群体密度

对晋棉10号品种9.0万～15万株·hm－25个群体密度梯度下的冠层结构、光合特性及其与干物质生产和分配的关系进行了研究。

The relationship of cotton canopy structure , photosynthetic characters , dry matter accumulation and distribution and yield of variety Jin 10 under the population density rank from 90,000 to 150,000 plants per hectare were studied .

种植制对大豆孢囊线虫群体密度和真菌区系的影响

Effects of cropping system on mycoflora and population density of soybean cyst nematode Heterodera glycines

水稻群体密度增长模型探讨&一种具有时迟效应的Logistic模型

An exploration of growth model for rice colony density & a logistic model with time-lag effect

自大白菜的根际土壤中分离得到347个细菌分离株，有40个分离株能产生群体密度信号（QuorumSensing，QS）分子，占总分离株的11.5%。

347 bacteria strains were isolated from rhizosphere of Chinese cabbage , 11.5 % of them were screened for secreting quorum sensing signal substance N-acyl-homoserine lactone ( AHL ) .

在中、幼龄杨树林地、苗圃、单一品种果园等纯林林地（果园），鸟种组成、群体密度、Shannon-Wiener多样性指数，与小麦农田生态系统一样，在17种植被类型中较低；

The species composition , the colony density and Shannon-Wiener indices of the middle-age forest and the younger growth , the nursery and the pure orchards are as lower as wheat fields in seventeen vegetations .

玉米高产栽培群体密度与性状指标研究

Study on Colonial Density and Character Index of Maize High-yielding Cultivation

紫胶虫雌成虫群体密度测算公式及其测算结果分析

The formulas for determining group density and its analysis of female adult lac insect

对在不同的肥力条件、不同的群体密度条件下，小麦的群体结构构成及产量进行了试验分析。

The wheat structures and yields in different fertility and density conditions were experimented and analyzed .

超级稻具有群体密度大，叶面积指数高，施肥量多等特点。

Super rice is characterized by high population density , high leaf area index and needing much fertilizer .

其影响表现为随着群体密度增大，茎叶夹角和角度指数有减小的趋势。

With the increase of colony density , the angle between stem and leaf and angle index have decreased trend .

在一年中，土壤中胡桃短体线虫群体密度以1月最低，10月最高。

During a year period , the lowest population density was in January , while the hightest one was in October .

并且，桃根内外胡桃短体线虫群体密度季节变化与桃根的生长节奏和温度的季节变化规律密切相关。

Both the population dynamics of P.vulnus in roots and that in soil were highly relevant to the growth tempo of peach roots .

6月初和9月中旬田间线虫群体密度分别出现一个高峰。

The two peaks of nematode population in the fields were recorded at the beginning of june and middle of September , respectively .

群体密度和追氮方法对不同熟相冬小麦产量效应的差异及对化肥氮去向的影响

Influence of density and top-dressing of nitrogen fertilizer on yield of wheat with different maturing phases and response of fate of fertilizer nitrogen

本研究通过对两个不同株型品种分别在两种不同种植方式和五个不同密度下栽培，探讨了种植方式和群体密度对玉米产量形成及品质的影响。

Two varieties with different plant types cultivating respectively under two different cultivation methods and five different densities were studied in this research .

然后采用多元线性回归训练特征向量与密度等级的关系，并确定各个特征量在密度估计中的权重，最终实现群体密度估计与分类。

Then using multiple linear regression to train the relationship between multi-features and density levels . Finally , this approach achieves density classification .

根据繁殖强度，预测各时期的种群数量，通过草原兔尾鼠种群数量动态研究，达到监测其群体密度、分布状况和预测种群大小随时间的变化与种群年龄结构的变化。

From the reproductive intensity , we can anticipate the population quantity in order to further monitor their population density , distribution and size .

因此，小麦秸秆覆盖田应适当增加播量以保证夏玉米田间群体密度。

So a higher sowing norm should be adopted in order to ensure an adequate population of maize in the field of wheat straw covering .

研究结果显示，群体密度过高或过低都不利于形成理想群体冠层和获得高产。

The experiment results indicated that both exorbitant density and too lower density of colony density are all not avail to forming ideal canopy structure and taking high yield .

高密度栽培已经成为目前玉米高产潜力挖掘的关键措施之一，但是群体密度的增加增加了玉米倒伏的风险。

The planting of high density had been one of the key measures for improving yield of maize , while the increasing of population density increased the risk of lodging .

群体密度直接影响了群体内株间漏光率与作物单位面积照光叶面积，成为影响作物最终产量的关键因素。

The size of population density directly affects the light transmittance of community plant and irradiation leaf area of unit area , to become the key factor to affects the crop yield .

此外在水稻上还进行了氮和钾施或不施厩肥和锌组合因素的辅助试验，另一试验是关于群体密度和施肥水平处理对花生产量的影响。

A satellite experiment involving combinations of N and K with and without FYM and zinc on yield production of rice and another experiment on interaction of plant population and fertilizer levels on yield of groundnut have also been conducted .

土壤中根结线虫的群体密度与作物的受害程度关系密切，因此，准确、可靠和快速地鉴定和计数土壤中的根结线虫，对该病害的有效防治至关重要。

The population density of root-knot nematodes in soil is significantly correlated with the damage degree on the host . Therefore , accurately , reliably and rapidly identifying and counting RKN in soil is critically important for the effective control of disease .

利用网络边缘中的网格数量和边缘长度作为特征，估计密集和高密集群体密度。实验结果显示，相比于现有算法，本算法估计准确率提高约五个百分点，同时算法处理速度更快。

The number of grid and length of the edge network are utilized as features to estimate crowded objects densities . Experimental results show , compared to existing methods , this approach has higher accuracy rate on dense and very dense objects densities estimation .

每亩13千株是接近理想群体的密度，其植株比较健壮，各组织面积大小均处于中间水平。

In the experiment , the density , of 13,000 plants per mu may be the density approaching the ideal population .

随群体中最大密度层的相对分布高度和风速递减指数的增大，d／h增大。

D / h increases with the increase of a ( the relative height of the maximum foliage density layer ) and γ u ( the wind extinction coefficient within canopies ) .

分别利用低密度连锁图谱和全群体以及高密度连锁图谱和子群体对大麦网斑病进行QTL定位分析，两者都能定位到一对相互作用的主效QTL。

Resistance to barley net type net blotch disease was analyzed using the sub-population data with the high-density consensus linkage map and the full-population data with the low-density SSR linkage map , respectively . Two interactive QTLs were detected either by the sub - or full-population .

群体的相对密度对其场强分布趋势起重要作用。

As a rule , the trend of spatial distribution depends on the relative density of the colony .

正态检验表明：分离群体色素腺体密度的分布为平阔曲线。

The normal test showed that the distribution of pigment gland was a flat curve in segregation population .

两种常见压力相关因子—低浓度的钙离子，增强外壳必须品，还有就是小螺群体中的密度过大—这些在野生环境下能同时出现。

Two common stressors - low levels of calcium , necessary for strong shells , and overcrowding by other snails - can happen in combination in the wild .