耕地

Cultivated land allowance is determined based on the prediction of the increased quantities and decrement of cultivated land.

在未来耕地增加量和减少量因素数量预测的基础上，确定了未来耕地的可供给量。

Because of variability of natural and economic characteristics in different areas, current evaluation on cultivated land fertility adopts different evaluation index systems, these lead to incompatibility of evaluation results and discommodity for utilization, management and protection of cultivated land.

由于不同区域间自然和社会经济因素的巨大差异，目前耕地地力评价工作中，不同地区往往采用不同的评价指标体系，使评价结果难有可比性，给耕地的利用管理和保护工作带来不便。

As the land consolidation goes in a deep-going way, it not only plays an important role of increasing quantity of the land resource and improving quality of the soil. But it exposes some questions in real practice, especially in discoordination between planning of some department and allocating funds for new projects.

近年来，土地整理在提高耕地质量保持耕地的动态平衡中扮演了越来越重要的角色，但在实践中也暴露了一些问题，这其中，与各部门的规划以及在资金上的协调配合不理想显得比较突出。

In fact, cultivated land classification is a research to reveal the quality of cultivated land and the law of spatial distribution.

耕地分等的实质是一项揭示耕地质量高低及其在区域内空间分布规律的研究工作。

The arid and semiaridfarm belt is about 52.5％of the earth land in our country, among which the plowlandis 51 million hm~2 and is about 51％of all plowland in our country. The dry landwithout irrigation is about 65％of the and and semiarid farm belt.

我国干旱、半干旱农业区约占国土陆地面积的52.5％，其中耕地5100万hm~2，约占全国总耕地的51％，干旱、半干旱农业区没有灌溉条件的旱地占到了65％。

Main loss of cultivated land is submerged by flood or dug to fishpond. Inferior loss of it is to city building.

江夏区的耕地减少主要是洪水淹没及开挖渔池所致，城市扩展所造成的耕地建设的数量并不大，但却是不可逆变化。

The result shows that the human activities are the dominant factors led to arable land and forestland area changing.

同时，建立了耕地、林地面积变化与主要驱动力因子之间的多元线性回归模型，回归模型的系数很好地解释了各因子对耕地、林地面积变化的贡献率。

Results indicate that:(1) by using HANTS, the researchers could get the EVI/NDVI harmonic curves, the mean VIs and the amplitude of the harmonics which then were utilized in the identification of the cultivated land, and EVI appeared to be more precise, with the overall accuracies of 97.17% and 95.99% and Kappa coefficients of 0.7938 and 0.6518, respectively.(2) Multiple cropping index was extracted by counting the number of the curve's peak; and when the threshold of the peak value of the NDVI and EVI curves were set as 0.25 and 0.20, respectively, the fallow land could be well figured out.(3) From harmonic curves, some eigenvalues, such as time of the maximum growth rate, time of peak and the value of peak can be extracted, based on which the crop types can be primarily distinguished. And EVI still performed better than NDVI in this section.

结果显示：（1）利用傅立叶谐波变换得到的EVI和NDVI时间谱曲线的谐波余项及谐波振幅对耕地进行识别，从识别精度来看，EVI要优于NDVI，识别精度分别为97.17%和 95.99%，Kappa系数分别达到0.7938和0.6518；（2）通过计算时间序列曲线的波峰数能够提取耕地的复种指数，并且在EVI和NDVI曲线波峰阈值分别设为0.20和0.25时，休耕地能较为准确地被识别出来；（3）通过提取作物生长期内曲线的VI最大增长速率时间点以及峰值时间点等信息，作物种类能被初步识别，并且EVI较NDVI具有更强的识别能力。

Their indiscriminate digging of arable land for thousands of years in the clay brick-making in the production mode, and the use of local piling up Meigandan brick-making, saving a lot of farmland; Meigandan hypergolic use heat generated from the sinter completed Meigandan process saving a lot of energy; Use of the process used to bake the residual heat for drying of repression to the germ, settled weather brought drying bricks, cool bricks difficulties.

他们突破了千百年来滥挖耕地用粘土制砖的生产方式，利用当地堆积如山的煤矸石制砖，节约了大量耕地；利用煤矸石自燃产生的热量完成了煤矸石转的烧结过程，节约了大量能源；利用烧制过程中产生的余热对压制的转胚进行烘干，解决了因天气影响带来的晒砖、凉砖的困难。

Coordinate the principle with the balance according to population , resource and environmental photograph , pass understanding western the fundamental condition of area land natural resources , analysis western the land that area land natural resources is faced with bears the weight of power excess load , population crosses the rapid growth , destruction that brings about zoology environment incontinently , the problem such as the contradiction that farmland protection and urban progress , infrastructure builds , unscramble western protectionism of natural resources of big development land , put forward land tax to expend policy and infrastructure to take up the proposal such as the compensation policy of farmland .

根据人口，资源与环境相协调和平衡的原则，通过了解西部地区土地资源的基本状况，分析西部地区土地资源面临的土地承载力超负荷，人口无节制的过快增长，导致生态环境的破坏，耕地保护与城市发展，基础设施建设的矛盾等问题，解读西部大开发土地资源保护政策，提出土地税费政策和基础设施占用耕地的补偿政策等建议。

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。