灌区

Taking the overall crop yields or overall net profits on the whole planned area to be maximum as the targets respectively, the paper gives calculating formulae of rational irrigation quota in accordance with that the constant term of Y=f is smaller or greater than zero and the water use coefficient of irriga...

分别以整个灌区上的总净收益和总产量最大为目标，在假定仅种植单一作物，且地力及其它因素一致的条件下，给出了与Y＝Y中的常数项a大于或小于零以及灌溉水利用系数随灌溉面积变化与否相对应的作物合理灌溉定额的计算式。

The fuzzy-optimized, multi-objective and multilevel comprehensive evaluation model for the comprehensive benefits of water resources in irrigation area was established on the premise of improving the weight vector decision method of different layers.

针对灌区水资源综合效益的评价问题，对于不同层次权向量的确定方法进行改进，构建了改进的多级多目标模糊优选评价模型。

The result shows that: The variation rhythm of the sensitivity index changed unanimously for Jensen,Blank and Stewart water production functions of spring wheat in Liangzhou city,the volume is small in the former stage,then become large at the middle stage,and less at the last stage. Jensen and Stewart water production functions are better of spring wheat in Gulang County in 1987-1989. The Variation rhythm of water deficiency sensitive index is unanimous: the volume are small at first,then large at middle,and diminish at last. The Variation rhythm of water deficiency sensitive index is unanimous in Jensen,Blank and Minhas of flax in Liangzhou county in 1987-1989. The water deficiency sensitive index in Gulang district in 1987-1989 models bad,are too many minus. 3 Establishing the non-linear model to definitive the irrigation quota and dimension of single crop,according the three prototype Precipitation,allocating the limited water optimally according to full water supply,95 percent,75 percent and 50 percent. Economy benefit is the biggest aim function,so getting three groups for irrigation quota,irrigation dimension and benefit,the biggest benefit is the most optimal result.

结果表明：1985-1986 年凉州春小麦Jensen 模型、Bl(来源：10a1ABC论文网www.abclunwen.com)ank 模型和Stewart 模型的敏感指数变化规律接近一致，在前期较小，中期增大，最后再减小。1987-1989 年古浪春小麦水分生产函数以Jensen 模型和Stewart 模型拟合较好，其敏感指数变化规律比较一致，敏感指标值前期较小，中期增大，后期又减小。1983-1985 年凉州亚麻水分生产函数以Jensen 模型、Blank 模型和Minhas 模型敏感指标值变化规律比较一致：先减小，后增大，最后再减小。1987-1989 古浪亚麻敏感指数出现负值较多，模型拟合较差。3 建立单作物种植条件下灌溉定额与灌溉面积的确定的非线性规划模型，将有限的水量按照充分供水，95%、75%和50%供水来分配水资源，以经济效益最大为目标函数，得出三组灌区灌溉面积和效益结果，其中以效益最大为最优解。

That conforms to the fact and educe that the model is reasonable and can be as the basis of the optimal water resources allocation of irrigation district

这一结果符合当地实际情况，表明所建立的大系统模型是合理的，可作为灌区水资源优化配置的依据。

Under the plain irrigation area dam floodgate washes out the destruction to be serious also the universal existence.

摘要* 平原灌区水闸闸下冲刷破坏严重且普遍存在。

The effect of long-time irrigation of petroleum wastewater on glebe microbial biomass and soil enzyme activities in Shenfu irrigation area was studied.

以土壤微生物生物量和土壤酶活性等为土壤微生物变化指标，研究了含油污水长期灌溉对东北沈抚灌区农田土壤微生物的影响。

The transport of soil water in sunflower field was simulated by HYDRUS model in Hetao irrigation area in Inner Mongolia, and thus the change of soil water in the different two periods of irrigation was distinguished significantly.

通过HYDRUS模型模拟计算了河套灌区不同灌溉时期葵花根层（0~40cm）土壤水的动态规律。

So this software can be widely used in water optimal distribution decision making of irrigation canal system.

5灌区水资源日益紧张，在水量不能满足用户所需水量时，所有用户往往希望最大限度获得自身水资源的所需量，这就很容易引起争水问题。

In a reservoir irrigation system, adjustment of water distribution in time is realized by reservoir operation, and operation of irrigation canal systems adjusts water distribution in space.

对于水库灌区，调节水量在时间上的分配是通过对水库的调度实现的，田间配水则是水量的空间分配过程。

Taking Wuliangsuhai Lake,which is a typical shallow weedy lake lies in Hetao irrigate district in the north of China,as a research object,combining the measured water quality data with the spatial data,using the method of Principal Components Analysis based on factor analysis,the water quality parameters of WL are summarized into seven principal components,namely the index ...

以位于我国北方的河套灌区中的草型浅水湖泊乌梁素海为研究对象，将实测的湖泊水质监测数据与空间数据结合，采用基于因子分析的主成分方法将乌梁素海的水质参数概括为7个主成分，即：富营养化特征指标、湖泊盐化特征指标、湖泊有机物污染指标、湖泊形态特征指标、水体酸碱指标、水体藻类生物量指标、植物生长环境指标。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。