Study on Evapotranspiration Regularity of 3 Forages in Eastern Qinghai Province

The transpiration rate and transpiration quantity＇of whole plants and foliages of Bromus innerrnis, Medicago sativa and Agropyron cristatum are measured by using improved quick and continuous weighting after being cut off method （QCWC）. The results show that transpiration rate of branches and foliages of Agropyron cristatum is highest in 3 forages, Medicago sativa is second and Bromus innermis is lowest. From July to September, the average transpiration quantity of whole plants and foliages of 3 forages is highest in August, September is second and July is lowest.

THE CRUSTAL STRUCTURE BENEATH THE EASTERN QINGHAI

A Sino\|French joint wide\|angle seismic reflection survey was conducted in eastern Qinghai Province of P. R. China in 1998. There are several geological units in this region, including Sanjiang Fold belt, Bayan Har fold belt, eastern Kunkun fold belt, western Qingling fold belt, Qaidam basin and Qilian fold belt. The seismic data acquired in the seismic experiment provides an abundant information and reveals the detailed crustal velocity structure and differences between all the tectonic units in this region. These results will help us to understand the evolution procedure and mechanism of the formation of Qinghai—Xizang plateau.According to the seismic data, several reflection phases were identified. After the phase correlation, the reflectivity method and Dynamic Ray Tracing were applied simultaneously to model the 1\|D velocity structure for different tectonic units, actually to determine the velocity distribution within the crust. Based on the 1\|D depth\|velocity function, keeping the layer\|velocities fixed and only adjusting the shape of the reflectors to fit the observed data by Dynamic Ray Tracing, the 2\|D crustal velocity structures were established for each tectonic unit. The results show that there are some obvious differences between Sanjiang and Bayan Har. The crust is about 76km thick with an average velocity of 6 33km/s in Sanjiang region, but about 64km with an average velocity of 6 26km/s in Bayan Har. On the other hand, the velocity of lower crust in Sanjian is lower (about 6 65km/s) than in Bayan Har (about 6 90km/s), and the thickness of the lower crust in Sanjiang is much thicker than in Bayan Har. A low velocity layer ( v p=5 80～5 85km/s) exists on both sides of Jinsha fault. These evidences indicate the existence of Jinsha suture.

Isotopic characteristics of shoshonitic rocks in eastern Qinghai-Tibet Plateau: Petrogenesis and its tectonic implication

The Cenozoic magmatic rocks of shoshonitic series in the eastern Qinghai-Tibet Plateau include potassic alkaline plutonic rocks, volcanic rocks, lamprophyres and acidic porphyries. Analytical results show that these different lithological rocks are extremely similar in Sr, Nd and Pb isotopic compositions with the range of 0.705 187-0.707 254 for 87Sr/86Sr, 0.512 305-0.512 630 for 143Nd/144Nd, 18.53-18.97 for 206Pb/204Pb, 15.51-15.72 for 207Pb/204Pb and 38.38-39.24 for 208Pb/204Pb. They are isotopically similar to the EMU end-member. This indicates that mantle metasomatism must have taken place in their source region. The formation of these particular rocks is related to crustal thinning and mantle upwelling in a large-scale strike-slip and pull-apart fault zone at about 40 Ma in northern and eastern Qinghai-Tibet Plateau.

Temporal and Spatial Variations of ET 0 and Sensitivity Coefficients in Spring-summer in Eastern Agricultural Areas of Qinghai,China

Reference crop evapotranspiration(ET 0) is a key parameter to calculate crop water requirements.In the paper,ET 0 during 1960-2005 was calculated with FAO-56 PM in eastern agricultural areas of Qinghai,China.Then the sensitivity coefficients of ET 0 to meteorological variables were estimated through the nondimensional partial derivative in FAO-56 PM.Results show that the mean annual ET 0 of the whole area is 904 mm,and ET 0 portrays a very significant decrease during the 46 years.In spatial,ET 0 decreases from southeast to northwest,firstly increases then decreases from southwest to northeast.Through sensitivity analysis,in spring the most sensitive variable is relative humidity,while in summer is temperature.The temperature,sunshine duration and wind speed sensitivity coefficients(S(TA),S(n),S(u)) are higher in middle areas as opposed to surrounding areas,while the relative humidity sensitivity coefficient(S(RH)) has an opposite distribution rule.

Episodes of Cenozoic Gold Mineralization on the Eastern Margin of the Qinghai-Tibet Plateau:40Ar/39Ar Dating and Implication for Geodynamic Events

A lot of new gold deposits have been found on the eastern margin of the Qinghai-Tibet Plateau during the past two decades. Among them, three main types of gold deposits have been recognized, including quartz-vein-type, shear- zone-type and porphyry-type. The former two types of gold deposits are mainly hosted within metamorphic rocks, while the latter is related to Cenozoic magmatism. Although all of these gold deposits are believed to have been formed during the uplift process of the Qinghai-Tibet Plateau in the Cenozoic era (Wang et al., 2002b), precise isotopic age constraints have still been lacking until quite recently. This paper presents new 40Ar/39Ar data of some gold deposits on the eastern margin of the Qinghai-Tibet Plateau, which indicate that gold mineralization in the region occurred in response to the episodic stages of the orogenies. Recently obtained 40Ar/39Ar data on quartz and feldspars from several gold deposits, such as the Sandiao deposit, the Baijintaizi deposit, the Pusagang deposits, provide new constraints on gold mineralization on the eastern margin of the Qinghai-Tibet Plateau. Geochronological studies of gold deposits along the Daduhe River indicate that there are three stages of gold mineralization. The early two stages occurred as early as 65.1 Ma in the Shuibaiyang deposit and 58.95 Ma in the Ruoji deposit, while the latter stage occurred as late as 25.35 Ma in Baijintaizi and 24.70 Ma in Sandiao. Isotopic dating of three plagioclases from the Beiya deposit, Zhifanggou deposit and Luobodi deposit and a K-feldspar from the Jinchangqing deposit in Yunnan Province indicates that these deposits were formed at two stages. The Zhifanggou and Jinchangqing deposits have early stage records as old as 58.82 Ma in Zhifanggou and 55.49 Ma in Jinchangqing, but all of the above four deposits in Yunnan have late stage records of 23.18 Ma in Jinchangqing, 24.54 Ma in Zhifanggou, 24.60 Ma in Luobodi and 24.56 Ma in Hongnitang. The above results suggest that the gold deposits on the eastern margin of the Qinghai-Tibet Plateau were formed concentratedly at two main episodes, i.e. the end of the Paleocene (about 58 Ma) and the boundary between the Paleogene and the Neogene (about 25 Ma). The later episode appears to be looks like more important and was coupled with the Sichuan movement, which was extensively activated at that period. The beginning of the Cenozoic Era (about 65 Ma) might be another episode of gold mineralization, but only one deposit (Shuibaiyang) in this study has been proved to have been be formed at this stage and might be earlier than the initial collision between the Indian Plate and the Eurasia Plate. In view of geology, the above three episodes of gold mineralization are associated with three events of tectonic- magmatism and/or fluid events. Even though the gold deposits (for example, the Shuibaiyang deposit, Ruoji deposit and Pusagang deposit) were formed at different episodes, all of them are genetically related to tectonic movements in large- scale shear zones. It looks like theat tectonic events (including large-scale strike-slip) between Paleogene and Neogene had a wide influence upon gold mineralization, with new deposits formed and old deposits enriched or superimposed to be a higher grade by new stage of mineralization. The above data suggest that gold deposits were not only concentrated in some areas, but also formed mainly at different boundaries of geological times, indicating that there existed some peak stages of gold mineralization (metallogenic episodes), and that the gold deposits were formed mainly by episodic mineralization.

Discovery of Jinning Cycle Magmatism in Eastern Part of Eastern Kunlun Orogenic Belt and Its Significance

From the isotopic dating study of gneissic granodiorite, the authors discovered magmatism of the Jinning cycle. Intrusive rocks were formed in the Neoproterozoic, whose Pb Pb ages range from (913±4) Ma to (1 011±4) Ma and U Pb concordia age is (703±15) Ma. The tectonic settings of the rocks are volcanic arc or syn collision. After the formation of the intrusive rocks, these rocks also experienced reconstruction of Caledonian metamorphism. Based on the Ar Ar dating of metamorphic mineral of muscovite, the metamorphic time is determined to range from (386.8±0.8) Ma to (389.44±3.70) Ma.

Analysis of Outdoor Cultivation of Pepino(Solanum muricatum)in Qinghai Province

[Objectives]This study was conducted to explore the feasibility of planting pepino(Solanum muricatum Ait.)in Qinghai Province,and to understand the cultivation quality and yield in various areas of Qinghai.[Methods]With small fruit type of pepino as the material,four areas in eastern Qinghai were selected to determine the agronomic traits,yield and quality indexes of pepino.[Results]Under the same cultivation conditions,there were some differences in the cultivation status of pepino,but overall,pepino fruit had higher quality.Various physiological indexes were correlated with quality and yield.[Conclusions]This study clarified the specific cultivation situation of pepino in Qinghai Province,and evaluated the quality and yield of pepino,providing strong data support for the promotion and planting of pepino in various regions in the future.

TECTONIC FEATURES AND HYDROCARBON POTENTIAL OF THE EASTERN QAIDAM BASIN

Qaidam Basin, situated in the northeastern Qinghai\|Tibet plateau of western China at 35°55′～39°10′N and 90°～98°20′E, is surrounded by thrusts or folded belts. It is adjacent to the Qilian Mountains on the north and northeast and to the Kunlun Mountains on the south, and to the Altun Mountains on the northwest. Qaidam plate is attributed to carbonate platform and non\|marine basin. The first stage is plate\|form from Sinian to Triassic, and the second is basin\|form in intraplate during non\|marine depositional period in Mesozoic and Cenozoic. 1 Tectonic feature The main structural elements of the eastern Qaidam basin, which the west border line is Germ and Dunhuang highway, include the Huobuxun depression, the Tin\|Iron Mountains ridge and Delingha depression as the secondary tectonic unit. These depressions extend along the northeastern edge of the Qinghai\|Tibet plateau, and form above a zone of Paleozoic pericraton subsidence at the north edge of the Qaidam plate during intracontinental orogenic phase in the Indosinian.

青藏高原东坡地形对影响云南降水的高原涡的作用机理

利用常规观测资料、FNL分析资料及经质控后的自动站小时降水数据,诊断分析了青藏高原东坡地形在2017年7月2-3日高原涡影响云南降水过程中的作用,并利用数值模式WRFv4.0对此次过程进行了地形敏感性试验。结果表明:高原涡是此次云南强降水的重要影响系统;低涡中心及附近区域中高层维持暖心结构,并呈现显著的上升、下沉运动交替的分布;过程累积雨量分布表现为两条明显的与山脉走向平行的西北-东南向雨带,且具有强弱交错的分布特征,强降水集中出现在午后至傍晚及前半夜两个时段内,中心均位于地形边坡,并随着低涡向下游传播;南亚高压、西北辐散气流、西太平洋副热带高压及滇缅高压为低涡的东移发展提供了有利的高空环流场,500 hPa正涡度及700 hPa水汽通量辐合中心对强降水落区具有较好指示意义;低涡降水期间存在β中尺度重力波,波动由青藏高原东坡地形激发,沿着300~200 hPa的气层传播,高空的非地转平衡运动及垂直风切变为重力波的发展及传播提供了有利条件,重力波先于低涡及降水向下游方向移动及发展,波脊处对应上升运动及辐散中心,波槽处对应下沉运动及辐合中心,强降水及波脊均位于低涡西南侧强辐合上升运动区;地形高度降低后,其机械阻挡抬升作用减弱,重力波和高原低涡消失,雨带强度及空间分布特征发生显著改变。高原东坡地形对高原涡的形成和发展,以及高原涡影响下的云南降水具有重要作用。

基于微动探测的四川德达古滑坡空间结构特征与形成机理研究

青藏高原东部地形地貌和地质构造极为复杂,位于该区金沙江流域等高山峡谷区的大型古滑坡具有发育密度大、空间结构复杂等特点,由古滑坡蠕滑变形及复活引起的灾害危害性强。德达古滑坡是位于四川省巴塘县德达乡的一个大型古滑坡,受查龙-然布断裂活动影响,德达古滑坡空间结构特征复杂,滑坡前缘呈现局部复活变形。文章采用遥感解译、现场调查、微动探测和工程地质钻探等工作手段,查明了德达古滑坡的空间结构特征。研究表明,德达古滑坡在平面上分为德达I号滑坡体(I)、德达II号滑坡体(II)和德达古滑坡后壁(Ⅲ)3个部分。通过微动探测结合钻探验证,提出了浅层滑带和深层滑带的微动横波速度划分方案,方案对滑带深度识别相对误差一般为2.6%~4.8%。研究揭示德达I号滑坡体发育2层滑带,浅层滑带S1-1埋深为18.7~20.1 m,深层滑带S1-2埋深为36.2~49.9 m,滑体体积约8.7×10^(6)~12.0×10^(6)m^(3);德达Ⅱ号滑坡体发育1层滑带S2,滑带埋深为25.2~38.6 m,滑体体积约6.3×10^(6)~9.6×10^(6)m^(3)。综合分析认为,德达古滑坡是在断裂活动、降雨入渗、河流侵蚀等多种因素作用下形成的,复杂的滑体结构及其成因是滑坡体处于蠕滑变形的主要控制因素。文章研究方法和取得的认识可以为青藏高原东部大型古滑坡空间结构判识和风险防控提供参考。

MODIS NDVI饱和性对高寒草甸草地生物量遥感估测的影响——以青藏高原东缘为例

自20世纪70年代开始,归一化植被指数(NDVI)在天然草地地上生物量估测研究中得到了广泛应用。然而,NDVI对高密度植被生物量遥感估测存在饱和现象,使草地生物量遥感估测有较大的不确定性。以青藏高原东缘高寒草甸为例,基于比值植被指数(RVI)探讨了NDVI的饱和性,并评估了NDVI饱和性对高寒草甸地上生物量时空动态变化分析的影响。结果表明:(1)虽然基于中分辨率成像光谱仪(MODIS)NDVI构建的草地地上生物量估测模型精度较基于RVI构建的估测模型高,但模型对高寒草地地上生物量(生物量大于2314.627 kg/hm^(2))灵敏度较RVI估测模型低,即NDVI阈值大于0.73时,估测模型呈现饱和现象(低估了草地地上生物量);(2)结合RVI和NDVI的相关关系,对饱和部分NDVI遥感植被指数进行校正,校正后最优地上生物量遥感估测模型为线性模型(y=5908.5x-2198.9,R=0.6190,RMSE=902.41 kg/hm^(2)),较调整前RMSE降低了11.72 kg/hm^(2);(3)就NDVI饱和性空间分布而言,从全年6月—9月初(全年第161—257天)饱和性呈现先自东南向西北延伸,后自西北向东南消退的变化趋势,平均低估值介于158.45—293.92 kg/hm^(2)之间,最大低估值出现在8月初(全年第225天),超过600 kg/hm^(2);(4)此外,NDVI饱和性对草地地上生物量年际动态变化趋势分析具有较大的影响,去除饱和性影响后草地地上生物量基本不变的区域减小了21.44%,而年际变化小于-10 kg/hm^(2)和大于30 kg/hm^(2)的区域分别增加了8.48%和16.19%。研究探讨了NDVI饱和性对草地地上生物量遥感估测的影响,以期为精确评估高寒草地地上生物量提供理论依据,同时也为高寒草地资源可持续发展提供科学依据。

青藏高原东构造结林芝地热田浅部典型电性结构及热储关系

约40 Ma以来,受控于印度板块的俯冲及后期演化,青藏高原喜马拉雅山系东构造结成为了板块活动最强烈的地区之一;由于深部动力学过程中的浅表响应,该地区地热资源极为丰富。笔者等通过对两条音频大地电磁(AMT)测线进行数据处理与分析,查明了测点覆盖区域范围内二维电性结构及主要存在的深大断裂。依据电性结构推测研究区地下1 km深度范围内可分为4层,浅部低阻层为松散砂泥卵石层,下伏的中阻为砾卵石层,其下的低阻为砂岩、板岩、页岩强风化层,最底部的中高阻层推测为古元古界林芝岩群真巴岩组以片岩、花岗岩为主的地层。结合以往大地电磁测深及地震研究发现的地下10~20 km存在大规模近东西向展布且向上延伸熔融流变导致的低速高导体,推测可能是该地区深部热源所在。进一步通过对深部及浅部电阻率模型的综合对比研究,基于地热地质背景、电性结构特征,探讨了该地区的深部热源及热储关系。

青海东部两次区域性大到暴雨的特征分析

利用高空探测资料、ERA5再分析资料、卫星和雷达资料对比分析了2022年8月13日(简称“8.13”)和2023年9月6日(简称“9.6”)强降水过程,结果表明:(1)两次过程都是由副高边缘的西南暖湿气流与西风带波动中的冷空气交汇后造成的;存在2条水汽输送带,一条是高空槽前水汽带,另一条是副高外围东南气流水汽带;整层都为上升运动;低层受高温高湿气团控制,中高层有干冷空气入侵;降水云系主要为副高外围的切变线云系叠加高空冷槽尾部盾状低云,云顶亮温较低;以低质心暖云降水为主。(2)“8.13”前期高温高湿,存储了更多的不稳定能量,配合有更深厚的湿层和更强的上升运动,降水效率更高。分析结果可为今后类似区域性大到暴雨天气过程预报提供参考依据。

青海东部表层土壤碳库特征研究

通过整合青海省东部地区33 092 km^(2)多目标区域地球化学调查和土地质量地球化学调查数据,估算了青海东部地区土壤有机碳、无机碳和全碳的总储量及平均碳密度,并分析了表层土壤碳空间分布特征和不同土壤类型、土地利用及生态系统单位碳密度变化规律。结果表明:研究区表层土壤(0~20 cm)碳总储量为272.81 Mt,平均碳密度为8 243.85 t/km^(2);不同的土壤类型、土地利用和生态系统均对表层土壤碳密度及分布规律产生影响;与土壤二普数据有机碳储量对比,青海东部地区整体属于碳源区,在过去20多年里青海东部表层土壤共释放约53.21 Mt有机碳。

冻融影响下生态系统服务价值和生态风险的时空演变特征及关联性——以南羌塘盆地东区为例

气候变化会显著影响冻土、冰川等对温度变化敏感的生态系统,造成区域生态系统服务价值和生态风险发生变化。为揭示气候变化对青藏高原典型冻土区域的生态系统服务价值的影响和可能造成的生态风险,基于2000-2020年土地利用数据,运用生态系统服务价值(Ecosystem Service Value,ESV)评估、生态风险指数(Ecological Risk Index,ERI)评估、双变量空间自相关、地理探测器等模型和方法,分析了南羌塘盆地东区ESV、ERI的时空演变、空间关联和空间分异特征。结果显示:(1)2000-2020年,南羌塘盆地东区ESV呈增长趋势,累计增长5.76%(276.98亿元),草地和水域贡献了超98.70%的ESV。研究区ESV总体呈中部高、四周低的分布格局,以中等价值区为主(面积约占研究区总面积的70.37%)。(2)研究区ERI整体呈上升趋势,总体呈东南低、西北高的分布格局,以极低风险区为主(面积约占研究区总面积的60.68%)。(3)研究区ESV和ERI具有空间负相关性(Moran s I<0),主要LISA聚类为低价值—低风险(面积约占研究区总面积的34.26%)。(4)区域ESV和ERI的空间分异受自然因子和经济因子共同作用影响,其中归一化植被指数为二者空间分异的主导因子(q值分别为0.55和0.19)。研究结果表明需根据研究区ESV和ERI的时空分布和变化特征,采取因地制宜的生态保护措施,推动区域生态环境的可持续发展。

青藏高原东部大中型兽类多样性及时空分布格局

物种多样性动态变化及种群现状评估对于物种的科学保护至关重要。青藏高原东部属我国西南山地生物多样性热点地区,具有重要科研价值与保护地位。为了有效评估青藏高原东部地区大中型兽类多样性现状与分布格局,以该地区最具代表性的新龙县为主要研究区域,系统收集了2013年以来该区域已发表的红外相机相关文献和数据资料,并于2019年12月—2020年10月开展了红外相机调查。结果表明,目前新龙县至少分布有5目14科36种野生兽类,包括7种猫科动物以及7种国家Ⅰ级和16种国家Ⅱ级重点保护野生动物,被IUCN红色名录评估为濒危(EN)的有2种、易危(VU)7种、近危(NT)6种。历年监测研究中,食肉目和鲸偶蹄目物种均较为丰富,7种猫科动物在间隔近3个年度仍被记录。豹(Panthera pardus)的相对多度指数(RAI)和网格占有率(GO)位于前10位。7种猫科动物的RAI以及GO的大小关系为:豹>豹猫(Prionailurus bengalensis)>猞猁(Lynx lynx)>雪豹(Panthera uncia)>金猫(Catopuma temminckii)>荒漠猫(Felis bieti)=兔狲(Felis manul)。研究发现不同季节下不同生境和不同海拔段均有多种猫科动物与多种主要猎物分布,除了荒漠猫和兔狲外的5种猫科动物与主要猎物和干扰因子在不同季节下均存在不同程度的重叠关系。结果反映出青藏高原东部新龙县猫科动物整体种群现状良好,食物资源较丰富,整个生态系统呈现出健康的状态,但后续需进一步加强猫科动物主要分布区干扰因子的科学管控。同时还指出了新龙县以猫科动物为代表的珍稀濒危野生动物保护工作面临的困境并提出了后续的保护工作建议,以供参考。

青藏高原东缘主要次生林物种多样性与功能多样性随海拔梯度的变化

通过对青藏高原东缘甘肃南部白龙江主要次生林的研究,对物种多样性指数和功能多样性指数进行单因素方差分析和Pearson相关性分析。结果表明:(1)物种α多样性指数(SW)和优势度指数(SN)呈双峰正相关,随海拔的升高先增大后减小最后增大;丰富度指数(S)和均匀度指数(R)呈单峰负相关,丰富度指数(S)表现为先增大后减小,均匀度指数(R)表现为先减小后增大;优势度指数(SN)与均匀度、丰富度指数(S)呈显著性正相关(P<0.05)。(2)β多样性指数表现出相邻海拔区间β多样性指数较大的趋势,海拔区间相差越大β指数越小。(3)功能均匀度指数(FE_(ve))和功能分歧度指数(FD_(iv))随着海拔呈多峰变化,表现出随着海拔的升高先减小后增加然后减小,最后升高;功能丰富度指数(FR_(ic))表现为随海拔的升高先增大后减小然后增大。(4)群落中物种α多样性指数和功能多样性指数呈现复杂的相关性,优势度指数(SN)与均匀度指数(FE_(ve))呈显著正相关,优势度指数(SN)与丰富度指数(R)、多样性指数(SW)与功能分歧度指数(FD_(iv))以及功能均匀度指数(FE_(ve))与功能丰富度指数(FR_(ic))呈显著负相关,其他指数之间相关性均不显著。

青藏高原东缘不同树种人工林对土壤酶活性及养分的影响

为评价不同树种人工林对土壤酶及养分的影响,选择立地条件和营林方式相同的4种人工林(连香树[CJ]、油松[PT]、落叶松[LK]和华山松[PA])为研究对象,以落叶灌丛(QC)为对照,比较不同树种人工林地土壤酶活性和土壤养分的变化。结果显示:(1)造林降低了土壤酸性磷酸酶、脱氢酶、β-葡萄糖苷酶和过氧化氢酶活性,但人工造林后土壤脲酶活性增加;(2)造林也明显影响了土壤养分,与对照林地相比,除CJ人工林土壤中磷(P)略高外,造林地土壤有机碳(TOC)、氮(N)、水可提取有机碳(WEOC)和氮(WEON)、铵态氮(NH+4-N)和硝态氮(NO-3-N)均降低;(3)不同的人工林树种之间土壤养分及酶活性也存在一定的差异性,CJ和LK人工林土壤C、N、P及相关酶活性明显不同于PT和PA人工林;(4)土壤酶与养分变化有一定的相关性,除转化酶和多酚氧化酶反应较迟钝外,其它酶对环境反应较敏感。综合分析表明,在川西地区选择高密度单一树种造林并没有改善土壤养分和酶活性,在该地区选择落叶或阔叶树种造林可使土壤肥力恢复。

青海省东部农业区旱地土壤水分演变特征分析

根据青海省东部农业区具有代表性的互助农业气象观测站观测资料 ,分析了多雨年、干旱年和历年平均土壤湿度特征 ,研究了旱年和多雨年土壤 0～ 2 0 cm、0～ 5 0 cm、0～ 10 0 cm土层有效水分储量年际变化 。

青海东部农区不同饲用燕麦品种生产性能及营养品质的比较

在青海省东部农区对4个燕麦品种(欧歌、莫尼卡、骏马、沙黄麦)全生育期的生产性能、生物量分配及营养价值进行了比较研究。结果表明,4个品种中“沙黄麦”抽穗期株高达到最高,为136.3 cm,鲜草产量在灌浆期最大,达到21716.73 kg·hm-2,显著高于其它品种。同时,“沙黄麦”在生育期茎叶比均小于其它3个品种,完熟期为3.38,具有显著优势;4个品种的粗蛋白含量范围为5.31%~8.54%,中性洗涤纤维含量范围为54%~65%,酸性洗涤纤维的含量范围为30%~40%,营养品质均低于本地育成品种,因此,亟待改善农艺措施以提高引进燕麦品种饲草质量。