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Yang Z.,Beijing Academy of Agricultural and Forest Science | Li H.,Beijing Academy of Agricultural and Forest Science | Zhang W.W.,Beijing Academy of Agricultural and Forest Science | Bai J.,Chinese Academy of Agricultural Sciences
Journal of Computational and Theoretical Nanoscience | Year: 2016

Aneurinibacillus thermoaerophilus strain AFNA, a novel isolated extracellular thermostable organic solvent tolerant lipase producing bacterium, is currently crucial in biotechnology studies. Here, the lipase production of strain AFNA and its correlation with bacterial growth was studied via a modeling assessment by artificial neural network (ANN) and support vector machine (SVM) techniques. To achieve the optimal conditions for the lipase specific activity and bacterial growth, different models were established respectively by general regression neural network (GRNN), multilayer feed-forward neural network (MLFN) and the SVM models. By comparing the training times and RMSEs, the best models were selected. Results shows that the MLFN model is the most suitable one for the prediction of lipase specific activity (RMSE: 1.98, prediction accuracy: 100%) and the SVM is the best model for the prediction of bacterial growth (RMSE: 0.40, prediction accuracy: 100%). Copyright © 2016 American Scientific Publishers All rights reserved.


Yang Z.,Beijing Academy of Agricultural and Forest Science | Zhou L.,Beijing Academy of Agricultural and Forest Science | Lv Y.,China Agricultural University | Li H.,Beijing Academy of Agricultural and Forest Science | And 2 more authors.
Advanced Science Letters | Year: 2013

Tillage practices influence the aggregation and stability of soil aggregates. The objective of this study was to investigate the effects of different tillage treatments on soil aggregate characteristics. Soils were sampled from four depth intervals of No-tillage (NT), Rotary tillage (RT), and conventional tillage (Moldboard tillage, CT) treatments at the Luancheng Research Station in Hebei Province. Measurements of mean weight diameter (MWD), geometric mean diameter (GMD), proportion of macro-aggregates (R0.25), and fractal dimension (D) were employed to characterize aggregate size distribution and stability. The results indicated that the NT treatment significantly increased the topsoil (0-5 cm) bulk density (BD), while the RT treatment increased BD in the 10-20 cm interval. The NT treatment had higher Macro-aggregate content (R0.25), and a larger MWD and GMD than other treatments in the 0-10 cm layer, while RT showed no difference with CT. The wet sieving results showed that most of the aggregates were unstable. At 0-10 cm layer, the fractal dimension (D) of aggregates under NT was lower than it was under RT or CT. R0.25 was positively linear correlated with MWD (R2 > 0.85), while D was negatively linear correlated with MWD, with R2 = 0.76. After four years, NT increased the aggregation and the stability of soil aggregates and bulk density, while intensive soil disturbance in RT and CT systems decreased the aggregation and stability, but maintained low bulk density in the upper layer (0-10 cm). © 2013 American Scientific Publishers All rights reserved.


Yang J.-G.,Beijing Academy of Agricultural and Forest Science | Xu K.,Fangshan Institute of Agricultural Science | Tong E.-J.,Fangshan Institute of Agricultural Science | Cao B.,Beijing Academy of Agricultural and Forest Science | And 2 more authors.
Chinese Journal of Applied Ecology | Year: 2010

An open field experiment was conducted to study the effects of applying controlled-release fertilizer blended with rapidly available chemical N fertilizer on Chinese cabbage yield and quality as well as nitrogen losses, including ammonia volatilization and NO 3 --N accumulation and leaching in Beijing suburb. The results showed that a combined application of 2:1 controlled-release fertilizer and urea fertilizer (total N rate 150 kg • hm -2) did not induce the reduction of Chinese cabbage yield, and decreased the leaf nitrate and organic acid contents significantly, compared with conventional urea N application (300 kg • hm -2), and had no significant difference in the cabbage yield and leaf nitrate content, compared with applying 150 kg • hm -2 of urea N. The combined application of 2:1 controlled-release fertilizer and urea fertilizer improved the N use efficiency of Chinese cabbage, and reduced the ammonia volatilization and NO 3 --N leaching. At harvest, the NO 3 --N concentrations in 20-40, 60-80 and 80-100 cm soil layers were significantly lower in the combined application treatment than in urea N treatment.


Cao J.,Beijing Academy of Agricultural and Forest Science | Wu J.,China Agricultural University | Zhao X.,China Agricultural University | Li G.,China Agricultural University | And 3 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2010

Soil microbial diversity is closely related to soil quality and one of research hotspots in soil science. In this study, 9 surface soils (0-20 cm) were collected from 9 typical chestnut orchard gardens in Beijing. Carbon catabolic diversity of the soils was measured by BIOLOG Eco plate containing 31 substrates. Our aim was to compare the difference in carbon catabolic diversity of the 9 soils. The results showed that the 9 soils could be classified into three groups of ( 1 ) soil No. 1, 6 and 9, (2) soil No. 2, 5 and 7, (3) soil No. 3, 4 and 8. The carbon catabolic diversity of the soils in same group was similar, but significant different among each group. Soil No. 1, 6 and 9 had more microbes metabolizing D-malic acid and another 6 substrates, but less in using glucose-1-phosphate and another 14 substrates. In contrary, soil No. 2, 5 and 7 had a reverse pattern of metabolizing the 31 substrates. Soil No. 3, 4 and 8 had similarity in using D-malic acid and another 6 substrates, but much less microbes in using i-erythritol, D-xylose, 2-hydroxy-benzoic acid. Currently, we have less knowledge on the roles and importance of carbon catabolic diversity in soil sustainable management. Further work may be particularly necessary to understand the links of this functional diversity of soil microbial community with soil microbiological processes of C, N, P transformation.


Yang Z.,Beijing Academy of Agricultural and Forest Science | Zhou L.,Beijing Academy of Agricultural and Forest Science | Lv Y.,China Agricultural University | Li H.,Beijing Academy of Agricultural and Forest Science
Advanced Materials Research | Year: 2012

Long-term effects of inorganic and corn stalks organic nutrient sources on yield, soil organic carbon(SOC) and the relationship between crop yield and SOC were investigated in Dry-Land Farming Institute of Hebei Academy of Agricultural and Forestry Sciences, Hengshui, Hebei Province, China from 1981 to 2005. Hengshui is a part the North China Plain and the dominant cropping systems are Winter wheat-maize rotations. Recently the use of organic manure with grain crops has almost disappeared. This could reduce soil fertility and crop productivity in the long run. There were sixteen treatments applied to both wheat and maize seasons: Inorganic fertilizers as main plots and corn stalks as subplots and the main plot and subplot all have four levels expressed A and B respectively. So there are sixteen treatments with three replicates were set (A1,A2,A3,A4)*(B 1,B2,B3,B4). After more than 20 years crop yield and SOC decreased in treatment of without fertilizers and only applicate corn stalks just sustain it. Combine application of inorganic fertilizers and corn stalks increase SOC and crop yield very strongly. For crop yield the more fertlizers the more increase. But the SOC will decrease as the more inorganiac fertlizer application and increase with the increase of corn stalks. © (2012) Trans Tech Publications, Switzerland.


Li Y.M.,Beijing Academy of Agricultural and Forest Science | Li Y.M.,CAS Institute of Geographical Sciences and Natural Resources Research | Li Y.M.,Key Laboratory of Urban Agriculture North | Zhou X.Y.,CAS Institute of Geographical Sciences and Natural Resources Research | Yang J.,CAS Institute of Geographical Sciences and Natural Resources Research
Applied Mechanics and Materials | Year: 2014

We investigated soil physiochemical properties and heavy metal contamination characteristics in steel and chemical sites, aimed to provide theoretical basis for future site remediation. Results indicated that: soils in both sites showed sandy and alkaline trend. Soil total phosphorus, total potassium, and available nitrogen content in steel site, and total and available nitrogen, phosphorus and potassium content in chemical site were lower than that in farmland soil. Soil lead and zinc contamination in steel site and soil arsenic contamination in chemical site should be given priority in remediation. In addition, cadmium and arsenic risk in steel site and mercury risk in chemical site should also be paid sufficient attention. © (2014) Trans Tech Publications, Switzerland.


Yang Z.,Beijing Academy of Agricultural and Forest Science | Lv Y.,China Agricultural University | Li H.,Beijing Academy of Agricultural and Forest Science
Journal of Coastal Research | Year: 2015

The Ordos sand land is a typical sandy desertification area in northern China. Changes of soil organic matter and the combined humus in soil aggregate could be the index of soil desertification. The objectives of this study were: (i) to analyze the changes in soil organic carbon during the desertification process; (ii) to assess the distribution of soil combined humus and its changes in different aggregates. In this study, we selected the typical communities that represented a series of plant succession stages in the desertification process. Soil samples were collected from the plots under three successional plant communities and analyzed for total organic matter (SOM) under different degenerated gradients. We classified the aggregates into different groups and determined the combined humus in different size aggregates using the mechanical analysis method. The results showed that SOM decreased remarkably in surface soil (0-5 cm) from the steppe grass Stipa Bungeana to desert grass Cynanchum komorovii, during the desertification process. The fractions of soil combined humus were 36.63%, 28.84%, and 39.53% for loose combined humus, stable combined humus and tight combined humus with respectively average content. All fractions of soil combined humus carbon content decreased as the aggregate size decreased. In the desertification process at the Ordos sand land, the stable combined humus and tight combined humus decreased strongly in > 50 μm aggregate. The decreasing of humus carbon is mainly due to the losing of stable combined humus, especially in large size aggregates. With the development of the desertification, the soil organic carbon decreased with remarkable difference among different stages and the combined humus decreased with remarkable difference in different size aggregates among different stages. © 2015 Coastal Education and Research Foundation, Inc.


Yang Z.C.,China Agricultural University | Yang Z.C.,Beijing Academy of Agricultural and Forest Science | Zhao N.,China Agricultural University | Huang F.,China Agricultural University | Lv Y.Z.,China Agricultural University
Soil and Tillage Research | Year: 2015

The aim of the study is to analyze the effects of different fertilization of organic and inorganic fertilizers on soil organic carbon (SOC) sequestration and crop yields after a 22 years long-term field experiment. The crop yields and SOC were investigated from 1981 to 2003 in Dry-Land Farming Research Institute of Hebei Academy of Agricultural and Forestry Sciences, Hebei Province, China. The dominant cropping systems are winter wheat-summer corn rotation. There were totally sixteen treatments applied to both wheat and corn seasons: inorganic fertilizers as main plots and corn stalks as subplots and the main plots and subplots all have four levels. The results revealed: after 22 years, mixed application of inorganic fertilizers and crop residuals, the SOC and crop yields substantially increased. Higher fertilizer application rates resulted in greater crop yields improvement. In 2002-2003, wheat and corn for the highest fertilizer inputs had the highest yield level, 6400kgha-1 and 8600kgha-1, respectively. However, the SOC decreased as the excessive inorganic fertilizer input and increased with the rising application of corn stalks. The treatment of the second-highest inorganic fertilizer and the highest corn stalks had the highest SOC concentration (8.64gCkg-1). Pearson correlation analysis shows that corn and winter wheat yields and the mineralization amount of SOC have significant correlation with SOC at p<0.05 level. © 2014 Elsevier B.V.


Wang Z.-Y.,Chinese Academy of Agricultural Sciences | He K.-L.,Chinese Academy of Agricultural Sciences | Zhang F.,Beijing Academy of Agricultural and Forest science | Lu X.,Jilin Agricultural University | Babendreier D.,CABI Switzerland
Biological Control | Year: 2014

Corn (Zea mays L., Poaceae) is ranked first as food crop in planting area and in total yield production in China. Asian corn borer, Ostrinia furnacalis, is the most destructive pest of corn in China, causing 6-9 million tons of yield loss per year on average. Trichogramma has been released for control of Asian corn borer at large scale since the 1970's, partly triggered by the fact that Trichogramma dendrolimi can be successfully mass reared on eggs of the Chinese oak silkworm, Antheraea pernyi. Eggs of different hosts, such as Eri-silkworm, Samia cynthia ricini, A. pernyi, the Rice moth, Corcyra cephalonica, the Angoumois grain moth, Sitotroga cerealella and also artificial host eggs were tested and successfully used to mass-rear various Trichogramma species in China since then. The mass production technology and release technique of Trichogramma have been greatly improved in recent years making Trichogramma production and field application more practical and cost efficient. Nowadays, nearly 4 million hectares of corn are treated with T. dendrolimi, Trichogramma chilonis and Trichogramma ostriniae annually, mainly in North-east China. Large ecological and economic benefits have been achieved in areas where Trichogramma have been released continuously for many years. This includes an increase of natural populations of Trichogramma and other natural enemies in cornfields, the avoidance of any insecticide treatments in corn, a reduction in mycotoxin contamination and overall higher yields. The release of Trichogramma for controlling Asian corn borer and other lepidopteran pests became one of the key measures in corn IPM in China. Trichogramma applications combined with other non-chemical control measures for corn insect pests IPM began a new era in China as the new concept of "Public Plant Protection, Green Plant Protection" was put forward in 2006 as the guideline for plant protection in China. The future prospects and challenges of Trichogramma application are also discussed in this review. © 2013.


Yang Z.C.,Beijing Academy of Agricultural and Forest Science | Li H.,Beijing Academy of Agricultural and Forest Science | Zhou L.D.,Beijing Academy of Agricultural and Forest Science | Bai J.S.,Chinese Academy of Agricultural Sciences
Advanced Materials Research | Year: 2013

By analyzing the different crop interplanting test in chestnut forests, the results show that soil nitrate nitrogen, ammonium nitrogen and available phosphorus fell in October when intercropped plants, this may be related to the growth of chestnut trees absorb nutrients and microorganisms in the soil. The results of this study show that interplanting different plants had an impact on soil microbial biomass carbon and microbial biomass phosphorus. Microbial biomass carbon turnover rate in the order: ryegrass > clean tillage > natural grass > Alfalfa > flat Agropyron > soybean; turnover rates of soil microbial biomass phosphorus in the order: clean tillage > Alfalfa > ryegrass natural grass > soy > flat crested wheatgrass. © (2013) Trans Tech Publications, Switzerland.

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