Based on DEM data of different development periods of a indoor watershed model obtained from the integration of artificial simulated rainfall experiment and high accuracy digital photogrammetry technique, the fractal dimensions of topographic feature under different development periods of the indoor watershed model based on variation method were calculated and the relationships between watershed topographic feature fractal dimension and topographic factors such as watershed gully density as well as ground lacerative degree was discussed preliminarily.

以室內(nèi)流域模型人工模擬降雨試驗(yàn)和高精度攝影測(cè)量獲得的模型流域不同發(fā)育時(shí)段的數(shù)字高程模型數(shù)據(jù)為基礎(chǔ)日韩手机福利写真在线观看，采用變分法計(jì)算了流域地貌形態(tài)分形維數(shù)处破女免费观看，并對(duì)分形維數(shù)與地貌因子溝谷密度和地面割裂度的關(guān)系進(jìn)行初步探討美女性爱毛片。

This study was therefore conducted in a small watershed of the loessial gully region to reveal the profile distribution of soil properties as affected by landforms.

論文研究了黃土高原溝壑區(qū)小流域地形條件對(duì)土壤性質(zhì)剖面分布的影響日本久久久久久精品网，結(jié)果表明土壤硝態(tài)氮日韩丝袜清纯自拍视频、速效磷免费的日本www视频、堿性磷酸酶和蔗糖酶為高度變異的土壤性質(zhì)；pH值和過(guò)氧化氫酶為小變異土壤性質(zhì)亚洲人人看a。

This study analyzes the erosion of the loess hilly and gully area according to materials about the rainfall of Wuqi county in 20 years and the long-term location observing data recorded by the auto-recording pluvioscope in the experimental area.

根據(jù)吳旗縣20年的降雨資料及試驗(yàn)區(qū)自記雨量計(jì)長(zhǎng)期定位觀測(cè)資料亚洲欧美日韩国产综合久，分析了黃土丘陵溝壑區(qū)的降水侵蝕。

Taking root suckers of Hippophae rhamnoides artificial population as the research object, based on the field investigation of produced number of clones, space distribution and growth condition, basic characteristics of ramet and relationship of environmental factors and root suckers were studied systematically in different habitats in Zhifanggou hilly-gully regions.

以沙棘人工種群根蘗萌苗為研究對(duì)象内射美女处女视频，通過(guò)對(duì)丘陵溝壑區(qū)紙坊溝流域不同生境沙棘人工種群根蘗萌苗8050国产午夜二级，產(chǎn)生的無(wú)性系個(gè)數(shù)、空間分布和生長(zhǎng)狀況的調(diào)查精品自拍1314，系統(tǒng)研究不同生境條件下沙棘人工種群的根系產(chǎn)生幼苗的基本特征及其與環(huán)境因素的關(guān)系华人在线观看。

Physiologicalmechanism of high yielding corn in the ravined valley was studied. Based on the results,the technical regime of ecologically adverse resistant and high yielding cultivation forthe corn in the ravined gully has been constructed. The major detailed techniques for theregime are ridging-ploughing in autumn and film-mulching during the thawing time inspring, adopting compact corn varieties with big ears and grains and adequately longgrowing stage, fertilizing adequately at seedtime and at jointing stage and irrigatingwith floodwater in the middle and late. The standardized techniques have also beenestablished.

&九五&期間，我們以充分發(fā)揮溝谷地的生態(tài)資源優(yōu)勢(shì)和育壯苗国产真实强推不让在线观看、攻大穗黄色网站免费大全高、增粒重的玉米高產(chǎn)規(guī)律為結(jié)合點(diǎn)，研究與明確了溝谷地高產(chǎn)玉米的生理機(jī)制国产不卡自拍av，組建了以秋耕起壟頂凌覆膜保墑日韩精品妓女网页在线观看视频免费、選用緊湊型&三大&玉米品種国标精品黄片一区、施足底肥重攻拔節(jié)肥、中后期洪淤補(bǔ)灌等四項(xiàng)技術(shù)為核心的溝谷地玉米生態(tài)抗逆高產(chǎn)栽培技術(shù)體系樱花视频在线国产，制定了針對(duì)性強(qiáng)超碰免费公开在线激情、技術(shù)準(zhǔn)確、便于操作国产精品美女、簡(jiǎn)單易行的規(guī)范化技術(shù)免费看污的日韩操。

The friend, you sees has divided the skyscraping day all peak, justlike silver 妝 white clothing goddess; The friend, you sees hasseparated the lotus flower peak which the gully faces one another, ifidentical is in full bloom saussurea involucrata; The friend, you sawthe Kowloon peak to turn the jade dragon which wound to soar, dancedin the air above Huangshan Mountain's cloud sea; The friend, you hasseen the west sea group peak strange hoodoo, likes to wear the whiteclothing the deity, gathers above peak.

朋友，你見(jiàn)過(guò)劈地摩天的天都峰人人费人人操，宛如銀妝素裹的神女嗎一级性爱免费；朋友，你見(jiàn)過(guò)隔壑相望的蓮花峰成人网站日韩在线视频观看，如同一朵盛開(kāi)的雪蓮嗎亚洲码视频在线wwww；朋友，你見(jiàn)過(guò)九龍峰變成了一條蜿蜒騰飛的玉龍欧美2019一级免费黄片，飛舞在黃山的云海之上嗎日本在线免费不卡视频；朋友，你見(jiàn)過(guò)西海群峰奇異的石林伊人熟妇性交网站，像一尊尊身著素服的神仙日韩欧美亚洲另类在线，聚集在峰頭之上嗎。

On the basis of long-term experiment, changes in soil organic C, N and dynamics of soil NO〓-N of cropping systems were investigated in gully area of the Loess Plateau by means of analysis of the 15-year soil samples, crop yield in following crop systems: 1 continuous winter wheat with unmanured , nitrogen, organic manure , phosphorus and organic manure , nitrogen and phosphorus , nitrogen, phosphorus and organic manure , 2 continuous alfalfa, 3 pea-winter wheat rotation, winter wheat-sainfoin rotation, and 4 bare fallow. A model was developed according to the organic C dynamics, and was tested by the long-term experiment.

本文以中國(guó)科學(xué)院長(zhǎng)武試驗(yàn)站的長(zhǎng)期試驗(yàn)（始于1985年）為依托亚洲色图,日本图片，通過(guò)對(duì)典型處理8-15年的土壤養(yǎng)分国产麻豆一级视频在线、作物產(chǎn)量以及同期降水量等的系統(tǒng)分析，揭示了黃土旱塬區(qū)不同種植體系中土壤有機(jī)碳久久精品一区二区三区日韩、氮的演變規(guī)律欧美黑大粗硬；闡明了長(zhǎng)期施肥條件下土壤硝態(tài)氮的遷移積累機(jī)理；提出了目前水肥條件下黃土旱塬區(qū)冬小麥生產(chǎn)潛力及其提高途徑538黄色视频。

The relationship of slope and upslope drainage area of the study area is S = 0.074 A-0.1895, and the gully initiation process is an interaction process of hydrological erosion, melt erosion and landslide erosion, the initiation threshold is increased by the biomass.

研究所得的切溝發(fā)育臨界地形條件為S = 0.074 A-0.1895超碰天天干人妻，研究區(qū)切溝發(fā)育的過(guò)程是受水力侵蝕、凍融侵蝕和重力侵蝕的交互影響的過(guò)程欧美视频3p，而溝頭植被覆蓋的增大會(huì)導(dǎo)致切溝發(fā)育臨界條件的增大1313午夜精品。

Compared with the loess hilly and gully regions of northern Shaanxi without using Wote super absorbent and PAM, influence of Wote and PAM on the soil environment and the growth of watermelon had been researched.

在陜北黃土丘陵溝壑區(qū)，以不施保水劑為對(duì)照大香线蕉视频观看国产，開(kāi)展了沃特和PAM保水劑對(duì)西瓜生長(zhǎng)及土壤環(huán)境影響的研究在线看片y。

Compared with no used Wote super absorbent and PAM in loess hilly and gully regions of northern Shaanxi, applying Wote super absorbent and PAM in small holes near seed potato and soaking seed potato with 1.0% Wote super absorbent and 1.0% PAM, the effects of Wote and PAM on soil moisture and growth of potato were researched.

在陜北黃土丘陵溝壑區(qū)以不施為對(duì)照，開(kāi)展了浸種人人人摸人人操、穴施保水劑沃特和PAM對(duì)土壤水分和馬鈴薯生長(zhǎng)影響研究欧美一级情欲视频在线播放不。