Now showing items 1-15 of 15

  • Beyond leaf color : comparing camera-based phenological metrics with leaf biochemical, biophysical, and spectral properties throughout the growing season of a temperate deciduous forest 

    Yang, Xi; Tang, Jianwu; Mustard, John F. (John Wiley & Sons, 2014-03-31)
    Plant phenology, a sensitive indicator of climate change, influences vegetation-atmosphere interactions by changing the carbon and water cycles from local to global scales. Camera-based phenological observations of the ...
  • Consequence of altered nitrogen cycles in the coupled human and ecological system under changing climate: the need for long-term and site-based research. 

    Shibata, Hideaki; Branquinho, Cristina; McDowell, William H.; Mitchell, Myron J.; Monteith, Don T.; Tang, Jianwu; Arvola, Lauri; Cruz, Cristina; Cusack, Daniela F.; Halada, Lubos; Kopacek, Jiri; Maguas, Cristina; Sajidu, Samson; Schubert, Hendrik; Tokuchi, Naoko; Zahora, Jaroslav (2014-07)
    Anthropogenically derived nitrogen (N) has a central role in global environmental changes, including climate change, biodiversity loss, air pollution, greenhouse gas emission, water pollution, as well as food production ...
  • Ecosystem fluxes of hydrogen : a comparison of flux-gradient methods 

    Meredith, Laura K.; Commane, R.; Munger, J. W.; Dunn, A.; Tang, Jianwu; Wofsy, Steven C.; Prinn, Ronald G. (Copernicus Publications on behalf of the European Geosciences Union, 2014-09-03)
    Our understanding of biosphere–atmosphere exchange has been considerably enhanced by eddy covariance measurements. However, there remain many trace gases, such as molecular hydrogen (H2), that lack suitable analytical ...
  • Enhancement of nitrate removal at the sediment-water interface by carbon addition plus vertical mixing 

    Chen, Xuechu; He, Shengbing; Zhang, Yueping; Huang, Xiaobo; Huang, Yingying; Chen, Danyue; Huang, Xiaochen; Tang, Jianwu (2014-12)
    Wetlands and ponds are frequently used to remove nitrate from effluents or runoffs. However, the efficiency of this approach is limited. Based on the assumption that introducing vertical mixing to water column plus carbon ...
  • Greening China naturally 

    Cao, Shixiong; Sun, Ge; Zhang, Zhiqiang; Chen, Liding; Feng, Qi; Fu, Bojie; McNulty, Steve; Shankman, David; Tang, Jianwu; Wang, Yanhui; Wei, Xiaohua (2011-04)
    China leads the world in afforestation, and is one of the few countries whose forested area is increasing. However, this massive ‘‘greening’’ effort has been less effective than expected; afforestation has sometimes produced ...
  • Heterotrophic respiration in disturbed forests : a review with examples from North America 

    Harmon, Mark E.; Bond-Lamberty, Ben; Tang, Jianwu; Vargas, Rodrigo (American Geophysical Union, 2011-05-14)
    Heterotrophic respiration (RH) is a major process releasing carbon to the atmosphere and is essential to understanding carbon dynamics in terrestrial ecosystems. Here we review what is known about this flux as related to ...
  • Impacts of rice varieties and management on yield-scaled greenhouse gas emissions from rice fields in China : a meta-analysis 

    Zheng, H.; Huang, H.; Yao, L.; Liu, J.; He, H.; Tang, Jianwu (Copernicus Publications on behalf of the European Geosciences Union, 2014-07-10)
    Increasing numbers of studies have suggested that a comprehensive assessment of the impacts of cropping practices on greenhouse gas (GHG) emissions per unit yield (yield-scaled), rather than by land area (area-scaled), is ...
  • Looking deeper into the soil : biophysical controls and seasonal lags of soil CO2 production and efflux 

    Vargas, Rodrigo; Baldocchi, Dennis D.; Allen, Michael F.; Bahn, Michael; Black, T. Andrew; Collins, Scott L.; Yuste, Jorge Curiel; Hirano, Takashi; Jassal, Rachhpal S.; Pumpanen, Jukka; Tang, Jianwu (Ecological Society of America, 2010-09)
    We seek to understand how biophysical factors such as soil temperature (Ts), soil moisture (θ), and gross primary production (GPP) influence CO2 fluxes across terrestrial ecosystems. Recent advancements in automated ...
  • Regional-scale phenology modeling based on meteorological records and remote sensing observations 

    Yang, Xi; Mustard, John F.; Tang, Jianwu; Hong, Xu (American Geophysical Union, 2012-09-14)
    Changes of vegetation phenology in response to climate change in the temperate forests have been well documented recently and have important implications on the regional and global carbon and water cycles. Predicting the ...
  • Root standing crop and chemistry after six years of soil warming in a temperate forest 

    Zhou, Yumei; Tang, Jianwu; Melillo, Jerry M.; Butler, Sarah M.; Mohan, Jacqueline E. (2010-02)
    Examining the responses of root standing crop (biomass and necromass) and chemistry to soil warming is crucial for understanding root dynamics and functioning in the face of global climate change. We assessed the standing ...
  • Simulating the impacts of disturbances on forest carbon cycling in North America : processes, data, models, and challenges 

    Liu, Shuguang; Bond-Lamberty, Ben; Hicke, Jeffrey A.; Vargas, Rodrigo; Zhao, Shuqing; Chen, Jing; Edburg, Steven L.; Hu, Yueming; Liu, Jinxun; McGuire, A. David; Xiao, Jingfeng; Keane, Robert; Yuan, Wenping; Tang, Jianwu; Luo, Yiqi; Potter, Christopher; Oeding, Jennifer (American Geophysical Union, 2011-11-08)
    Forest disturbances greatly alter the carbon cycle at various spatial and temporal scales. It is critical to understand disturbance regimes and their impacts to better quantify regional and global carbon dynamics. This ...
  • Soil carbon fluxes and stocks in a Great Lakes forest chronosequence 

    Tang, Jianwu; Bolstad, Paul V.; Martin, Jonathan G. (2008-07)
    We measured soil respiration and soil carbon stocks, as well as micrometeorological variables in a chronosequence of deciduous forests in Wisconsin and Michigan. The chronosequence consisted of (1) four recently disturbed ...
  • Soil CO2 efflux of a larch forest in northern Japan 

    Liang, N.; Hirano, Takashi; Zheng, Z.-M.; Tang, Jianwu; Fujinuma, Y. (Copernicus Publications on behalf of the European Geosciences Union, 2010-11-05)
    We had continuously measured soil CO2 efflux (Rs) in a larch forest in northern Japan at hourly intervals for the snow-free period in 2003 with an automated chamber system and partitioned Rs into heterotrophic respiration ...
  • Soil respiration at mean annual temperature predicts annual total across vegetation types and biomes 

    Bahn, Michael; Reichstein, M.; Davidson, Eric A.; Grunzweig, J.; Jung, M.; Carbone, M. S.; Epron, D.; Misson, L.; Nouvellon, Y.; Roupsard, O.; Savage, K.; Trumbore, Susan E.; Gimeno, C.; Curiel Yuste, J.; Tang, Jianwu; Vargas, Rodrigo; Janssens, Ivan A. (Copernicus Publications on behalf of the European Geosciences Union, 2010-07-09)
    Soil respiration (SR) constitutes the largest flux of CO2 from terrestrial ecosystems to the atmosphere. However, there still exist considerable uncertainties as to its actual magnitude, as well as its spatial and interannual ...
  • Steeper declines in forest photosynthesis than respiration explain age-driven decreases in forest growth 

    Tang, Jianwu; Luyssaert, Sebastiaan; Richardson, Andrew D.; Kutsch, Werner; Janssens, Ivan A. (2014-04)
    The traditional view of forest dynamics originated by Kira, Shidei, and Odum suggests a decline in net primary productivity (NPP) in ageing forests due to stabilized gross primary productivity (GPP) and continuously increased ...