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Studies on the Situation of Soil Organic Carbon Storage in Croplands in northeast of china

Agricultural Sciences in china 2005年第8期4卷 594-600页

作者： QIU Jian-jun WANG Li-gang TANG Hua-jun LI Hong Changsheng LI Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 P.R.China Meteorology Bureau of Qiqihaer Qiqihaer 161000 P.R.China Complex Systems Research Center Institute for the Earth Oceans and Space University of New Hampshire Durham NH USA

This paper aims to estimate the soil organic carbon （SOC） storage in northeast of china, identify its balance situation and changing trends under current cropping systems, and finally put forward some strategies to keep the SOC in balance. A biogeochemical model （DNDC） for agro-ecosystem was employed to predict SOC dynamics in agricultural ecosystems at regional scale. Data on climate, soil properties, cropping systems, acreage, and management practices at county scale were collected from various sources and integrated into a GIS database to support the model runs at the regional scale. The model predicted results revealed that （1） Total SOC storage in agricultural lands in Heilongjiang, Jilin and Liaoning provinces in northeast of china is about 1 243.48 × 10^6 t （0-30cm soil layer）, respectively occupying 58.4, 25.5 and 16.1%; （2） Under the current cultivation systems, SOC is in a situation of net loss with carbon losing at a high rate of 31.22 × 10^6 t a^-1 （respectively 59.3, 25.9 and 14.8% in Heilongjiang, Jilin and Liaoning provinces） and 2.05 t ha^-1 a^-1, the situation is more serious in Heilongjiang and Jilin provinces; and （3） Protective cultivations, such as manuring, returning more residue of crop to the field, adopting no-till, are very useful for the accumulation of SOC in these regions.

关键词： northeast of china Soil Soil organic carbon Simulation model

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Mercury in coal and its emission by coal combustion in the northeast china

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Journal of Environmental Sciences 2000年第S1期12卷 22-23页

作者： WANG Qi\|chao, HU Xing\|da, MA Ru\|long (Changchun Institute of Geography, Chinese Academy of Sciences,Changchun 130021, china)

This paper reports on the mercury content distribution in coals produced in the northeast of china, and the east of Inner Mongolia, and transmission of mercury from coals into the burned products. The arithmetic average value of mercury content in coals is 0.158 mg/kg, and the mercury content shows considerable positive correlation with ashes in coals. The mercury content in fly ash is increased as the particle diameter of fly ash decrease. After combustion, 23.1—26.9 percent of mercury in coals enters fly ash,and 56.3—69.7 percent of mercury escapes into atmosphere. We estimated that the amount of mercury in raw coals produced in the northeast of china and the east Inner Mongolia was 30.9 tons in the whole year and the amount emitted into atmosphere was 20 30 tons in 1990.

关键词： mercury emission coal combustion northeast of china

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One Family and Three Genera newly recorded of Herbaceous plants in northeast china

One Family and Three Genera newly recorded of Herbaceous pla...

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中国植物学会第十六次全国会员代表大会暨85周年学术年会

作者： MengWang Shumei Zhang Dalian Natural History Museum

northeast of china,located in the East of Eurasia,has varieties of plants species,a total of 164 families,928 genera and 3103 species of vascular bundle *** order to establish the vascular plants germplasm bank,understand the distribution of resources application status,and then protect species diversity and further exploitation,we investigated the vascular plant resources of northeast of *** study of the vascular plant resources of northeast of china via field investigations,previous literature,and the collection and identification of plant specimens,analysed the species diversity,distribution characteristics,distribution patterns and resource *** this paper,based on the results of field investigation and related data,one newly recorded family,three newly recorded genera and their corresponding three new record species are reported（Mollugo stricta L.,Achyranthes bidentata Blume,Dicranostigma leptopodum（Maxim.） Fedde）.The voucher specimens were preserved in the herbarium of Dalian Natural History *** newly recorded plants have a great significant meaning to study the plant species diversity and provide new materials for investigation of their geographical distributions in china.

关键词： northeast of china Herbaceous plants newly recorded classification

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Bioreactor performance and microbial community dynamics in a production-scale biogas plant in northeastern china

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International Journal of Agricultural and Biological Engineering 2017年第1期10卷 191-201页

作者： Gao Yamei Yang Anyi Bao Jun Ma Ruxia Yan Lei Wang Yanjie Wang Weidong College of Life Science and Technology Heilongjiang Bayi Agricultural UniversityDaqing 163319China Synergetic Innovation Center of Food Safety and Nutrition School of Animal Science and TechnologyNortheast Agricultural UniversityHarbin 150030China

In cold regions,heating is necessary to maintain the continuous and steady year-round operation of biogas *** this study,changes in the liquid composition,biogas production,and microbial diversity in heated-and unheated-phase samples were evaluated in a production-scale biogas plant that was fed continuously with cattle manure as a mono-substrate in Heilongjiang province in northeastern *** volatile solid(VS)and volatile fatty acid(VFA)contents both gradually decreased in the heated and unheated fermentation *** chemical oxygen demand(COD)removal efficiency in the unheated phase sampled on June 15(s-6-15)and October 15(a-10-15)and in the heated phase sampled on January 15(w-1-15)was 63.35%,44.2%and 44.0%,*** biogas production yields were in agreement with the results obtained for the VS and VFA contents and COD removal *** performance of the reactor in the heated phase was less efficient than that in the unheated phase,and the biogas production efficiency in June-August was higher than that in the other ***,the CH4 content in the biogas remained similar all ***,ARDRA(Amplified Ribosomal DNA Restriction Analysis)was used to study the microbial community composition in the fermentation *** results showed that the methanogenic archaeal consortium consisted mainly of members of the genera Methanomicrobiales and *** the heated phase,hydrogenotrophic methanogens represented the dominant methanogen in w-1-15 *** fermentation,the strict aceticlastic methanogen Methanosaeta became the dominant *** the unheated phase,the hydrogenotrophic methanogens and aceticlastic methanogens were equivalent in s-6-15 feedstock and effluent,and aceticlastic methanogens were dominant in both a-10-15 feedstock and *** of the bacteria diversity of the microbial communities revealed that the common strains in the feed and effluent of the three samples included

关键词： biogas production production-scale plant dairy manure microbial community northeast of china

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