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Stand biomass of Pinus sylvestris var. mongolica plantations benefits from high density monocultures in the boreal zone

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Forest Ecosystems 2024年第5期11卷 650-658页

作者： Bingming Chen Shensi Liu Jinghua Yu Yanqing Huang Shuai Yu Huanchu Liu Tianyu Zhang Xiangdong Liu Guangze Jin Wei Chen xingyuan he CAS Key Laboratory of Forest Ecology and Silviculture Institute of Applied EcologyChinese Academy of SciencesShenyang110016China University of Chinese Academy of Sciences Beijing100049China Shenyang Arboretum Chinese Academy of SciencesShenyang110016China Liaoning Shenyang Urban Ecosystem National Observation and Research Station Shenyang 110164China College of Forestry Shenyang Agricultural UniversityShenyang110866China Center for Ecological Research Northeast Forestry UniversityHarbin150040China Key Laboratory of Sustainable Forest Ecosystem Management Ministry of EducationNortheast Forestry UniversityHarbin150040China Northeast Asia Biodiversity Research Center Northeast Forestry UniversityHarbin150040China

Pinus sylvestris ***(***)plantations are extensively established in the boreal *** stand biomass of these plantations can effectively enhance carbon stock,which is crucial for mitigating climate ***,the current understanding of optimizing plantation strategies to maximize stand biomass is primarily derived from experiments in tropical and subtropical zones,which is difficult to extend to the boreal due to substantial climatic *** on a comprehensive dataset from 1,076 sample plots of *** plantations in the boreal zone of China,we evaluated the effects of tree species richness and stand density on tree height,diameter at breast height(DBH),and stand biomass to investigate the optimal plantation ***,we examined how these effects changed with stand age and investigated their relative *** found that monocultures at a high stand density of 2,000–2,500ha^(−1) were the optimal plantation strategy to maximize stand biomass(107.5Mg·ha^(−1)),and this held true at almost all stand ***,this strategy resulted in low species richness and small individual trees(10.6m height and 9.8cm DBH),thus presenting a *** addition,as stand age increased,the effect of tree species richness on stand biomass shifted from positive to negative,but the effect of stand density was always ***,stand age had the greatest effect on stand biomass,followed by stand density and then tree species *** findings reveal a distinct plantation strategy for optimizing stand biomass of *** plantations in the boreal *** importantly,this study highlights that(1)maximizing stand biomass in the boreal zone may compromise tree species richness;(2)net effects of tree species richness on stand biomass are not always positive,as negative selection effects offset positive complementary effects.

关键词： Boreal forests Cold region Forestry application Mongolian Scots pine Planting strategy Tree diversity

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Foliar C/N stoichiometry in urban forest trees on a global scale

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Journal of Forestry Research 2021年第4期32卷 1429-1443页

作者： Hongxu Wei xingyuan he Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102People’s Republic of China University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

Foliar C/N stoichiometry is an indicator of geochemical cycling in forest ecosystems,but the driving changes for its response to urbanization at the wide scale is not *** this study,data on tree-leaf C and N stoichiometry were collected in papers from across 105 tree species from 82 genera and 46 *** foliar C/N of urban forest trees varied among different climate zones and tree taxonomic variation and tended to be higher in trees of urban forests near the equator and in eastern regions,mainly driven by lowered foliar N *** the foliar C concentration nor foliar C/N for trees of urban forests was statistically higher than those of rural *** variation by taxonomic classification,C_4 species Amaranthus retroflexus and Chenopodium ambrosoides(Amaranthaceae) had lower foliar C/N than did other species and *** guianensis(Primulaceae) and Myconia fallax(Asteraceae) had the highest foliar C/***,urbanization has not caused a significant response in forest trees for foliar C/*** change in foliar N concentration was globally the main force driving of the differences in foliar C/N for most tree species in urban *** work is needed on foliar C/N in trees at cities in polar regions and the Southern hemisphere.

关键词： Ecosystem cycling City habitat Isometric scaling Suburb Remote town N deposition

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等保2.0下堡垒机在高职信息系统安全管理中的应用

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石家庄铁路职业技术学院学报 2024年第3期23卷 82-85页

作者：范春荣何婞媛石家庄铁路职业技术学院河北石家庄050041

等保2.0是高职院校网络安全建设的具体依据,为达到等保2.0关于信息系统安全运维管理的相关要求,需要部署堡垒机实现对信息资产、运维人员访问身份和权限的集中管控和安全审计。通过提出规范信息系统运维管理的必要性,介绍堡垒机作为运... 详细信息

等保2.0是高职院校网络安全建设的具体依据,为达到等保2.0关于信息系统安全运维管理的相关要求,需要部署堡垒机实现对信息资产、运维人员访问身份和权限的集中管控和安全审计。通过提出规范信息系统运维管理的必要性,介绍堡垒机作为运维管理中的重要设备可以实现的功能,及其在信息系统安全管理中的具体应用。

关键词：等保2.0 堡垒机信息系统安全

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Recreational Attractiveness of Urban Parks and Implications for Their Management:A Case Study in Changchun,China

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Chinese Geographical Science 2022年第3期32卷 456-466页

作者： MAO Zhixia WANG Wenjie REN Zhibin ZHANG Dan he xingyuan Northeast Institute of Geography and Agroecology Chinese Academy of SciencesChangchun 130102China University of Chinese Academy of Sciences Beijing 100049China

Urban parks are an important part of urban ecosystems and also provide recreational services for urban ***,it is still unclear how the recreational attractiveness of urban parks can be *** this study,12 typical parks in Changchun,China were selected for evaluation of their recreational *** built a recreational attractiveness evaluation system based on the analytical hierarchy process(AHP)to produce a composite evaluation *** method included:1)the landscape quality of the parks;2)the recreational facilities;3)the conditions of the area;and 4)the accessibility of the *** results showed that Nanhu Park,Children’s Park,Shengli Park,and Jingyuetan Forest Park had high recreational attractiveness,whereas Linyuan Park had the lowest attractiveness among the 12 *** results agreed with the information obtained from a field survey of the actual recreational and revisit rates,which showed that the evaluation index is *** analysis showed that the landscape quality and recreational facilities of parks had a direct effect on their recreational attractiveness.A negative correlation was found between the accessibility of a park and its recreational *** conclude that if the scenery and facilities are not as good as a visitor expects,then they may choose to visit a different park,even if it takes a longer time to reach.

关键词： questionnaire survey analytic hierarchy process recreational attractiveness management implications perception of residents urban parks

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Assessing outdoor air quality vertically in an urban street canyon and its response to microclimatic factors

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Journal of Environmental Sciences 2023年第2期124卷 923-932页

作者： Chunping Miao Shuai Yu Yue Zhang Yuanman Hu xingyuan he Wei Chen CAS Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China Shenyang Arboretum Chinese Academy of SciencesShenyang 110016China

The vertical distribution of air pollutants in urban street canyons is closely related to residents’***,the vertical air quality in urban street canyons has rarely been assessed using field observations obtained throughout the ***,this study investigated the seasonal and annual concentrations of particulate matter(PM2.5 and PM10),CO,NO_(2),SO_(2),O_(3),air quality index,and their responses to microclimatic factors at three height levels(1.5,27,and 69 m above street level)in an urban street *** PM concentration was higher at 27 m than at 1.5 m in winter,whereas the situation was reversed in other *** was found that photochemical pollutants such as NO_(2) and O_(3) were the primary pollutants in the urban street *** days on which O3 was the primary pollutant at the height of 1.5 m accounted for 81.07% of the entire *** days on which NO_(2) was the primary pollutant at the height of 27 and 69 m accounted for 82.49% and 72.33%of the entire year,*** higher concentrations of NO2 and O_(3) were found at the height of 27 m than at 69 ***-canyon concentrations of NO_(2) and O_(3) were strongly correlated with air temperature,wind speed,and wind direction,which played important roles in photochemical reactions and pollutant dispersion.

关键词： Urban air pollution Built environment Urban form Urbanization

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Prediction of Suitable Habitat for Lycophytes and Ferns in Northeast China: A Case Study on Athyrium brevifrons

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Chinese Geographical Science 2019年第6期29卷 1011-1023页

作者： LI Yan CAO Wei he xingyuan CheN Wei XU Sheng Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016China University of Chinese Academy of Sciences Beijing 100049China Shenyang Arboretum Chinese Academy of SciencesShenyang 110016China Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China

Suitable habitat is vital for the survival and restoration of a *** the suitable habitat range for lycophytes and ferns is prerequisite for effective species resource conservation and recovery *** this study, we took Athyrium brevifrons as an example, predicted its suitable habitat using a Maxent model with 67 occurrence data and nine environmental variables in Northeast *** area under the curve(AUC) value of independent test data, as well as the comparison with specimen county areal distribution of *** exhibited excellent predictive *** type of environmental variables showed that precipitation contributed the most to the distribution prediction, followed by temperature and *** contribution and permutation importance both indicated that precipitation of driest quarter(Bio17) was the key factor in determining the natural distribution of ***, the reason could be proved by the fern gametophyte *** analysis of high habitat suitability areas also showed the habitat preference of ***: comparatively more precipitation and less fluctuation in the driest *** Mountains, covering almost all the high and medium habitat suitability areas, provide the best ecological conditions for the survival of ***, and should be considered as priority areas for protection and restoration of the wild *** potential habitat suitability distribution map could provide a reference for the sustainable development and utilisation of *** resource, and Maxent modelling could be valuable for conservation management planning for lycophytes and ferns in Northeast China.

关键词： Athyrium brevifrons lycophytes and ferns Maxent suitable habitat Northeast China gametophyte

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Biomass accumulation and nutrient uptake of 16 riparian woody plant species in Northeast China

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Journal of Forestry Research 2014年第4期25卷 773-778页

作者： Shuai Yu Wei Chen xingyuan he Zhouli Liu Yanqing Huang State Key Laboratory of Forest and Soil Ecology Institute of Applied Ecology Chinese Academy of Sciences University of Chinese Academy of Sciences

Our research focused on eutrophication control and species screening for riparian zone vegetation restoration in the upstream reach of the Hun River. We studied 16 hardwood plant species to investigate nutrient concentrations and nitrogen and phosphorus accumulations. After about 120 days of growth in pots, these 16 species varied in dry matter biomass, ranging from 15.13 to 637.16 g. Total nitrogen （TN） and total phosphorus （TP） concentrations and distribution in roots, stems and foliage differed both within and between tested species. Mean TN and TP accumulation ranged from 0.167 to 14.730 g per plant and from 0.016 to 1.20 g, respectively. All 16 species, but especially Lespedeza bicolor, Robinia pseudoacacia and Sorbaria sorbifolia had strong potential to remove TN and TP from soil and could be widely utilized for the restora- tion of destroyed riparian zones in northeast China.

关键词： Nitrogen phosphorous ecological restoration foliage

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Land Use/Cover Change and Its Policy Implications in Typical Agriculture-forest Ecotone of Central Jilin Province,China

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Chinese Geographical Science 2021年第2期31卷 261-275页

作者： DONG Yulin REN Zhibin FU Yao YANG Ran SUN Hongchao he xingyuan Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China University of Chinese Academy of Sciences Beijing 100049China School of Geography and Engineering of Land Resources Yuxi Normal UniversityYuxi 653100China College of Earth Sciences Jilin UniversityChangchun 130012China

During the 21st century,policies toward agriculture,forestry,and urbanization have emerged to ensure food security,ecological restoration,and human well-being by managing land in Northeast ***,the integrated effects and relationships of various policies are still not well *** study observed the land use land cover changes in Central Jilin from 2000 to 2019 and,by considering policy involvement,aimed to understand the effects and trade-offs of *** showed that the cropland,including dryland and rice paddy,and the forest,including coniferous forest and deciduous forest,are dominant land types in Central *** 2000–2019,the land changed diversely,of which the main changes were the expanded dryland(+0.43 million ha),the increased deciduous forest(+22 million ha),the decreased coniferous forest(–0.08 million ha),and the expanded urban settlement(+0.04 million ha).With these changes,despite the unit grain yield showing a rising trend,the yield contribution of Central Jilin to the national total *** poor cultivating structure made for the cropland expansion and reduced the implementation space of environmental restoration projects such as the Grain to ***,in Central Jilin that transits from the agri-food production zone to the eco-regulation zone,environmental projects coexisted in a trade-off manner with agricultural policies that aim to liberate agricultural *** the key urban agglomerations of Central Jilin,the increase in the proportion of green space improved the thermal environment and carbon *** gross domestic product of the large city and its local proportion also *** improvements benefited from the promotion of development policies and urbanization policies at key time *** the future,it is necessary to coordinate agricultural policies and environmental projects and promote the progress of small-and medium-sized cities to ensure the equality of regional *** study

关键词： land use land cover(LULC) policy agriculture-forest ecotone urbanization Northeast China

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Effects of Vegetation Type on Surface Elevation Change in Liaohe River Delta Wetlands Facing Accelerated Sea Level Rise

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Chinese Geographical Science 2017年第5期27卷 810-817页

作者： WANG Guodong WANG Ming JIANG Ming LYU Xianguo he xingyuan WU Haitao Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Key Laboratory of Wetland Ecology and Vegetation Restoration of National Environmental Protection Northeast Normal University

Rising sea levels threaten the sustainability of coastal wetlands around the globe. The ability of coastal marshes to maintain their position in the intertidal zone depends on the accumulation of both organic and inorganic materials, and vegetation is important in these processes. To study the effects of vegetation type on surface elevation change, we measured surface accretion and elevation change from 2011 to 2016 using rod surface elevation table and feldspar marker horizon method （RSET-MH） in two Phragmites and two Suaeda marshes in the Liaohe River Delta. The Phragmites marshes exhibited higher rates of surface accretion and elevation change than the Suaeda marshes. The two Phragmites marsh sites had average surface elevation change rates at 8.78 mm/yr and 9.26 mm/yr and surface accretion rates at 17.56 mm/yr and 17.88 mm/yr, respectively. At the same time, the two Suaeda marsh sites had average surface elevation change rates at 5.77 mmJyr and 5.91 mm/yr and surface accretion rates at 13.42 mm/yr and 14.38 mm/yr, respectively. The elevation change rates in both the Phragmites marshes and the Suaeda marshes in the Liaohe River Delta could keep pace and even continue to gain elevation relative to averaged sea level rise in the Bohai Sea reported by the 2016 State Oceanic Administration, Peo- ple＇s Republic of China projection （2.4-5.5 mm/yr） in current situations. Our data suggest that vegetation is important in the accretionary processes and vegetation type could regulate the wetland surface elevation. However, the vulnerability of coastal wetlands in the Liaohe River Delta need further assessment considering the accelerated sea level rise, the high rate of subsidence, and the declining sediment delivery, especially for the Suaeda marshes.

关键词： sea level rise wetland elevation surface accretion Phragmites marsh Suaeda marsh Liaohe River Delta

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Effects of Climate Warming on Phenological Characteristics of Urban Forest in Shenyang City,China

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Chinese Geographical Science 2016年第1期26卷 1-9页

作者： he xingyuan XU Sheng XU Wenduo CheN Wei HUANG Yanqing WEN Hua State Key Laboratory of Forest and Soil Ecology Institute of Applied EcologyChinese Academy of Sciences Northeast Institute of Geography and Agroecology Chinese Academy of Sciences

Change in plant phenology is one of the most sensitive ecological responses to climate warming. Little information is known about the effects of climate warming on phenology of urban tree species in the northern forest of China. In this study, we investigated the phenological characteristics of the main tree species in the urban forest of Shengyang City in China and the correlation between phenology and atmospheric temperature from the discontinuous data during past 42 years over three time periods(from 1962 to 1965, 1977 to 1978, and 2000 to 2005). The results showed that the annual average temperature in Shenyang City showed an increasing trend and increased by 0.96℃ from 1962 to 2005 due to climate warming. The germination phenology of the urban trees was negatively correlated with the temperature in winter and early spring. The leafing phenology was mainly influenced by the temperature in spring before leafing. Influenced by climate warming, the germination, leafing, and flowering phenologies of this urban forest in 2005 were 14, 13, and 10 days earlier than those in 1962, respectively. We inferred that further warming in winter might prolong the growing season of urban trees in the northern forest of China.

关键词： global climate change global warming plant phenology urban forest Shengyang City

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