旱稻(Oryza sativa L.)×长芒稗(Echinochloa caudata)远缘杂交初步研究     

赵凤梧  李慧敏  李爱国  梅勤学  王洪利  邱丙文  阎建平  宋金星 《河北北方学院学报(自然科学版)》2000,(4)

以早稻(Upland rice)“旱稻65(Oryza sativa L.)”为母本,“长芒稗(Echinochloa caudata)”为父本进行远缘杂交,对杂种后代连续3年田间试验表明:F_0代高度杂交不孕,去雄约800朵小花田间多次重复授粉结果,结实率仅为1.21‰。F_1代杂种优势明显,育性正常,结实率92.26％,不存在后代不育现象。F_2代在芒性、株高、穗长、一级技梗数、穗粒数及生育期等性状上分离严重,但育性无分离,405株群体无不育株出现。目前已选育出生育期较母本早5d的大穗、多粒变异单株F_2-1。该单株在稀植条件下,一级枝梗数11.5个,穗粒数112粒,穗结实粒数104粒,千粒重27.5g,单株生产力10.73g,超亲优势为55.64％。  相似文献   

Responses of Ryegrass(Lolium perenne L.) Grown in Mudflats to Sewage Sludge Amendment     

BAI Yan-chao  GU Chuan-hui  TAO Tian-yun  ZHU Xiao-wen  XU Yi-ran  SHAN Yu-hua  FENG Ke 《中国农业科学(英文版)》2014,(2):426-433

Sewage sludge amendment(SSA)is an alternative waste disposal technique and a potential way to increase fertility of mudflats for crop growth.The present study aimed to assess the suitability of SSA by assessing the nitrogen(N)and phosphorous(P)uptakes,heavy metal accumulation,growth,biomass,and yield response of ryegrass(Lolium perenne L.)at 0,30,75,150,and 300 t ha-1 SSA rates at various growth stages.The results showed that the highest biomass of ryegrass at seedling and vegetative stages were at 300 and 150 t ha-1 SSA rate,respectively.The increments of ryegrass yield at reproductive stage at 30,75,150,and 300 t ha-1 SSA rates were 98.0,122.6,88.1,and 61.2%,compared to unamended soil.N and P concentrations in ryegrass increased with increasing SSA rates at all stages except N and P in roots dropped significantly at 300 t ha-1 rate at vegetative stage.The metal concentration for Mn,Cu,Zn,Ni,Cd,Cr,and Pb in shoot of ryegrass at300 t ha-1 SSA rate increased by 0.63-,2.34-,15.02-,0.97-,10.00-,0.01-and 1.13-fold,respectively,compared to unamended soil.However,heavy metal concentrations in shoot of ryegrass were lower than the standard for forage products in China.The study suggested that sewage sludge amendment in mudfl at soils might be feasible.However,the impacts of sludge application on edible crop plants and soil environment need further investigations.  相似文献   

Characterisation of Neonicotinoid and Pymetrozine Resistance in Strains of Bemisia tabaci（Hemiptera：Aleyrodidae）from China     

RAO Qiong  XU Yong-hua  LUO Chen  ZHANG Hong-yu  Christopher M Jones  Greg J Devine  KevinGorman  Ian Denholm 《中国农业科学(英文版)》2012,(2):321-326

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Determination of Optimum Growing Degree-Days （GDD） Range Before Winter for Wheat Cultivars with Different Growth Characteristics in North China Plain     

LI  Qiao-yun YIN  Jun LIU  Wan-dai ZHOU  Su-mei LI  Lei NIU  Ji-shan NIU  Hong-bin MA  Ying 《中国农业科学(英文版)》2012,(3):405-415

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DECIDUOUS AND DECIDUOUS-EVERGREEN FORESTS IN NORTHEAST CHINA     

Chou Yiliang Liu JianweiNortheast Forestry University 《林业研究》1991,(1)

Two types of forests in Northeast China is divided in this paper,that is,the decidu-ous forests in the northern part and the deciduous-evergreen forests in the eastern part.Both distri-butions of the two types of forests have also been pre sented.Meanwhile,the development and suc-cession as well as components of forests have been studied in detail.in the end,the vertical distribu-tion of the deciduous forests have been shown,in which,the near-temperate cold temperate decidu-ous coniferous forests are distributing in the low elevation area between 450m—600m from the northto the south,the typical siberian cold temperate deciduous coniferous forests are widely distributingfrom 450m—820m in the north to 600m—1050m in the south, the humid cold temperate deciduousconiferous forests can only be found in high elevation area from 820m—1100m in the north to1050m—1380m in the south,the cold temperate deciduous coniferous open forests can seldom ap-pear at the top of a few peaks.  相似文献   

森林害虫灾害预警指标体系研究   总被引：5，自引：0，他引：5  

王桂清  周长虹 《林业科技》2003,28(5):21-24

森林害虫暴发频率高、危害程度重、经济损失大，其重要原因是对森林害虫灾害发生的预警能力差。确定森林害虫灾害预警指标应坚持可测性原则、可靠性原则、准确性原则、代表性原则，匹配性原则。森林害虫灾害预警指标体系应包括警情指标、警源指标和警兆指标。  相似文献   

江苏省61个树种木材燃烧热的测定     

王育民  袁绍西 《江苏林业科技》1992,19(2):6-12

测定了江苏省61个树种26科树木木材燃烧热,为本省营造薪炭林树种的选择提供了科学的依据。  相似文献   

A QUANTITATIVE STUDY ON“THREATEN LAND EFFECT”OF SHELTERBELT     

Bao QingInstitute of Forest Management in Heilongjiang ProvinceRen QingshanNortheast Forestry University 《林业研究》1992,(1)

The paper studied and analyzed the threaten land errect of shelterbelt using a quanti-tative method.A series of effect indices and their calculative methods were put forward.These indi-ces included threaten land height,threaten land angle,useful distance of threaten land or implanting(unsowing)distance,and rate of threaten land,etc.  相似文献   

土地质量分级方法及其在黄峪口小流域的应用(英文)     

王久丽  苏新琴  刘永  耿智慧 《中国林学(英文版)》1997,(1)

土地分类法是土地资源合理利用和规划研究中首先要解决的一个问题．在以往的土地分类研究中，一般是以“地块”为土地单元，“地块样本”是分类的对象，其数据是以地貌部位、利用现状、坡度、坡向、土壤种类、土壤侵蚀类型等众多指标因子（定性因子居多数）来表现某一特定“地块”的特征．按各个“地块”在不同指标因子上的不同“表现”，分别用数字１，２，３，…等将其“量化”，然后用普通多元统计分析中的距离度量方法，以欧氏距离、最大（最小）距离、相似系数…等间隔尺度的统计量，来衡量地块样本之间“相近”或“相离”的尺度，采用动态聚类或系统聚类等方法，对“地块”进行分类．这里值得注意的是：地块样本的数据具有定性、高维、离散的特点，尽管可以进行“量化”处理，以数字１，２，３，…等来表示，但这些数字只是用来表示不同程度的“标志”而已，它本身并没有任何“量”的含义，更没有“大”与“小”的区别．那么对这样“量化”的数据采用普通多元统计分析中定义距离的方法，显然很不妥当，因为这样计算得到的距离，并不能真正反映出地块样本之间的实际“距离”．因此有必要重新认识“地块样本”之间的“距离”，正确而客观地对其进行科学的分类．本文依据地块样本数据定性、高维、离  相似文献   

广西华枝属一新种记述（目:异科）     

陈培昶  陈树椿 《中国林学(英文版)》1996,(2)

本文记述了采自广西壮族自治区的目华枝属的一个新种，模式标本保存在北京林业大学．拟异尾华枝．新种（图１，ａ，ｂ）．本新种与异尾华枝ＦＤＡ１ＳｉｎｏｐｈａｓｍａｍｉｒａｂｉｌｅＧüｔｈｅｒ很相似，但本种身体细长，下生殖板后缘具３个状突，尾须基部加宽，较扁，端部渐尖申向后侧，可与之区别  相似文献