Guanhua Dai

Learn More
BACKGROUND Soil water and nitrogen (N) are considered to be the main environmental factors limiting plant growth and photosynthetic capacity. However, less is known about the interactive effects of soil water and N on tree growth and photosynthetic response in the temperate ecosystem. METHODS/PRINCIPAL FINDINGS We applied N and water, alone and in(More)
Employing root-wrenching method and LI-6400-09 soil respiration chamber, this paper measured the diurnal changes of soil respiration rate with and without roots in situ on June 17, August 5, and October 10, 2003. The seasonal changes of soil respiration were also measured from May to September, 2004. The results showed that both the total and the(More)
Forest fine roots contribute substantially to carbon cycling, and old growth forests have an important role in the global carbon budget. We, hence, studied temporal variation in fine root production and turnover in an old forest. Fine root dynamics were investigated, using sequential soil cores for 6 years, and related to rainfall and air temperature in a(More)
Based on the gradient measurement of microclimate factors, radiation and soil heat flux from late May to early October, 2001 and by the method of Bowen ratio-energy balance (BREB), this paper estimated the latent heat and sensible heat above the broadleaved Korean pine forest in Changbai Mountains. The energy storage of forest air and vegetative was(More)
In this paper, the floor and epiphytic bryophyte biomass was sampled from the dark coniferous forest on the north slope of Changbai Mountain, with an altitude from 1100 m to 1700 m. The floor bryophyte biomass was measured by the method of transect sampling, and epiphytic bryophyte biomass was measured by McCune method. The results showed that bryophytes(More)
In order to analyze the Bovine Serum Albumin role's in ITS-PCR technique. We observed the improvement of ITS-PCR application through added BSA in PCR systems. The result shown: In fungi ITS-PCR analysis process, adding BSA should improve the ITS-PCR amplification effect notably and reduce the amount of Taq enzymes, the best use concentration of BSA of 2(More)
The environmental changes arising from nitrogen (N) deposition and precipitation influence soil ecological processes in forest ecosystems. However, the corresponding effects of environmental changes on soil biota are poorly known. Soil nematodes are the important bioindicator of soil environmental change, and their responses play a key role in the feedbacks(More)
  • 1