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The microbial community,nutrient supply and crop yields differ along a potassium fertilizer gradient under wheat-maize double-cropping systems

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Journal of Integrative Agriculture 2024年第10期23卷 3592-3609页

作者： Zeli Li Fuli Fang Liang Wu Feng Gao Mingyang Li Benhang Li Kaidi Wu Xiaomin Hu Shuo Wang Zhanbo Wei Qi Chen Min Zhang Zhiguang Liu Shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection College of Resources andEnvironmentLinyi UniversityLinyi 276000China National Engineering Research Center for Efficient Utilization of Soil and Fertilizer resources College of Resources and theEnvironmentShandong Agricultural UniversityTai’an 271018China Key Laboratory of Crop Specific Fertilizer Ministry of Agriculture and Rural Affairs/Xinyangfeng Agricultural Technology Co.Ltd.Jingmen 448001China Institute of Applied Ecology Chinese Academy of SciencesShenyang 110000China

Soil microorganisms play critical roles in ecosystem ***,the relative impact of the potassium(K)fertilizer gradient on the microbial community in wheat-maize double-cropping systems remains *** this long-term field experiment(2008-2019),we researched bacterial and fungal diversity,composition,and community assemblage in the soil along a K fertilizer gradient in the wheat season(K0,no K fertilizer;K1,45 kg ha^(-1) K_(2)O;K_(2),90 kg ha^(-1)K_(2)O;K3,135 kg ha^(-1)K_(2)O)and in the maize season(K0,no K fertilizer;K_(1),150 kg ha^(-1) K_(2)O;K_(2),300 kg ha^(-1)K_(2)O;K_(3),450 kg ha^(-1)K_(2)O)using bacterial 16S rRNA and fungal internally transcribed spacer(ITS)*** observed that environmental variables,such as mean annual soil temperature(MAT)and precipitation,available K,ammonium,nitrate,and organic matter,impacted the soil bacterial and fungal communities,and their impacts varied with fertilizer treatments and crop ***,the relative abundance of bacteria involved in soil nutrient transformation(phylum Actinobacteria and class Alphaproteobacteria)in the wheat season was significantly increased compared to the maize season,and the optimal K fertilizer dosage(K2 treatment)boosted the relative bacterial abundance of soil nutrient transformation(genus Lactobacillus)and soil denitrification(phylum Proteobacteria)bacteria in the wheat *** abundance of the soil bacterial community promoting root growth and nutrient absorption(genus Herbaspirillum)in the maize season was improved compared to the wheat season,and the K2 treatment enhanced the bacterial abundance of soil nutrient transformation(genus MND1)and soil nitrogen cycling(genus Nitrospira)genera in the maize *** results indicated that the bacterial and fungal communities in the double-cropping system exhibited variable sensitivities and assembly mechanisms along a K fertilizer gradient,and microhabitats explained the largest amount of the variation in crop yields,a

关键词： potassium fertilizer gradient microbial community wheat-maize double cropping climate change yield

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Land use and landscape pattern change: a linkage to the construction of the Qinghai-Xizang Highway

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Journal of Geographical Sciences 2002年第3期12卷 253-265页

作者： YAN Jianzhong, ZHANG Yili, LIU Linshan, LIU Yanhua2, ZHENG Du (1. Inst. of Geographic Sciences and Natural resources Research, CAS, Beijing 100101, China 2. The Ministry of Science and Technology, Beijing 100101, China 3. college of resources and Enviro Inst. of Geographic Sciences and Natural resources Research CAS Beijing China college of resources andenvironment Southwest Agricultural University Chongqing China The Ministry of Science and Technology Beijing China

Based on digital land use data from 1995 to 2000 and road data, the land use and landscape changes of Golmud, Qumaleb and Zhidoi are studied on a macro-scale. Land use and landscape changes in highway buffer zones and city expansion are special subjects. A new formula is used to define the exact degree of dynamic land use. To adequately define land use and landscape pattern changes, the buffer zones, illustrating the changes at different distances from the road, are recognized with ArcGIS 8.1 software. Prominent changes took place in land use and landscape patterns from 1995 to 2000, and the area of built-up land increased by 323.8%. The comprehensive degree of dynamic land use is 2.25, and the degree of dynamic land use of built-up land is the highest, followed by cultivated land. Woodland has the lowest value. The used degree index of land resources declined by 38.8 from 1995 to 2000. Landscape changed dramatically which influenced ecological processes immensely. Different from the corridor effect of other traffic routes, the corridor effect of this section of road is not obvious and its “point” radiation effect can be easily seen. The expanding range of Golmud City is confined to a 3 km buffer, while for Wudaoliang, it is 1 km. No land use change happened in the Nanshankou buffer.

关键词： land use change comprehensive index of the degree of land use diagnostic index of landscape degree of dynamic land use Qinghai-Xizang Highway

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Climate change and its impacts on mountain glaciers during 1960–2017 in western China

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Journal of Arid Land 2019年第4期11卷 537-550页

作者： LIU Yinge WANG Ninglian ZHANG Junhui WANG Lingang Key Laboratory of Disaster Monitoring and Mechanism Simulating in Shaanxi Province College of Geography andEnvironmentBaoji University of Arts and ScienceBaoji721013China State Key Laboratory of Cryosphere Science Northwest Institute of Eco-Environment and ResourcesChinese Academy ofSciencesLanzhou730000China college of Urban and Environmental Science Northwest UniversityXi'an710127China

Mountain glaciers are highly sensitive to climate change. In this paper, we systematically analyzed and discussed the responses of glaciers to climate change during 1960–2017 in western China by the methods of least squares and correlation analysis. Results show that the maximum temperature, minimum temperature, average temperature, and precipitation significantly increased in western China at the rates of 0.32°C/10 a, 0.48°C/10 a, 0.39°C/10 a, and 11.20 mm/10 a, respectively. However, the wind speed, hours of sunshine, snowfall, and snowy days displayed decreasing trends at the rates of –0.53 m/(s·10 a), 3.72 h/10 a, –2.90 mm/10 a, and –0.10 d/10 a, respectively. The annual percentage of glacier area decreased by approximately 0.42%, and the average glacier area decreased by 2.76 km^2/a. Meanwhile, glacial shrinkages were greater in the Altay Mountains, Tanggula Mountains, and Qilian Mountains than in the other mountainous regions. Glacier accumulation decreased while melt volume increased at a rate of 2.7×10~4 m^3/a. The area of melt volume was 1.3 times that of the glacier accumulation area. The glacier mass balance(GMB) decreased substantially at a rate of –14.0 mm/a, whereas the equilibrium line altitude(ELA) showed an increasing trend at a rate of 0.5 mm/a. After 1997, the mass was smaller than –500.0 mm, indicating a huge loss in glaciers. Furthermore, relationships between ELA and GMB and various climatic factors were established. Temperature and precipitation demonstrated a significantly negative correlation, whereas wind speed and snowy days had significantly positive correlations with GMB. Snowy days also exhibited a remarkably negative correlation with ELA. The strong warming trend and less snowy days were thought to be the main factors leading to glacial melting, whereas the increase in precipitation, and reductions of sunshine hours and wind speed might slow glacial melting.

关键词： temperature precipitation climate trend glacier variation impacts western China

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同时测定无机离子的改良离子色谱法在河水和废水质量监控中的应用(英文)

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色谱 2012年第4期30卷 365-368页

作者： Nobutake NAKATANI Daisuke KOZAKI Kazuhiko TANAKA Department of Environmental and Symbiotic Science College of AgricultureFood andEnvironment SciencesRakuno Gakuen UniversityHokkaido 069-8501Japan Graduate School for International Development and Cooperation Hiroshima University

In this study,our recent work on advanced ion chromatographic methods for the simultaneous determination of inorganic ionic species such as common anions(SO2-4,Cl-and NO-3) and cations(Na+,NH+4,K+,Mg2+,and Ca2+),nutrients(phosphate and silicate) and hydrogen ion/alkalinity are summarized ***,the applications using these methods for monitoring environmental water quality are also *** the determination of common anions and cations with nutrients,the separation was successfully performed by a polymethacrylate-based weakly acidic cation-exchange column of TSKgel Super IC-A/C(Tosoh,150 mm×6.0 mm i.d.) and a mixture solution of 100 mmol/L ascorbic acid and 4 mmol/L 18-crown-6 as acidic eluent with dual detection of conductivity and *** the determination of hydrogen ion/alkalinity,the separation was conducted by TSKgel ODS-100Z column(Tosoh,150 mm×4.5 mm i.d.) modified with lithium dodecylsulfate and an eluent of 40 mmol/L LiCl/0.1 mmol/L lithium dodecylsulfate/0.05 mmol/L H2SO4 with conductivity *** differences of ion concentration between untreated and treated wastewater showed the variation of ionic species during biological treatment process in a sewage treatment *** and distribution of water-quality conditions were related to the bioavailability and human activity in *** these results,our advanced ion chromatographic methods have contributed significantly for water quality monitoring of environmental waters.

关键词： advanced ion chromatography anions and cations nutrients hydrogen ion/alkalinity river water wastewater water quality monitoring

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Highlights of the special issue on“Healthy Soil for Healthy Food”

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Frontiers of Agricultural Science and Engineering 2020年第3期7卷 233-235页

作者： Junling ZHANG Fusuo ZHANG National Academy of Agriculture Green Development College of Resources and Environmental SciencesChina Agricultural UniversityBeijingl00193China

Soil is essential to human life and society, as soil is crucial to agricultural production, climate mitigation, waterpurification and many other functions. Soil is also connected with human health and nutritional security. It is projectedthat by 2050 global population will be 50% greater than at present and the global demand for food will have *** the current challenges of combating soil degradation and decreasing land area for food production, securingglobal food production and producing healthy food is of paramount importance. Strategic soil management inagricultural systems is necessary to promote soil health to achieve a proper balance between food production andenvironment. Soil health goes far beyond soil science itself, and it requires multidisciplinary and cutting-edgeknowledge in biology, physics, chemistry and many other areas. This special issue focuses on the advances in ourunderstanding of soil health, particularly from the perspective of soil microbiome. A holistic view on soil healthassessment and proper management sustainable soil management is also included. The issue consists of 7 reviewsand 4 research articles covering a wide range of topics on the novel indicators, approaches for soil healthassessment, mitigation of soil pollutants, soil microbiome and plant health, strategies to improve soil health forsustainable soil management.

关键词： soil doubled sustainable

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A highly efficient Mo2C hydrogen-evolution electrocatalyst with 3D hierarchical nano structure

A highly efficient Mo2C hydrogen-evolution electrocatalyst w...

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中国化学会第八届全国配位化学会议

作者： Jing Li Jianshuai Mu En-Cui Yang Xiao-Jun Zhao college of Chemistry Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry Ministry of Education Tianjin Key Laboratory of Structure and Performance for Functional Molecules Tianjin Normal University

The development of non-precious metal based electrocatalysts for hydrogen evolution reaction(HER)has received more and more attention over recent years owing to the energy andenvironment issues,and Mo based materials have been explored as a promising *** this work,MoN nanoparticles and MoC with 3D hierarchical nanostructures assembled by interconnected nanoflakes were synthesized facilely via one-step high-temperature pyrolysis by adjusting the mass ratio of urea and ammonium *** MoC 3D hierarchical nanomaterials consisted of unltrasmall nanoparticles encapsulated by carbon,which owned high specific surface *** all exhibited efficient HER activity,and the MoC electrocatalyst with the mass ratio of 160(MoC-160)showed the best HER activity,with a small overpotential of 90 mVto reach 10 mA cm and a small Tafel slope of 50 mV dec,which was one of the most active reported MoC-based electrocatalysts.

关键词： Mo2C 3D hierarchical nanostructures hydrogen evolution reaction nonnoblemetalelectrocatalyst

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