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Long-term thinning decreases the contribution of heterotrophic respiration to soil respiration in subalpine plantations

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Journal of forestry Research 2024年第3期35卷 189-204页

作者： Longfei Chen Zhibin He Wenzhi Zhao Xi Zhu Qin shen Mingdan song Zhengpeng Li Junqia Kong shuping Yang Yuan Gao Northwest Institute of Eco-Environment and Resources Chinese Academy of SciencesLanzhou 730000People's Republic of China state forestry administration key laboratory of forest Resources and Environmental Management Beijing Forestry UniversityBeijing 100083People's Republic of China Academy of Agriculture and forestry sciences Qinghai UniversityXining 810000People's Republic of China College of Landscape Architecture Zhejiang A&F UniversityHangzhou 310000People's Republic of China

Interest in the dynamics of soil respiration(R_(s))in subalpine forest ecosystems is increasing due to their high soil carbon density and potential sensitivity to environmental ***,as a principal silvicultural practice,the long-term impacts of thinning on R_(s) and its heterotrophic and autotrophic respiration components(R_(h) and Ra,respectively)in subalpine plantations are poorly understood,espe-cially in winter.A 3-year field observation was carried out with consideration of winter CO_(2) efflux in middle-aged sub-alpine spruce plantations in northwestern China.A trench-ing method was used to explore the long-term impacts of thinning on Rs,Rn and R_(a).seventeen years after thinning,mean annual Rs,Rn and R_(a) increased,while the contribu-tion of R_(h) to R_(s) decreased with thinning *** significantly decreased winter R,because of the reduction in R_(n) but had no significant effect on *** temperature sensitivity(Q_(10))of R_(h) and R_(a) also increased with thinning intensity,with lower Q_(10) values for R_(h)(2.1-2.6)than for Ra(2.4-2.8).The results revealed the explanatory variables and pathways related to R_(n) and R_(a) *** increased soil moisture and nitrate nitrogen(NO_(3)^(-)-N),and the enhanced nitrogen and water availability promoted R_(h) and R_(a) by improving fine root biomass and microbial *** results highlight the positive roles of NO_(3)^(-)-N in stimulating R_(s) components following long-term ***,applications of nitrogen fertilizer are not recommended while thinning subalpine spruce plantations from the perspective of reducing soil CO_(2) *** increased Q_(10) values of R_(s) components indicate that a large increase in soil CO_(2) emissions would be expected following thinning because of more pronounced climate warming in alpineregions.

关键词： Heterotrophic respiration Autotrophic respiration Long-term thinning impacts Cold seasons subalpine plantations Temperature sensitivity

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Friend or foe? Using eye-tracking technology to investigate the visual discrimination ability of giant pandas

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Current Zoology 2024年第4期70卷 430-439页

作者： Xinrui Huang Guo Li Guiquan Zhang Zixiang Li Lin Zhao Mengdie Zhu Qinghua Xiang Xuefeng Liu Mei Tian Hemin Zhang Christina D.Buesching Dingzhen Liu Ministry of Education Key Laboratory of Biodiversity Science and Ecological EngineeringDepartment of EcologyCollege of Life SciencesBeijing Normal UniversityBeijing 100875China key laboratory of state forestry and Grassland administration on Conservation Biology of Rare Animals in the Giant Panda National Park China Conservation and Research Center for the Giant PandaSichuan 623004China school of Computer and Information Technology Beijing Jiaotong UniversityBeijing 100044China Beijing key laboratoryof CaptiveWildlife Technology Beijing ZooBeijing100044China Department of Biology Irving K.Barber Faculty of ScienceThe University of British ColumbiaOkanagan CampusKelownaBCCanada

The role that visual discriminative ability plays among giant pandas in social communication and individual discrimination has received less attention than olfactory and auditory ***,we used an eye-tracker technology to investigate pupil fixation patterns for 8 captive male giant pandas Ailuropoda *** paired images(N=26)of conspecifics against:1)sympatric predators(gray wolves and tigers),and non-threatening sympatric species(golden pheasant,golden snub-nosed monkey,takin,and red panda),2)conspecifics with atypical fur colora-tion(albino and brown),and 3)zookeepers/non-zookeepers wearing either work uniform or plain *** each session,we tracked the pan-da's pupil movements and measured pupil first fixation point(FFP),fixation latency,total fixation count(TFC),and duration(TFD)of attention to each ***,pandas exhibited similar attention(FFPs and TFCs)to images of predators and non-threatening sympatric *** of golden pheasant,snub-nosed monkey,and tiger received less attention(TFD)than images of conspecifics,whereas images of takin and red panda received more attention,suggesting a greater alertness to habitat or food competitors than to potential ***'TFCs were greater for images of black-white conspecifics than for albino or brown phenotypes,implying that familiar color elicited more *** reacted differently to images of men versus *** images of women only,pandas gave more attention(TFC)to familiar combinations(uniformed zookeepers and plain-clothed non-zookeepers),consistent with the familiarity *** pandas can use visual perception to discriminate intra-specifically and inter-specifically,including details of human appearance,has applications for panda conservation and captive husbandry.

关键词： eye movement tracker giant panda images total fixation duration total pupil fixation count visual discrimination.

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Future impacts of climate change on forest fire danger in northeastern China

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Journal of forestry Research 2011年第3期22卷 437-446页

作者： TIAN Xiao-rui sHU Li-fu ZHAO Feng-jun WANG Ming-yu Douglas J. McRae state forestry administration＇s key open laboratory of forest protec- tion Research Institute of forest Ecology Environment and Protection Chinese Academy of Forestry Beijing 100091. Natural Resources Canada Canadian Forest Service 1219 Queen St. E.Sault Ste. Marie Ontario P6A 2E5.

Climate warming has a rapid and far-reaching impact on forest fire management in the boreal forests of China. Regional climate model outputs and the Canadian forest Fire Weather Index （FWI） sys- tem were used to analyze changes to fire danger and the fire season for future periods under IPCC special Report on Emission scenarios （sREs） A2 and B2, and the data will guide future fire management planning. We used regional climate in China （1961 1990） as our validation data, and the period （1991–2100） was modeled under sREs A2 and B2 through the weather simulated by the regional climate model system （PRECIs）. Meteorological data and fire danger were interpolated to 1 km 2 by using ANUsPLIN software. The average FWI value for future spring fire sea- sons under scenarios A2 and B2 shows an increase over most of the region. Compared with the baseline, FWI averages of spring fire season will increase by 0.40, 0.26 and 1.32 under scenario A2, and increase by 0.60, 1.54 and 2.56 under scenario B2 in 2020s, 2050s and 2080s, respectively. FWI averages of autumn fire season also show an increase over most of the region. FWI values increase more for scenario B2 than for scenario A2 in the same periods, particularly during the 2050s and 2080s. Average future FWI values will increase under both scenarios for autumn fire season. The potential burned areas are expected to increase by 10% and 18% in spring for 2080s under scenario A2 and B2, respectively. Fire season will be prolonged by 21 and 26 days under scenariosA2 and B2 in 2080s respectively.

关键词： climate change fire season forest fire danger northeastern China

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soil carbon budget in different-aged Chinese fir plantations in south China

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Journal of forestry Research 2014年第3期25卷 621-626页

作者： shebao Yu Dan Wang Wei Dai Ping Li College of forestry Beijing Forestry University Jiangxi Agricultural University key laboratory of forest Ecological Environment Research Institute of Forest Ecology Environment and Protection Chinese Academy of Forestry State Forestry Administration Beijing soil and Fertilizer Extension service station

Understanding the age effect on soil carbon balance in forest ecosystems is important for other material cycles and forest man-agement. In this research we investigated soil organic carbon density, litter production, litter decomposition rate, soil respiration, and soil mi-crobial properties in a chronosequence of four Chinese fir plantations of 7, 16, 23 and 29 years at Dagangshan mountain range, Jiangxi Province, south China. There was a significant increasing trend in litter production with increasing plantation age. Litter decomposition rate and soil respira-tion, however, declined from the 7-year to the 16-year plantation, and then increased after 16 years. This was largely dependent on soil micro-organisms. soil carbon output was higher than carbon input before 16 years, and total soil carbon stock declined from 35.98 t＆#183;ha-1 in the 7-year plantation to 30.12 t＆#183;ha-1 in the 16-year plantation. Greater litter produc-tion could not explain the greater soil carbon stock, suggesting that forest growth impacted this microbial process that controlled rates of soil car-bon balance together with litter and soil respiration. The results highlight＆amp;nbsp;the importance of the development stage in assessing soil carbon budget and its significance to future management of Chinese fir plantations.

关键词： Chinese fir soil microbial properties litter production litter decomposition rate soil respiration soil carbon stock

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Advances and challenges of cellulose functional materials in sensors

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Journal of Bioresources and Bioproducts 2023年第1期8卷 15-32页

作者： Hongwei Ma Zhiyong Cheng Xiaobai Li Bin Li Yujie Fu Jianchun Jiang key laboratory of forest Plant Ecology Ministry of EducationEngineering Research Center of Forest Bio-PreparationCollege of ChemistryChemical Engineering and Resource UtilizationNortheast Forestry UniversityHarbin 150040China state Engineering laboratory of Bio-Resource Eco-Utilization Northeast Forestry UniversityHarbin 150040China Collaborative Innovation Center for Development and Utilization of forest Resources Harbin 150040China The College of forestry Beijing Forestry UniversityBeijing 100083China Institute of Chemical Industry of forest Products Chinese Academy of ForestryNational Engineering Laboratory for Biomass Chemical UtilizationKey and Open Laboratory of Forest Chemical Engineering of State Administration of Forestry and GrasslandKey Laboratory of Biomass Energy and MaterialNanjing 210042China

As the most abundant natural polymer material on the earth,cellulose is a promising sustainable sensing material due to its high mechanical strength,excellent biocompatibility,good degrada-tion,and regeneration *** the inherent advantages of cellulose and the success of modern sensors,applying cellulose to sensors has always been the subject of considerable investigation,and significant progress has been made in recent ***,we reviewed the research progress of cellulose functional materials(CFMs)in recent *** to the different sources of cellulose,the classification and preparation methods for the design and func-tionalization of cellulose were summarized with the emphasis on the relationship between their structure and ***,the applications of advanced sensors based on CFMs in recent years were also ***,the potential challenges and prospects of the development of sensor based on CFMs were outlined.

关键词： Cellulose functional materials strain sensor humidity sensor chemical sensor

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Nitrogen retranslocation, allocation, and utilization in bare root Larix olgensis seedlings

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Journal of forestry Research 2012年第1期23卷 87-94页

作者： WEI Hong.xu·XU Cheng-yang · MA Lii-yi · DUAN Jie key laboratory of silviculture and Conservation Ministry of Educa-tion Beijing Forestry University Beijing 100083 China.

We quantified biomass accumulation and nitrogen （N） re- translocation, allocation, and utilization of Changbai larch （Larix olgen- sis） seedlings subjected to four fertilization treatments （24, 59, 81, 117 ***-1 N） with an unfertilized control during summer and autumn 2009. Ammonium phosphate （18-46-0） was the fertilizer used in all treatments. On both sampling dates, the needles had greater biomass and N content than new （2009） stems and old （2008） stems, and coarse, medium and fine roots （diameters of 〉5, 2-5 mm, and 0-2 mm, respectively）. Higher N concentration was observed in old stems and coarse roots than that in new stems and medium roots. In mid-summer, fine roots had higher N concentration than coarse roots. The treatment with 24 ***1 N had the greatest biomass and N content in needles and old stems, and highest net N retranslocation （NRA） and amount of N derived from soil. On sep- tember 21, no N translocation was observed, while the treatment with 24 ***^-1 N had the highest N utilization efficiency and fertilizer efficiency. Vector analysis revealed that all four fertilization treatments induced Nexcess relative to the control. The treatments with 59, 81, 117 ***^-1 N induce N excess compared with treatments at 24 ***-1 N. We conclude that the traditional local fertilizer application rates exceeded N require- ments and N uptake ability for Changbai larch seedlings. The application rate of 24 ***^-1 N is recommended.

关键词： Larix olgensis Nitrogen retranslocation allocation bio-mass Vector analysis

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Variations in leaf litter decomposition across contrasting forest stands and controlling factors at local scale

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Journal of Plant Ecology 2015年第3期8卷 261-272页

作者： Juan Wang Yeming You Zuoxin Tang shirong Liu Osbert Jianxin sun College of forest science Beijing Forestry University35 Qinghua East RoadHaidianBeijing 100083China Institute of forestry and Climate Change Research Beijing Forestry University35 Qinghua East RoadHaidianBeijing 100083China state forestry administration of China key laboratory of forest Ecology and Environment Institute of Forest EcologyEnvironment and ProtectionChinese Academy of ForestryBeijing 100091China

Aims litter decomposition is a critical pathway linking the above-and belowground ***,factors underlying the local spatial variations in forest litter decomposition are still not fully *** investigated leaf litter decomposition across con-trasting forest stands in central China,with objective to determine the spatial variations and controlling factors in forest floor leaf lit-ter decomposition in relation to changes in forest stands in a tem-perate forest *** leaf litter decomposition was studied by using litterbag method across several typical forest stand types in baotianman Nature reserve,central China,including pure stands of Quercus aliena ***,*** *** and ***-abilis,respectively,and mixed pine/oak stands dominated by Pinus armandii and *** ***,as well as stands of pure *** *** trees ranging in stand age from~40 to>160 *** were made on litter mass remaining and changes in litter chemistry during decomposition over a 2-year period,along with data collections on selective biotic and environmental factors.a reciprocal transplant experiment involv-ing *** *** and *** was concurrently carried out to test the occurrence of‘home-field advantage(HFa)’in local forests when only considering contrasting oak tree *** analyses and path analyses were performed to identify the dominant drivers and their relative contributions to variations in leaf litter *** findingssignificant variations were found in the rate of leaf litter decomposi-tion among stands of different tree species but not among stand age *** values of decay constant,k,varied from 0.62 in *** *** stands to 0.56 in *** *** reciprocal litter transplant experiment showed that the rate of leaf litter decom-position was on average 5%slower in home-fields than on recipro-cal *** a

关键词： litter decomposition N retention oak forest path analysis reciprocal litter transplant

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forest biomass carbon storage from multiple inventories over the past 30 years in Gansu Province, China: implications from the age structure of major forest types

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Journal of forestry Research 2015年第4期26卷 887-896页

作者： Jinhong Guan Huanshui Zhou Lei Deng Jianguo Zhang sheng Du state key laboratory of soil Erosion and Dryland Farming on Loess Plateau Institute of Soil and Water ConservationChinese Academy of Sciences and Ministry of Water Resources University of Chinese Academy of sciences Northwest Institute of forest Inventory Planning and DesignState Forestry Administration College of forestry Northwest A&F University Institute of soil and Water Conservation Northwest A&F University

We used the forest inventory data of Gansu Province, China to quantify carbon storage and carbon density changes by regional forest cover and by typical forest types in 1979-2006. Total forest area increased from 1.77 x 106 ha in 1979 to 2.32 x 106 ha in 2006, and the forest carbon storage, estimated by the continuous biomass expansion factor method, increased from 83.14 to 100.66 Tg, equivalent to a carbon accumulation rate of 0.0071 Tg per year during the period. Mean carbon densities were 44.83-48.50 t ha-1 and the values decreased slightly over the time period. Natural forests generated greater car- bon storage and density than did plantations. By regression analysis, forest stand age was an important parameter incarbon density studies. We developed various regression equations between carbon density and stand age for major types of natural forests and plantations in the region. Our results can be used for proper selection of re-forestation species and efficient management of young and middle-aged forests, offering great potential for future carbon sequestra- tion, especially in arid and semi-arid regions.

关键词： Age class Carbon density forest carbonstorage forest inventory data Gansu Province Reforestation

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Effect of reforestation on annual water yield in a large watershed in northeast China

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Journal of forestry Research 2015年第3期26卷 697-702页

作者： Yuefeng Yao Tijiu Cai Cunyong Ju Chengxin He Guangxi key laboratory of Plant Conservation and Restoration Ecology in Karst Terrain Guangxi Institute of Botany school of forestry Northeast Forestry University

A simplified water balance model in conjunc- tion with an evapotranspiration （ET） model and cumulative forest cover data were used to quantify the changes in annual water yield in response to reforestation in a large watershed, northeast China. Cumulative forest cover increased by 22 %, leading to a significant decrease in estimated annual water yield. Reforestation increased ET （P = 0.0144）, resulting in a remarkable decrease （P = 0.0001） in estimated annual water yield according to the water balance model. Reforestation increased ET by 33 mm and decreased annual water yield by 38 mm per decade. The effect of reforestation on annual water yield can be quantified using a simplified water balance model in a large watershed, although our reforestation area was small （about 20 %） in relation to the total watershed area.

关键词： Annual water yield Cumulative forestcover Evapotranspiration (ET) Reforestation Water balance model

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status and distribution changes of the endangered Green Peafowl (Pavo muticus) in China over the past three decades (1990s-2017)

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Avian Research 2018年第2期9卷 102-110页

作者： Dejun Kong Fei Wu Pengfei shan Jianyun Gao Dao Yan Weixiong Luo Xiaojun Yang key laboratory of special Biological Resource Development and Utilization of Universities in Yunnan Province Kunming University Kunming 650214 China Bird Group Kunming Institute of Zoology Chinese Academy of Sciences Kunming 650223 China Kunming survey and Design Institute of state forestry administration Kunming 650216 China

Background： Understanding the changes in population dynamics, including demographics, distribution and threats is essential for species status *** endangered Green Peafowl （Povo muticus） has experienced sharp population declines and d stribution range diminishing both in China and southeast Asia. Field population surveys have not been conducted in China since the 1990s, which hindered conservation planning and ***： With interview and line transects methods, we figured out the population and distribution changes of Green Peafowl across its historical ranges over the past three decades in China during ***： The Green Peafowl once habituated in 54 counties in China. Nearly 60% of the distribution counties were lost in the past three decades, with the left 22 counties distributed in central, southern and western Yunnan, sW China. Population decrease detected in all distribution areas except for shuangbai and Xinping county where more than 60% of the total population is located. Only about 30% of the former bird population were recorded with the same interviewing method as 20 years *** birds, 1 carcass, 6 calls and 12 footprints were detected along the 865 km line transects, indicating extremely low encounter rate of Green Peafowl in field. sharp decreases in flock sizes were also detected, from 8-20 birds per flock in the 1990s to 3-5 birds at present. Poaching and habitat conversion are two widespread and long-lasting threats, while poison tion affect regional population＇s survival. Large flocks of 18 ng caused mortality in the past and hydropower construc -27 birds were discovered in the field, which increases our confidence of population recovery of this endangered pheasant in ***： Only interviewed bird number and counts based on line transects were presented in this study, without further population estimation due to limitation of the data sets. Although the actual population of this cryptic bird must be

关键词： Green Peafowl Population decline Range concentration Endangered species southwestern China

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