池塘中水草覆盖度对中华绒螯蟹生长的影响   总被引：1，自引：0，他引：1  

张强  王志斌  杨显斌  朱世海 《畜牧与饲料科学》2014,(12):66-67

为筛选青海地区池塘养殖中华绒螯蟹最佳的水草覆盖度,对中华绒螯蟹在不同水草覆盖度下的体重、成活率及生长发育情况进行了比较。结果表明,当池塘水草覆盖度在60%~80%时,有利于中华绒螯蟹的生长发育,且成活率较高,规格较大。  相似文献   

水草密度对中华小长臂虾养殖池塘水质和生长的影响     

刘艳辉  杨炳坤  高春山  刘铁钢  李秀颖  祖岫杰 《中国农学通报》2022,38(2):100-105

为探索养殖池塘水草覆盖面积对养殖水质和对中华小长臂虾生长性能的影响,设伊乐藻密度为10％、30％、50％(A、B、C)3组试验,每666.7m2放养平均尾重0.01 g的虾苗50万尾.每5天测定一次水化指标,试验结束后测量虾的生长指标及饲料系数.结果 表明,水温在20天后A＞B＞C;溶氧在15天后B＞A,C组在25～4...  相似文献   

Distribution, biology, and agricultural importance of Galinsoga parviflora (Asteraceae)     

CHRISTOS A. DAMALAS 《Weed Biology and Management》2008,8(3):147-153

Galinsoga parviflora , an annual dicot species of the family Asteraceae, is a common herb that is often found in disturbed habitats and agricultural areas in many parts of the temperate and subtropical regions of the world. It is a native of tropical America and the center of its origin is thought to be the mountainous area of Central America. Galinsoga parviflora is considered to be a common weed in several crops of major importance, such as wheat, corn, cotton, tobacco, sugarbeet, tomato, pepper, potato, bean, onion, cabbage, garlic, coffee, citrus, banana, and strawberry; it is frequently found in gardens and uncultivated areas. It succeeds particularly in moist soils and it is favored by a long photoperiod and high light intensity. The significant features of the plant, such as the lack of seed dormancy, rapid growth and development, early flowering, many generations per growing season, production of a great number of seed in a wide range of environmental circumstances, and the ability for easy vegetative reproduction under favorable conditions predispose the plant to be a troublesome weed. These features allow the easy distribution and rapid establishment of the weed in large populations, a fact that often makes this weed difficult to control. Galinsoga parviflora competes strongly, particularly with irrigated crops of short height, and it might also hinder crop harvest. The management of G. parviflora can be achieved by manual weeding, repeated soil cultivation, crop rotation, mulching, and herbicide application. The plant is reported to be edible and is used also for medicinal purposes.  相似文献   

两种观赏水草的离体培养     

王晓萍  吴丽爽  孙玉刚 《中国农学通报》2009,25(5):195-199

本试验以两种观赏水草为供试材料,进行离体培养研究。试验结果表明：红波（Alternanthera bettzickiana）以叶片为外植体,愈伤组织诱导采用MS+6-BA0.5 mg/L (单位下同)+NAA0.2的培养基,芽诱导采用MS+6-BA2.0 +NAA0.05+AD10的培养基,茎尖芽诱导采用MS+6-BA2.0+NAA0.05培养基,继代培养采用MS+6-BA1.0 +NAA0.05的培养基,根诱导采用1/2MS+IBA0.5的培养基;金钱草（Lysima chiachristinae Hance）以茎尖为外植体,芽诱导采用MS+6-BA0.5+NAA0.02的培养基,继代培养用MS+6-BA0.5+NAA0.05的培养基,根诱导采用1/2MS+IBA0.5的培养基,上述培养基中均含有30 g/L蔗糖和6g/L琼脂,PH5.6,在培养温度25℃、光照强度1800Lx、光照时间12h/d的培养条件下,均能培育出完整植株。  相似文献   

克氏原螯虾产卵适宜生态环境的研究     

孙瑞杰  龚世园  马艳霞  何绪刚  张训蒲 《淡水渔业》2008,38(4)

通过模仿野生克氏原螯虾(Procam barus ckarkii)繁殖生态条件,利用水泥池设置不同洞穴和覆盖不同水草进行克氏原螯虾批量产卵试验。在人工洞穴研究试验中,使用石棉瓦洞穴的克氏原螯虾抱卵率最高,最终抱卵率可达到75%,其次是砖制洞穴65%,再次是管道洞穴62.5%,无洞穴组抱卵率最低为45%。在水草研究试验中,使用水葫芦水草的克氏原螯虾抱卵率最高75%,水花生为62.5%,不设水草最差为27.5%。  相似文献