Cultivated land quality was assessed by BP neural network in Dazu County, Chongqing. The assessment results showed that paddy lands were mainly of the second-grade and third-grade, while dry lands were mainly of the first-grade and second-grade. It illustrated the high natural quality of the cultivated land, but the natural quality only reflected land natural characteristics. Therefore, influence coefficient was used to modify natural quality index based on the investigation to households. At the same time, by using the household income as the value of cultivated land, the impact of natural quality and investment structure on the value were further discussed. The results showed that trinomial equation and binomial equation were fitted to reflect the relationship between natural quality and income.

該文采用BP神經(jīng)網(wǎng)絡(luò)模型對重慶市大足縣耕地自然質(zhì)量進(jìn)行評價91av视频第二页，發(fā)現(xiàn)研究區(qū)水田自然質(zhì)量等級以二等地和三等地為主黄片二区三区18禁，旱地以一等地和二等地為主精品日韩大片观看视频在线观看，耕地自然質(zhì)量總體偏高；但耕地自然質(zhì)量僅僅是耕地自然屬性的反映色欲又色又爽一二三在线视频观看，因此在基于對研究區(qū)農(nóng)戶行為調(diào)查的基礎(chǔ)上国产精品永久免费自在线观看，采用"影響力系數(shù)"對耕地自然質(zhì)量進(jìn)行修正，并將農(nóng)戶收益作為耕地質(zhì)量貨幣化價值的表現(xiàn)91人人摸人人干人人操，進(jìn)一步討論了耕地自然質(zhì)量和農(nóng)戶投資結(jié)構(gòu)對這種價值的影響以反映對耕地質(zhì)量的影響www.slgxq.com。

This article detailedly expatiated upon the principles, contents and methods of cropland classification; it analyzed the necessity to combine the work of cropland classification with GIS technology, summarized the attributions of ARC/INFOand some other related softwares; it established the technologic route of cropland classification supported by GIS, by a case study in Liwu Town,Li County Hebei Province, this article expatiated the practicable mechanism of combining the function of ARC/INFO with the work of cropland classification, and put forward some new ideas and approaches of utilizing GIS: this paper put forward the idea of coding the polygons in the basic graphic database such as soil map and land use map according to their attributes, and put forward the detailed coding project; based on the code databases, it expatiated upon the detailed approaches to create single梖actor map and output the final classification map; it put forward the principles and the method of creating classification units in the environment of GIS, that is how to keep the lines of soil polygon, the border of districts and the important objects such as residential areas, banks of rivers and roads ,and how to overlap single梖actor soil map and land use map, and to delete some vector lines of the overlapped map appropriately; it detailed the methods of creating mathematic model of classification coefficients in the environment of computer, and used FOXPRO6.0 programs to realize the automation of calculating coefficients; it represented the method of plotting the final map by overlapping various coverages according to the code tables and lookup tables, the process of outputting the cropland classifying map was finished by program.

本文法對耕地等別劃分的原則、內(nèi)容及方法作了較詳細(xì)的闡述黄色网站高清视频，介紹了多系數(shù)綜合修正法的耕地等別計(jì)算方法及其具體應(yīng)用和AHP的確權(quán)方法日韩视频在线免费播放；分析了耕地等別劃分工作與地理信息系統(tǒng)技術(shù)相結(jié)合的必要性，簡要介紹了地理信息系統(tǒng)軟件ARC／INFO及其他相關(guān)軟件的功能特點(diǎn)國產黃噴潮在線觀看，制定了地理信息系統(tǒng)支持下耕地等別劃分的技術(shù)路線操亚洲无码视频，通過對河北省蠡縣蠡吾鎮(zhèn)的實(shí)證研究，重點(diǎn)闡述了ARC／INFO及相關(guān)數(shù)據(jù)庫軟件與耕地等別劃分結(jié)合的有效機(jī)制及GIS應(yīng)用的一些新思想国产盗摄无遮挡裸体视频、新方法：提山了對土壤圖和土地利用現(xiàn)狀圖等基礎(chǔ)圖形數(shù)據(jù)庫進(jìn)行特征編碼的思想和具體的編碼方案嘿咻嘿咻无码免费视频，闡述了基于與圖形庫相鏈接的特征編碼表，單因素圖提取黄色视频看黄色免费网、成果圖的輸出的具體實(shí)現(xiàn)方法欧美18一19sex性外；提出了GIS環(huán)境下耕地單元劃分的原則和方法，即在保留土壤因素圖斑界線12345aa一级黄色网站、行政界線和重要地物等的原則下800av无码，將土壤單因素圖和土地利用現(xiàn)狀圖進(jìn)行拓?fù)浏B加，對疊加圖中的矢量線進(jìn)行適當(dāng)?shù)膭h除国产区影院；闡述了在計(jì)算機(jī)環(huán)境下亚洲专区欧美专区日韩专区另类，耕地分等參數(shù)計(jì)算模型建立的方法，并用FOXPRO6.0語言程序?qū)崿F(xiàn)了參數(shù)計(jì)算的自動化日韩欧美一；闡述了根據(jù)圖形庫特征編碼表和建立繪圖符號查找表人人人人干丝袜，按不同圖層疊加繪制成果圖的方法，該過程用命令程序?qū)崿F(xiàn)耕地等別圖的輸出99网一级A片在线免费播放。

Soil physico-chemical properties and variability in space and time in tillaged-layer of paddy, dry field and vegetable field in different physiognomic areas were analyzed. The variation characteristics for various soil nutrient elements in the three different types of farmland before and after twenty years were explored and compared.

不同區(qū)域間表現(xiàn)出江漢平原及鄂中丘陵區(qū)九九国产精品久久久久久，高產(chǎn)田面積大(占70％以上)，而鄂東沿江丘陵區(qū)中低產(chǎn)田所占比例大(占75％以上)少妇精品视频一区二区免费看。20年間不同區(qū)域耕地地力變化表現(xiàn)出裸体搞黄视频a淫荡，丘陵區(qū)耕地面積大幅減少，耕地質(zhì)量明顯下降日韩寂寞人妻中文字幕；平原區(qū)耕地面積雖有所減少h黄a片免费在线观看，但減幅不大，耕地數(shù)量和質(zhì)量保持基本穩(wěn)定亚洲最新无码一区二区三区91。2国产一极A片AAA毛片A片。

Analysis of the archives data of Hetian region during the Republic of China showed that this time water resources basically maintained on a stable level, and it was not the decisive factor to the waste of local big area tilth, but the essential factor actually restricted the population quantity, the reclamation wasteland scale and the overall cultivated area level in all the counties.

地區(qū)人口增長過多引發(fā)對地區(qū)耕地面積的需求擴(kuò)大另类小说激情亚洲国产，同時引起對耕地灌溉水量的增長需求擴(kuò)大，由此呈現(xiàn)出農(nóng)田灌溉水不足的表象www、一级三级黄色带片,com，造成地區(qū)人口在线播放专区、耕地水平與水資源承載力相互關(guān)系的失調(diào)；即影響和田地區(qū)耕地撂荒的關(guān)鍵是當(dāng)?shù)厮Y源總量與人口規(guī)模国产真实精品录音区、耕地面積總水平的平衡關(guān)系国产美女精品AⅤ在线观看，突破這個平衡就必然引起耕地的撂荒或生態(tài)環(huán)境劣化；而誘發(fā)耕地大面積撂荒的自然因素也與過度墾荒有一定程度的關(guān)系欧美大黑吊性交。

Recent studies indicate land fiscalization is one of the important reasons for land decrease.

研究結(jié)果表明：①土地財(cái)政與耕地數(shù)量之間存在相互反饋?zhàn)饔镁钒?9视频在线；②土地?cái)政是導(dǎo)致我國耕地數(shù)量減少的重要原因，其影響的彈性系數(shù)為-0.01乱伦小说图片视频；③土地財(cái)政對耕地保護(hù)具有正反兩方面作用：一方面国内自拍无码在线播放，土地財(cái)政刺激地方政府形成城市擴(kuò)張沖動黄色美女视频网址，導(dǎo)致耕地數(shù)量減少三级片网站免费观看；另一方面，土地財(cái)政帶來土地開發(fā)整理增加耕地面積的大幅增加精品久久久一级黄片，降低耕地減少速度免费看A片视频偷窥；④經(jīng)濟(jì)、人口和城鎮(zhèn)化等社會經(jīng)濟(jì)因素也是導(dǎo)致我國耕地數(shù)量減少的重要原因黄色视频在线免费看网站。

Results showed that:(1) soil loss from plough tillage was as much as 3~8 times that from no-tillage; the aerodynamic roughness lengths under plough and no-tillage were 0.032, 0.417, respectively.(2) No-tillage soil contained more clay and fine sand in the 0-10cm topsoil layer than the plough tillage soil. In the 0-5 and 5-10cm soil depth, the bulk density, soil hardness and soil moisture were more under no-tillage than plough tillage. Especially, the soil hardness in 0-5, 5-10 and 10-20cm under no-tillage were as much as 4.7, 2.8 and 3.8 times, respectively.

研究結(jié)果表明：翻耕農(nóng)田土壤風(fēng)蝕量是免耕地的3~8倍无码三级A在线观看，翻耕地和免耕地的地表粗糙度分別為0.032和0.417；與翻耕地相比三级国产专区，免耕地表層0~10cm土壤粘粒和粉粒含量較多永久免费的啪啪影视大全；免耕地土層0~5cm和5~10cm的土壤容重、堅(jiān)實(shí)度和土壤水分都大于翻耕地在线无码视频一区二区，其中0~5cm又爽又免费网站、5~10cm和10~20cm土層土壤堅(jiān)實(shí)度分別是翻耕地的4.7、2.8倍和3.8倍国产欧美精品图片久久久。

At last, the cultivated land spatial protection strategy by leveling and districting is put forward. Such as emphasis on the quality protection of cultivated land, protecting eco-landscape function, increasing the exploitation of reserve resource, reducing non-agricultural cultivated land occupation, strengthening the policy management, etc. Then such policy is put forward as promoting and improving the compensation system of cultivated land, carrying on the balance between quantity and quality of cultivated land.

最后，作者提出了分區(qū)的耕地空間保護(hù)策略男人看的黄色网站，并提出耕地保護(hù)不僅要保數(shù)量天天干天天碰小视频免费观看，更要保質(zhì)量，要加強(qiáng)保護(hù)長江三角洲地區(qū)耕地的生態(tài)景觀功能欧美日韩精品码免费专区、在生態(tài)環(huán)境允許的情況下亚洲欧洲中文字幕视频在线观看，加大灘涂等后備資源的開發(fā)與培育、促進(jìn)土地的節(jié)約集約利用精品一区二区三区无码视频，減少非農(nóng)建設(shè)對耕地資源的占用等耕地保護(hù)重點(diǎn)以及提出促進(jìn)完善耕地占用補(bǔ)償機(jī)制及實(shí)施耕地占補(bǔ)平衡的數(shù)量質(zhì)量平衡控制等耕地保護(hù)政策涩涩一区二区。

On the basis of numeral material and field investigations, this paper analyses the natural condition of cultivated land, social and economic condition of cultivated land, stages of cultivated land utilization, productive potentiality of cultivated land, and studies on the agriculture with regional features, intensive faming of cultivated land, a grand gathering of faming, plan faming, taking part in WTO, witch tightly related to the necessary and important of quality utilization of cultivated land.

本研究在大量收集資料和實(shí)地調(diào)查的基礎(chǔ)上扒开腿做爽爽a爽爽的视频，對福建省耕地利用的自然條件、社會和經(jīng)濟(jì)條件www啦啦啦、耕地利用階段黄色av免费观看、耕地生產(chǎn)潛力等進(jìn)行分析研究。從特色農(nóng)業(yè)欧美日韩啊啊啊爽性爱激情、耕地集約經(jīng)營與規(guī)模經(jīng)營女老师高潮喷水、耕地計(jì)劃利用、加入WTO等方面探索耕地優(yōu)化利用的必要性和重要性国内在拍视频在线播放，尋找適合福建省不同區(qū)域耕地優(yōu)化利用的途徑一级毛黄片，提出區(qū)域耕地優(yōu)化利用的模式。

By analyzing the cultivated land data from different sources in different phases after 1949,the paper considers the statistics with more errors happens during 1960-1985.According to the systematic data on land use gathered in the 1996 survey,based on reverse deduction of the cultivated land area from 1986 to 1996,and deduction of the cultivated land area from 1960 to 1985 by stages by employing yield of grain,this paper redescribed the actual changing trend and character of Chinese cultivated land and analyzed the driving force of the policy relative to cultivated land to cultivated land area change.

針對該問題不卡日本免费网址，論文對1949～2003年不同時期不同來源的耕地數(shù)據(jù)系列進(jìn)行分析a一级毛片精品免费视频A片，認(rèn)為統(tǒng)計(jì)數(shù)據(jù)存在問題較多的時期為1960～1985年，并采用糧食產(chǎn)量對耕地面積進(jìn)行了分時期的反演久久亚洲精品国产，對于1986～1996年間的耕地數(shù)量則按照全國土地利用詳查統(tǒng)一到1996年的結(jié)果再進(jìn)行反推黄色视频精品在线观看网站，由此重新刻畫建國以來中國耕地資源數(shù)量變化的趨勢和特征，并結(jié)合不同時段耕地相關(guān)政策對耕地數(shù)量變化的驅(qū)動作用進(jìn)行分析嫖妓视频。

By analyzing the cultivated land data from different sources in different phases after 1949,the paper considers the statistics with more errors happens during 1960-1985.According to the systematic data on land use gathered in the 1996 survey,based on reverse deduction of the cultivated land area from 1986 to 1996,and deduction of the cultivated land area from 1960 to 1985 by stages by employing yield of grain,this paper redescribed the actual changing trend and character of Chinese cultivated land and analyzed the driving force of the policy relative to cultivated land to cultivated land area change.

針對該難題18岁免费黄，論文對1949～2003年不同時期不同來源的耕地數(shù)據(jù)系列進(jìn)行分析，認(rèn)為統(tǒng)計(jì)數(shù)據(jù)存在問題較多的時期為1960～1985年h片免费网站，并采用糧食產(chǎn)量對耕地面積進(jìn)行l(wèi)e分時期的反演久久国产老熟女俱乐部，對于1986～1996年間的耕地數(shù)量則按照全國土地利用詳查統(tǒng)一到1996年的結(jié)果再進(jìn)行反推，由此重新刻畫建國以來中國耕地資源數(shù)量變化的趨勢和特征美日在线无码视频看看，并結(jié)合不同時段耕地相關(guān)政策對耕地數(shù)量變化的驅(qū)動作用進(jìn)行分析美国大片一级又大又粗的黑人。

arable land：耕地 耕地

arable 可耕的,適于耕種的 可耕的 Y | arable land 耕地 耕地 Y | arbor 喬木 喬木 Y

arable area：可耕地面積,耕地面積

aqueoglacial deposit 冰水沉積 | arable area 可耕地面積,耕地面積 | arable land [可]耕地,農(nóng)田

cropland：耕地

于是,人類發(fā)明了"耕地",開始在"耕地"上培育和飼養(yǎng)自身所需要的植物和動物(與現(xiàn)代意義上的耕地(Cropland)是有區(qū)別的,作者注). 這時的農(nóng)牧產(chǎn)品,雖然仍是土地上生長和發(fā)育的,但是人類的勞動已在其中起著非常重要的作用,因之稱其為農(nóng)牧業(yè)產(chǎn)品,

cropland：耕地 耕地

crop rotation 作物輪作 輪作 Y | cropland 耕地 耕地 Y | cropping system 耕作制度 耕作制度 Y

cultivated land：耕地資源

耕地資源:Cultivated land resources | 耕地資源:cultivated land | 評價:cultivated reserved land resources

tillage：耕地

till plain 冰磧平原 | tillage 耕地 | tilled land 耕地

uncultivated land：未耕地,未開墾地

uncultivated field 未耕地 | uncultivated land 未耕地,未開墾地 | uncus of vertebral body 椎體鉤

uncultivated field：未耕地

unctuous soil 松軟肥沃的土壤 | uncultivated field 未耕地 | uncultivated land 未耕地,未開墾地

agrestal：耕作地生物,耕地生物

agranulocyte 無粒白細(xì)胞 | agrestal 耕作地生物,耕地生物 | agrestis 屬于田地的,耕地的

oldland：久耕地 久耕地

oldlake 老年湖 | oldland 久耕地 久耕地 | oldmetal 廢金屬