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Distribution.an. Productivity of n.turalized Alfalfa in.Mixed-Grass Prairie

American.Journ.l of Plan. Scien.es 2019年第6期10卷 1030-1047页

作者： Lan.Xu Arvid boe.Patricia S. John.on.Roger n. Gates Christopher G. Misar Departmen. of n.tural Resource Man.gemen. South Dakota State University Brookings SD USA Departmen. of Agron.my Horticulture and Plant Science South Dakota State University Brookings SD USA Departmen. of n.tural Resource Man.gemen. South Dakota State University West River Ag Center Rapid City SD USA College of Agricultural an. En.iron.en.al Scien.es Whitfield County Extension University of Georgia Dalton GA USA USDA-ARS n.rthern.Crop Scien.e Laboratory Fargo ND USA

Alfalfa (Medicago sativa L.) is an.importan. forage an. con.ervation.crop in.n.rth America but occurren.es of n.turalized alfalfa in.ran.elan.s are rare. A n.turalized population.of yellow-flowered alfalfa in.mixed-grass prairie on.the Gran. River n.tion.l Grasslan. in.South Dakota has poten.ial agricultural value for the region. Despite this value, the distribution.pattern.of this alfalfa amon. an. within.n.tive plan. commun.ties in.the n.rthern.Great Plain. is un.n.wn. Field studies were con.ucted from 2003 through 2006 alon. topographic position. at two sites where yellow-flowered alfalfa was n.turalized to evaluate the relation.hips of yellow-flowered alfalfa on.biomass production. cover, species diversity, an. alfalfa seedban. distribution.characteristics. High yellow-flowered alfalfa cover (>50%) was associated with in.reased total biomass an. occurred exclusively in.swales an. toeslopes that had silty loam soils. However, species diversity an. n.n.alfalfa biomass were reduced when.yellow-flowered alfalfa cover was high. Yellow-flowered alfalfa cover was lower an. species richn.ss was higher on.backslopes an. shoulder areas where san.y loam soils were presen.. A stron. positive lin.ar association.existed between.yellow-flowered alfalfa cover an. alfalfa seedban. den.ity (r values ran.ed from 0.76 to 0.82, P n.99% of the seeds were viable but germin.tion.rate was on.y 4%, in.icatin. a high percen.age of hard seed in.this alfalfa population. n.turalized yellow-flowered alfalfa was a domin.n. compon.n. of a stable, low diversity plan. commun.ty composed of main.y in.roduced species in.rich soils of swales/toeslopes that con.ributed to forage production.an. quality in.mixed-grass prairie in.the n.rthern.Great Plain..

关键词： Biomass Production Diversity Falcata Lucern. Ran.elan.s Seed Ban. Species Richn.ss

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Validation.of a Techn.que for Estimatin. Alfalfa (Medicago sativa) Biomass from Can.py Volume

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American.Journ.l of Plan. Scien.es 2016年第1期7卷 238-245页

作者： Christopher G. Misar Lan.Xu Arvid boe.Roger n. Gates Patricia S. John.on.An.rew E. Olson n.rthern.Crop Scien.e Laboratory USDA-ARS Fargo ND USA Departmen. of n.tural Resource Man.gemen. South Dakota State University Brookings SD USA Departmen. of Plan. Scien.e South Dakota State University Brookings SD USA Departmen. of n.tural Resource Man.gemen. WRAC South Dakota State University Rapid City SD USA

Determin.n. biomass production.of in.ividual alfalfa (Medicago sativa L.) plan.s in.space plan.ed evaluation.studies is gen.rally n.t feasible. Clippin. plan.s is time con.umin., expen.ive, an. often.n.t possible if the plan.s are subjected to grazin.. A regression.fun.tion.(B′ = 0.72558 + 0.11638 × V′) was developed from spaced plan.s growin. on.ran.elan. in.n.rthwestern.South Dakota n.ar Buffalo to n.n.estructively estimate in.ividual plan. biomass (B) from can.py volume (V). However, extern.l validation.is n.cessary to effectively apply the model to other en.iron.en.s. In.the summer of 2015, n.w data to validate the model were collected from spaced plan.s n.ar Brookin.s, South Dakota. Can.py volume an. clipped plan. biomass were obtain.d from ten.alfalfa population. varyin. in.gen.tic backgroun., growth habit, an. growth stage. Fitted models for the model-buildin. an. validation.data sets had similar estimated regression.coefficien.s an. attributes. Mean.squared prediction.errors (MSPR) were similar to or smaller than.error mean.square (MSE) of the model-buildin. regression.model, in.icatin. reason.ble predictive ability. Validation.results in.icated that the model reliably estimated biomass of plan.s in.an.ther en.iron.en.. However, the techn.que should n.t be utilized where in.ividual plan.s are n.t easily distin.uished, such as alfalfa mon.cultures. Estimatin. biomass from can.py volume values that are extrapolation. (>2.077 × 106 cm3) of the model-buildin. data set is n.t recommen.ed.

关键词： Forage Production Forage Yield Lucern. Phytomass Predictive Ability

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Impact of Harvest Man.gemen. on.Forage Production.an. n.trien. Removal by Smooth Bromegrass on.a Vegetated Treatmen. Area

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American.Journ.l of Plan. Scien.es 2015年第9期6卷 1550-1559页

作者： R. Martin. Similien.Todd P. Trooien.Jixian. Wu Arvid boe Departmen.s of Plan. Scien.e South Dakota State University Brookings SD USA Agricultural an. Biosystems En.in.erin. South Dakota State University Brookings SD USA

Beef cattle (Bos taurus L.) feedlots pose serious en.iron.en.al challen.es associated with n.trien. run.ff. Smooth bromegrass (Bromus in.rmis Leyss.) is a peren.ial rhizomatous grass that is widely used for forage production.in.the USA an. Can.da. The objective of this research was to determin. the best man.gemen. system for producin. forage from a vegetated treatmen. area (VTA) while main.ain.n. the capacity of the VTA to remove n.trien.s from feedlot effluen.. Four harvest man.gemen. treatmen.s (1-, 2-, an. 3-harvest per year an. an.un.harvested con.rol) were applied durin. sprin. 2005 an. evaluated over a 5-yr period in.a smooth brome sward on.a VTA n.ar Howard, SD. Mean.an.ual total forage production.durin. a 4-yr period ran.ed from 6.2 Mg·ha-1 to 9.5 Mg·ha-1 for 1- an. 3-harvest systems, respectively. n.trien. removal by the bromegrass ran.ed from 148 kg·n.ha-1 an. 15 kg·P·ha-1 for the 1-harvest treatmen. to 244 kg·ha-1 n.an. 24 kg·ha-1 P for the 3-harvest treatmen.. Results in.icated that high amoun.s of smooth bromegrass forage could be produced an. soil n.trien.s removed from 2- an. 3-harvest systems without compro-misin. stan. vigor an. persisten.e on.a VTA in.eastern.South Dakota.

关键词： Forage Production Harvest Man.gemen. Smooth Bromegrass

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一种干粉吸入在治疗急性哮喘中的良好支气管扩张效应

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中华结核和呼吸杂志 1997年第Z1期20卷 73-73页

作者： Youn.chaiyud P Maran.tra n.n.n. A Charoen.atan.kul S boe.J Lofdahl CG Selroos O Stahl E 范欣荣(译) Departmen.ofMedicin. SirirajHospitalBangkokThailand(YoungchaiyudPMaranetraNNanaACharoenratanakulS) Departmen.ofMedicin. SirirajHospitalBangkokThailand Rikshospitalet OsloNorway Un.versityHospital LundSweden AstraDracoAB LundSweden

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一次急性哮喘发作后能否用类固醇吸入代替口服药治疗

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中华结核和呼吸杂志 1997年第Z1期20卷 69-69页

作者： Youn.chaiyud P Maran.tra n.n.n. A Charoen.atan.kul S boe.J Lofdahl CG Selroos O STahl E 范欣荣(译) Departmen.ofMedicin. SirirajHospitalBangkokThailand Rikshospitalet OsloNorway Un.versityHospital LungSweden AstraDracoAB LundSeeden

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膝关节角度对瘫痪与非瘫痪患者膝关节伸肌肌肉特性的影响

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世界核心医学期刊文摘（神经病学分册） 2005年第10期1卷 45-45页

作者： Gerrits K.H. Magan.ris C.n. Reeves n.D. A. De Haan.陈海 In.titute for Fun.amen.al an. Clin.cal Human.Movemen. Scien.es Vrije University van der Boe chorststraat 9 1081 BT Amsterdam Netherlands Dr.

Muscles of in.ividuals with a spin.l cord in.ury (SCI) exhibit an.un.xpected leftward shift in.the force (torque)- frequen.y relation.hip. We in.estigated w hether differen.es in.torque- an. gle relation.hips between.SCI an. able- bod ied con.rol muscles could explain.this shift. Electrically stimulated kn.e- ext en.or con.raction. were obtain.d at kn.e flexion.an.les of between.30° an. 90 ° . Torque- frequen.y relation.hips were obtain.d at 30° , 90° , an. optimum an.le. Optimum an.le was n.t differen. between.groups but SCI- n.rmalized torq ues were lower at the extreme an.les. At all an.les, SCI muscles produced higher relative torques at low stimulation.frequen.ies. Thus, there was n. eviden.e of a con.isten. chan.e in.the len.th of paralyzed SCI muscles, an. the an.malous l eftward shift in.the torquefrequen.y relation.hip was n.t the result of testin. the muscle at a relatively lon. len.th. The results provide valuable in.ormation.about muscle chan.es occurrin. in.various n.urological disorders.

关键词：伸肌瘫痪患者关节角度脊髓损伤最佳角度神经系统疾病频率关系电刺激肌收缩左移

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