μmol mol^(-1))and N fertilization(ambient and ambient+100 kg N ha^(-1)year^(-1))in open-top chambers in southern china for 5 *** mass per unit leaf area(LMA),leaf nutrient concentration and photosynthesis(A_(sat))were *** Findings Results indicated that leaf traits and photosynthesis were affected differently by elevated[CO_(2)]and N fertilization among ***[CO_(2)]decreased LMA in all species,while N fertilization did not affect *** mass-based N concentration(N_(M))was significantly greater in *** and *** grown in elevated[CO_(2)]but was lower in *** mass-based P concentration(P_(M))was significantly greater in *** and *** exposed to elevated[CO_(2)]but was lower in ***.N fertilization significantly increased P_(M) in *** but decreased P_(M) in *** stimulation in ***,*** and *** was sustained after 5 years of CO_(2)fumigation.N fertilization did not modify the effects of elevated[CO_(2)]on *** traits(N_(M),N_(A),P_(M),P_(A))and light-saturated photosynthesis were decreased from the upper to lower *** position did not alter the responses of leaf traits and photosynthesis to elevated[CO_(2)].Results suggest that photosynthetic stimulation by elevated[CO_(2)]in native species in subtropical regions may be sustained in th

关键词： photosynthesis elevated CO_(2) nitrogen phosphorus subtropical china

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

Species-specific effects of genetic diversity and species diversity of experimental communities on early tree performance

引用

Journal of Plant Ecology 2017年第1期10卷 252-258页

作者： Xueqin Zeng Walter Durka Markus Fischer Department of Community Ecology(BZF) Helmholtz Centre for Environmental Research-UFZTheodor-Lieser-Str.4Halle D-06120Germany Institute of Plant Sciences University of BernAltenbergrain 21Bern CH-3013Switzerland Kadoorie Farm and Botanic Garden Lam Kam RoadTai PoNew TerritoriesHong Kong German Centre for Integrative Biodiversity Research(iDiv) Halle-Jena-LeipzigDeutscher Platz 5eLeipzig D-04103Germany

Aims Changing biodiversity can affect ecosystem ***,the role of genetic diversity within species,relative to the one of species diversity,has hardly been *** To address the effects of both genetic diversity and species diversity during the important stage of early tree life,we used eight seed families(SF)taken from each of 12 evergreen and deciduous tree species of subtropical forest to perform a factorial *** established 264 communities of 16 trees *** community had a species diversity of either one or four species and a genetic diversity of either one,two or four SF per *** measured plant survival,growth rate,final biomass and herbivory 20 months after *** Findings Species differed from each other in biomass,growth rate,herbivory and survival(P<0.001).Deciduous species tended to have much higher biomass(P<0.1)and experienced higher herbivory(P<0.05)than evergreen *** diversity affected the performance of different species differently(species diversity by species interaction,P<0.001 for all variables but survival).Biomass differed between SF and increasing genetic diversity from one to two,and from two to four,SF per species increased biomass for some species and decreased it for others(P<0.001).Our study showed pronounced species-specific responses of early tree performance to species diversity and less pronounced responses to genetic *** species-specific responses suggest feedbacks of species diversity and genetic diversity on future species composition.

关键词： biodiversity-ecosystem functioning tree biomass herbivory survival subtropical china allometry

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：