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Wang X.-Z.,Yangzhou University | Wang X.-Z.,State Key Laboratory of Soil and Sustainable Agriculture | Zhang H.-J.,Yangzhou University | Sun W.,Yangzhou University | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2010

Taking the China rice/wheat FACE (Free-Air Carbon Dioxide Enrichment) as a platform, this paper studied the effects of elevated CO 2 on the NH 4 - -N and NO 3 +-N contents at different depths of paddy soil in rice season. Under elevated CO 2, the NH 4 + -N content in plough layer increased at early growth stage but decreased at late growth stage, and the soil NO 3 --N content at the depths 5, 15, 30, 60, and 90 cm increased by 46.5%, 36.8%, 23.3%, 103.1% , and 42.1% , respectively, with a significant increase occurred at the depths 60 cm (P<0. 01) and 90 cm (P< 0.05 ), compared with the control. Source

Han W.,Nanjing University of Information Science and Technology | Han W.,State Key Laboratory of Soil and Sustainable Agriculture | He M.,Shanghai JiaoTong University | Yang Z.,Nanjing University of Information Science and Technology
Chinese Journal of Environmental Engineering | Year: 2014

Rice straw composting was conducted with exogenous cellulase application. The variation trends of cellulose, hemicellulose, and other related indices during composting were analyzed. The results show that the exogenous cellulase application increased the degradation rate of cellulose and hemicellulose significantly compared with the treatments with no cellulose application, both the trend of degradation rate of cellulose and hemicellulose fitted by a first-order exponential decay equation. Compared with the control group, the cellulose mass fraction decreased 35.1% at the end of composting. In addition, cellulase promoted the synthesis of humic acid of compost, the NH4 +-N, NO3 -N, and total N increased, the C/N decreased by 23.1%; the addition of exogenous cellulose reduced the toxicity of compost, the germination index increased by 10.3%. In conclusion, the exogenous cellulase application can accelerate the composting process by promotion of rice straw degradation. ©, 2014, Science Press. All right reserved. Source

Chen W.,China Agricultural University | Chen W.,State Key Laboratory of Soil and Sustainable Agriculture | Zhang X.,China Agricultural University | Zhang X.,State Key Laboratory of Soil and Sustainable Agriculture | And 2 more authors.
Proceedings of 2010 International Conference on Intelligent Control and Information Processing, ICICIP 2010 | Year: 2010

Due to the overall complexity of wireless sensor networks, programming sensor networks poses considerable impediments and makes application development nontrivial. A middleware layer is a novel approach to glue together the operating systems, network stacks, and applications. In this paper, a new wireless sensor network middleware for collaborative object tracking has been proposed, which is consisted of three related algorithms: the node selection algorithm, the object management algorithm, and the session maintenance algorithm. The simulation results using ns-2 show that in a wireless sensor network using IEEE 802.15.4 protocol, the system with the proposed middleware has better performance than system without the proposed middleware. © 2010 IEEE. Source

Zhou H.,CAS Nanjing Institute of Soil Science | Zhou H.,State Key Laboratory of Soil and Sustainable Agriculture | Feng Y.-F.,CAS Nanjing Institute of Soil Science | Xue L.-H.,Jiangsu Academy of Agricultural Sciences | And 5 more authors.
Research of Environmental Sciences | Year: 2014

The use of synthetic chemical dyes during various industrial processes, including textile, leather, and cosmetics manufacturing, food processing, and paper and dye manufacturing has grown considerably over the past few decades, increasing the amount of dye-containing effluents into terrestrial and aquatic ecosystems. Rhodamine B (RhB) was used as a dye to explore the reciprocal effects between periphytons and RhB. The goals were to find the removal efficiency of RhB by periphytons, and to investigate the effects of RhB on the microbial composition and its ability to utilize diversified carbon sources through Biolog and PLFA(phospholipid fatty acid). The results showed that RhB in the water could be removed by periphytons to some extent. The removal rate reached 29.2% after the first day, and then decreased on average 3.9% in each following day. The total removal rate reached 68.6% after 11 days of the experiment. The results also showed that the PLFA value of the periphytons decreased by 52.23%, and the diversity of bacteria, fungus and actinomycete decreased 75.81%, 67.03% and 100%, respectively. Biolog study showed that the low concentration of RhB lead to a reduction of AWCD value, and affected the microbial utilization of 31 carbon sources. However, the results also suggested that the microbial communities were not completely destroyed after exposure to RhB. In conclusion, periphytons were found to be efficient for the removal of low concentrations of RhB, but the dye might affect the microbial composition and its ability to utilize diversified carbon sources. Source

Feng Y.,Jiangsu Academy of Agricultural Sciences | Feng Y.,State Key Laboratory of Soil and Sustainable Agriculture | Dionysiou D.D.,University of Cincinnati | Wu Y.,State Key Laboratory of Soil and Sustainable Agriculture | And 6 more authors.
Bioresource Technology | Year: 2013

Swede rape straw (Brassica napus L.) was modified by oxalic acid under mild conditions producing an efficient dye adsorbent (SRSOA). This low-cost and environmental friendly bioadsorbent was characterized by various techniques and then applied to purify dye-contaminated aqueous solutions. Equilibrium study showed that the Langmuir model demonstrated the best fit to the equilibrium data and the methylene blue (MB) adsorption capacity calculated by this model was 432mgg-1. The adsorption process and mechanism is also discussed. To properly deal with the dye-loaded bioadsorbents, the disposal methodology is discussed and a biochar based on depleted bioadsorbents was for the first time produced and examined. This method both solved the disposal problem of contaminant-loaded bioadsorbents and produced an useful adsorbent thereafter. The study indicates that SRSOA is a promising substitute for ACs in purifying dye-contaminated wastewater and that producing biochars from contaminant-loaded bioadsorbents maybe a feasible disposal method. © 2013 Elsevier Ltd. Source

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