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Effect of N and P fertilization on the allocation and fixation of photosynthesized carbon in paddy soil

Ecosystem Health and Sustainability 2021年第1期7卷 289-299页

作者： Mostafa Zhran Tida Ge Yaoyao Tong Zhenke Zhu Yangwu Deng Ahmed Fahmy Ming Chen Tin Mar Lynn Jinshui Wu anna gunina School of Resources and Environmental Engineering Jiangxi University of Science and TechnologyGanzhouChina Key Laboratory of Agro-Ecological Processes in Subtropical Regions&Changsha Observation and Research Station for the Agricultural Environment Institute of Subtropical AgricultureChinese Academy of SciencesChangshaChina Soil&Water Research Department Atomic Energy AuthorityNuclear Research CenterAbou-ZaablEgypt Department of Environmental Chemistry University of KasselWitzenhausenGermany

Potted rice seedlings independently treated with N,P,and NP were continuously^(13)CO_(2) labeled to investigated the influence of N and P application on the contribution of photosynthesized C to the rhizosphere versus bulk soil and particulate organic matter(POM)versus mineral fraction(MIN).N and NP enhanced net assimilated^(13)C on day 14(D14),with maximum C assimilation occurring on day 22(D22)under *** biomass retained more^(13)C than belowground biomass for all treatments.^(13)C incorporation into the rhizosphere exceeded that in bulk soil,with the maximum(6-10%)found under N *** assimilated^(13)incorporated into POM increased in the rhizosphere under N and NP conditions,whereas MIN remained largely unaffected.^(13)C-MBC proportion in the total microbial biomass C(MBC)pool revealed that N and NP stimulated microbial activity to a greater degree than *** main portion of^(13)C in the rhizosphere and bulk soil was found in POM on D14,which decreased over time due to microbial ***,root-derived ^(13)C in the MIN remained unchanged between sampling days,which indicates that the stabilization of rhizodeposits in this fraction might be the potential mechanism underlying SOM sequestration in paddy soils.

关键词： Paddy soil ^(13)co_(2)continuous labeling fertilization carbon input rhizosphere bulk soil

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Fate of low-molecular-weight organic phosphorus compounds in the P-rich and P-poor paddy soils

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Journal of Integrative Agriculture 2021年第9期20卷 2526-2534页

作者： LI Bao-zhen anna gunina Mostafa ZHRAN Davey L.JONES Paul W.HILL HU Ya-jun GE Ti-da WU Jin-shui Key Laboratory of Agro-ecological Processes in Subtropical Region/Changsha Research Station for Agricultural&Environmental Monitoring Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125P.R.China Department of Environmental Chemistry University of KasselNordbahnhofstrae 1a 37213WitzenhausenGermany Department of Soil Biology and Biochemistry Dokuchaev Soil Science InstituteMoscow 119017Russian Federation Soil and Water Research Department Nuclear Research CenterAtomic Energy AuthorityAbou-Zaabl 13759Egypt School of Natural Sciences Bangor UniversityBangorGwynedd LL572UWUK University of Chinese Academy of Sciences Beijing 100049P.R.China

Continuous application of organic fertilizers can cause accumulation of organic phosphorus(P)in soil,especially in the lowmolecular-weight organic phosphorus(LMWOP)*** organic P pool represents a potentially important source of P for both plants and *** understand the effect of long-term fertilization(30 years)(P-rich soil)***(P-poor soil)on the bioavailability and fate of LMWOP in subtropical paddy soils,we determined the sorption and mineralization of 14 C-labeled adenosine,adenosine monophosphate(AMP),adenosine diphosphate(ADP),and adenosine triphosphate(ATP)in each *** contents of carbon,nitrogen,and P in the P-rich soil were more than two times greater than those in the P-poor *** mineralization rates of the LMWOP compounds were faster in the P-rich soil compared to the P-poor soil,and followed the order AMP>ADP>*** sterilized soil,all forms of adenosine-P were strongly sorbed to the solid phase and reached saturation in a short time,with the adsorbance increasing with the number of phosphate *** concluded that the mineralization of LMWOP compounds was repressed slightly by sorption to the solid phase,but only in the short ***,LMWOP compounds serve as readily available sources of C for microorganisms,making P available for themselves as well as for the ***,P accumulation and the progressive saturation of the P sorption sites in highly fertile soils may increase the potential risk of P runoff.

关键词： rice paddy phosphatase phosphorus cycling microbial community

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New approaches for evaluation of soil health, sensitivity and resistance to degradation

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Frontiers of Agricultural Science and Engineering 2020年第3期7卷 282-288页

作者： Yakov KUZYAKOV anna gunina Kazem ZAMANIAN Jing TIAN Yu LUO Xingliang XU anna YUDINA Humberto APONTE Hattan ALHARBI Lilit OVSEPYAN Irina KURGANOVA Tida GE Thomas GUILLAUME Department of Soil Science of Temperate Ecosystems Department of Agricultural Soil ScienceUniversity of Goettingen37077 GottingenGermany College of Food and Agriculture Sciences King Saud UniversityRiyadh 11451Saudi Arabia Department of Environmental Chemistry University of Kassel37213 WitzenhausenGermany College of Resources and Environmental Sciences National Academy of Agriculture Green DevelopmentKey Laboratory of Plant-Soil Interactions(Ministry of Education)China Agricultural UniversityBeijing 100193China Institute of Soil and Water Resources and Environmental Science Zhejiang Provincial Key Laboratory of Agricultural Resources and EnvironmentZhejiang UniversityHangzhou 310058China Institute of Geographic Sciences and Natural Resources Research Chinese Academy of SciencesBeijing 100101China CAS Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences(CAS)Beijing 100101China Department of Soil Physics and Hydrology V.V.Dokuchaev Soil Science InstituteMoscow 119017Russia Center for Research in Mycorrhiza and Agri-Environmental Sustainability(CIMYSA) University of La FronteraTemucoChile Institute of Physicochemical and Biological Problems in Soil Science Russian Academy of Sciences(RAS)Moscow 142290Russia State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture of China and Zhejiang ProvinceInstitute of Plant VirologyNingbo UniversityNingbo 315211China Laboratory of Biogeosciences Institute of Earth Surface DynamicsUniversity of LausanneCH-1015 LausanneSwitzerland

Assessment of soil health requires complexevaluation of properties and functions responsible for abroad range of ecosystem services. Numerous soil qualityindices (SQI) have been suggested for the evaluation ofspecific groups of soil functions, but comparison of variousSQI is impossible because they are based on a combinationof specific soil properties. To avoid this problem, wesuggest an SQI-area approach based on the comparison ofthe areas on a radar diagram of a combination of chemical,biological and physical properties. The new approach isindependent of the SQI principle and allows rapid andsimple comparison of parameter groups and soils. Anotherapproach analyzing the resistance and sensitivity ofproperties to degradation is suggested for a detailedevaluation of soil health. The resistance and sensitivityof soil properties are determined through comparison withthe decrease of soil organic carbon (SOC) as a universalparameter responsible for many functions. The SQI-areaand resistance/sensitivity approaches were tested based on quences after the ab and on ment of agricultural soils. Both the SQI-area and the resistance/sensitivity approaches areuseful for basic and applied research, and for decisionmakersto evaluate land-use practices and measure thedegree of soil degradation.

关键词： ecosystem stability land quality land degradation soil health soil management soil organic matter

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Straw and biochar strongly affect functional diversity of microbial metabolism in paddy soils

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Journal of Integrative Agriculture 2019年第7期18卷 1474-1485页

作者： YUAN Hong-zhao ZHU Zhen-ke WEI Xiao-meng LIU Shou-long PENG Pei-qin anna gunina SHEN Jian-lin Yakov Kuzyakov GE Ti-da WU Jin-shui WANG Jiu-rong Key Laboratory of Agro-ecological Processes in Subtropical Region/Changsha Research Station for Agricultural and Environmental Monitoring Institute of Subtropical AgricultureChinese Academy of SciencesChangsha 410125P.R.China College of Environmental Science and Engineering Central South University of Forestry and TechnologyChangsha 410004P.R. China Department of Soil Biology and Biochemistry Dokuchaev Soil Science InstituteMoscow 119017Russian Federation Department of Agricultural Soil Science University of GottingenGottingen 37077Germany Institute of Environmental Sciences Kazan Federal UniversityKazan 420049Russian Federation Agro-Technology Institute RUDN UniversityMoscow 117198Russian Federation

The application of straw and biochar is widely practiced for the improvement of soil ***,its impact on microbial functional profiles,particularly with regard to paddy soils,is not well *** aim of this study was to investigate the diversity of microbial carbon use patterns in paddy soils amended with straw or straw-derived biochar in a 3-year field experiment in fallow soil and at various development stages of a rice crop(i.e.,tillering and blooming).We applied the community level physiological profiling approach,with 15 substrates(sugars,carboxylic and amino acids,and phenolic acid).In general,straw application resulted in the greatest microbial functional diversity owing to the greater number of available C sources than in control or biochar *** amendment promoted the use of α-ketoglutaric acid,the mineralization of which was higher than that of any other *** component analyses indicated that microbial functional diversity in the biochar-amended soil was separated from those of the straw-amended and control *** analyses revealed that soil organic carbon content was the most important factor regulating the pattern of microbial carbon *** and nutrient uptake by rice plants modulated microbial functions in paddy soils and stimulated the microbial use of N-rich substances,such as amino ***,our results demonstrated that the functional diversity of microorganisms in organic amended paddy soils is affected by both physicochemical properties of amendment and plant growth stage.

关键词： carbon metabolism microbial functional diversity biochar amendment paddy soil MicroRespTM

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