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Ecological environment factors affecting its growth and development and the spatial distribution characteristics of plant autoeciousness of Hemiberlesia pitysophila were comprehensively analyzed by combining Maxent ecological niche models with geographical information system technique in this paper.The relatively exactly potential distribution region of Hemiberlesia pitysophila in whole Chi...

本文选用Maxent生态位模型与地理信息系统相结合,综合分析影响松突圆蚧生长发育的环境因素,结合寄主分布特征,非常直观定量地获得了松突圆蚧在我国的潜在发生区,计算结果经ROC曲线分析法验证,Maxent生态位模型的AUC值为0.991(非常接近于1),表明预测获得了较好的效果,研究可为松突圆蚧的检疫及防治决策的制定提供科学依据。

At the GS0.512 level, all accessions were clustered into 4 groups. It suggested that there were some correlations between Carthamus tinctorius and geographical distribution.

在GS值为0.512的水平上,供试材料聚为六大类,聚类结果表明,红花醇溶蛋白图谱类型与其地理分布有一定的相关,但不显著。

Previous vegetation investigation in Dinghushan 20ha permanent plot which was established at 2005, suggested that Castanopsis chinensis is the most important species in plot.

在2005年建立的鼎湖山20ha大样地植被调查研究中表明,样地内锥栗在样地植被中的重要值最大,是该地区森林群落构成的主要成分,其分布格局的变化可能直接影响到整个群落的格局演化。

Its insecticidal active ingredients are sesquiterpenoid polyol esters with a dihydroagarofuran structure. These compounds are stable to light, heat, and pH, and exert a narcotic and toxic poisoning action. Celastrus angulatus contains a plant-origin insecticide with a unique mechanism of action. Celangulins, a 0.2% emulsifiable concentrate has already been developed for insect control.

是我国广泛分布的一种杀虫植物,其杀虫有效成分基本上均是以二氢沉香呋喃为骨架的多元酯类化合物,对光、热和pH值均稳定,对害虫主要表现为麻醉和毒杀作用,苦皮藤是一类作用机理独特的植物源杀虫剂,在其实际杀虫的应用上,已经开发出了0.2%苦皮藤素乳油。

There were only 94 vascular plant species, belonging to 50 family and 75 genera. The dominant species in the communities were deciduous broadleaf species Liquidambar formosana, Robinia pseudoacacia, Ailanthus altissima, Acer buergerianum, and Celtis sinensis, evergreen broadleaf species Cinnamomum camphora and Elaeocarpus glabripetalus, and Phyllostachys heterocycla. Robinia pseudoacacia+Cinnamomum camphora community had the highest Shannon-Wiener index (1757) and Phyllostachys heterocycla+Acer buergerianum community had the highest Simpson index (0163), but no consistency was observed between the curves of H and D. For vertical structure, most communities had no significant understory stratification.

结果表明:辰山植物区系以泛热带和北温带占优势,具有典型亚热带和温带成分交汇和南北植物分布交错特征;但保育区内种类单一,维管束植物仅有49科69属94种;主要群落是以枫香、刺槐、臭椿、三角枫和朴树等为优势树种的落叶阔叶林,以香樟和秃瓣杜英等为优势树种的常绿阔叶林,以及毛竹林;物种多样性普遍较低,Shannon-Wiener多样性指数最高为刺槐+香樟群落(1.757),Simpson均匀度指数最高值为毛竹+三角枫群落(0.163);多样性指数曲线和均匀度指数曲线不具有一致性的变化趋势;多数群落垂直结构中无明显林下分层现象;演替前期的落叶乔木种群后续个体不足。

In the feature space,the divergences on two classificational distributions are only dependent on the two characteristic vectors,i.e.,maximun and minimum in feature values,and their varying values depend upon the declinations of the aforementioned two ...

在特征空间上两类分布的分离度只依赖于特征值最大和最小的两个特征向量,且其大小依赖于上述两个特征值与某个定值的偏差。

The morphological characteristics, annual growth cycle and reproductive value of P. fengduensis were compared with cogeneric widespread species P.

为保护这一即将野外灭绝的稀有植物,在对其地理分布、生态学和群落学调查的基础上,对其形态特征、年生长周期和生殖值与同属植物车前P。

The sensitivities of the isolates to azoxystrobin were assayed by the methods of conidial germination and mycelial linear growth. The results demonstrated that the EC50 values for conidial germination and mycelial growth ranged from 0.0201 to 0.2600 μg/mL and 0.0053 to 0.0794 g/mL, and averaged 0.042 6 and 0.0250 μg/mL, respectively.

结果表明:嘧菌酯对供试菌株孢子萌发和菌丝生长的EC50值均呈单峰分布,分别介于0.020 1~0.260 0μg/mL和0.005 3~0.079 4μg/mL之间,平均值分别为0.042 6μg/mL和0.025 0μg/mL。

The actual CP effectiveness of Ma anshan and Wuhu pipeline suffered stray interference was well. The soil corrosibility distribution along the pipeline was obtained. IR-drop statistical value of 170mV was obtained to revise protection potential criterion that is substituting -1.02V for -0.85V.

经过检查片设计、试验方案实施以及数据处理分析,得到了管道沿线阴极保护度和土壤腐蚀性分布;获得该地区IR降误差的统计值为170mV,并修正了管道保护电位准则(以-1.02V替代-0.85V)。

Genetic diversity of Croomia The results of inter-simple sequence repeat indicated that the genetic diversity of Croomia was very low. At the population level, the genetic diversity of C. japonica PPB = 21.20%, H_(pop= 0.0644, I = 0.0981, N_e=1.1077 was lower than that of C. heterosepala PPB = 29.81%, H_(pop= 0.0944, I = 0.1424, N_e=1.1613. But at the species level, the genetic diversity of C.

Croomia的遗传多样性分布格局 ISSR分子标记的研究结果显示,Croomia居群水平的遗传多样性很低,其中C.japonica的遗传多样性PPB=21.20%,H_(pop=0.0644,I=0.0981,N_e=1.1077稍低于C.heterosepala的PPB=29.81%,H_(pop=0.0944,I=0.1424,N_e=1.1613;而在物种水平上相反。C.japonica和C.heterosepala居群间的分化都明显大于居群内的分化,其居群间分化值F_分别为73.60%和54.99%。

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