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| There are 12 papers published in subject: > since this site started. | |||
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| 1. The families Ruminococcaceae, Lachnospiraceae and Clostridiaceae are the dominant bacterial groups during reductive soil disinfestation | |||
| HUANG Xinqi | |||
| Agronomy 04 July 2017 | |||
| Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
| Abstract:Reductive soil disinfestation (RSD), alternatively named as biological soil disinfestation or anaerobic soil disinfestation, is proven to be an environmentally friendly method to control soil-borne disease. Microorganisms are regarded as the key contributors for RSD, however, the relative investigations about these microbe which was essential for the in deep understanding of RSD are deficient. In this study, RSD was performed in four soils, and the bacterial community during the RSD process was detected using pyrosequencing based on bacterial 16S rDNA. The results showed that RSD significantly changed soil bacterial community structure and reduced the bacterial richness and diversity. The relative abundance of Firmicute profoundly increased as an alternative of the decreases in the relative abundances of Actinobacteria and Acidobacteria. Ruminococcaceae, Lachnospiraceae and Clostridiaceae belonging to Clostridiales within Firmicute were the three dominant bacterial families during RSD process in most soils. Ruminococcaceae and Lachnospiraceae, rather than Clostridiaceae which was recognized as the key contributor, were tightly related to the pH decrease in RSD as an indicator of the SCFA accumulation. In addition to these mutual bacterial groups, the families Sphingobacteriales, Bacillales, Burkholderiales and Bacteroidales were also enriched in specific RSD treated soils. | |||
| TO cite this article:HUANG Xinqi. The families Ruminococcaceae, Lachnospiraceae and Clostridiaceae are the dominant bacterial groups during reductive soil disinfestation[OL].[ 4 July 2017] http://en.paper.edu.cn/en_releasepaper/content/4738505 | |||
| 2. Climate Change and Soil Moisture Response Characteristics of Desert Steppe | |||
| WANG Meng,DANG Xiaohong,CUI Xiangxin,DING Yanlong,LIU Zongqi,MENG Zhongju | |||
Agronomy 16 June 2016
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| Abstract: Analyzing the change of soil moisture of grassland caused by climate change has prevalent meaning in restoring ecological environment of grassland. In this study, precipitation, air temperature and evaporation capacity were taken as the main meteorological factors, climate trends and soil moisture response features of desert steppe in Inner Mongolia were analyzed. The results showed: the tendency of climate change in Inner Mongolia desert steppe was according with global Change in recent 40 years, which presented as drought, warming trends; precipitation and evaporation were the main factors in affecting soil moisture, climatic warming creates more evaporation; the difference between annual evaporation and rainfall was the intuitional factor for analysis the impact of climate change on soil water, which could better reflect soil water supply and consumption levels under the natural condition. | |||
| TO cite this article:WANG Meng,DANG Xiaohong,CUI Xiangxin, et al. Climate Change and Soil Moisture Response Characteristics of Desert Steppe[OL].[16 June 2016] http://en.paper.edu.cn/en_releasepaper/content/4697800 | |||
| 3. An investigation into the effect of maize production by mixing Softrock with the sandy soil of the Mu Us Sandy Land, China | |||
| ZHANG Weihua,HAN Jichang,WANG Huanyuan,DU Yichun,XIE Jiancang | |||
| Agronomy 21 December 2015 | |||
| Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
| Abstract:Agricultural production in the Mu Us Sandy Land has been restricted by soil desertification. To investigate the effects of mixing Softrock with the sandy soil, a field experiment was conducted from 2010 to 2013 to study the effects on soil texture, soil aggregates, soil organic matter (SOM), and maize (Zea mays L.) yields under conventional tillage. The experiment mixed Softrock with the sandy soil at three different ratios: 1:1 (A1), 1:2 (A2), 1:5 (A5) in the uppermost 0-30 cm of the soil profile. A control sample with a ratio of 0:1 (A0) was also examined. It was found that the soil textures changed to a loamy sand, sandy loam, or a sandy clay loam through the soil profiles. After four years planting, SOM increased from 0.9 to 5.1 g kg-1, 0.6 to 2.8 g kg-1, 0.9 to 5.9 g kg-1, and from 0.6 to 3.7 g kg-1 in A1, A2, A5, and A0 treatments, respectively, in the top 15 cm. The SOM was significantly higher in A1, A2, and A5 treatments when compared to the A0 treatment. Soil aggregates also increased due to the addition of Softrock to the sandy soil. Maize yields for A1, A2, and A5 reached 7.3-10.5 Mg ha-1, and increased 98-104%, 90-122%, and 106-124%, respectively, compared to the A0 treatment. The addition of Softrock to the sandy soil in the Mu Us Sandy Land, therefore, altered the soil texture, increased soil aggregate content, increased SOM content, and increased maize yield. | |||
| TO cite this article:ZHANG Weihua,HAN Jichang,WANG Huanyuan, et al. An investigation into the effect of maize production by mixing Softrock with the sandy soil of the Mu Us Sandy Land, China[OL].[21 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4672640 | |||
| 4. The technical difficulties in agricultural soil survey and their solutions | |||
| CAO Zhiping | |||
Agronomy 04 November 2014
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| Abstract:There are six major aspects of technical difficulties for soil quality survey: 1) accurate measurement of of soil fungal and bacterial biomass carbon; 2) rapid measurement of the number and biomass of various functional groups of soil animals; 3) castigation/revision of the physiological parameters for the soil food web model; 4) the in situ measurement of the respiratory intensity of soil biota; 5) the inter-conversions among soil organic carbon fractions measured by various physical, chemical and biological methods; 6) establishment of the soil organic carbon model driven by microbial functional groups. For the solutions, possible technical routes were proposed. | |||
| TO cite this article:CAO Zhiping. The technical difficulties in agricultural soil survey and their solutions[OL].[ 4 November 2014] http://en.paper.edu.cn/en_releasepaper/content/4616967 | |||
| 5. Effects of ArbuscularMycorrhizalFungal Inoculation and Phosphorous Addition on Maize Photosynthesis and Growth in AReclaimed Soil of Mining Area | |||
| HAO Xianjun,Zhang Tiequan,HONG Jianping | |||
Agronomy 10 January 2013
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| Abstract:Phytoremediation of the mining disturbed land has been a challenge due mostly to the low bioavailability of soil indigenous phosphorus (P), low water retention capacity and the low fertilizer P use efficiency in arid and semiarid regions. Arbuscular mycorrhizal fungi (AMF) has been shown to increase crop P uptake. However, inoculation effectiveness and responses of maize in the remediation of mining disturbed soils are unknown. In addition, the quantitative relationship between amendment of fertilizer P and photosynthesis and growth parameters are scarce. A greenhouse experiment was conducted to evaluate the effects of AMF (Glomus Mosseae) inoculation and fertilizer P addition on and to quantify the relationship with leaf photosynthesis and growth of maize. Root colonization, photosynthesis, water use efficiency and growth parameters of maize were either linearly or quadratically related to fertilizer P rate. Root colonization and net photosynthetic rate (Pn) of maize were estimated to obtain maximum value at 73 and 80 mg kg-1 P rate in rehabilitated mining area regardless of inoculation of AMF, while maize dry mass inoculated with AMF will attain maximum at 75 mg kg-1 P rate. Inoculation with AMF decreased the influence of fertilizer P to the above mentioned parameters. In addition, at the range of 0-100 mg kg-1 P rate inoculation with AMF significantly increased by 12.2 % on Pn, 21.9 % on leaf area, 31.7 % on shoot dry mass and 44.3 % on P use efficiency, while decreased 26.4 % on Tr and 28.9 % on Ci, related to NAMF. Inoculation of AMF had no effects on plant height. In conclusion, aforementioned parameters were dependent of fertilizer P amendment in P-deficiency rehabilitated mining area. Inoculation with G. Mosseae and applying of fertilizer P informed symbiosis and increased photosynthesis and growth of maize. The results are practically significance for the phytoremediation program of rehabilitated mining areas once validated under field conditions. | |||
| TO cite this article:HAO Xianjun,Zhang Tiequan,HONG Jianping. Effects of ArbuscularMycorrhizalFungal Inoculation and Phosphorous Addition on Maize Photosynthesis and Growth in AReclaimed Soil of Mining Area[OL].[10 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4509184 | |||
| 6. TEM/EDX investigation on adsorption of Pb on soil mineral components | |||
| WANG siyuan,LU shenggao | |||
| Agronomy 10 January 2013
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| Abstract:Lead (Pb) adsorption on different mineral phases in two soils (Endoaquoll and Plinthudult) was studied using transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDX), and selected area electron diffraction (SEAD) in order to characterize the lead adsorption sites and adsorption capacity of different mineral phases. The adsorption of lead on two soils followed the Langmuir adsorption isotherm with a maximum adsorption capacity of 9460.7 for Endoaquoll and 5662.2 mg kg-1 for Plinthudult, respectively. Among various mineral phases in soils, larger size primary minerals rich in Si and Al were no EDX measurable Pb adsorption, indicating these mineral phases were not main adsorption carriers for Pb. In Endoaquoll, TEM observation and SEAD suggested that Pb carriers of soil consisted of amorphous and crystalline clay mineral phases rich in Si, Al and Fe. The maximum Pb adsorption (8.79 wt.%) was in the crystalline clay phases containing higher amount of Fe. In Plinthudult, Pb was found to be linked to the clay minerals, and amorphous or/and well crystalline iron oxide phases. The relative abundance of Pb in fine clay mineral phases suggested that these mineral phases were main Pb carriers in soils. This study demonstrates that TEM-EDX is an efficient method to investigate metal adsorption in the soil components. | |||
| TO cite this article:WANG siyuan,LU shenggao. TEM/EDX investigation on adsorption of Pb on soil mineral components[OL].[10 January 2013] http://en.paper.edu.cn/en_releasepaper/content/4510227 | |||
| 7. Transport and deposition of colloids in sand porous media under unfavorable chemical conditions | |||
| SHEN Chongyang,DU Yichun | |||
| Agronomy 13 December 2012 | |||
| Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
| Abstract:This study examines the morphology of colloid deposition onto rough surfaces under unfavorable conditions via theoretical analysis and laboratory experiments. Saturated column experiments were conducted with bacteria- and virus-sized latex particles and various collectors (sand and glass beads) at different ionic strengths and flow rates. A three-step procedure was used for colloid retention and release, following dissection of the columns to determine depth profiles of retained colloids. Results show that (i) colloids deposited in secondary minima mainly reside aside the asperities (up gradient of them with respect to flow direction) and these deposited colloids can be released by reduction of solution ionic strength but are relatively insusceptible to effect of hydrodynamics; (ii) colloids deposited in primary minima mainly reside atop the asperities and the deposited colloids cannot be released by changing solution ionic strength but are subjected to the influence of flow velocity; (iii) surface roughness not only favors colloid deposition in primary minimum via decreasing energy barrier but also increases secondary-minimum deposition because colloids associated with secondary minima can reside aside asperities and the asperities increase dominance of adhesive over hydrodynamic drag torques. Our study indicates that it is critical to combining mechanical (e.g., increase flow rate) and chemical (e.g., decrease solution ionic strength) methods for efficient particle removal, which is required in many industrial and environmental cleaning processes (e.g., cleaning of semiconductor surfaces and remediation of contaminated soil). | |||
| TO cite this article:SHEN Chongyang,DU Yichun. Transport and deposition of colloids in sand porous media under unfavorable chemical conditions[OL].[13 December 2012] http://en.paper.edu.cn/en_releasepaper/content/4503734 | |||
| 8. Effects of applying byproduct from flue gas desulfurization in batches on sodic soils quality and sunflower growth | |||
| Wang Jinman | |||
Agronomy 11 January 2010
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| Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
| Abstract:In order to study the application mode of By-product from Flue Gas Desulfurization (BFGD) used to reclaim sodic soils, the field plot experiment of sunflower was conducted to analyze effects of two application modes, applying BFGD in batches and applying BFGD only once, on the physical and chemical properties of two sodic soils (in sodic soil I, ESP=19.8; in sodic soil II, ESP=46.9) and the sunflower production. The results indicated that ESP and pH of the top 40cm soil decreased significantly, and germination rate, dry matter weight and sunflower production increased after applying BFGD in all the treatments. The soil EC in the top 40 cm soil appreciably increased in initial stage after applying BFGD. However, it was lower after two years than that in initial stage and soil EC was less than, or close to the value before the experiment. The mode of applying BFGD in batches was better than that of applying it only once because the mode of applying BFGD in batches could decrease the accumulation of soil salts and promote the dissolution of CaSO4 .The ESP of sodic soil I and sodic soil II reduced to 13.5 and 14.9 respectively, their pH reduced to 8 and 8.4 respectively, and sunflower production increased by 1630.80 kg昲m-2 and 1315.65 kg昲m-2 respectively in the most effective treatments of applying BFGD in batches. In contrast to the mode of applying BFGD only once, the soil pH decreased by 4.76% and 2.33% in sodic soil I and sodic soil II, ESP decreased by 8.78% and 24.75%, germination rate increased by 4.71% and 17.57% and sunflower production increased by 12.95% and 17.52%.If the drainage was in good condition and the byproduct was applied at right rate, the salts of soil top layer would not be accumulated. | |||
| TO cite this article:Wang Jinman. Effects of applying byproduct from flue gas desulfurization in batches on sodic soils quality and sunflower growth[OL].[11 January 2010] http://en.paper.edu.cn/en_releasepaper/content/38773 | |||
| 9. Shifts in microbial community under different fertilizers in a lab incubation | |||
| Zhang qichun,Guang-huo WANG | |||
| Agronomy 05 January 2010
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| Abstract:The effects of different fertilization treatments on paddy soil microbial communities were characterized using several techniques. Treatments included no fertilizer (NF), inorganic fertilizer only (CF), pig manure in combination with inorganic fertilizer (CFM) and straw manure in combination with inorganic fertilizer (CFS). Assessments included determination of microbial population counts by soil dilution plating on various general and selective culture media, microbial activity by community level physiological profiling using Biolog sole carbon source utilization tests (Biolog) and phospholipid fatty acid (PLFA) profiles. Soil populations with organic manure tended to have higher levels of culturable bacteria and fungi and lower levels of actinomycetes. Biolog plates indicated that the soil microbial metabolism quotient (AWCD), Shannon index and McIntonsh index all increased significantly in CFS- and CFM-treated soils relative to NF-treated soil. Soil phospholipid fatty acid (PLFA) analysis demonstrated the monounsaturated fatty acids 18:1ω9c, 18:1ω7c, 16:1ω7c, 16:1ω9c, 15:1ω6c and 18:2ω6,9c were most prevalent in CFM- and CFS-treated soils. The saturated straight chain lipids 14:0, 17:0, 18:0, 19:0 and 20:0 were most enriched in NF- and CF-treated soils. Fertilization increased the PLFA biomarkers for bacteria and fungi, but reduced the markers for actinomycetes. The ratio of Gram-positive to Gram-negative bacteria was significantly higher in the NF- and CF-treated soils relative to the CFS- and CFM-treated soils (P<0.05). However, further studies are required to understand how these changes in microbial community structure might actually impact soil microbial community function. | |||
| TO cite this article:Zhang qichun,Guang-huo WANG. Shifts in microbial community under different fertilizers in a lab incubation[OL].[ 5 January 2010] http://en.paper.edu.cn/en_releasepaper/content/38481 | |||
| 10. Effect of K Fertilization on Soil K Pools and Rice Response in an Intensive Cropping System in China | |||
| Zhang Qichun ,Wang Guanghuo,Feng Yuke | |||
| Agronomy 18 February 2009
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| Abstract:In order to assess the changes in soil K pools as affected by K fertilizer application and the impact of the changes on K balance, grain yield and K uptake, an experiment was conducted in Central Zhejiang Province, East China, in a continuous double-cropping rice system. Two sites were selected: 1) the Agricultural Research Institute of Jinhua (ARI) where soil is calcareous and 2) the Shimen Research Farm (SM) where soil is acidic. Eight consecutive crops were grown (1997 - 2000) in ARI and 5 consecutive crops (1998 - 2000) at SM. Treatments included unfertilized control (CK), and three different fertilizer treatments (NP, NK and NPK). Potassium extracted by ion exchange resin decreased from 26 mg kg-1 to 5 - 7 mg kg-1 after 8 consecutive season of growth at the ARI site. Addition of 100 kg K ha-1 for each rice crop was not enough to maintain initial K availability, especially in the calcareous soil at ARI site. In treatments with K, a small increase in readily available K was observed only in SM soil. The K extracted by HNO3 also decreased significantly in the treatments without K addition and was increased slightly in the treatments with K application. In the NP treatment, the decrease in HNO3-K was several times greater than Resin-K, indicating that non-exchangeable K may be the major source of K supply to rice. Soil K depletion was greater for hybrid rice than inbred rice, and this difference in K demand should be taken into account in developing fertilizer recommendations for irrigated rice. | |||
| TO cite this article:Zhang Qichun ,Wang Guanghuo,Feng Yuke . Effect of K Fertilization on Soil K Pools and Rice Response in an Intensive Cropping System in China[OL].[18 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29255 | |||
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