Time filter

Source Type

Ren L.,Inner Mongolia Agricultural University | Ma X.-Z.,Inner Mongolia Agricultural University | Li C.-S.,Inner Mongolia Meteorological Administration
Chinese Journal of Ecology | Year: 2014

Fire is one of the most important disturbance factors in forest ecosystems. Forest fires destroy forest resources and cause greenhouse gases emission from soil to atmosphere. At the same time, forest fires can affect soil physical, chemical and microbial properties, and consequently the fluxes of main greenhouse gases between soil and atmosphere. In this paper, we briefly reviewed the effects of different fire intensities on soil physical properties (such as soil structure, soil density, field water holding capacity and soil gross porosity), soil chemical properties (such as pH, nutrient contents), and soil microbial properties (such as microbial community structure, and microbial biomass C and N). We summarized the variations of soil CO2, CH4, and N2O fluxes after different fire intensities and different time intervals, especially in the permafrost areas which are sensitive to global warming. The charcoal could be produced in forest fire under the condition of high temperature and less oxygen. We also summarized management methods for biochar in burned areas such as cleaning or burial, and their effects on soil properties and greenhouse gases fluxes. Finally, some problems unresolved in the research at present are identified, and the perspectives for further study are also proposed.

Ma X.-Z.,Inner Mongolia Agricultural University | Zhang Q.-L.,Inner Mongolia Agricultural University | Li C.-S.,Inner Mongolia Meteorological Administration | Chen G.-W.,Inner Mongolia Agricultural University | Wang F.,Inner Mongolia Agricultural University
Chinese Journal of Applied Ecology | Year: 2012

By using static chamber-gas chromatograph technique, an in situ measurement was conducted on the soil CH4, CO2, and N2O fluxes in a cold-temperate Larix gmelinii forest in Inner Mongolia from June to September 2007, aimed to understand the diurnal and seasonal variations of soil greenhouse gasses fluxes and their relations with the associated environmental factors in L. gmelinii forests in cold-temperate zone. In growth season, the soil in the L. gmelinii forest was the sink of atmospheric CH4, with the flux ranged from 22.3 to 107.8 μg CH4-C · m-2 · h-1. The mean monthly uptake of CH4 in June, July, August, and September was 34.0 ± 7.1, 71.4 ±9.4, 86.3 ± 7.9, and 40.7 ± 6.2 μg · m-2 · h-1, respectively. The mean diurnal flux of soil CH4 from June to September showed the same variation trend, i. e., peaked at 10:00 am. The diurnal variation of soil CO2 flux showed an obvious double-peak, and the mean monthly CO2 flux was in the order of July>August>June>September. Soil N2O flux varied dramatically from -9.1 to 31.7 μg · m-2 · h-1. Soil temperature and humidity were the main factors affecting the CH4 and CO2 fluxes, and soil temperature mainly affected the N2O flux. In the L. gmelinii forest, the CH4, CO2, and N2O fluxes measured at 10:00 am could represent the diurnal CH4, CO2, and N2O fluxes on the same day.

Ma X.-Z.,Inner Mongolia Agricultural University | Li C.-S.,Inner Mongolia Meteorological Administration | Ren L.,Inner Mongolia Agricultural University | Wang P.-F.,Inner Mongolia Meteorological Administration
Chinese Journal of Ecology | Year: 2014

Biochar is a charcoal produced under high temperatures using crop residues, animal manure, or any type of organic material. Biochar has multiple potential environmental benefits, foremost the potential to sequester carbon in soil for hundreds to thousands of years, which consequently can slow down the greenhouse effect so as to restrict global warming. Crop yields can increase as a result of applying biochar as a soil amendment. Moreover, greenhouse gas emissions are reduced significantly with biochar application to crop fields. However, obstacles exist that may stall rapid adoption of biochar production systems, including technology costs, feedstock availability, and the uncertainty of long-term effect of biochar application. Some characteristics of biochar depend on the biomass source and temperature, duration and method of pyrolysis. The effects of biochar on soil physical, chemical, microbial properties and emissions of greenhouse gases (such as carbon dioxide, methane and nitrous oxide) were reviewed. We also summarized the effects of biochar on rice production and greenhouse gas emissions in southern China and other foreign areas, and the characteristics of charcoal produced in forest fire and its environmental effects. © 2014, Editorial Board of Chinese Journal of Ecology. All rights reserved.

Discover hidden collaborations