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1.
元江栲群落的生物量研究   总被引:6,自引:0,他引:6  
本文研究了滇中半湿润常绿阔叶林元江栲群落的生物量。群落的总生物量为269.729t/hm ̄2,其中树干占54.69%,枝占16.68%,叶占2.92%,根占22.40%,凋落物占3.31%。群落的活生物量为260.811/hm ̄2,其中优势种元江栲占65.43%,其它栎类占18.10%,其它常绿树占9.32%,落叶树占6.75%,灌木种占0.21%,草本植物占0.02%。  相似文献   

2.
黄毛青冈群落的生物量研究   总被引:10,自引:0,他引:10  
黄毛青冈群落是滇中半湿润常绿阔叶林的另一个群落类型。群落的总生物量为135,909t/hm ̄2,其中树干占48.36%,枝占15.44%,叶占4.51%,根占27.76%,凋落量占3.93%群落的活生物童为130.569t/hm ̄2,优势种黄毛青冈占53.95%,其它栎类占16.58%,其它常绿阔叶树占1828%,落叶树占7,15%,灌木占3.88%,草本植物占0.16%。  相似文献   

3.
本文研究了滇中地区半湿润常绿阔叶林黄青冈群落的净第一性生产量,其净生产量为1411.7g/m ̄2·a,其中t树干占40.09%,枝占20.02%,叶占20.18%,根占18.61%,叶被采食量占1.10%。优势种黄毛青冈占49.20%,其它栎类占13.15%,其它常绿树占24.83%,落叶树占8.62%,灌木和草本植物各占3.58%和0.61%。  相似文献   

4.
本文研究了滇中半湿润常绿阔叶林元江栲群落的净第一性生产量,其净生产量为1950.0g/m ̄2·a,其中树干占33.09%,枝占25.47%,叶占21.42%,根占18.60%,叶被采食量占1.42%。优势种元江栲的净生产量占群落净生产量的61.91%,其它栎类占17.21%,其它常绿阔叶树占110.24%,落叶树占8.78%,灌木占0.75%,草本植物占0.13%。  相似文献   

5.
本文通过分析实验证明,种植格拉姆柱花草五年和三年的土壤与对照区土壤相比,有机质增加0.782%和0.69%,增幅分别为38.1%和25.9%;速效氮增加18.7PPM和16.3PPM,增幅达37.4%和21.3%;速效磷增加3.65PPM和6.93PPM,增幅为91.25%和176.48%;速效钾增加6.2PPM和4.77PPM,增幅为72.9%和58%;全氮增加0.025%和0.0232%,增幅分别为24.0%和17.87%.土壤内重要营养元素指标均有大幅度增加,种植年限越长,土壤肥力提高越明显。与此同时pH值上升0.34和0.22,酸性降低;土壤容重降低0.3445g/cm3和0.2050g/cm3,土壤变得更为疏松;毛管持水量增加12.59%和12.02%,土壤保水蓄水能力增强。  相似文献   

6.
用多功能植物杀菌防病促长剂植壮素进行防治烟草花叶病的试验,结果表明:植壮素对烟草花叶病有较好的防治效果,防效率为19.1%-51.3%;烟草植株高度,单株叶片数和叶片鲁重分别增加7.9%-36.9%,13.7-37.8%和14.3%-35.7%,烟草增产6.4%-24.3%,烟叶品质提高,每公亩增加收入322.0-1237.3元。  相似文献   

7.
导入大豆总DNA改良大麦籽粒营养品质   总被引:1,自引:0,他引:1       下载免费PDF全文
利用花粉管通道法和基因枪法将大豆总DNA直接导入大麦。采用微量凯氏定氮法和氨基酸自动分析仪进行大麦后代籽粒蛋白质含量和氨基酸含量分析。结果显示:(1)经花粉管通道法导入大豆总DNA获得的大麦后代有6个单株籽粒蛋白质含量明显超过对照(12.91%),它们是18.23%,16.61%,16.42%,16.58%,16.22%和16.38%,占总数比例的7.06%;(2)经基因枪法导入大豆总DNA共获得12个单株籽粒蛋白质含量明显超过对照(13.29%),它们的蛋白含量分别为16.70%,16.52%,17.9l%,19.59%,17.44%,18.56%,18.46%,17.3l%,16.5l%,18.8l%,18.8l%和19.02%,占总数比例的8.33%;(3)籽粒氨基酸含量分析显示在高蛋白变异后代中,随着籽粒蛋白质含量增加的同时,籽粒总氨基酸和各种必需氨基酸含量也有明显提高.经直线相关分析显示,导入大豆总DNA的后代籽粒赖氨酸等6种必需氨基酸含量与总氨基酸含量呈极显著正相关关系。本试验结果充分说明,直接导入大豆总DNA有可能提高大麦籽粒的蛋白质含量及质量。  相似文献   

8.
应用火焰原子吸收光谱法(FAAS)直接测定不同妊周孕妇及婴儿脐血血清中微量元素含量,并以标准物牛血清作方法质控,监测结果有效地用于产前干预.在最佳实验条件下,各元素的精密度(SR).检出限(ρDL/mg·L-1)和标准加入回收率(Y)分别为:Zn,4.10%,956×10-3,99.0%~103%;Cu,3.50%,0.037,97.0%~101%;Fe,4.27%,0.043,99.0%~103%;Ca,2.29%,0.020,99.0%~101%;Mg,2.29%,3.88×10-3,97.0%~103%.该方法具有用样量少、简便准确、高精密度等特点.  相似文献   

9.
实验室规模的ANANOX工艺(ANaerobic-ANoxic-OXic)用来处理豆制品废水,阐明添加剂对此工艺去除COD、N和P能力.研究结果表明:TCOD去除95.7%,SCOD去除95.8%,去除94.2%,去除89.1%,TKN去除82.4%,TP去除87.4%,SP去除77.2%,SS去除98.0%.比加添加剂之前去除率提高了TCOD9.9%,SCOD10.3%,TP41.4%,SP30.8%,SS8.1%  相似文献   

10.
桔青霉发酵生产核酸酶P1的适宜条件   总被引:5,自引:0,他引:5  
研究了桔青霉生产核酸酶P1的适宜培养基和培养条件,培养其组成为:葡萄糖7%,蛋白胨1%,玉米浆0.2%,磷酸氢二钾0.05%,磷酸二氢钾0.05%,氯化钙0.04%,硫酸锌0.02%,硫酸镁0.03%,硫酸锰0.05%,pH5.4,30℃发酵66h酶活达最高值,粗酶液酶活力400IU/mL。  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

14.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

16.
Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.  相似文献   

17.
以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.  相似文献   

18.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

19.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

20.
Quality traits in wheat (Triticum aestirum L.) were studied by quantitative trait locus (QTL) analysis in a recombinant inbred line (RIL) population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross (ChSh). Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.  相似文献   

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