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苟日升 《山西农业大学学报(自然科学版)》2005,25(3):278-279
文章利用生物转化工程原理将硫酸锌加入牛饲料间接强化牛乳进行了试验观察,效果转好。强化后牛乳无外观质量变化,乳锌经一个高峰期四周后处于稳定状态,其含量可满足婴幼儿生长发育的需要。同时,还提出了硫酸锌强化饲料的适量剂量。并就乳牛饲龄、胎次、体重、产乳期对乳锌的影响和强化方法进行了探讨分析。通过此项研究,为解决目前缨幼儿缺锌问题,开发了一个吸收率高、副作用小、安全可靠的补锌源。 相似文献
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1983~1985年以“黄壳早”、“芦竹青”、“古巴苎麻”和“武冈红皮种”为材料进行自交,并观测了自交一代的分离和变异情况,研究结果表明:a.根据自交一代的形态分类,可将“芦竹青”繁殖后代分为40个类型,“芦竹青”自交一代的麻骨颜色分离为四种,其分离比例为9.3:4.2:3:0.7,基本符合孟德尔遗传规律;b.个体间产量性状差异很大,株高变冥为0.23~1.68m,茎粗变异为0.48~1.14 cm,有效株变异为1~23株;c.40个类型的纤维细度的变异呈正态分布,变异为1168~1905公支,最细的类型和最粗的类型相差747支上述结果表明:苎麻自交后代的形态性状、产量性状和纤维细度均产生显著的分离和差异。 相似文献
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Effects of land ownership and landscape-level factors on rare-species richness in natural areas of southern Ontario,Canada 总被引:5,自引:0,他引:5
Lovett-Doust J. Biernacki M. Page R. Chan M. Natgunarajah R. Timis G. 《Landscape Ecology》2003,18(6):621-633
Surprisingly few studies have considered the extent to which the nature of the ownership of land is associated with differences
in biodiversity. We analysed ownership and other landscape-level effects on rare-species richness for both globally- and regionally-rare
biota (including birds, herpetofauna, butterflies, mammals, and plants) in 289 designated natural areas (NAs) in southern
Ontario, Canada. Information about each NA −including area, number of plant communities, ownership status and details of species
diversity were collected from published sources. Length of perimeter of NA, relative isolation, and an estimate of fragmentation
were measured using image analysis and GIS techniques. NAs were in general relatively small, with mean area of 158 ha (median
85 ha, range from 0.9 to 1278 ha) for private NAs; public NAs had mean area of 132 ha (median 16 ha, range from 0.1 to 1481
ha). Mean number of plant communities was 4.6 (median 4, range 1- 13) at private NAs and 3.8 (median 3, range 1-16) at public
NAs. Our results show that, of several landscape-level factors, area had the greatest effects on rare-species richness and
other biotic indices. Effects of area were followed by effects of plant community diversity, however this was itself significantly
affected by area and the extent of perimeter of the NA. Both these factors were followed by effects of ownership of the NA
and by effects of isolation of the NA (represented by minimum distance to nearest NA and by number of NAs in 10 km radius).
Other landscape- level factors did not appear to have overall significant effects. Variation in area accounted for 0.1% to
29% of variation in number of rare species, with lower values for globally-rare, than for regionally-rare taxa. For all biotic
groups, public ownership of NAs was associated with significantly greater rare-species richness compared to private ownership,
even after other factors such as area were controlled. For all globally-rare biota except butterflies, area of NA had greater
effects on rare-species richness than did ownership. Richness of regionally- rare birds was more affected by plant community
diversity than by area of NA. Number of recorded plant communities accounted from 2.1% of variation in number of globally-rare
plant species to as high as 31% of variation in regionally-rare butterflies. The diversity of plant communities was itself
influenced by total site area (accounting for 45% of variation), extent of elongation of the NA, and both external- and interior-
edge perimeters. Public NAs had greatest numbers of rare biota and so should be a significant focus for conservation programs.
Smaller, privately-owned patches of natural area dominate (by number and area) in this densely populated region and their
significance should not be overlooked.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
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Effects of winter wheat cultivars and seed rate on the biological characteristics of naturally occurring weed flora 总被引:3,自引:0,他引:3
Summary Differential competitive ability of six winter wheat cultivars and traits that confer such attributes were investigated for a range of seed rates in the presence or absence of weeds for a naturally occurring weed flora in two successive years in split-plot field experiments. Crop height and tillering capacity were considered suitable attributes for weed suppression, although competitiveness is a relative rather than an absolute characteristic. Maris Huntsman and Maris Widgeon were the most competitive cultivars whereas Fresco was the least competitive. Manipulation of seed rate was a more reliable factor than cultivar selection for enhancement of weed suppression, although competitiveness of cultivars Buster, Riband and Maris Widgeon was not enhanced by increased seed rate. Crop densities ranging between 125 and 270 plants m−2 were found to offer adequate weed suppression. Linear relationships were observed between individual and total weed species dry weight and reproductive structures per unit area. 相似文献
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本文综述了对螟虫长距茧蜂的研究概况,包括该寄生蜂的主要生物学习性、对玉米螟自然寄生率及田间防治玉米螟效果等。 相似文献
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