Nutrient Cycling in Agroecosystems

Công bố khoa học tiêu biểu

* Dữ liệu chỉ mang tính chất tham khảo

Sắp xếp:  
Modeling Trace Gas Emissions from Agricultural Ecosystems
Nutrient Cycling in Agroecosystems - Tập 58 Số 1 - Trang 259-276 - 2000
Li, C.S.
A computer simulation model was developed for predicting trace gas emissions from agricultural ecosystems. The denitrification-decomposition (DNDC) model consists of two components. The first component, consisting of the soil climate, crop growth, and decomposition submodels, predicts soil temperature, moisture, pH, Eh, and substrate concentration profiles based on ecological drivers (e.g., climat...... hiện toàn bộ
Canadian greenhouse gas mitigation options in agriculture
Nutrient Cycling in Agroecosystems - Tập 60 Số 1 - Trang 317-326 - 2001
Desjardins, R.L., Kulshreshtha, S.N., Junkins, B., Smith, W., Grant, B., Boehm, M.
In 1991, on farm management practices contributed 57.6 Tg CO2 equivalent in greenhouse gas emissions, that is, about 10% of the anthropogenic GHG emissions in Canada. Approximately 11% of these emissions were in the form of CO2, 36% in the form of CH4 and 53% in the form of N2O. The CO2 emissions were from soils; CH4 emissions were from enteric fermentation and manure, and N2O emissions were prima...... hiện toàn bộ
Contribution of livestock excreta to nutrient balances
Nutrient Cycling in Agroecosystems - Tập 66 Số 2 - Trang 119-131 - 2003
Sheldrick, William, Keith Syers, J., Lingard, John
Livestock excreta make an important contribution to soil nutrient inputs and in many developing countries are the only significant input. However, there is little quantitative information available on excreta, manure production, and application and this makes it difficult to obtain meaningful soil nutrient balances. A model has therefore been developed to calculate the excreta produced and manure ...... hiện toàn bộ
Comparing measured and Expert-N predicted N2O emissions from conventional till and no till corn treatments
Nutrient Cycling in Agroecosystems - Tập 66 Số 2 - Trang 107-118 - 2003
Kaharabata, S.K., Drury, C.F., Priesack, E., Desjardins, R.L., McKenney, D.J., Tan, C.S., Reynolds, D.
Agricultural soils are a major source of the greenhouse gas nitrous oxide (N2O). Nitrous oxide emission models can be used to predict the effectiveness of N2O mitigation strategies; however, these models require rigorous testing before they can be used with confidence. Expert-N, a modular process based N2O emission model, was tested to determine its ability at predicting nitrogen (N) cycling in th...... hiện toàn bộ
Amelioration of Al toxicity and P deficiency in acid soils by additions of organic residues: a critical review of the phenomenon and the mechanisms involved
Nutrient Cycling in Agroecosystems - Tập 59 Số 1 - Trang 47-63 - 2001
Haynes, R.J., Mokolobate, M.S.
High rates of lime and fertilizer-P are characteristically required to obtain high crop yields on highly weathered acid soils. Much of the agriculture in the southern tropical belt, where acid soils predominate, is carried out by resource-poor, semi-subsistence farmers who are unable to purchase large quantities of lime and fertilizer. There are, however, a number of reports that additions of orga...... hiện toàn bộ
Measurement of nitrous oxide emissions from two rice-based cropping systems in China
Nutrient Cycling in Agroecosystems - Tập 64 Số 1 - Trang 125-133 - 2002
Xiong, Z.Q., Xing, G.X., Tsuruta, H., Shen, G.Y., Shi, S.L., Du, L.J.
A field experiment was conducted to investigate the effects of winter management and N fertilization on N2O emission from a double rice-based cropping system. A rice field was either cropped with milk vetch (plot V) or left fallow (plot F) during the winter between rice crops. The milk vetch was incorporated in situ when the plot was prepared for rice transplanting. Then the plots V and F were div...... hiện toàn bộ
Comparing a process-based agro-ecosystem model to the IPCC methodology for developing a national inventory of N2O emissions from arable lands in China
Nutrient Cycling in Agroecosystems - Tập 60 Số 1 - Trang 159-175 - 2001
Li, Changsheng, Zhuang, Yahui, Cao, Meiqio, Crill, Patrick, Dai, Zhaohua, Frolking, Steve, Moore, Berrien, Salas, William, Song, Wenzhi, Wang, Xiaoke
Nations are now obligated to assess their greenhouse gas emissions under the protocols of Article 4 of the United Nations Framework Convention on Climate Change. The IPCC has developed `spreadsheet-format' methodologies for countries to estimate national greenhouse gas emissions by economic sector. Each activity has a magnitude and emission rate and their product is summed over all included activi...... hiện toàn bộ
The long-term effects of manures and fertilisers on soil productivity and quality: a review
Nutrient Cycling in Agroecosystems - Tập 66 Số 2 - Trang 165-180 - 2003
Edmeades, Douglas C.
The results from 14 field trials comparing the long-term (20 to 120 years) effects of fertilisers and manures (farmyard manure, slurry, and green manure) on crop production and soil properties are reviewed. In total there were 24 paired comparisons of the effects of manure and fertiliser. Some of the trials also contained a control (no nutrient inputs) treatment. The input of nutrients as either f...... hiện toàn bộ
Quantitative dependence of methane emission on soil properties
Nutrient Cycling in Agroecosystems - Tập 64 Số 1 - Trang 157-167 - 2002
Huang, Yao, Jiao, Yan, Zong, Lianggang, Zheng, Xunhua, Sass, Ronald L., Fisher, Frank M.
To identify the key soil parameters influencing CH4 emission from rice paddies, an outdoor pot experiment with a total of 18 paddy soils was conducted in Nanjing Agricultural University during the 2000 rice growing season. The seasonal average rate of CH4 emission for all 18 soils was 6.42±2.70 mg m−2 h−1, with a range of 1.96 to 11.06 mg m−2 h−1. Correlation analysis indicated that the seasonal a...... hiện toàn bộ
Emissions of NH3, N2O and CH4 from dairy cows housed in a farmyard manure tying stall (housing, manure storage, manure spreading)
Nutrient Cycling in Agroecosystems - Tập 60 Số 1 - Trang 103-113 - 2001
Amon, B., Amon, Th., Boxberger, J., Alt, Ch.
Emission measurements from dairy cows housed in a tying stall were carried out with the aim of finding factors that influence the amount of emissions and means to reduce emissions. All sectors of animal husbandry were investigated. This enabled calculations of emissions for the whole management system including housing, storage and spreading of manure. Emissions during aerobic composting and anaer...... hiện toàn bộ
Tổng số: 11   
  • 1
  • 2