雨養農業 的英文怎麼說
中文拼音 [yǔyǎngnóngyè]
雨養農業
英文
rainfed farming-
Apart from the days when the stream was affected by external factors like rainfall, fishing and agricultural activities, the quality of water discharged to kam tin river complies with the epd s standards
除了上游因外在因素如暴雨、養魚及農業活動而水質變差的個別日子外，排入錦田河的廢水水質一直合符環保署的要求。The maximum of instantaneous global radiation is beyond 1000w / m2 and the ten - days average intensity is 338. 90w / m2 because of high atmospheric transparency over semi - arid rainfed agriculture region of loess plateau between june and august. global radiation, reflected global radiation and surface long wave radiation emerge the characteristic of daily variations on a typical clear day and cloudy day, whereas atmospheric long wave radiation has not this characteristic. meanwhile, net radiation, latent heat flux sensible heat flux and soil heat flux appear the same characteristic as the mean daily variations above spring wheat field and bare soil on a typical clear day and cloudy day
黃土高原半乾旱雨養農業區夏秋季大氣透明度較高，晴天地面的總輻射值最大瞬時值均超過1000w m ~ 2 ， 6 8月總輻射旬平均強度為338 . 90w m ~ 2 ；典型晴天和陰天總輻射、反射輻射、地表長波輻射均表現出明顯的日變化特徵，而雨天沒有明顯的日循環規律；無論是晴天、陰天還是雨天，大氣長波輻射基本沒有明顯的日變化規律。As the agricultural nfs is the most important factor for water environmental deterioration and lake eutrophication in china, more and more scientists and technologists focus on the control countermeasurc and pollution mechanism of agricultural non - point source ( nfs ). based on the investigation of natural resource and agricultural distribution, the loss rule of nitrogen and phosphorus in the typical land of qiandao lake watershed and distribution rule of the phytoplankton and physico - chemical characteristic in the lake were studied, and the input loading of nitrogen and phosphorus was also calculated by the annagnps model in this thesis. according to the routine monitoring data of the water environment in qiandao lake from 1989 to 2001, the concentrations of toxic substance and heavy metal were under the monitoring limit, but the total nitrogen ( tn ) and total phosphorus ( tp ) were much higher than the criterion for lake and reservoir
本文調查了千島湖流域的自然資源和農業生產情況，研究了典型坡地降雨徑流中的氮、磷污染物的輸出規律，利用annagnps模型估算流域農業非點源污染物輸入負荷，並在千島湖內設點采樣，對水質理化指標和浮游植物群落進行系統的研究，得出以下結論： 1989 2001年間的水環境常規監測資料統計分析表明，有毒物質和重金屬濃度長期在監測下限內， no _ 2 - n 、 no _ 3 - n 、 nh _ 3 - n年平均濃度均符合類標準，但湖泊水庫特定項目tn和tp濃度分別為超類和類，呈嚴重超標狀況，湖區主要污染因子是將導致富營養化的物質tn和tp 。Thus, establishment of sustainable agriculture on the often shallow, low fertility and sloping soils of the rainfed uplands in s e asia demands first a buildup of soil fertility
因此在東南亞雨養旱地大多是淺薄而缺乏養分的坡地土壤上建立持續農業，首先以及歸根到底是需要培肥土壤。The mean bulk momentum transfer coefficient cd and bulk sensible heat transfer coefficient ch is 3. 37 * 10 - 3 and 4. 47 * 10 - 3, which is slightly larger than that above desert gobi and grassland of plain and little than that above plateau. on one hand, the more unstable atmosphere is, the larger bulk transfer coefficients are under unstable conditions, on the other hand, and bulk transfer coefficients decrease as wind speed increases
動量和感熱總體輸送系數的平均值分別為3 . 37 * 10 ~ （ - 3 ）和4 . 47 * 10 ~ （ - 3 ） ，略高於沙漠、戈碩士學位論文:半干早雨養農業區陸面過程觀測試驗研究壁及平原草地的值，而低於高原的值;在不穩定時，層結越不穩定，總體輸送系數也越大，並且隨風速的增加而減小。Cowboys herd prime assets : beef exports earn brazil three billion dollars a year. with cattle numbers now topping 60 million, the demand for new pastureland drives much deforestation
如今，巴西每年出口牛肉的收入已經達到30億美元，農場主們飼養的牲畜達6000萬頭。畜牧業的不斷發展使得越來越多的雨林消失。95 % of water - used by agriculture come from groundwater, and it occupied 80 % of total water consumption ( 2001 ). water shortage is becoming the major obstacle of sustainable agricultural development and the key is raise efficiency of wateruse. the results of wofost model simulation showed that the yield of winter wheat was 2323 kg / hm2 under the rainfeed conditions, 5946kg / hm2 with irrigation, while the potential yield is 8485kg / hm2 with the abundance supply of light, temperature, water and fertilizer
（ 2 ）順義區農業用水的95來自地下水，農業用水占總用水量的80左右（ 2001年） ，水資源緊缺成為限制農業生產的主要瓶頸，在日趨緊缺的水資源壓力下，提高水分使用效率成為土地可持續利用的關鍵。採用wofost模型對順義區冬小麥的生產潛力及雨養條件下水分限制產量進行了模擬，結果表明：在光、溫、水、肥條件均滿足時生產潛力為8485kg hm ~ 2 ，雨養條件下水分限制產量只有2323kg hm ~ 2 。分享友人