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Driving mechanisms of gross primary productivity geographical patterns for Qinghai-Tibet Plateau lake systems

SCIENCE OF THE TOTAL ENVIRONMENT 2021年 791卷 148286-148286页

作者： Jia, Junjie Wang, Yafeng Lu, Yao Sun, Kun Lyu, Sidan Gao, Yang 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 Chinese Acad Sci Inst Tibetan Plateau Res Key Lab Alpine Ecol Beijing 100101 Peoples R China

Being a fundamental property of aquatic systems, gross primary productivity (GPP) is affected by complex environmental factors, such as salinity, nutrients, pH, and sunlight. Under conditions of intensified anthropogenic activity and climate change, it is critical to understand the driving mechanisms of GPP in alpine lakes. In this study, we investigated GPP and associated environmental factors of 23 lake systems in the Qinghai-Tibet Plateau (QTP) along an altitudinal range (from 2500 m to 4500 m). Results showed an increase in chlorophyll a (Chl a) content as altitude increased and a corresponding decrease as salinity increased. Furthermore, geographical patterns of GPP were higher at the mid-gradient and lower at the extreme gradient. Higher solar radiation and water temperatures, stronger evaporation and higher salinity levels, and lower pH and higher nutrient content were all driving mechanisms of GPP in low altitudinal lake systems within high latitudinal regions. Such conditions have collectively resulted in the current GPP pattern via the promotion or inhibition of phytoplankton growth and photosynthesis. Specifically, geographical features and climate change jointly drive algal growth and GPP of alpine lake systems via internal circulation processes;however, anthropogenic activities interfere with external circulation processes for most of lower-middle altitudinal lake systems, thus playing a certain role in regulating environmental factors and GPP alongside climate change. (c) 2021 Elsevier B.V. All rights reserved.

关键词： Gross primary productivity (GPP) Alpine lakes Altitude Salinity Climatic change Qinghai-Tibet Plateau (QTP)

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大规模人工造林是否会加剧中国北方土壤水分亏缺?

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Science Bulletin 2024年第10期69卷 1506-1514页

作者：王秋铭刘鸿雁梁博毅石亮伍露曹静 College of Urban and Environmental Sciences and PKU Saihanba StationPeking UniversityBeijing 100871China College of Forestry Precision Forestry Key Laboratory of BejingBejing Forestry UniversityBeijing 10083China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China China Meteorological Administration Training Center Beijing 100081China State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Regional Eco-process and Function AssessmentChinese Research Academy of Environmental SciencesBeijing 100012China

Trading water for carbon has cautioned large-scale afforestation in global ***,model simulations suggested that the consumption of soil water could be partially offset by increasing precipitation due to vegetation feedback.A systematic meta-analysis of long-term and large-scale field observations is urgently required to address the abovementioned limitations,and the implementation of large-scale afforestation since 1978 in northern China provides an ideal *** study collected data comprising 1226 observations from 98 sites in northern China to assess the variation in soil water content(SWC)with stand age after afforestation and discuss the effects of tree species,precipitation and conversions of land use types on *** found that the SWC has been decreased by coniferous forest and broadleaf forest at rates of 0.6 and 3.2 mm decade-1,respectively,since *** is a significant declining trend of SWC with the stand age of plantations,and the optimum growth stage for plantation forest is 0-20 a in northern ***,we found increases in SWC for the conversion from grassland to forest and in the low-precipitation region,both are corresponding to the increased SWC in coniferous *** study implies that afforestation might lead to a soil water deficit crisis in northern China in the long term at the regional scale but depends on prior land use types,tree taxa and the mean annual precipitation regime,which sheds light on decision-making regarding ecological restoration policies and water resource management in drylands.

关键词： Soil water Afforestation Tree planting Land use changes Arid and semiarid area

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青藏高原东北部湖泊浮游植物对气候振荡的响应:来自1400年沉积物岩芯的证据

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Science Bulletin 2024年第9期69卷 1208-1211页

作者：张含笑郑佳楠王荣刘永高扬吴丰昌霍守亮 State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Geography and Ocean Science Nanjing UniversityNanjing 210023China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Key Laboratory of Water and Sediment Science Ministry of EducationCollege of Environmental Science and EngineeringPeking UniversityBeijing 100871China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

The Tibetan Plateau, also known as the Water Tower of Asia, is home to 1424 lakes with areas of greater than 1 km2, and supplies freshwater resources for more than 1.4 billion people [1,2]. In the context of recent global change, the warmer climate has caused prominent changes in the characteristics of the lake evolution on the Tibetan Plateau, such as changes in the hydrology.

关键词： Tibetan Plateau 青藏高原东北部

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A Study of the Qianyanzhou Mode in a Subtropical Red Soil Hilly Region of China

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Journal of Resources and Ecology 2018年第6期9卷 653-662页

作者： ZOU Jingdong LIU Wenjing WANG Jingsheng WANG Tong LI Chao DING Lubin BAO Xiaoting Ji'an Institute of Agricultural Sciences Ji'anJiangxi 343103China School of Environment and Natural Resources Renmin University of China Beijing 100872China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Qianyanzhou is located in the heart of Jitai Basin in Guanxi town,the county seat of Taihe county in Jiangxi *** has a subtropical humid climate and exemplifies the geographic and geomorphologic characteristics of red soil hilly regions in southern *** the early 1980s,to control soil and water loss and problems with grain yields,Qianyanzhou's researchers proposed an innovative,comprehensive stereoscopic ag- riculture development mode known as the 'Qianyanzhou mode'.This mode included a forest-livestock-food ecosystem,a forest-fruit-economy ecosystem,and a land-water compound stereoscopic system,all located within a *** the Qianyanzhou mode,soil and water loss were completely controlled,thereby promoting environmental conservation and economic *** state and the society as a whole supported this mode thanks to its far-reaching social *** the 21st century,given new societal concerns and continuing economic development,Qianyanzhou mode has been restructured as two ecosystems of forest-fowl and planting-raising circular economies at landscape level,based on an increase in vegetation coverage from 4.3% to more than 80%.These improved modes can significantly enhance the ecosystem,reduce poverty,and to promote the construction of local ecological *** study introduces the Qianyanzhou mode and summarizes its characteristics in different *** hope that the information in this study supports improvements to and promotion of the Qianyanzhou *** believe the Qianyanzhou mode can play an important role in efforts to modify the agriculture industrial structure,alleviate poverty,and construct ecological civilization.

关键词： Qianyanzhou mode red soil hilly region compound management

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Changes in Soil Nutrient Stoichiometric Ratios Reveal Increasing Phosphorus Limitation Along a Tropical Soil Chronosequence

SSRN

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SSRN 2022年

作者： Zhao, Wen Huang, Lai-Ming Yellow River Delta Modern Agricultural Engineering Laboratory Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China College of Resources and Environment University of Chinese Academy of Sciences Beijing100049 China Key Laboratory of Ecosystem Network Observation and Modeling China

Understanding the variations and controls of stoichiometric ratios of soil nutrients during different stages of soil evolution can provide guidance for ecosystem nutrient management and regulation. This study investigated the changes in and factors associated with soil nutrient stoichiometric ratios during different stages of soil development using a well-established soil chronosequence (0.09, 0.146, 0.64, 1.12, 1.81, and 2.30 million years) developed on basalt in southern China. Results showed that available nitrogen (AN) decreased continuously with increasing soil age. Total nitrogen (TN), total phosphorus (TP), available phosphorus (AP), and soil organic carbon (SOC) increased initially during the early stage of soil development, reaching peak values in the 0.146 million-year-old soil profiles. Thereafter, TP and AP fluctuated with increasing soil age, whereas SOC exhibited a decreasing trend with aging soil. The profile-averaged C:N (9.82–12.75), C:P (0.86–1.98), and N:P (0.86–1.98) remained relatively stable across the soil chronosequence (the coefficient of variation (CV) 0.64 million years) developed on basalt to alleviate the increasing P limitation in the late stage of soil evolution. © 2022, The Authors. All rights reserved.

关键词： Soils

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New Framework for Evaluating ecosystem Quality in Nature Reserves based on Ideal References and key Indicators

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Journal of Resources and Ecology 2022年第3期13卷 466-475页

作者： WU Zhenliang HOU Jihua XU Li HE Nianpeng School of Ecology and Nature Conservation Beijing Forestry UniversityBeijing 100083China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Vegetation Ecology of Ministry of Education Northeast Normal UniversityChangchun 130024China

With increasing numbers and types of nature reserves(NRs),objective evaluation and comparison of the effects of different nature NRs on conservation efforts are of great importance for protecting species diversity,ensuring reasonable national economic input,and adjusting government management *** a method for the combined assessment of flagship or umbrella species and ecosystem quality will improve the evaluation of ***,it is also important to establish a new framework for rapid evaluation of ecosystem quality,supported by the advantages of scientific,economic,and regular ***,we proposed a new framework that incorporates the novel concept of ideal references into evaluation systems,which will facilitate the comparison of results from different periods and ***,from the perspective of making the framework as objective,rapid,and economical as possible,we recommended some key ecological indicators,such as net primary productivity,soil organic matter,plant diversity,for use in the new evaluation *** new framework,referred to as“ideal reference and key indicators”(IRKI),can sufficiently meet the requirements for the rapid evaluation of ecosystem quality both regionally and ***,IRKI can identify the restoration potential and restoration periods of NRs,thus facilitating the rational distribution of resources and enhancing the protective *** are many types of NRs in China,and it is necessary to partially alter the assessment methods or parameters for different types of ***,IRKI provides a simple,clear,and comparable framework that will strongly enhance the conservation of protected areas(PAs)and facilitate the standardization of management practices.

关键词： nature reserve ecosystem quality ideal reference key indicators conservation management

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Considerations of Forest Distribution and Native Tree Species for Afforestation in the High Altitudes on the Eastern Tibetan Plateau

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Journal of Resources and Ecology 2022年第1期13卷 100-106页

作者： SHI Peili ZHENG Lili ZHOU Tiancai HOU Ge ZHAO Guangshuai Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences andNatural Resources ResearchChinese Academy of SciencesBeijing 100101China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100190China School of Life Science Taizhou UniversityTaizhouZhejiang 318000China China National Forestry-Grassland Economics and Development Research Center National Forestry and Grassland AdministrationBeijing 100714China

Forests are the main components of terrestrial ecosystems and play an important role in the protection and construction of the national ecological security barrier. For a long time, China’s large-scale afforestation had been practiced in areas with rainfall higher than the 400 mm threshold, but the issue of afforestation in high altitudes on the Tibetan Plateau remains elusive in both practical experience and theoretical exploration. It is worth thinking further about what principles should be followed in the selection of tree species and suitable altitudes for afforestation in high-altitude areas, as well as what experiences and lessons of previous afforestation efforts should be applied in high-altitude areas. As per the law of vegetation zonal distribution, this paper argues that afforestation at high altitudes should comply with the principle of vegetation zonal distribution and the low temperature limitation,and points out that afforestation is feasible only within the forest distribution area and below the altitudes of climate timberlines. Furthermore, we demonstrate the potential spatial areas of afforestation, and determine the local tree species that may be used for afforestation based on the existing problems of afforestation in eastern Tibet. In summary, afforestation in high-altitude areas of the eastern Tibetan Plateau must comply with the law of zonal vegetation distribution, focus on the upper limit of altitude and the selection of suitable tree species, and adopt only suitable native tree species.

关键词： eastern Tibetan Plateau natural forest distribution climatic treeline low-temperature limitation afforestation upper limit afforestation species selection

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Response of Plant Community Carbon and Nitrogen Stoichiometry to Experimental Warming on the Qinghai-Tibet Plateau

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Journal of Resources and Ecology 2020年第3期11卷 315-321页

作者： ZHANG Haorui QIN Jiwei FU Gang Lhasa Plateau Ecosystem Research Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China Agriculture and Animal Husbandry of Tibet Autonomous Region Academy of Sciences Institute of Agricultural Resource and EnvironmentLhasa 850002China University of Chinese Academy of Sciences Beijing 100049China

Low temperature is an important limiting factor for alpine ecosystems on the Tibetan Plateau. This study is based on data from on-site experimental warming platforms(open top chambers, OTC) at three elevations(4300 m, 4500 m, 4700 m) on the Qinghai-Tibet Plateau. The carbon and nitrogen stoichiometry characteristics of plant communities, both above-ground and below-ground, were observed in three alpine meadow ecosystems in August and September of 2011 and August of 2012. Experimental warming significantly increased above-ground nitrogen content by 21.4% in September 2011 at 4500 m, and reduced above-ground carbon content by 3.9% in August 2012 at 4300 m. Experimental warming significantly increased below-ground carbon content by 5.5% in August 2011 at 4500 m, and the below-ground ratio of carbon to nitrogen by 28.0% in September 2011 at 4300 m, but reduced below-ground nitrogen content by 15.7% in September 2011 at 4700 m, below-ground carbon content by 34.3% in August 2012 at 4700 m, and the below-ground ratio of carbon to nitrogen by 37.9% in August 2012 at 4700 m. Experimental warming had no significant effect on the characteristics of community carbon and nitrogen stoichiometry under other conditions. Therefore, experimental warming had inconsistent effects on the carbon and nitrogen stoichiometry of plant communities at different elevations and during different months. Soil ammonium nitrogen and nitrate nitrogen content were the main factors affecting plant community carbon and nitrogen stoichiometry.

关键词： Damxung County alpine meadow open top chambers carbon and nitrogen stoichiometry

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Nitrogen Isotopic Heterogeneity Underlying Seasonal Rhythms of Phytoplankton Community Structure in a Large Subtropical Lacustrine ecosystem

SSRN

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SSRN 2024年

作者： Wu, Fan Ha, Xianrui Lin, Shunhe Gao, Yang Jia, Junjie Wang, Jing Sun, Kun Lu, Yao Wang, Shuoyue Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing100101 China University of Chinese Academy of Sciences Beijing100049 China Department of Obstetrics and Gynecology Fujian Maternity and Child Health Hospital Fujian350102 China

Inorganic forms of nitrogen (N) are one of the key mediating factors on phytoplankton growth and dynamic. However, changes in phytoplankton community structure caused by phytoplankton’s preference for inorganic N utilize remain poorly understood. This study used nitrate nitrogen (δ15N-NO3⁻) and oxygen (δ18O-NO3⁻) isotopes to investigate differences in seasonal N cycling as well as associated phytoplankton biomass and community composition response. Results showed that the average δ15N-NO3⁻ values in spring, summer, autumn, and winter were 7.62‰, 6.11‰, 5.48‰, and 7.41‰, respectively. Accordingly, the average δ18O-NO3⁻ values showed the following order: winter (12.84‰) > summer (11.49‰) > spring (10.32‰) > autumn (7.88‰). The main nitrate sources in Lake Poyang were soil N, manure, sewage, and the ammonium (NH4+) within fertilizer and rainwater in all seasons. Nitrification and algal-derived nitrate assimilation were the main biochemical processes affecting nitrate, where the former was stronger in spring and the latter was stronger in autumn. In summer, Cyanophyta was the most dominant phytoplankton phylum, while Bacillariophyta was enriched in the other three seasons. The total biomass of phytoplankton in winter was the lowest of all four seasons and it was negatively correlated with NO3⁻-N concentration. The results of this study revealed the seasonal variation of N forms and the potential source of N in a large subtropical lacustrine ecosystem, providing a new perspective on the role of phytoplankton in the lake N cycle. © 2024, The Authors. All rights reserved.

关键词： Lakes

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Unimodal productivity-biodiversity relationship along the gradient of multidimensional resources across Chinese grasslands

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National Science Review 2022年第12期9卷 90-103页

作者： Yanfen Wang Jianqing Du Zhe Pang Yali Liu Kai Xue Yann Hautier Biao Zhang Li Tang Lili Jiang Baoming Ji Xingliang Xu Jing Zhang Ronghai Hu Shutong Zhou Fang Wang Rongxiao Che Di Wang Chaoting Zhou Xiaoyong Cui Nico Eisenhauer Yanbin Hao College of Resources and Environment University of Chinese Academy of Sciences State Key Laboratory of Tibetan Plateau Earth System Environment and Resources Chinese Academy of Sciences Beijing Yanshan Earth Critical Zone National Research Station University of Chinese Academy of Sciences School of Grassland Science Beijing Forestry University Ecology and Biodiversity Group Department of BiologyUtrecht University Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences College of Life Sciences University of Chinese Academy of Sciences School of Ecology and Environmental Sciences Yunnan University Institute of Biophysics Chinese Academy of Sciences Department of Medicine New York University Grossman School of Medicine Beijing Yanshan Earth Critical Zone National Research Station University of Chinese Academy of Sciences College of Life Sciences University of Chinese Academy of Sciences German Centre for Integrative Biodiversity Research (iDiv) Institute of Biology Leipzig University

Resources can affect plant productivity and biodiversity simultaneously and thus are key drivers of their relationships in addition to plant-plant ***,most previous studies only focused on a single resource while negle cting the nature of resource *** we integrated four essential resources for plant growth into a single metric of resource diversity(RD) to investigate its effects on the productivity-biodiversity relationship(PBR) across Chinese *** showed that habitats differing in RD have different PBRs—positive in low-resource habitats,but neutral in medium-and high-resource ones—while collectively,a weak positive PBR was observe ***,when excluding direct effects of RD on productivity and biodiversity,the PBR in high-resource habitats became negative,which leads to a unimodal instead of a positive PBR along the RD *** integrating resource effects and changing plant-plant interactions into a unified framework with the RD gradient,our work contributes to uncovering underlying me chanisms for inconsistent PBRs at large scales.

关键词： productivity–biodiversity relationship resource diversity plant strategies grassland

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