查询词典 fertility

With 4 modes of returning land from farming to forestry in the area of returning land from farming to forestry and 5 factors of soil solution fertility in farming land in Hongya county of Sichuan province as examples, the synthesized evaluation was conducted on the grade of soil solution fertility by principal component analysis with multivariate statistics.

方法以四川洪雅退耕还林区4 种退耕还林模式和农耕地5个土壤溶液肥力因子为例，采用多元统计的主成分分析法对土壤溶液肥力等级进行综合评价。

Purpuraristatus, the growth, fertility, chromosome configuration, EST isozyme etc. were analyzed in this paper. The results showed that the growth potentiality of (E. sibiricus×E. purpuraristatus) F2 and (E. purpuraristatus×E. sibiricus) F1 were much stronger than their parents, the plant height of the former was 143.2 cm. The whole plant was reseda, the latter was 129.7 cm. The spike nodding of two hybrids were in the middle of their parents, the anther was yellow; the pollen fertility was 0.02%~0.03%, seed set was 0; the average chromosome configuration of former pollen mother cell at PMC M Ⅰ was 6.90Ⅰ+14. 02Ⅱ, the latter was 7.82Ⅰ+13.59 Ⅱ, and lagging chromosome and bridge fragment were observed at meiosis anaphase Ⅰ the EST of the two hybrids F1 and their parents at tillering stage was some certain different in locus, number and intensity.

结果表明，正交F1和反交F1植株的生长势均很强，正交F1株高143.2 cm、全株浅绿色，反交F1株高129.7 cm、全株灰绿色；正、反交F1的穗型均呈双亲中间型，花药呈黄色，花粉可育率0.02%~0.03%，结实率为0，说明杂种高度不育；正交F1的花粉母细胞减数分裂中期Ⅰ平均染色体构型为6.90Ⅰ+14.02Ⅱ，反交F1为7.82Ⅰ+13.59Ⅱ，减数分裂后期丁有落后染色体和染色体桥等不规则现象；亲本及其正、反交杂种F1分某期幼叶的EST同工酶酶带的位点、数目和强弱均存在一定差异，可作为亲本及杂种在蛋白质水平识别的重要依据。

Science , 290, 521– 523.Daehler CC (1998) Variation in self-fertility and the reproductive advantage of self-fertility for an invading plant.

本研究通过室内实验控制入侵种和本地种生长在相同的环境条件下，排除了生长环境差异对植物个体生长的影响。

In Japonica heterosis utilization, the purity of hybrid seeds was sometimes low due to the self-fertility and/or unstable sterility of some BT type Japonica cytoplasmic male sterile lines. For the WA type Japonica CMS lines, their sterility is much stable, but there is also some difficult to take use of them because their flowering habit is bad and it is very difficult to restore their fertility. The HL type CMS lines were identified to have the same flowering habit and outcrossing rate with the BT type CMS lines in Japonica hybrid rice. Moreover, the sterility of HL type CMS lines was more stable than that of BT type, and their restorable characteristics was better than that of WA type.

部分BT型粳稻不育系存在自交结实现象，不育性的稳定性较差，影响杂交种的纯度；WA型粳稻不育系虽然不育性稳定，但开花习性差，育性最难恢复，应用难度较大；HL粳稻不育系开花习性及异交结实率与BT型粳稻不育系无显著差异，育性稳定性明显好于BT型粳稻不育系，可恢复性明显好于WA型粳稻不育系，较好地协调了育性稳定性、开花习性和可恢复性几方面的矛盾。

The relationship between enzyme activity and fertility of soil in Cucumis greenhouse was studied, we attempted to use the enzyme activity of soil as an index to evaluate the fertility of soil in cucumis greenhouse.

研究了黄瓜大棚土壤酶活性与土壤肥力的关系，试图探索是否可以利用土壤酶活性作为评价大棚蔬菜土壤肥力的指标。

Inoculation of leaf on Helminthosporium Maydis Nisk and observation of anther and pollen and fertility restoration-retention identification indicated that JnA should be classified into group S of cytoplamic male sterility. At the same time, fertility observation of F2 and microscopy identification of F1 pollen through I-KI dyeing confirmed this conclusion.

首先对玉米细胞质雄性不育系JnA进行小斑病菌接种鉴定，同时对其花药、花粉形态观察，通过恢保关系鉴定，F2育性分离观察及F1花粉碘液染色镜检，初步确定JnA属于S组细胞质雄性不育。

The effects on yield and canopy biomass accumulation and distribution after anthesis of later sowing wheat were studied in different fertility levels. The results showed that each above ground organs hydrocarbonate accumulation increased with fertility level rising.

对不同肥力水平下晚播小麦开花后地上器官光合产物积累、运转和对产量影响的研究表明，开花后同一天，各地上器官光合产物的积累量均随肥力水平的提高而增加。

The fertility psychology has the objective bases of history and animate objects, and it has the necessity of not being influenced for outer conditions. But with the changes of the outer conditions, the fertility preferences can have some immaterially changes.

国民生育心理是有着其历史的、生物的客观基础，它有着不为外在条件所左右的客观必然性，但随着制约条件的变化，其生育意愿也会发生一些非实质性的改变。

Biological circulation rate of five elements in Chinese fir layer is 0.412,but they are 0.505and 0.556 in shrub and herb layers,and they show the law of herb layer＞shrub layer＞Chinese firlayer,this shows that understory plants have significant conservation function of soil fertility innutrient circulation,but Chinese fir tree species has larger consumption of soil fertility.

杉木层的5种元素总生物循环速率为0.412，而灌木层和草本层的5种元素总生物循环速率分别为0.505和0.556，表现出草本层〉灌木层〉杉木层的规律，说明林下植物在养分循环中具有明显的地力维护作用，而杉木对地力消耗较大。

But last week's conference was organized by two experts with experience in cutting － edge reproductive technology: Panos Zavos, who runs a fertility clinic in Lexington, Ky., and controversial Italian fertility doctor Severino Antinori, who helps post-menopausal women bear children.

但是上星期的会议是由具最先进生殖技术临床经验的两位专家发起的：一位是帕诺斯·扎沃斯，他在肯塔基州的莱克星顿市开了一家生育诊所；另一位颇具争议的意大利生育医生塞韦里诺·安蒂诺里，他帮助绝经后的妇女生育孩子。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。