耕地

Infield was the soul of land resources, infield resources safety was the core status of country safety.

耕地是土地资源的精华，耕地资源安全居于国家资源安全的核心地位。

Based on it, the using rate of production potential of different infield was calculated and the field production potential fators of this area were analyzed.

在此基础上计算了各层次的耕地生产潜力利用率，对影响该地区耕地生产潜力的因子进行分析。

First of all, it explains the understanding of cultivated land conservation intension and the basic theories of it.

首先，阐述对耕地保护内涵的认识以及耕地保护的基本理论。

We make a study of the Baiqiang County in China, and we find that China is in a speedup stage of industrialization course. The reduction of the farmland is the ascent stage of the inverse U curve, and the reduction of the farmland will continue.

通过研究发现，中国目前处在工业化的加速时期，耕地的减少速度也处在倒U形的上升阶段，耕地减少趋势还将持续，尚未达到最高点。

It is necessary to train the already known annual reduction quantity of arable land resources in Shaanxi Province through BP nerve network ＆ to establish a forecasting model for this reduction according to time order.

采用MATLAB软件建立用于预测的BP神经网络，将已知陕西省的耕地资源年减少量通过BP神经网络进行训练，建立陕西年耕地面积减少的时间序列的预测模型。

Multiple cropping system is a special characteristic of agriculture in China, which has crucial function on feeding 22% people of the whole word by 10% cultivate field of the whole world.

中国农业能以占世界 10%的耕地养活世界上 22%的人口，多熟种植起着决定性的作用。复种指数作为耕地耕作能力的主要指标以及气候农业生产模型中的必需变量，一直是基于行政单元的统计，存在较多的问题，不易于评价与研究。

This study proposed a new method for extracting multiple cropping index on pixel level with multi-temporal moderate-resolution imaging spectroradiometer enhanced vegetation index data based on the crop phenology and decision tree. The method could be divided into two steps.

该文通过深入分析农作物的农时历和耕地的时间序列植被指数曲线的对应关系，提取了反映作物种植模式的特征时相，并以特征时相的EVI值作为特征参量，构建了提取耕地复种指数的决策树方法。

To study the area crop distribution and the plan disposition analysis indicated that in 21.99 hm2 type area total cultivated area,the current planters beet,the naked oat,the potato,reached the proportion which occupies with the corn and the red kidney bean five crops respectively was 32.93%,36.88%,5.39%,5.61%and 19.19%;Choosed the region symbolic soil fertility target 0～10 cm surface layer soil the physical property clay content to carry on the farmland regionalization altogether to divide into 4 levels:The 1st level, soil physical property clay content＞30%;The 2nd level,25～30%;The 3rd level,20～25%; The 4th level,＜20%.,Showed that the plots 1～4 the proportion of cultivated land were 3.32 percent and 26.39 percent,32.16 percent and 38.13 percent.

对研究区作物分布与规划配置分析表明，在21.99hm~2样区总耕地面积中，当前种植的甜菜、莜麦、马铃薯、饲用玉米和红芸豆五种作物所占的比重分别为32.93%、36.88%、5.39%、5.61%和19.19%；选择区域标志性土壤肥力指标0～10cm表层土壤的物理性粘粒含量进行农田区划共分为4级：第1级，土壤物理性粘粒含量＞30%；第2级，25～30%；第3级，20～25%：第4级，＜20%。，表明该样区1到4级耕地所占的比重分别为3.32%、26.39%、32.16%和38.13%。

To encourage tap the potential of rural construction sites, or sites of the original rural village and township of collective construction land came into farmland, the provincial land and resources management review found, the building could be occupied farmland to the state for additional indicators.

为鼓励挖掘农村建设用地潜力，对将原有农村宅基地或村、乡集体建设用地复垦成耕地的，经省级国土资源管理部门复核认定后，可以向国家申请增加建设占用耕地指标。

Our country is a agriculture country,cultivated land is the important land resource,do cultivated land protection well has great relationship with our common people,and is important to implement ology evolution and design harmonious society.

我国是农业大国，耕地是我国重要的土地资源，做好耕地保护关系到社会民生，同时也是实现科学发展观、构建和谐社会的需要。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。