检索结果-内蒙古大学图书馆

How do droppings of wintering waterbird accelerate decomposition of Carex cinerascens Kukenth litter in seasonal floodplain Ramsar Site?

引用

WETLANDS ECOLOGY AND MANAGEMENT 2021年第4期29卷 581-597页

作者： Zhang, Quanjun Zhang, Guangshuai Yu, Xiubo Liu, Yu Xia, Shaoxia Meng, Zhujian Xu, Ce Chinese Acad Sci Inst Geog Sci & Nat Resources Res Key Lab Ecosystem Network Observat & Modeling Beijing 100101 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China Natl Marine Environm Monitoring Ctr Dalian 116023 Peoples R China State Ocean Adm Peoples Republ China Key Lab Sea Field Management Technol Dalian 116023 Peoples R China

The decomposition of wetland plant litter is pivotal in the functioning of wetland ecosystems in terms of organic matter mineralization progress and nutrient cycling. Aiming to investigate the effects of the droppings of wintering herbivorous waterbirds on the decomposition of Carex cinerascens Kukenth litter a newly designated Ramsar Site, decomposition patterns of three types of samples were characterized and compared by waterbird dropping addition and litterbag in situ experiment. The three types of samples are OCL (only C. cinerascens litter), OWD (only waterbird droppings) and CMD (C. cinerascens litter mixed with waterbird droppings), respectively. A total of 105 decomposition bags were placed and the experiment lasted 150 days. The results showed that the average decay rate of C. cinerascens cellulose increased by approximately 32.12% by the addition of bird droppings, while the C. cinerascens lignin decay rate increased by approximately 83.05%. And the release of carbon, nitrogen and phosphorous of C. cinerascens increased by approximately 18.3%, 61.09%, and 66.71%, respectively. We concluded that the addition of waterbird droppings significantly accelerated the decomposition of C. cinerascens litter and the release of carbon, nitrogen, and phosphorus. We have a preliminary deduction that waterbird droppings (1) altered the original stoichiometric ratio of the litter, (2) increased the available nutrient content, (3) increased the colonization ability of the microorganisms, and (4) stimulated the production of a series of extracellular degradation enzymes. This study provides a thinking that the important role of waterbirds should be given full attention in wetland restoration planning and management.

关键词： Poyang Lake Wetlands Nutrient cycling Migratory birds Freshwater ecosystem Cellulose Lignin

来源：评论

学校读者我要写书评

暂无评论

An empirical approach to predict regional organic carbon in deep soils

引用

Science China Earth Sciences 2023年第3期66卷 583-593页

作者： Jingjing WANG Xiaorong WEI Xiaoxu JIA Mingbin HUANG Zhipeng LIU Yufei YAO Ming’an SHAO State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F UniversityYangling 712100China Institute of Soil and Water Conservation Ministry of Water Resources and Chinese Academy of SciencesYangling 712100China CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environmental Sciences Nanjing Agricultural UniversityNanjing 210095China College of Urban and Environmental Sciences Northwest UniversityXi’an 710127China

Deep soil organic carbon(SOC)plays an important role in carbon *** predicting deep SOC at the regional scale is crucial for the accurate assessment of carbon sequestration potential in soils but has been challenging for a ***,we developed a depth distribution function-based empirical approach to predict SOC in deep soils at the regional *** validated this approach with a dataset from four regions of the world and examined the application of this approach in China’s Loess *** found that among the reported depth distribution functions describing vertical patterns of SOC,the negative exponential function performed best in fitting SOC along the soil profile in various ***,the parameters(i.e.,Ceand k)of the negative exponential function were linearly correlated to surface SOC(0–20 cm)and the changing rates of SOC within the topsoil(0–40 cm).Based on the above relationships,the empirical equations for predicting the negative exponential parameters are *** validation results from site-specific and regional dataset showed that combining the negative exponential function and such empirical equations can precisely predict SOC concentration in soils down to 500 cm *** study provides a simple,rapid and accurate method for predicting deep soil SOC at the regional scale,which could simplify the assessment of deep soil SOC in various regions.

关键词： Deep SOC Empirical approach Negative exponential function Depth distribution Spatial pattern

来源：评论

学校读者我要写书评

暂无评论

Nitrogen acquisition strategies used by Leymus chinensis and Stipa grandis in temperate steppes

引用

BIOLOGY AND FERTILITY OF SOILS 2016年第7期52卷 951-961页

作者： Wang, Ruixue Tian, Yuqiang Ouyang, Shengnan Xu, Xingliang Xu, Fanzhen Zhang, Yong Beijing Normal Univ CHESS State Key Lab Earth Surface Proc & Resource Ecol Beijing 100875 Peoples R China Chinese Acad Sci Inst Geog Sci & Nat Resources Res Key Lab Ecosystem Network Observat & Modeling Beijing 100101 Peoples R China Laibin Inst Agr Sci Laibin Guangxi Provinc Peoples R China Chinese Acad Agr Sci Inst Grassland Res Hohhot 010010 Peoples R China

Leymus chinensis and Stipa grandis are two important plant species of temperate steppes in Inner Mongolia of North China. They differ in their life forms, e.g., L. chinensis is a type of rhizomatous clonal grass, whereas S. grandis is a type of tussock grass. Here we hypothesize that both plant species possess distinct nitrogen (N) acquisition strategies for their growth and survival. To test this hypothesis, we conducted a four-factor experimental field study using a short-term (three hours) N-15 labeling technique in two plant communities mono-dominated by L. chinensis and S. grandis of the temperate steppes over two months (July and August) and at two soil depths. In both of communities, L. chinensis and S. grandis directly absorbed all three of the common forms of N, including substantial portions of N-derived from glycine (organic and inorganic forms) ranged from 2.7 to 17.8 %, although they absorbed more inorganic N. Nitrogen uptake rates showed significant effects of communities, months, soil depths, and N forms. The uptake rate was higher in August than in July and at 0-5 cm than at 5-15 cm soil depths. L. chinensis and S. grandis showed different preference on N form across months. L. chinensis shifted its uptake pattern from more nitrate (NO3 (-)) in July to more ammonium (NH4 (+)) in August, whereas S. grandis took up comparable NH4 (+) and NO3 (-) in both months. In general, L. chinensis showed a more flexible N acquisition strategy and S. grandis performed a more concentrated and relatively more stable N acquisition strategy. The distinct N acquisition strategies used by L. chinensis and S. grandis varied greatly across different months and soil depths. These findings are more helpful in further understanding the plasticity of nutrient utilization issues of different plant species in response to N-limited conditions of grassland ecosystems.

关键词： Organic nitrogen Nitrogen acquisition strategies Life form Monodominant community Temperate steppes

来源：评论

学校读者我要写书评

暂无评论

Impact of land use conversion on soil organic carbon stocks in an agro-pastoral ecotone of Inner Mongolia

引用

Journal of Geographical Sciences 2017年第8期27卷 999-1010页

作者： ZHAO Wei HU Zhongmin LI Shenggong GUO Qun YANG Hao ZHANG Tonghui Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China University of Chinese Academy of Sciences Beijing 100049 China Naiman Desertification Research Station Northwest Institute of Eco-Environment and Resources CAS Lanzhou 730000 China

Soil organic carbon （SOC） stocks in terrestrial ecosystems vary considerably with land use types. Grassland, forest, and cropland coexist in the agro-pastoral ecotone of Inner Mongolia, China. Using SOC data compiled from literature and field investigations, this study compared SOC stocks and their vertical distributions among three types of ecosystems. The results indicate that grassland had the Largest SOC stock, which was 1.5- and 1.8-folds more than stocks in forest and cropland, respectively. Relative to the stock in 0-100 cm depth, grassland held more than 40% of its SOC stock in the upper 20 cm soil layer; forest and cropland both held over 30% of their respective SOC stocks in the upper 20 cm soil layer. SOC stocks in grazed grasslands were remarkably promoted after -〉20 years of grazing ex- clusion. Conservational cultivation substantially increased the SOC stocks in cropland, espe- cially in the 0-40 cm depth. Stand ages, tree species, and forest types did not have obvious impacts on forest SOC stocks in the study area likely due to the younger stand ages. Our study implies that soil carbon loss should be taken into account during the implementation of ecological projects, such as reclamation and afforestation, in the arid and semi-arid regions of China.

关键词： soil organic carbon soil carbon profile land use change grazing tillage forest age

来源：评论

学校读者我要写书评

暂无评论

Evolution history dominantly regulates fine root lifespan in tree species across the world

引用

Forest ecosystems 2024年第4期11卷 516-525页

作者： Xingzhao Huang Zhouying Lu Fangbing Li Yang Deng Fangfang Wan Quancheng Wang Fousseni Folega Jinsong Wang Zijian Guo Anhui Province Key Laboratory of Forest Resources and Silviculture Anhui Agricultural UniversityHefei 230036China State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityHangzhou 311300China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Laboratory of Botany and Plant Ecology(LBEV) University of LomeTogo01PoBox 1515LomeTogo State Key Laboratory of Efficient Production of Forest Resources Beijing Forestry UniversityBeijing 100083China School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China

Understanding the drivers of variations in fine root lifespan is key to informing nutrient cycling and productivity in terrestrial ***,the general patterns and determinants of forest fine root lifespan at the global scale are still *** compiled a dataset of 421 fine root lifespan observations from 76 tree species globally to assess phylogenetic signals among species,explored relationships between fine root lifespan and biotic and abiotic factors,and quantified the relative importance of phylogeny,root system structure and functions,climatic and edaphic factors in driving global fine root lifespan ***,fine root lifespan showed a clear phylogenetic signal,with gymnosperms having a longer fine root lifespan than *** root lifespan was longer for evergreens than deciduous ***(ECM)plants had an extended fine root lifespan than arbuscular mycorrhizal(AM)*** different climatic zones,fine root lifespan was the longest in the boreal zone,while it did not vary between the temperate and tropical *** root lifespan increased with soil depth and root ***,the analysis of relative importance indicated that phylogeny was the strongest driver influencing the variation in forest fine root lifespan,followed by soil clay content,root order,mean annual temperature,and soil depth,while other environmental factors and root traits exerted weaker *** results suggest that the global pattern of fine root lifespan in forests is shaped by the interplay of phylogeny,root traits and environmental *** findings necessitate accurate representations of tree evolutionary history in earth system models to predict fine root longevity and its responses to global changes.

关键词： Fine root lifespan Trees Phylogeny Root order Soil property Climatic factors

来源：评论

学校读者我要写书评

暂无评论

Human activities aggravate nitrogen-deposition pollution to inland water over China

引用

National Science Review 2020年第2期7卷 430-440页

作者： Yang Gao Feng Zhou Philippe Ciais Chiyuan Miao Tao Yang Yanlong Jia Xudong Zhou Butterbach-Bahl Klaus Tiantian Yang Guirui Yu Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Laboratoire des Sciences du Climat et de l'Environnement CEA CNRS UVSQ State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal University State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Center for Global Change and Water Cycle Hohai University Institute for Meteorology and Climate Research Atmospheric Environmental Research Karlsruhe Institute of Technology Department of Civil and Environmental Engineering University of California

In the past three decades, China has built more than 87 000 dams with a storage capacity of ≈6560 km3and the total surface area of inland water has increased by 6672 km2. Leaching of N from fertilized soils to rivers is the main source of N pollution in China, but the exposure of a growing inland water area to direct atmospheric N deposition and N leaching caused by N deposition on the terrestrial ecosystem, together with increased N deposition and decreased N flow, also tends to raise N concentrations in most inland waters. The contribution of this previously ignored source of N deposition to freshwaters is estimated in this study, as well as mitigation strategies. The results show that the annual amounts of N depositions ranged from 4.9 to 16.6 kg · ha-1· yr-1in the 1990 s to exceeding 20 kg · ha-1· yr-1in the 2010 s over most of regions in China, so the total mass of N(the net contribution of N deposition to the increase in N concentration) for lakes, rivers and reservoirs change from 122.26 Gg N · yr-1in the 1990 s to 237.75 Gg N· yr-1in the 2010 s. It is suggested that reducing the N deposition from various sources, shortening the water-retention time in dams and decreasing the degree of regulation for rivers are three main measures for preventing a continuous increase in the N-deposition pollution to inland water in China.

关键词： N deposition N concentration dam water area human activity

来源：评论

学校读者我要写书评

暂无评论

Changes of Soil Erosion and Possible Impacts from ecosystem Recovery in the Three-River Headwaters Region, Qinghai, China from 2000 to 2015

引用

Journal of Resources and Ecology 2019年第5期10卷 461-471页

作者： WANG Zhao WANG Junbang Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China School of Earth Science and Resources China University of Geosciences(Beijing)Beijing 100083China

Soil erosion poses a great threat to the sustainability of the ecological environment and the harmonious development of human *** revised universal soil loss equation(RUSLE)was used to quantify soil erosion in the Three-River Headwaters region(TRH),Qinghai,China from 2000 to *** possible effects of an ecosystem restoration project on soil erosion were explored against the background of climatic changes in the study *** model was validated with on-ground observations and showed a satisfactory performance,with a multiple correlation coefficient of 0.62 from the linear regression between the estimations and *** soil erosion modulus in 2010–2015 increased 6.2%,but decreased 1.2%compared with those in the periods of 2000–2005 and 2005–2010,*** on the method of overlay analysis,the interannual change of the estimated soil erosion was dominated by climate(about 64%),specifically by precipitation,rather than by vegetation coverage(about 34%).Despite some uncertainties in the model and data,this study quantified the relative contribution of ecological restoration under global climatic change;meanwhile the complexity,labor-intensiveness and long-range character of ecological restoration projects have to be ***-ground observations over the long-term,further parameterization,and data inputs with higher quality are necessary and essential for decreasing the uncertainties in the estimations.

关键词： RUSLE model soil erosion climate changes ecosystem protection and recovery

来源：评论

学校读者我要写书评

暂无评论

modeling gross primary production of a temperate grassland ecosystem in Inner Mongolia, China, using MODIS imagery and climate data

引用

Science China Earth Sciences 2008年第10期51卷 1501-1512页

作者： WU WeiXing WANG ShaoQiang XIAO XiangMing YU GuiRui FU YuLing HAO YanBin Qianyanzhou Ecological Experimental Station Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Graduate University of Chinese Academy of Sciences Beijing 100049China Institute for the Study of Earth Oceans and SpaceUniversity of New HampshireDurhamNH 03824USA Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Re-searchChinese Academy of SciencesBeijing 100101China Laboratory of Quantitative Vegetation Ecology Institute of BotanyChinese Academy of SciencesBeijing 100093China

Carbon fluxes in temperate grassland ecosystems are characterized by large inter-annual variations due to fluctuations in precipitation and land water availability. Since an eddy flux tower has been in operation in the Xilin Gol grassland, which belongs to typical temperate grassland in North China, in this study, observed eddy covariance flux data were used to critically evaluate the biophysical performance of different remote sensing vegetation indices in relation to carbon fluxes. Furthermore, vegetation photosynthesis model (VPM) was introduced to estimate gross primary production (GPP) of the grassland ecosystem for assessing its dependability. As defined by the input variables of VPM, Moderate Resolution Imaging Spectroradimeter (MODIS) and standard data product MOD09A1 were downloaded for calculating enhanced vegetation index (EVI) and land surface water index (LSWI). Measured air temperature (Ta) and photosynthetically active radiation (PAR) data were also included for model simulating. Field CO2 flux data, during the period from May, 2003 to September, 2005, were used to estimate the “observed” GPP (GPP obs) for validation. The seasonal dynamics of GPP predicted from VPM (GPP VPM) was compared quite well (R 2=0.903, N=111, p<0.0001) with the observed GPP. The aggregate GPP VPM for the study period was 641.5 g C·m?2, representing a ～6% over-estimation, compared with GPP obs. Additionally, GPP predicted from other two typical production efficiency model (PEM) represents either higher overestimation or lower underestimation to GPP obs. Results of this study demonstrate that VPM has potential for estimating site-level or regional grassland GPP, and might be an effective tool for scaling-up carbon fluxes.

关键词： GPP eddy covariance remote sensing Xilin Gol

来源：评论

学校读者我要写书评

暂无评论

NITROUS OXIDE EMISSIONS FROM AGRICULTURE IN CHINA

NITROUS OXIDE EMISSIONS FROM AGRICULTURE IN CHINA

引用

2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Chao Fu Guirui Yu Randall W.Gentry Jie Zhuang Graduate University of Chinese Academy of Sciences Beijing 100039China Synthesis Research Center of Chinese Ecosystem Research NetworkKey Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Institute for a Secure and Sustainable EnvironmentThe University of TennesseeKnoxvilleTN37996-1410United States Synthesis Research Center of Chinese Ecosystem Research Network Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

来源：评论

学校读者我要写书评

暂无评论

modeling EVAPOTRANSPIRATION AND ITS COMPONENTS IN SUBTROPICAL CONIFEROUS FOREST BASED ON REMOTE SENSING AND METEOROLOGICAL DATA

MODELING EVAPOTRANSPIRATION AND ITS COMPONENTS IN SUBTROPICA...

引用

2010年亚洲通量网会议(Asiaflux workshop2010)

作者： Huanqi Wei Honglin He Min Liu Li Zhang Guirui Yu Hui-min Wang Ying Liu 3Graduate University of Chinese Academy of Sciences BeijingChina College of Geography and EnvironmentJiangxi Normal UniversityNanchangChina Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina College of Geography and EnvironmentJiangxi Normal UniversityNanchangChina Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijingChina

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：