查询词典 canopy

On the basis of observation on the incident and transmitted photosynthetically active radiation of the winter wheat canopy under the monoculture and intercropping ways, the diurnal change of interception photosynthetically active radiation, the relationship between IPAR and leave area index, and the shading of the winter wheat were studied.

文章摘要：通过对单作和间作种植模式下作物冠层入射和透射光合有效辐射的观测，研究了不同种植模式下冠层光合有效辐射截获量的日变化规律及其与叶面积指数的关系以及冬小麦对预留行的遮荫作用。

It is crucial that the calculated value approximates the actual value of canopy absorbed photosynthetically active radiation. The calculation accuracy directly influences the estimation of NPP and carbon cycle.

FAPAR模型是否能真实反映植被冠层吸收光合有效辐射状况，将直接影响遥感估算植被NPP和碳循环的准确性。

In the submodel, the reflection coefficient of the canopy changed with the sine of the solar angle and the relationship between the extinction coefficient for photosynthetically active radiation and PDT was quantified.

模型引入高斯积分法简单有效地计算冠层每日的总光合量，并考虑了冠层辐射反射率的日变化及消光系数随生理发育时间的变化，使模型对冠层辐射吸收与光合作用的定量更加准确。

In this study, based on the Rnl, extinction coefficient k, transition coefficient of canopy layer stomatic resistance K', aerodynamics resistance ra and rc calculated with the data of Rn, LAI, rsi, the daily transpiration variation of Picea purpurea, Larix principisrupprechtii, Hippophae rhamnoides ,Betula platyphylla and Populus cathayana were studied in Datong County, Qinghai Province. Comparing with the practical transpiration variation measured by Li1600 Steady Porometer, the relative error of this model was less than ±15%, and the results were stabilized and tested by precision analysis.

本研究通过对Rn、LAI、rsi的实地观测，确定了林冠截流净辐射、消光系数、冠层阻力转换系数、空气动力学阻力和冠层整体气孔阻力，对青海大通地区紫果云杉、华北落叶松、沙棘、白桦和青杨的日蒸腾过程进行了模拟，与用快速称重法订正的Li1600稳态气孔仪实测蒸腾结果对比，模拟的相对误差在±15%以内；模型敏感性分析发现，温度、LAI以及rsi是决定模拟结果的主要参数，模型对各参数变化反应不敏感。

The effect of fertilizer application on the growth and development of summer maize and the absorption, distribution and remobilization of Nitrogen, Phosphorus, and Potassium were investigated in field-grown conditions from 1997 to 1998, as well as the response of photosynthesis to eco-physiological factors in the corn canopy caused by different fertilizer amounts were explored.

4.1.1 对土壤速效养分含量的影响 19-224.1.2 对植物养分含量的影响 22-234.1.3 对产量的影响 23-244.2.1 对土壤速效养分含量的影响 24-254.2.2 对植株养分含量的影响 25-264.3.1 氮素吸收动态 26-274.3.2 磷素吸收动态 274.3.3 钾素吸收动态 27-284.3.4 氮磷钾在植株中的分配和转移 28-304.4.1 氮素吸收动态 30-314.4.2 磷素吸收动态 31-324.4.3 钾素吸收动态 324.4.4 氮磷钾在植株中的分配和转移 32-34

A flap that covers an entrance or forms a rooflike extension for a tent or the canopy of a vehicle.

帐篷的双层罩子：盖住入口的帘子或遮挡帐篷或汽车顶篷的屋檐状覆盖物

On the basis of summarizing the application of the Penman-Monteith model in forest underlying surface, the evaluating method and significance of many parameters were expounded. The calculating methods of the key parameters were discussed including net radiation, aerodynamics resistance and canopy layer stomatic resistance, some problems were analyzed and some suggestions were given for practical application of this model in forest evaportranspiration research.

中文摘要： Penman—Monteith公式是在蒸散研究中应用最多，也是变化形式最多的方法，该文在对目前Penman—Monteith模型在森林下垫面中应用总结的基础上，阐述了其中众多参数的意义和常用的确定方法，着重探讨了影响该模型精确性的关键因子净辐射、空气动力学阻力和冠层阻力的计算方法，并分析了Penman—Monteith模型在实际应用中存在的一些问题，提出了该模型在今后森林蒸散研究中发展的思路。

The result showed that 6 kinds of soil enzyme activities and soil microorganism quantity under the canopy of Tamarix spp.

灌丛，选择典型样株按水平方向和垂直方向分别取土样，测定了6种土壤酶活性及细菌、真菌、放线菌数量。

The disease severity decreased as light transmittance ratio of the canopy at heading increased. The LTR, Tav and RH explained 80.2% of variation in disease severity.

纹枯病病情指数随着抽穗期群体透光率的提高而下降，由日平均温度、相对湿度和抽穗期群体透光率可以解释纹枯病病情指数变异的80.2%。

Tricholoma valuable direct consumption of fungi, which canopy hypertrophy, fragrance palatability, unique flavor, was called "Su-in the meat."

口蘑是直接食用的名贵真菌，它伞盖肥厚，清香适口，独具风味，被人们誉为&素中之肉&。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。