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Search Results: 1 - 10 of 18316 matches for " JingYun Fang "
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Measurement of respiration amount of white birch(Betula platyphylla) population in the mountainousregion of Beijing
Fang Jingyun,Wang Xiaoke,
Fang Jingyun
,Wang Xiaoke

环境科学学报(英文版) , 1995,
Abstract: Measurement of forest community respiration is very important for clarifying the processes of mat-ter cycle in forest ecosystem. Measurement of respiration of white birch (Betula platyphylla) population inthe mountainous region of Beijing was reported herein and its results showed that the diameter frequency dis-tribution of the woody orgaris was fitted by a power equation and the respiration rates of the organs decreasedwith their increasing diameter. These formulae to calculate the total respiration amount of every organ for anindividual were introduced and those corresponding parameters were given. The quantitative relationship toestimate population respiration amount from three size was proposed. Using the ahave relationships, the an-nual respiration amount of white birch population was estimated to be 10. 8t CO_2/ha/a , of which stem , root ,branch and leaf were 1. 4 , 2. 0 , 2. 8 and 4. 7 tCO_2/ha/a, respectively.
Issues and prospects of belowground ecology with special reference to global climate change
Jinsheng He,Zhengquan Wang,Jingyun Fang
Chinese Science Bulletin , 2004, DOI: 10.1007/BF03184277
Abstract: The theory of ecology is based on over 100 a of research and investigation, all centered on aboveground patterns and processes. However, as contemporary ecologists are increasingly acknowledging, belowground structures, functions, and processes are some of the most poorly understood areas in ecology. This lack of understanding of belowground ecological processes seriously restricts the advance of global change research. The interdisciplinary field of belowground ecology began to flourish in the 1990s, along with the expansion of global change research, and quickly gained momentum. Belowground ecology aims to investigate belowground structures, functions, and processes, as well as their relationships with corresponding aboveground features, emphasizing the responses of belowground systems under global change conditions. Key research areas include root ecology, belowground animals, and soil microorganisms. This review summarizes and analyzes the relationships between above- and belowground ecosystems, root ecology, root biogeography, belowground biodiversity, as well as research areas with particular challenges and progress. This commentary emphasizes certain theoretical issues concerning the responses of belowground processes to global change, and concludes that belowground ecology is a critical research priority in the 21st century.
Why are East Asian ecosystems important for carbon cycle research?
JingYun Fang,YanHong Tang,Yowhan Son
Science China Life Sciences , 2010, DOI: 10.1007/s11427-010-4032-2
Distribution of persistent organochlorine pesticides in samples from the Canadian Arctic
Fengchun An,Kewu Yang,Hanhong Mo,Jingyun Fang
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02883071

Fang Jingyun,

生态学报 , 1995,
Abstract: espiration amount of Quercus liaotutungensis, a dominant species in Q. liaotungensis com-munity located in Beijing,was studied in the present paper. The method and technigue ofmeasuring the respiration rate of organs of trees by using a CO_2 gas analyzer were noted insome details,and two basic formulae for woody organs,diameter frequency distribution func-tion and the relation of the respiration rate to its diameter, were given. Baded on these twoformulae, the authors built an equation for the calculation ...

Fang Jingyun,

生态学报 , 1994,
Abstract: ased on relationships between the warmth index and annual mean temperature and be-tween the moisture index and annual precipitation,a new method was developed to show thearrangement of East-Asian vegetation on the coordinates of annual mean temperature and an-nual precipitation by using a lot of climatological and vegetational data. The results showedthat the method expressed well the distribution of vegetation-climate types in East-Asia,andtherefore could be used to predict the natural or potential vegetation type in a given East-Asian region.
Soil carbon pool in China and its global significance
Fang Jingyun,Liu Guohua,Xu Songling,
Fang Jingyun
,Liu Guohu,Xu Songling

环境科学学报(英文版) , 1996,
Abstract: Soil organic carbon density and its related characteristics of 41 soil types all over China were analyzed by using data of 745 soil profiles , and size of soil carbon pool was estimated. As a result, area-weighted averages of these 41 soil types for bulk density, profile depth, organic carbon content and profile carbon were 1. 24 tC/m3, 86. 2 cm, 3. 04% and 19. 7 kg C/m2respectively. Total size of soil carbon pool was 185. 68 × 109tC, which is 29 times of that in terrestrial biomass of China and 12. 6% of global soil carbon pools. Because of its huge carbon pool, soil of China plays an important role in global carbon cycle.
Effectiveness of Protected Areas in Maintaining Plant Production
Zhiyao Tang,Jingyun Fang,Jinyu Sun,Kevin J. Gaston
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0019116
Abstract: Given the central importance of protected area systems in local, regional and global conservation strategies, it is vital that there is a good understanding of their effectiveness in maintaining ecological functioning. Here, we provide, to our knowledge, the first such global analysis, focusing on plant production, a “supporting” ecosystem function necessary for multiple other ecosystem services. We use data on the normalized difference vegetation index (NDVI) as a measure of variation in plant production in the core, boundary and surroundings of more than 1000 large protected areas over a 25 year period. Forested protected areas were higher (or similar), and those non-forested were lower (or similar), in NDVI than their surrounding areas, and these differences have been sustained. The differences from surrounding areas have increased for evergreen broadleaf forests and barren grounds, decreased for grasslands, and remained similar for deciduous forests, woodlands, and shrublands, reflecting different pressures on those surroundings. These results are consistent with protected areas being effective both in the representation and maintenance of plant production. However, widespread overall increases in NDVI during the study period suggest that plant production within the core of non-forested protected areas has become higher than it was in the surroundings of those areas in 1982, highlighting that whilst the distinctiveness of protected areas from their surroundings has persisted the nature of that difference has changed.
The Changes in China's Forests: An Analysis Using the Forest Identity
Lei Shi,Shuqing Zhao,Zhiyao Tang,Jingyun Fang
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0020778
Abstract: Changes in forest carbon stocks are a determinant of the regional carbon budget. In the past several decades, China has experienced a pronounced increase in forest area and density. However, few comprehensive analyses have been conducted. In this study, we employed the Forest Identity concept to evaluate the changing status of China's forests over the past three decades, using national forest inventory data of five periods (1977–1981, 1984–1988, 1989–1993, 1994–1998, and 1999–2003). The results showed that forest area and growing stock density increased by 0.51% and 0.44% annually over the past three decades, while the conversion ratio of forest biomass to growing stock declined by 0.10% annually. These developments resulted in a net annual increase of 0.85% in forest carbon sequestration, which is equivalent to a net biomass carbon uptake of 43.8 Tg per year (1 Tg = 1012 g). This increase can be attributed to the national reforestation/afforestation programs, environmentally enhanced forest growth and economic development as indicated by the average gross domestic product.
Ecosystem carbon stocks and their changes in China’s grasslands
JingYun Fang,YuanHe Yang,WenHong Ma,Anwar Mohammat,HaiHua Shen
Science China Life Sciences , 2010, DOI: 10.1007/s11427-010-4029-x
Abstract: The knowledge of carbon (C) stock and its dynamics is crucial for understanding the role of grassland ecosystems in China’s terrestrial C cycle. To date, a comprehensive assessment on C balance in China’s grasslands is still lacking. By reviewing published literature, this study aims to evaluate ecosystem C stocks (both vegetation biomass and soil organic C) and their changes in China’s grasslands. Our results are summarized as follows: (1) biomass C density (C stock per area) of China’s grasslands differed greatly among previous studies, ranging from 215.8 to 348.1 g C m 2 with an average of 300.2 g C m 2. Likewise, soil C density also varied greatly between 8.5 and 15.1 kg C m 2. In total, ecosystem C stock in China’s grasslands was estimated at 29.1 Pg C. (2) Both the magnitude and direction of ecosystem C changes in China’s grasslands differed greatly among previous studies. According to recent reports, neither biomass nor soil C stock in China’s grasslands showed a significant change during the past 20 years, indicating that grassland ecosystems are C neutral. (3) Spatial patterns and temporal dynamics of grassland biomass were closely correlated with precipitation, while changes in soil C stocks exhibited close associations with soil moisture and soil texture. Human activities, such as livestock grazing and fencing could also affect ecosystem C dynamics in China’s grasslands.
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