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空间格局参数
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  spatial distribution parameter
     Anal-ysis on causes of larva aggregated in forest through spatial distribution parameter m, K, α,β, and relation of x= K_c(P_0~(-1/(Kc))-1), larva density was estimated by percentage of non-diseasedstem.
     并利用其空间格局参数m~*、K、α、β值,分析了幼虫在林间聚集的原因,应用x=K_C(P_O~(-1/Ke)-1)关系,由无虫株率来估计幼虫密度。
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  “空间格局参数”译为未确定词的双语例句
     The Characteristics and Application of the Spatical Parameters of Cotton Aphid
     棉蚜空间格局参数特征及其应用
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     Samples of Echinocnernus squameus from 36 paddy fields are analyzed to determine its population spatial pattern in terms of pattern parameters I,C_A,I_δ,m~*/m, α and β.
     本文根据36块田的调查,用种群空间格局参数I、C_A、I_δ、m~*/m和α、β值进行分析,稻根象甲幼虫和(?)
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     The spatial distribution parameters ( 、 C A、 I δ、 、 α、 β) of the soybean aphids were analyzed, and the reason of contagious patterns of the aphids was discussed.
     利用大豆蚜种群的空间格局参数m、CA、Iδ、mx、α、β和种群聚集均数λ值,分析了大豆蚜种群聚集的原因,估计了个体群平均大小及其与平均密度的关系。
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     STUDIES ON THE CHARACTERISTICS AND APPLICATION OF THE SPATIAL DISTRIBUTION PARAMETERS OF RICE SKIPPER EGGS IN RICE FIELDS
     稻苞虫卵空间格局参数特征及其应用
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     The characteristics and application of spatial distribution of Aleurocanthus spiniferus (Quaintance)
     黑刺粉虱空间格局参数特征及其应用
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     The spatial distribution parameters of wheat midge Sitodiplosis mosellana (Gehin) in wheat fields and their application
     小麦吸浆虫空间格局参数及其应用
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     The Characteristics and Application of the Spatical Parameters of Cotton Aphid
     棉蚜空间格局参数特征及其应用
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     STUDIES ON THE CHARACTERISTICS AND APPLICATION OF THE SPATIAL DISTRIBUTION PARAMETERS OF RICE SKIPPER EGGS IN RICE FIELDS
     稻苞虫卵空间格局参数特征及其应用
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     空间
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     Spatial Distribution Characteristics of Urban in Shandong Province
     山东省城镇空间格局
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This paper deals with the spatial distribution patterns of the rampant generation eggs of the rice skipper, Parnara guttata Bremer et Grey, in hybrid rice-producing area of Northwest Sichuan.Five aggregation indices including: k, CA, lDM, M and I8 together with lwao's method were used to test the distribution pattern of rice skipper eggs and (he structure of its spatial distribu-tion. It was found that all the indicrs indicate that the distribution of the eggs is in the aggre-gative pattern. The paramcters a,...

This paper deals with the spatial distribution patterns of the rampant generation eggs of the rice skipper, Parnara guttata Bremer et Grey, in hybrid rice-producing area of Northwest Sichuan.Five aggregation indices including: k, CA, lDM, M and I8 together with lwao's method were used to test the distribution pattern of rice skipper eggs and (he structure of its spatial distribu-tion. It was found that all the indicrs indicate that the distribution of the eggs is in the aggre-gative pattern. The paramcters a, (3 of Iwao's can be used to prove that the eggs in rice fields fit the negative binomial distribution. They occur in leose colonies the distribution of which is aggregative and the intra colony distribution is candom.On the basis of the M - x relationship,the spatial pattern of rice skipper eggs fets the negative binomial distribution. The reasons for aggrcgation, eggs mortality on rice plant bills, and mean colony size are analyzed with the parameters of aggregation K and mean crowding M The result shows that the aggregation of eggss seems to be due to some environmental factors as the mean density per hill is less than about 2.21, and beyond this, the aggregation may be due both to active aggregation by the adults and to certain Leterogeneity of the environment.Since the distribution of eggs follows a negative binomal pattern, the proportion of plants uncarrying eggs (Po) and the number of eggs per 100 hills (x )may be expressed by the equa-tion:i.e., the mean density per 100 hills can be estimated from the proportion of zero frequency (Po), as in the relationship shown in Fig 6. This method provides an alternative to sequential sam-pling as a basis for pest control decision. !t is particularly useful if the critical density levels are related to the value of Po bigger than 0,1 and below this, the uncertainty involved in predic-tions may be 韔o greai. The necessary sample size (n) for a fised precision level (D) is also shown in Fig 6. It can be seen that the necessary sample size increases gradually with increa-sing Po.The sequential sampling based on a binomial distribution which corresponds to an esti-mation based on the frequency of zero is made. The chart for the sequential test is shown in Fig. 8.

近年来,稻苞虫已成为川西北稻区仅次子螟虫的严重害虫。为对其生物学特性的进一步了解,1978—1983年对猖獗世代(第三代)卵在稻田空间格局进行了研究,结果表明稻苞虫卵在稻田呈负二项分布;格局的结构是以疏松的个体群形式存在;个体群间是聚集的,个体群内的卵粒是随机的。利用空间格局参数Mk、α、β值,估计了个体群的大小和与平均密度的关系;分析了卵在稻田聚集的原因;探讨了平均卵密度与k值的关系。依:(?)=K(P~(-1/k)_0-1)关系由未着卵频率(P_0)来估计卵密度。给出了以零频率估计卵密度和以概率保证的理论抽样数方法的结合,来实现有效的简易抽样。同时以未着卵丛率来检定田间发生程度和以卵量来检定是否达到现行防治阈限的序贯抽样检索。

According to the parameters of spatial patterns of Parocneria orienta and its distribution law in a tree, and in the light of the standard of Morris (1960) adn the model of Iwao (1971), selection is made on sample units of Parocneria orienta populations and an individual is determined as a sample unit. Parallel-line, Z and checkered sampling methods are adopted. And theoretical sampling number tables are listed at the time of permissible errors D=0. 05, 0.10,0. 20 and 0. 50 and at differ ent population densities....

According to the parameters of spatial patterns of Parocneria orienta and its distribution law in a tree, and in the light of the standard of Morris (1960) adn the model of Iwao (1971), selection is made on sample units of Parocneria orienta populations and an individual is determined as a sample unit. Parallel-line, Z and checkered sampling methods are adopted. And theoretical sampling number tables are listed at the time of permissible errors D=0. 05, 0.10,0. 20 and 0. 50 and at differ ent population densities. In addition, sequential sampling tables are established in the light of the model of Kuno (1969).

根据蜀柏毒蛾的空间格局参数及株内分布规律,参照Morris(1960)的标准和Iwao(1971)的模型,对蜀柏毒蛾种群样本单元进行选择,确定以株为样本单元,并选择平行线式,Z字形式、棋盘式取样方法,列出了允许误差D=0.05,0.10,0.20,0.50时和不同虫口密度下的理论抽样数表。依照Kuno(1969)模型建立了序贯抽样表。

Samples of Echinocnernus squameus from 36 paddy fields are analyzed to determine its population spatial pattern in terms of pattern parameters I,C_A,I_δ,m~*/m, α and β. A negative binomial distribution with common k values is shown for both larvae and adults when the average density of adults ≥0.6 head per quadrat (1 quadrat=0.5m~2) and a complete randomness is found for adults when <0.6 head per quadrat. The dynamics of adult patchiness, such as patch size and occupied area, seems to be related with average...

Samples of Echinocnernus squameus from 36 paddy fields are analyzed to determine its population spatial pattern in terms of pattern parameters I,C_A,I_δ,m~*/m, α and β. A negative binomial distribution with common k values is shown for both larvae and adults when the average density of adults ≥0.6 head per quadrat (1 quadrat=0.5m~2) and a complete randomness is found for adults when <0.6 head per quadrat. The dynamics of adult patchiness, such as patch size and occupied area, seems to be related with average density. The population aggregation is influenced by environmental heterogeneity when the average density is low, but mainly determined by its own behavioral custom when the density is relatively high. The aggregation intensity of larvae population and the overwintering mortality will increase with increasing intensity of tillage.

本文根据36块田的调查,用种群空间格局参数I、C_A、I_δ、m~*/m和α、β值进行分析,稻根象甲幼虫和(?)≥0.6头/样方(每样方为0.5m~2)的成虫种群,在稻田均属具公共k值的负二项分布;(?)<0.6头/样方的成虫种群则为随机分布。成虫聚块的大小和面积与平均密度有关。低密度时种群的聚集主要由于环境的异质性;高密度时种群的聚集则由本身的行为习性所致。随着耕作强度的增加,幼虫种群的聚集度和越冬死亡率增大。

 
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