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Effect of slope position on leaf and fine root C,N and P stoichiometry and rhizosphere soil properties in Tectona grandis plantations

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林业研究:英文版 2023年第6期34卷 1997-2009页

作者： Qingqing Zhang Zaizhi Zhou Weiwei Zhao Guihua Huang Gaofeng Liu Xiaofei Li Junduo Wu Research Institute of Tropical Forestry Chinese Academy of ForestryGuangzhou 510520People’s Republic of China Experimental Center of Tropical Forestry Chinese Academy of ForestryPingxiang 532600People’s Republic of China

Little is known about C-N-P stoichiometries and content in teak(Tectona grandis)plantations in South China,which are mostly sited on hilly areas with lateritic soil,and the effect of slope position on the accumulation of these elements in trees and rhizosphere *** we analyzed the C,N,P content and stoichiometry in leaves,fine roots and rhizosphere soils of trees on the upper and lower slopes of a 12-year-old teak *** Kraft classification system of tree status was used to sample dominant,subdominant and mean trees at each slope *** results showed that the C,N and P contents in leaves were higher than in fine roots and rhizosphere *** lowest C/N,C/P and N/P ratios were found in rhizosphere soils,and the C/N and C/P ratios in fine roots were higher than in *** accumulation in leaves,fine roots and rhizosphere soils were significantly influenced by slope position and tree class with their interaction mainly showing a greater effect on rhizosphere *** C content and C/N ratio,fine root C and P contents,and C/N and C/P ratios all increased distinctly with declining slope *** contents of organic matter(SOM),ammonium(NH4+-N),nitrate-nitrogen(NO3--N)and available potassium(AK)in rhizosphere soils were mainly enriched on upper slopes,but exchange calcium(ECa),available phosphorus(AP),and pH were relatively *** in the C,N and P stoichiometries in trees were mainly attributed to the differences in rhizosphere soil properties.N and P contents showed significant positive linear relationships between leaf and rhizosphere soil,and C content negative linear correlation among leaves,fine roots and rhizosphere *** properties of rhizosphere soils,particularly C/N and NH4+-N,had significant effects on the leaf nutrients in trees on the upper ***,rhizosphere soil properties mainly influenced fine root nutrients on the lower slope,and soil AK was the major influencing ***,these

关键词： Tectona grandis Stoichiometric ratio rhizosphere soil Dominant trees Nutrient accumulation

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Nutrient coordination mechanism of tiger nut induced by rhizosphere soil nutrient variation in an arid area, China

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干旱区科学:英文版 2023年第10期15卷 1216-1230页

作者： TAN Jin WU Xiuqin LI Yaning SHI Jieyu LI Xu School of soil and Water Conservation Beijing Forestry UniversityBeijing 100083China

Tiger nut is a bioenergy crop planted in arid areas of northern China to supply oil and adjust the planting ***,in the western region of Inner Mongolia Autonomous Region,China,less water resources have resulted in a scarcity of available farmland,which has posed a huge obstacle to planting tiger *** of tiger nut on marginal land can effectively solve this *** fully unlock the production potential of tiger nut on marginal land,it is crucial for managers to have comprehensive information on the adaptive mechanism and nutrient requirement of tiger nut in different growth *** study aims to explore these key information from the perspective of nutrient coordination strategy of tiger nut in different growth periods and their relationship with rhizosphere soil *** fertilization treatments including no fertilization(N:P(nitrogen:phosphorous)=0:0),traditional fertilization(N:P=15:15),and additional N fertilizer(N:P=60:15)were implemented on marginal land in the Dengkou *** and soil samples were collected in three growth periods,including stolon tillering period,tuber expanding period,and tuber mature *** no fertilization,there was a significant correlation between N and P contents of tiger nut roots and tubers and the same nutrients in the rhizosphere soil(Prhizosphere soil prompts tiger nut to increase the C:N ratio,improving N utilizat

关键词： tiger nut stoichiometry rhizosphere soil nitrogen addition marginal land

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rhizosphere soil Fungal Diversity and soil Physicochemical Properties of Different Vegetations in Tundra of Changbai Mountain

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Journal of Geoscience and Environment Protection 2023年第2期11卷 13-29页

作者： Ran Hao Li Yang Yihui Wang Dalian Minzu University College of Environment and Bioresources Dalian China Dalian Huali Jingang Pharmaceutical Co. Ltd. Dalian China

By studying the diversity and community structure of rhizosphere soil fungi of different plants in the tundra on the northern slope of Changbai Mountain, it provides theoretical support for the restoration of environmental degradation and in-depth study of fungal diversity in the tundra of Changbai Mountain. High-throughput sequencing technology was used to determine the ITS1 region of fungal amplicons, so as to analyze the diversity of fungal communities in the rhizosphere soil of six plants in the tundra of Changbai Mountain, and to analyze the correlation between the environment and the diversity and richness of fungal communities in combination with relevant soil physical and chemical factors. The diversity and richness of fungal community in the rhizosphere soil of six plants in Changbai Mountain tundra were different. The Simpson and Shannon indexes of Saxifraga stolonifera Curt were the highest, and the richness of fungal community in Dryas octopetala was the highest. The analysis of fungal community composition showed that the fungal colonies in plant rhizosphere soil samples mainly belonged to Ascomycota and Basidiomycota, which were the main dominant phyla. Mortierella, Fusarium and Sordariomycetes are common fungal genera in the rhizosphere soil of six plants, but their abundances are different among different plants. Water content was negatively correlated with fungal diversity, and TP was positively correlated with fungal community diversity. There were some differences in the composition and diversity of rhizosphere soil fungal communities of six plants in Changbai Mountain tundra. Ascomycota and Basidiomycota were the main soil fungal phyla in the rhizosphere of six plants in Changbai Mountain tundra. The results could provide theoretical guidance for ecological protection of Changbai Mountain tundra.

关键词： Changbai Mountain rhizosphere soil Fungal Diversity soil Environmental Factors

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Effects of reduced nitrogen and suitable soil moisture on wheat(Triticum aestivum L.) rhizosphere soil microbiological,biochemical properties and yield in the Huanghuai Plain,China

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Journal of Integrative Agriculture 2020年第1期19卷 234-250页

作者： ZHOU Su-mei ZHANG Man ZHANG Ke-ke YANG Xi-wen HE De-xian YIN Jun WANG Chen-yang College of Agronomy Henan Agricultural UniversityZhengzhou 450002P.R.China Institute of Plant Nutrient and Environmental Resources Henan Academy of Agricultural SciencesZhengzhou 450002P.R.China

soil management practices affect rhizosphere microorganisms and enzyme activities, which in turn influence soil ecosystem processes. The objective of this study was to explore the effects of different nitrogen application rates on wheat(Triticum aestivum L.) rhizosphere soil microorganisms and enzyme activities, and their temporal variations in relation to soil fertility under supplemental irrigation conditions in a fluvo-aquic region. For this, we established a split-plot experiment for two consecutive years(2014–2015 and 2015–2016) in the field with three levels of soil moisture: water deficit to no irrigation(W1), medium irrigation to(70±5)% of soil relative moisture after jointing stage(W2), and adequate irrigation to(80±5)% of soil relative moisture after jointing stage(W3);and three levels of nitrogen: 0 kg ha^–1(N1), 195 kg ha^–1(N2) and 270 kg ha^–1(N3). Results showed that irrigation and nitrogen application significantly increased rhizosphere microorganisms and enzyme activities. soil microbiological properties showed different trends in response to N level;the highest values of bacteria, protease, catalase and phosphatase appeared in N2, while the highest levels of actinobacteria, fungi and urease were observed in N3. In addition, these items performed best under medium irrigation(W2) relative to W1 and W3;particularly the maximum microorganism(bacteria, actinobacteria and fungi) amounts appeared at W2, 5.37×10^7 and 6.35×10^7 CFUs g^–1 higher than those at W3 in 2014–2015 and 2015–2016, respectively;and these changes were similar in both growing seasons. Microbe-related parameters fluctuated over time but their seasonality did not hamper the irrigation and fertilization-induced effects. Further, the highest grain yields of 13 309.2 and 12 885.7 kg ha^–1 were both obtained at W2 N2 in 2014–2015 and 2015–2016, respectively. The selected properties, soil microorganisms and enzymes, were significantly correlated with wheat yield and proved to be valuable ind

关键词： suitable soil moisture nitrogen-reduction rhizosphere soil microorganisms rhizosphere soil enzyme activity winter wheat(Triticum aestivum L.)

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Nitrogen application and intercropping change microbial community diversity and physicochemical characteristics in mulberry and alfalfa rhizosphere soil

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Journal of Forestry Research 2021年第5期32卷 2121-2133页

作者： Xiuli Zhang Zhiyuan Teng Huihui Zhang Dunjiang Cai Jingyun Zhang Fanjuan Meng Guangyu Sun Key Laboratory of Saline-Alkali Vegetation Ecology Restoration(Northeast Forestry University) Ministry of EducationHarbin 150040People’s Republic of China College of Life Science Northeast Forestry UniversityHarbin 150040People’s Republic of China College of Resource&Environment Northeast Agricultural UniversityHarbin 150030People’s Republic of China Institute of Crop Development Heilongjiang Academy of Land Reclamation and Agricultural SciencesJiamusiHeilongjiangPeople’s Republic of China

Intercropping of mulberry(Morus alba L.)and alfalfa(Medicago sativa L.)is a new forestry-grass compound model in China,which can provide high forage yields with high *** application is one of the important factors determining the production and quality of this *** elucidate the advantages of intercropping and nitrogen application,we analyzed the changes of physicochemical properties,enzyme activities,and microbial communities in the rhizosphere *** used principal components analysis(PCA)and redundancy discriminators analysis to clarify the relationships among treatments and between treatments and environmental factors,*** results showed that nitrogen application significantly increased pH value,available nitrogen content,soil water content(SWC),and urea(URE)activity in rhizosphere soil of monoculture *** contrast,intercropping and intercropping+N significantly decreased pH and SWC in mulberry ***,intercropping and intercropping+N sharply reduced soil organic matter content and SWC in alfalfa ***,intercropping,and intercropping+N increased the values of McIntosh diversity(U),Simpson diversity(D),and Shannon-Weaver diversity(H’)in mulberry ***,PC A scatter plots showed clustering of monoculture mulberry with nitrogen(MNE)and intercropping mulberry without nitrogen(M0).Intercropping reduced both H’and D but nitrogen application showed no effect on diversity of microbial communities in *** were obvious differences in using the six types of carbon sources between mulberry and alfalfa *** and intercropping increased the numbers of sole carbon substrate in mulberry treatments where the relative use rate exceeded 4%.While the numbers declined in alfalfa with nitrogen and *** indicated that URE was positive when intercropping mulberry was treated with nitrogen,but was negative in monoculture alfalfa treated with *** pH and SWC were posi

关键词： Mulberry intercropped with alfalfa Nitrogen application Principal components analysis Redundancy discriminators analysis rhizosphere soil

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Research on Change of rhizosphere soil Properties of Chinese fir Plantation

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Chinese Forestry Science and Technology 2002年第4期1卷 18-26页

作者： YANG Chengdong JIAO Ruzhen SUN QiwuResearch Institute of Forestry. Chinese Academy of Forestry. Beijing 100091. China

This article emphatically reviews the difference of soil biological activities, biochemical activities and soil chemical properties between the rhizosphere and non-rhizosphere soil of first rotation of Chinese fir (Cunninghamia lanceolata (Lamb) Hook) plantation. It also reviews their dynamic patterns during Chinese fir plantation development. The results show that the contents of organic and inorganic nutrients in the rhizosphere soil of young, half-mature and near-mature Chinese fir of first-rotation ...

关键词： Chinese fir plantation rhizosphere soil non-rhizosphere soil soil properties

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rhizosphere and bulk soil enzyme activities in a Nothotsuga longibracteata forest in the Tianbaoyan National Nature Reserve,Fujian Province,China

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Journal of Forestry Research 2017年第3期28卷 521-528页

作者： Shihong Xiao Huiming You Weibin You Jinshan Liu Changtang Cai Jianqin Wu Zhirong Ji Shihua Zhan Zhesen Hu Zhongrui Zhang Dongjin He College of Forestry Fujian Agriculture and Forestry UniversityFuzhou 350002People's Republic of China Tianbaoyan National Nature Reserve Yong'an 366032People's Republic of China College of Computer and Information Science Fujian Agriculture and Forestry UniversityFuzhou 350002People's Republic of China College of Geographical Sciences Fujian Normal UniversityFuzhou 350007People's Republic of China

The rhizosphere, distinct from bulk soil, is defined as the volume of soil around living roots and influenced by root activities. We investigated protease, invertase, cellulase, urease, and acid phosphatase activities in rhizosphere and bulk soils of six Nothotsuga longibracteata forest communities within Tianbaoyan National Nature Reserve, including N. longibracteata ＋ either Phyllostachys pubescens, Schima superba, Rhododendron simiarum, Cunninghamia lanceolata, or Cyclobalanopsis glauca, and N. longibracteata pure forest. rhizosphere soils possessed higher protease, invertase, cellulase, urease, and acid phosphatase activities than bulk soils. The highest invertase, urease, and acid phosphatase activities were observed in rhizosphere samples of N. longibracteata ＋ S. superba. Protease was highest in the N. longibracteata ＋ R. simiarum rhizosphere, while cellulase was highest in the pure N. longibracteata forest rhizosphere. All samples exhibited obvious rhizosphere effects on enzyme activities with a significant linear correlation between acid phosphatase and cellulase activities （p 〈 0.05） in rhizosphere soils and between protease and acid phosphatase activities （p 〈 0.05） in bulk soils. A principal component analysis, correlating 13 soil chemical properties indices relevant to enzyme activities, showed that protease, invertase, acid phosphatase, total N, and cellulase were the most important variables impacting rhizosphere soil quality.

关键词： Bulk soil Enzyme activities rhizosphere soil Tianbaoyan National Nature Reserve Nothotsuga longibracteata

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STUDY ON SPATIAL AND TEMPORAL HETEROGENEITY PROPERTY OF ALLELOPATHIC EXPRESSION IN rhizosphere soil FROM DIFFERENT DRYLAND WINTER WHEAT CULTIVARS ON THE LOESS PLATEAU OF CHINA

STUDY ON SPATIAL AND TEMPORAL HETEROGENEITY PROPERTY OF ALLE...

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中国第三届植物化感作用学术研讨会、第八届全国杂草科学大会、联合国粮农组织——中国“水稻化感作用论坛”

作者： De-sheng WANG~1 Yong-qing MA ~(1,2*) Sheng-peng ZUO~2 1 College of Resources and Environment,Northwest A & F University,Shaanxi Yangling 712100, China 2 Institute of soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Shaanxi Yangling 712100,China

Through pot trials the characteristics of spatial and temporal heterogeneity of allelopathic potential from living roots amended in soil of four common winter wheat accessions on the Loess Plateau of China was conducted in four continuous growth periods based on bioassay of aqueous extracts from top soil(0 - 20 cm) as well as typical statistic *** was a

关键词： Triticum aestivum L. allelopathic expression rhizosphere soil spatial and temporal herterogeneity ecological management

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Isolation and identification of an antagonistic actinomycete from rhizosphere soil of tobacco

Isolation and identification of an antagonistic actinomycete...

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中国植物病理学会第十一届全国会员代表大会暨2018年学...

作者：陈奇园 Bian Chuanhong Chen Qianqian 康业斌 College of Forestry Henan University of Science and Technologe

From May to September 2014,the antagonistic actinomyces strain LA5 with a strong inhibition activity to Phytophthora parasitica was isolated from rhizosphere soil of tobacco in Luoning county of Luoyang,Henan *** strain were identified by using gram staining,observing the morphological characteristics by using oil immersion lens and cultural characteristic,determining physiological and biochemical characteristic,and analyzing the sequences of 16S *** research achievements as follows:(1) The Gram stain test showed that the strain LA5 is *** and straight spore chains were observed,rod-shaped spores and sporangia were found,and pear-shaped sporangia developed on the substrate mycelia under the light microscopy.(2) On the Gause No.1 medium,the strain LA5 produces ivory yellow substrate mycelia and snowwhite aerial mycelia,no soluble pigment.(3) The strain LA5 is positive for hydrolysis of starch,coagulation and peptonization of milk,liquefaction of gelatin,production of HS and negative for decomposition of *** show that this strain can produce amylase,protease,which does not produce cellulase.(4) The almost-complete 16S rDNA gene sequence of strain LA5 was determined and deposited in the GenBank databases as *** to Streptornyces lincolnensis were greater than 98%.Phylogenetic trees were constructed with the neighbour-joining algorithm using Molecular Evolutionary Genetics Analysis(MEGA) software version *** data suggest that strain LA5 should be Streptornyces lincolnensis.

关键词： Antagonistic actinomycetes Morphological identification Physiological and biochemical characteristics Molecular identification rhizosphere soil Tobacco

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Effect of barnyard grass under different densities on rhizosphere soil microorganism and related physic-chem characters in paddy

Effect of barnyard grass under different densities on rhizos...

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中国第二届植物化感作用学术研讨会暨中国植物保护学会植物...

作者： LI Haibo WANG Peng KONG Chuihua Institute of Applied Ecology Chinese Academy of Sciences Graduate School Chinese Academy of Sciences

Various microbial populations with TOC contents and pH values in the rhizosphere soil of barnyard grass under different densities were studied in paddy. The results showed that bacteria and actinomycetes are major microbes in the rhizosphere soil of barnyard grass. With the increasing density of barnyard grass, the numbers of bacteria fell down first and then increased, while the numbers of actinomycetes increased first, then fell down. However, fungi numbers always decreased with the increasing density of barnyard grass. Furthermore, the changes of TOC contents were similar with that of bacterial and that of pH values were similar with fungi. The results suggested that the effects of barnyard grass under different densities on rhizosphere soil microorganism were correlated with the metabolites from barnyard grass root exudates in paddy.

关键词： Barnyard grass rhizosphere soil Microorganisms TOC pH values Paddy

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