重庆喀斯特地貌型优良牧草引种筛选试验   总被引：2，自引：1，他引：1  

范彦 徐远东方亚  王琳黄勇富  姚家志 《四川草原》2004,(4):18-21

通过3年对29个牧草品种物候期、适应性能、产量、主要营养成分、再生性能等进行的试验研究,在酉阳县3个不同海拔高度共筛选出20个优良牧草品种,其中豆科6个、禾本科11个、其他科3个。这些牧草产量高、适应性强、营养价值高,可作为喀斯特地貌型区域人工草地建植、天然草地改良的主打草种,可进行大面积推广。  相似文献   

水培碱性胁迫法对4个草种的抗碱性研究     

费永俊赵宇瑛  陈万刚 《四川草原》2004,(8):13-15

以白三叶(White clover,Trifoluum L.)、拂浪(Fine lawn,Festuca Schreb)、纽布鲁(Kentucky bluegrassPoa L.)和普特(Putter Agrostis L.)作为试材,采用水培法研究了不同pH值对其叶绿素含量等生理指标的影响。结果表明,在这4个草种中,纽布鲁具有较强的抗碱性。  相似文献   

科尔沁地区禾豆混播人工草地生产特性分析     

张淑艳  张永亮 《中国草地学报》2003,25(5):32-37

在科尔沁草原地区进行了不同草种和不同播种量组合的混播人工草地生产特性的研究。结果表明,无芒雀麦、苇状羊茅、披碱草、鸭茅、紫花苜蓿均具有较强的种间竞争能力,种间相容性较好;白三叶、草地早熟禾、猫尾草在苗期种间竞争能力较弱,幼苗死亡率较高,生长发育不良。在生产特性方面,草地早熟禾+鸭茅+猫尾草+紫花苜蓿+白三叶(组合Ⅰ)草地豆科牧草平均产量显著大于禾本科牧草产量(P<0.01);无芒雀麦+苇状羊茅+披碱草+紫花苜蓿+白三叶(组合Ⅱ)草地禾本科与豆科牧草产量差异不显著(P>0.05)。在全年总产量中,组合Ⅱ的禾本科牧草产量显著大于组合Ⅰ(P<0.05)。在本试验条件下,适宜的混播组合是:无芒雀麦占40.3%,苇状羊茅+披碱草占32.9%,紫花苜蓿占26.8%,总播种量37.3kg/hm2,全年干草总产量可达8580.12kg/hm2,其中禾本科牧草占50%左右,适合于放牧刈割利用。  相似文献   

高寒牧区牧草引种及混播技术的研究   总被引：15，自引：6，他引：9  

施建军 《青海畜牧兽医杂志》2002,32(5):5-7

在海拔高度近4000m的高寒牧区对10个燕麦优良品种进行引种比较试验，结果表明，10个品种均不能成熟，只能达到孕穗期，其中丹麦444、巴燕5号和选18等3个品种的青干草产量极显著高于对照巴燕3号，可在该地区推广种植。21个多年生禾草品种的引种试验表明，其产草量和越冬性能，上繁草中以垂穗披碱草，多叶老芒麦、紫野麦草较好；下繁草以中华羊茅、西北羊茅、毛稃羊茅、冷地早熟禾、紫羊茅（同德）、星星草为好。混播试验表明，多叶老芒麦30％＋中华羊茅70％的垂穗披碱草70％＋西北羊茅30％在第二、三年群落结构和产草量优于其它混播处理和单播。说明在高寒牧区利用多年生禾本科牧草混播是解决人工草地品种单一，优化群落结构，提高产草量的较好途径。  相似文献   

Silvopastoral systems in northwestern Patagonia. I: growth and photosynthesis of Stipa speciosa under different levels of Pinus ponderosa cover     

M. E. Fernández  J. E. Gyenge  G. Dalla Salda  T. M. Schlichter 《Agroforestry Systems》2002,55(1):27-35

Combination of native pastures with fast-growing tree species (mainly Pinus spp.), may be an interesting economic and environmental alternative for small and medium land-owners in Patagonia,Argentina. Pasture productivity is usually the single most important factor affecting livestock carrying capacity. Therefore the prediction of the effects of tree cover on understory herbaceous production is of great importance for management. This paper reports the growth response of Stipa speciosa Trin. et Rupr. (tillering, tiller height, number of green leaves per tiller, and relative growth) to Pinus ponderosa Doug. (Laws) canopy cover (0 to 100%). Grasses did not grow when crown cover was >70%. Tiller production and relative growth were negatively correlated with tree cover; tiller height was larger under high tree cover. There was no relationship between leaf production and tree canopy cover. Grass leaves maintained net photosynthetic rates, at similar light levels, at a wide range of plant water potentials (from saturation to at least –2.4 MPa). Decrease in photosynthesis occurred at very low plant water potentials (–4.3 MPa). No differences in photosynthetic rate at similar radiation levels were foundbe tween plants growing in different light environments (determined by tree cover) in the field. Stipa speciosa can maintain positivenet CO₂ assimilation and growth under moderate shading and severewater stress conditions. For this reason, it can be used in silvopastoral systems, with a proper light management.This revised version was published online in November 2005 with corrections to the Cover Date.  相似文献   

A simulation model for evaluating technical and economic aspects of an industrial eucalyptus-based agroforestry system in Minas Gerais, Brazil   总被引：1，自引：0，他引：1  

F. Dube  L. Couto  M. L. Silva  H. G. Leite  R. Garcia  G. A. A. Araujo 《Agroforestry Systems》2002,55(1):73-80

This study analyses the economic aspects of a eucalypt-based agroforestry system established in the savanna region of Brazil. In 1993,eucalypt clones were planted at a spacing of 10 × 4 m, to facilitate their future association with crops and pasture grasses. The results show that the establishment and maintenance costs represent 37% of the total costs associated with the system. More than half of the revenues are from the sale of the wood products obtained in the 11-year rotation. Variations of ±20% of the sale price of the cattle significantly affected the sensitivity analysis, closely followed by the variations of the price of wood for lumber and energy. Variations of ±20% of the establishment costs of the forest component significantly affected the economic indicators. The viability of the system is also sensitive to a slight change in interest rate. Finally, the agroforestry system adopted by the company is economically more attractive than eucalypt monoculture.This revised version was published online in November 2005 with corrections to the Cover Date.  相似文献   

Growth of radiate pine (Pinus radiata D. Don) as influenced by understory species in a silvopastoral system in New Zealand   总被引：1，自引：0，他引：1  

Scott X. Chang  Donald J. Mead 《Agroforestry Systems》2003,59(1):43-51

  相似文献   

豆科鲜牧草破碎机的研究与试验   总被引：1，自引：0，他引：1       下载免费PDF全文

李志伟  李就好  卢小良 《农业工程学报》1995,11(1):175-179

针对豆科鲜牧草的物理机械特性,分析了机械破碎作用的力学机理,认为合适的打击作用力是该类物料有效的破碎加工方法。在试验研究的基础上,设计研制了“93D—324型鲜牧草捣泥机”。使得在不加水的情况下,把豆科鲜牧草破碎成细碎纤维状或浆状饲料,满足喂猪的饲养要求。  相似文献   

Quantification and bioavailability of scyllo-inositol hexakisphosphate in pasture soils     

Benjamin L. Turner  Nathalie Mahieu  C.R. Chen 《Soil biology & biochemistry》2005,37(11):2155-2158

The recent identification of scyllo-inositol hexakisphosphate in alkaline soil extracts by solution ³¹P NMR spectroscopy allowed us to investigate this compound in soils by re-analyzing spectra from two previously published studies. Concentrations of scyllo-inositol hexakisphosphate in 29 temperate pasture soils from England and Wales ranged between 11 and 130 mg P kg⁻¹ soil and accounted for between 4 and 15% of the soil organic phosphorus. The ratio of scyllo-inositol hexakisphosphate to myo-inositol hexakisphosphate ranged between 0.29 and 0.79. In a 10 month pot experiment with six grassland soils from New Zealand, growth of pine seedlings (Pinus radiata D. Don) decreased scyllo-inositol hexakisphosphate concentrations by between 10 and 46%. Growth of ryegrass (Lolium perenne L.) decreased scyllo-inositol hexakisphosphate in three low-nutrient soils by 5-21%, but increased it in three other soils by 11-16%. We conclude that scyllo-inositol hexakisphosphate is an important component of soil organic phosphorus with potential ecological significance.  相似文献   

Phenotypic diversity of Ethiopian grass pea (Lathyrus sativus L.) in relation to geographical regions and altitudinal range     

Wuletaw Tadesse  Endashaw Bekele 《Genetic Resources and Crop Evolution》2003,50(5):497-505

Fifty grass pea (Lathyrus sativus L.) populations collected from different administrative regions and altitude classes in Ethiopia, were evaluated for variations of five morphological traits. Shannon-Weaver diversity index was calculated for traits, populations and altitude classes. Monomorphism was recorded in flower color (blue) for most of the populations. Olive seed colour was dominantly distributed in all regions with mean frequency of 50% while black seed colour is rare with mean frequency of 4% in Ethiopia. Much variability was observed within populations. High diversity values for pattern of testa colour and leaflet size were recorded in populations of highland origin (>2550 m.a.s.l.). Shannon's diversity index is highest in Gondar (H = 0.65) followed by Tigray region (H = 0.64) even though there was no significant variation in H values between regions. These regions with high diversity are recommended for immediate in situ and ex situ conservation.  相似文献