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Arbuscular mycorrhizal fungi reduce ammonia emissions under different land-use types in agro-pastoral areas

Pedosphere 2024年第2期34卷 497-507页

作者： Huaisong WANG Rui guo Yibo TIAN Nan CUI Xinxin WANG Lei WANG Zhongbao YANG Shuying LI jixun guo Lianxuan SHI Tao ZHANG Institute of Grassland Science Northeast Normal UniversityKey Laboratory of Vegetation EcologyMinistry of EducationJilin Songnen Grassland Ecosystem National Observation and Research StationChangchun 130024China Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural SciencesKey Laboratory of Dryland AgricultureMinistry of AgricultureBeijing 100081China Mountainous Area Research Institute of Hebei Province Hebei Agricultural UniversityBaoding 071001China College of Agronomy Liaocheng UniversityLiaocheng 252059China The Key Laboratory of Plant Development and Environmental Adaptation Biology Ministry of EducationSchool of Life ScienceShandong UniversityQingdao 266237China Forestry and Grassland Bureau of Aohan Banner Chifeng 024005China

Ammonia(NH3)emissions,the most important nitrogen(N)loss form,always induce a series of environmental problems such as increased frequency of regional haze pollution,accelerated N deposition,and N *** mycorrhizal(AM)fungi play key roles in N ***,it is still unclear whether AM fungi can alleviate N losses by reducing *** potential mechanisms by which AM fungi reduce NH_(3)emissions in five land-use types(grazed grassland,mowed grassland,fenced grassland,artificial alfalfa grassland,and cropland)were explored in this *** showed that AM fungal inoculation significantly reduced NH3emissions,and the mycorrhizal responses of NH3emissions were determined by land-use *** equation modeling(SEM)showed that AM fungi and land-use type directly affected NH_(3)*** addition,the reduction in NH_(3)emissions was largely driven by the decline in soil NH_(4)^(+)-N and pH and the increases in abundances of ammonia-oxidizing archaea(AOA)amoA and bacteria(AOB)amoB genes,urease activity,and plant N uptake induced by AM fungal inoculation and land-use *** present results highlight that reducing the negative influence of agricultural intensification caused by land-use type changes on AM fungi should be considered to reduce N losses in agriculture and grassland ecosystems.

关键词： agricultural intensification grassland management functional genes plant N uptake N leaching N loss

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The contribution of root respiration to soil CO_2 efflux in Puccinellia tenuiflora dominated community in a semi-arid meadow steppe

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Chinese Science Bulletin 2006年第6期51卷 697-703页

作者： WANG Wei guo jixun School of Urban and Environmental Sciences Northeast Normal University Changchun 130024 China Key Laboratory for Vegetation Ecology of the Ministry of Education Northeast Normal University Changchun 130024 China

In this study, the linear regression between soil respiration rate and root biomass was adopted to estimate the contribution of root respiration to total soil respiration in Puccinellia tenuiftora dominated community of a semi-arid meadow steppe in northeast China. The soil respiration rate reached the maximum value 2.45 μmol m-2·s-1 in late June and the minimum value 0.39 μmol m-2· s-1 in late September. Soil temperature is the major environmental factor controlling the seasonal variation of soil respiration. The root biomass ranged from 0.54 to 0.97 kg m-2, showing insignificant seasonal variation. Microbial biomass C reached the maximum value 0.50 g m-2 in mid August, presenting the least within-site variation. The pattern of seasonal change in root respiration rate was different from that in microbial respiration. Root respiration rate ranged from 0.19 μmol m-2·s-1 in May, to the maximum value 1.39 μmol m·2s-1 in late June, then down to 0.28 μmol m-2·s-1 in late September; whereas, microbial respiration rate ranged from 0.61 μmol m-2·s-1 in May, to the maximum value 1.27 μmol m-2·s-1 in July, then down to 0.11 μmol m-2·s-1 in late September. There was a significant exponential correlation between microbial respiration rate and soil temperature, whereas not so for root respiration rate. We estimated that the contribution of root respiration tototal soil respiration ranged within 24% -57% in spring and summer, and increased to 73% in autumn.

关键词：半干旱草甸草原根呼吸作用微生物量二氧化碳土壤

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Mycorrhizal colonization of chenopods and its influencing factors in different saline habitats, China

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Journal of Arid Land 2017年第1期9卷 143-152页

作者： ZHAO Yinan YU Hongqing ZHANG Tao guo jixun Institute of Grassland Science Northeast Normal University Key Laboratory of Vegetation Ecology Ministry of EducationChangchun 130024 China

Chenopodiaceae is one of the most important families in arid and saline environments. Several studies have observed the mycorrhizal structure in Chenopodiaceae plants（i.e., chenopods）, but the mycorrhizal colonization status of chenopods in saline habitats and the influencing factors are still not well understood. The mycorrhizal colonization of twenty chenopod species in three different saline habitats（a saline alkaline meadow in the Songnen Plain of northeastern China, a saline desert in the Junggar Basin of northwestern China, and a saline alpine meadow in the Tibetan Plateau of western China） and the chenopod-associated environmental factors（including soil moisture, soil available phosphorous（P） concentration, pH, and salt content） were analyzed. Our results showed that approximately 60% of the studied chenopods were colonized by arbuscular mycorrhizal（AM） fungi with a colonization percentage ranging from 5% to 33%. Structural analysis of mycorrhizal association indicated that vesicles were quite common, while arbuscules and hyphal coils were relatively rare. In addition, a positive correlation between mycorrhizal colonization rate and soil electrical conductivity（r=0.920, P〈0.01） and two negative correlations of mycorrhizal colonization rates with soil moisture（r= –0.818, P〈0.01） and the soil available P concentration（r= –0.876, P〈0.01） confirmed that mycorrhizal colonization rate in the roots of chenopods was environment-dependent.

关键词： adaptation arbuscular mycorrhizal fungi Chenopodiaceae salinization restoration

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Responses of Phytolith in Guinea Grass(Leymus chinensis) Leaves to Simulated Warming,Nitrogen Deposition and Elevated CO_2 Concentration in Songnen Grassland,Northeast China

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Chinese Geographical Science 2015年第4期25卷 404-413页

作者： LI Bo FENG Yingying guo jixun JIE Dongmei SHI Lianxuan Key Laboratory for Vegetation Ecology Ministry of Education Grassland Research Institute College of Life Science Northeast Normal University Key Laboratory for Wetland Ecology and Vegetation Restoration Ministry of Environmental Protection College of Geographical Science Northeast Normal University

Deposited in plant cells and their intercellular space,phytoliths,a special form of silica,could be used to determine information on plant structure and physiology especially their size and *** the hypothesis that phytolith in plant would change under variable climate and environment,the dominant plant species in Songnen grassland,guinea grass(Leymus chinensis),was treated by an open-top chamber(OTC) to elevate CO2 concentration,infrared heaters,and artificial nitrogen(N) addition for three years from 2006–*** were extracted by wet-ashing method and analyzed by variance analysis and so *** found that the responses to elevated CO2 are complicated,and warming is positive while N addition is negative to the deposition of phytoliths in *** ***,warming could reduce the negative impact of N addition on phytolith in *** short cell's taxonomic in graminea is significant because of no disappearance with simulated environmental *** phytolith originated in the long cell and plant intercellular space are more sensitive to elevated CO2 concentration,warming,and N addition,and could become some new indicators for environmental *** conclusion,different phytolith types have various responses to simulated warming,N addition and elevated CO2 concentration.

关键词： phytolith elevated CO2 warming N addition response

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Response of phytoliths in Leymus chinensis to the simulation of elevated global CO_2 concentrations in Songnen Grassland,China

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Chinese Science Bulletin 2010年第32期55卷 3703-3708页

作者： GE Yong JIE DongMei guo jixun LIU HongMei SHI LianXuan School of Urban and Environmental Science Northeast Normal University Changchun 130024 China Key Laboratory of Vegetation Ecology Ministry of Education Grassland Research Institute School of Life Science Northeast Normal University Changchun 130024 China

Measuring the response of terrestrial ecosystems to elevated CO2 concentrations is very important for understanding the effects of global change. In this study,OTC (open top chambers) were used to simulate elevated CO2 concentrations in the Songnen Grass-land. As well,phytoliths in Leymus chinensis were extracted to study the relationships between phytoliths and CO2 concentration. The results show the rondel is abundant in Leymus chinensis,while the trapeziform polylobate is rare. When phytolith production is increased,the rondel phytoliths grow bigger and the proportions of the different phytolith types changes under high CO2 concentration. These types include elongate hollow,acicular hair cell,square and laminate and are only observed in samples grown under high CO2 concentrations. All this evidence demonstrates that phytoliths in Leymus chinensis are sensitive to CO2 concentration,and indicate that phytolith analysis may have potential use in the study of global change,identifying different ecotypes of Leymus chinensis and for the reconstruction of paleoatmospheric CO2 concentrations.

关键词：二氧化碳浓度升高植物硅酸体羊草松嫩草原 CO2浓度升高仿真中国陆地生态系统

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松嫩草甸不同退化程度生境土壤磷素动态研究

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应用与环境生物学报 2006年第6期12卷 777-782页

作者：张乃莉郭继勋中国科学院植物研究所北京100093 东北师范大学草地研究所长春130024

对松嫩草甸不同退化程度生境的几种代表植物群落土壤磷索状况的研究表明，各群落相同土层的全磷含量没有显著的差异，说明土壤磷库具有较强的弹性，土壤退化落后于地上植物群落的退化．各群落土壤全磷的季节变化相似，均经历迅速累积，... 详细信息

对松嫩草甸不同退化程度生境的几种代表植物群落土壤磷索状况的研究表明，各群落相同土层的全磷含量没有显著的差异，说明土壤磷库具有较强的弹性，土壤退化落后于地上植物群落的退化．各群落土壤全磷的季节变化相似，均经历迅速累积，达到峰值后下降，之后又有一个缓慢积累的过程．羊草、寸草苔和碱茅群落全磷含量随土层的加深而减少，虎尾草群落土壤全磷聚集于10—20cm土层．随退化程度的加重，土壤速效磷含量增加，虎尾草群落土壤速效磷占全磷的比重最高（2．8％），表明退化生境植物群落对速效磷素的利用并不充分．各群落土壤微生物量磷含量均高于速效磷含量，其季节动态均为单峰曲线，峰值出现在8月．虎尾草群落土壤微生物量磷在10-20cm的土层最多，其他群落土壤微生物量磷在0—10cm土层的含量最多．灰色分析的结果表明，土壤速效磷的形成主要受到土壤养分，尤其是碳、氮养分的影响；而土壤温度、水分状况、酸碱状况和盐化程度等因素对土壤微生物量磷的影响较强．

关键词：速效磷微生物量磷土壤因子灰色关联分析

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Energy flow between litter of Puccinellia tenuiflora community and soil microorganisms in Songnen Grassland in Northeast China

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Progress in Natural Science:Materials International 2002年第2期 71-74页

作者： WANG Wei and guo jixun( Department of Environmental Science Grassland Research Institute, Northeast Normal University, Changchun 130024, China) Department of Environmental Science Grassland Research Institute Northeast Normal University Changchun 130024 China

The energy flow process between litter of Puccinellia tenuiflora community and soil microorganisms has been studied and a compartment model established to discuss the characteristics and function of microorganism during decomposing litter. The results show that during the process of energy flow through microorganism, the energy input is 1357.84 kJ·m-2·a-1 ; the energy absorbed by microorganism is 733. 97 kJ·m-2·a-1 , in which up to 552. 29 kJ·m-2·a-1 energy is consumed for respiration and the energy about 181. 23 kJ·m-2·a-1 is formed for microorganism biomass. 95 % of the litter accumulated on the ground annually would be decomposed in 1. 85 years and the decomposition index is 1.93. The mathematical model of the energy x 1 (t ) absorbed by microorganism of the year was described as x1( t) = 733. 97 - 0. 82e-1.85t and the model of the energy x2(t) formed for microorganism biomass of the year is expressed as x2(t) =181.23-0.37e-1.85t + 0.005e-4.05t. The equilibrium state of the energy absorbed by

关键词： Puccinellia tenuiflora community litter soil microorganism energy flow.

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松嫩平原羊草草场中羊草枯枝落叶形成过程的初步研究

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生态学杂志 1990年第1期9卷 11-14页

作者：郭继勋东北师范大学草地研究所

枯枝落叶是草原生态系统中净第一性产量的一个重要组成部分。植物光合作用的产物,其中大部分以枯枝落叶的形式贮存在地面,是一个巨大的物质库。它对调节物质循环,维持草原生态平衡起着重要的作用。

关键词：羊草枯枝落叶草原生态系统

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松嫩平原羊草草地土壤-植物间微量元素锰的时空动态

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东北林业大学学报 2008年第5期36卷 36-38页

作者：周晓梅郭继勋李玉吉林师范大学四平136000 植被生态科学教育部重点实验室(东北师范大学)

对羊草草地在土壤-植物间微量元素锰的动态进行了研究。结果表明:土壤中全锰、有效锰和羊草中锰含量很低。在生长季各时期,全锰和有效锰在土壤剖面从上至下呈下降趋势,有效锰与有机质呈显著正相关,而与pH值呈显著负相关。全锰各月平均... 详细信息

对羊草草地在土壤-植物间微量元素锰的动态进行了研究。结果表明:土壤中全锰、有效锰和羊草中锰含量很低。在生长季各时期,全锰和有效锰在土壤剖面从上至下呈下降趋势,有效锰与有机质呈显著正相关,而与pH值呈显著负相关。全锰各月平均含量变化在生长季呈"V"型曲线,7月含量最低;有效锰平均含量在5月—8月与全锰相似,8月后则逐渐减少。羊草各器官及枯落物锰含量有很大变化,总的趋势是:根>根茎>枯落物>叶>茎;羊草叶的锰含量在生长季中为波动型下降曲线,根茎、根、茎及枯落物的锰含量在生长季中为"V"型曲线。A层土壤富集有效锰的能力较强。土壤中锰活性平均为13.78%,从5月—8月逐渐升高,8月后逐渐下降,10月最低。羊草根部富集的锰平均为土壤有效锰的1.448倍。地下部的锰向地上部的转移强度从5月至10月逐渐下降,平均为0.556。地上部锰向枯落物的转移强度很高,平均为1.398,5月至10月逐渐升高。

关键词：羊草草地土壤全锰有效锰

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全球气候变暖对凋落物分解的影响

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生态学报 2014年第6期34卷 1327-1339页

作者：宋飘张乃莉马克平郭继勋中国科学院植物研究所植被与环境变化国家重点实验室北京100093 东北师范大学长春130024

凋落物分解作为生态系统核心过程,参与生态系统碳的周转与循环,影响生态系统碳的收支平衡,调控生态系统对全球气候变暖的反馈结果。全球气候变暖通过环境因素、凋落物数量和质量以及分解者3个方面,直接或间接地作用于凋落物分解过程,并... 详细信息

凋落物分解作为生态系统核心过程,参与生态系统碳的周转与循环,影响生态系统碳的收支平衡,调控生态系统对全球气候变暖的反馈结果。全球气候变暖通过环境因素、凋落物数量和质量以及分解者3个方面,直接或间接地作用于凋落物分解过程,并进一步影响土壤养分周转和碳库动态。气候变暖可通过升高温度和改变实际蒸散量等环境因素直接作用于凋落物分解。气候变暖可引起植物物种短期内碳、氮和木质素等化学性质的改变以及群落中物种组成的长期变化从而改变凋落物质量。在凋落物分解过程中,土壤分解者亚系统作为主要生命组分(土壤动物和微生物)彼此相互作用、相互协调共同参与调节凋落物的分解过程。凋落物分解可以通过改变土壤微生物量、微生物活动和群落结构来加快微生物养分的固定或矿化,以形成新的养分利用模式来改变土壤有机质从而对气候变化做出响应。未来凋落物分解的研究方向应基于大尺度跨区域分解实验和长期实验,关注多个因子交互影响下,分解过程中碳、氮养分释放、地上/地下凋落物分解生物学过程与联系、分解者亚系统营养级联效应等方面。

关键词：全球气候变暖凋落物分解土壤碳库

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