It is also pointed out that clear-cutting over 1 hectare , taking soil or digging turves under canopy should be forbidden . Regeneration under canopy is very necessary in order to ensure the ecosystem stability of larch forests in valley .

并指出久久av一区，絕對禁止面積超過1hm^2的皆伐，林下取土或挖掘泥炭等嚴(yán)重影響谷地落葉松林生態(tài)系統(tǒng)的行為欧美性爱在线视频黑白配，為確保谷地落葉松生態(tài)系統(tǒng)的穩(wěn)定性久久免费色色视频，進(jìn)行林下的更新是非常必要的。

The invention relates to a canopy installation structure provided with strength of a ROPS in a working vehicle, and more particularly to a canopy installation structure which does not increase a counter weight even in a compact working vehicle having a comparatively light vehicle weight.

本發(fā)明涉及一在工作車輛中設(shè)置有ROPS強(qiáng)度的遮蓬安裝結(jié)構(gòu)久久只出精品，具體來說涉及這樣一遮蓬安裝結(jié)構(gòu)黄色网站在线观看免费观看免费，其即使在一具有相對重量輕的緊湊工作車輛中也不增加配重。

Now the studies about broad-leaved evergreen plants mainly focus on some singular elements experimentized in laboratories. The paper studies the effect of cultivation methods such as plastic canopy, shade canopy, coving ground with pine bark on cultivation environment in two year.

目前對常綠闊葉植物的研究主要集中在單因子和實(shí)驗(yàn)室內(nèi)的研究日日日射夜，而本文通過2年的觀察和實(shí)驗(yàn)99偷拍精品视频，研究塑料棚、蔭棚欧美黄色视频和网站、地面覆蓋等保護(hù)地栽培措施對栽培環(huán)境的影響5060黄片，而環(huán)境的變化進(jìn)一步影響常綠闊葉植物在冬季的越冬表現(xiàn)。

In this study, cultivation methods and treatments such as plastic canopy, shade canopy, coving ground, anti-transpirant-pretreated, pachobutrazol-pretreated, burying for overwintering is used on the several broad-leaved evergreen plants in Beijing including glossy privet, Japanese privet, Japanese holly "Convexa", evergreen euonymus "Cu zhi", wintercreeper euonymus, English ivy, leatherleaf viburnum, littleleaf box "Wintergreen", and star Jasmine.

在研究中男女做爽爽爽视频免费网站，采用塑料棚伊人夜夜、蔭棚、地面覆蓋ACG邪恶全彩邪恶帝绅士库韩国、噴施抗蒸騰劑日韩一级A片在线视频免费网站、多效唑、埋土越冬等措施和處理對北京地區(qū)幾種常綠闊葉植物——女貞在线观看91精品国产、日本女貞Ligustrum japonicum在线a黄网站、皺葉莢蓬、龜甲冬青(Ilex crenata'Convexa)黄片在线免费无码、'粗枝'大葉黃楊(Euonymus japonicus 'Cu zhi')欧美高潮喷水视频，'冬綠'小葉黃楊(Buxus microphylla'Winter-green')，絡(luò)石亚洲国产精品色一区二区三区在线、洋常春藤欧美又乱又伦观看、扶芳藤進(jìn)行了實(shí)驗(yàn)。

Base facilities greatly augment, new build steel tube big canopy 200 mus, establishment of installation sprinkling irrigation 500 mus, added apply to the small-sized agricultural machinery and implement such as machine of the rotary tillage machine that plows inside vegetable big canopy, ditcher, mist, built the vegetable workshop that pack and detect room acquired pesticide incomplete

基地設(shè)施大大擴(kuò)充国产成人男女在线观看网站视频免费，新搭建鋼管大棚200畝激情女人综合网，安裝噴灌設(shè)施500畝，增添了適用于在蔬菜大棚內(nèi)耕作的旋耕機(jī)日韩一区二区高清、開溝機(jī)日韩超清一区二区三区无码视频、彌霧機(jī)等小型農(nóng)機(jī)具，新建了蔬菜包裝車間和檢測室并添置了農(nóng)藥殘

It is he sold northeast border land this city fruit, infiltrate Russia market, it is he guides whole village to do canopy peach to help advance somebody's career, it is him oneself the nectarine canopy of many already result makes over other farmer, his purpose has only, let whole village and even fruiter of development of support of whole town farmer walk up namely become rich road.

地北頭鎮(zhèn)前山屯村的史福慶国产午夜福利电影，在遵化市有相當(dāng)高的知名度日韩免费午夜短片在线。是他將本市的水果賣到了東北邊境，打入俄羅斯市場，是他帶領(lǐng)全村搞棚桃栽培A片亚洲、欧美视频，又是他將自己已大量結(jié)果的油桃棚轉(zhuǎn)讓給其他農(nóng)戶www..com国产精品一区二，他的目的只有一個(gè)，就是讓全村乃至全市農(nóng)民依靠發(fā)展果樹走上致富路欧美一级婬片A片人杂交。

This form of canopy is more efficient than a hemispherical canopy, in that less material is required to provide equal drag.

這種形式的傘蓋更有效率比一半球形的天篷98在线视屏，在這方面較少的物質(zhì)，必須提供平等的阻力插插插插插插人人人人人人。

Through the photographic technology of fisheye lens and achieved the space image of cotton canopy structure distributing at different condition, and setupped cotton canopy structure base after image analysis. The experiment results indicated that the adaptability of different varieties to plant density is different, reasonable plant density is benefit to the raise of varieties product, and Xinluzao10 is better at high density（225000plant/ hm2） condition and Xinluzao12 is better at mid-high density（150000 plant / hm2） condition. For different nitrogen, Xinluzao10 is better at right nitrogen application amount（600 kg/ hm2） condition and Xinluzao12 is better at mid-high amount（900kg/ hm2）condition. For different irrigation, Xinluzao6 and Xinluzao12 is better at limited drip irrigation amount（1500 m3/ hm2） condition and Xinluzao8 Xinluzao13 is better at right drip irrigation amount（3000 m3/hm2） condition.

利用魚眼鏡頭照相技術(shù)獲取了不同處理棉花冠層分布空間圖象色酷色视频，對圖像進(jìn)行處理分析，建立了棉花冠層圖像庫及分析診斷指標(biāo)日日插日日干，研究結(jié)果表明欧美性猛烈粗大精品，不同品種對種植密度適應(yīng)性不同，合理的配置種植密度有利于品種的產(chǎn)量潛力的挖掘国产Av无码精品线上线下，高密（225000plant/ hm2）條件下選擇新陸早10號一级特黄免费电影网站、中高密（150000 plant / hm2）條件下選擇新陸早12號栽培種植較為適宜；對于不同氮肥用量成年妇女观看在线视频网站大全，適量氮肥用量（600 kg/ hm2）條件下選擇新陸早10號在线观看永久免费精品、中高氮肥用量（900kg/ hm2）條件下選擇新陸早12號較為適宜；對于不同灌水量在线观看国产福利，限量滴灌（1500 m3/ hm2）條件下選擇新陸早6號亚洲国产很多精品一区二区三区、12號種植較適宜，適量滴灌（3000m3/hm2）條件下選擇新陸早8號色综合天天综合网、13號種植較適宜曰本A片天天看片天天爽爽。

The relationship between rainfall intensity and interception by canopy is also very osculation. The rainfall intensity diminishes with the increase of rainfall and interception by canopy.

林冠截留與降水強(qiáng)度的關(guān)系也非常密切：降雨雨強(qiáng)越小，林冠截留量越大手机看片日韩精品视频在线，林冠截留率越高999国产一区二区三区。

So in this paper, the improved models were proposed which regarded the leaf photosynthetic trait and the light penetrating into row cucumber crop canopy heterogeneously, it is composed by the model of photon transport in heterogeneous leaf canopy and the empiristic formula which described regression between leaf age and maximal photosynthesis rate and use efficiency of sunlight.

該文所建立的日光溫室黃瓜非均質(zhì)冠層光合速率模型考慮到日光溫室黃瓜冠層內(nèi)光照分布以及葉片光合特性的不均勻性，其包含了非均勻冠層的透光模型和描述冠層葉片光合特性差異的經(jīng)驗(yàn)公式在线看片免费人成视频久网不卡。