arid lands 中文意思是什麼
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The program will have to eradicate the agricultural misery in the north amazon region and northeast arid region, expect that the culture of short cycle is substituted by permanent cultures and try to construct a energy forest with native oil been plants in the amazon region where about 200 million hectares of deforested lands are degrading
他介紹了巴西的生物柴油計劃，包括扭轉巴西北部亞馬遜地區和東北部乾旱地區落後的農業，以可持續的生產方式替代短期的生產方式，並提到巴西亞馬遜地區有約2億公頃被砍伐后正在退化，有可能在這些土地上種植當地的產油作物，形成一個產能可以供應整個歐盟生物燃油需求的能源作物林。 -
A comprehensive review of the research on hydrography in arid lands in china
中國乾旱區地理水文研究概述 -
Arid and semi - arid lands
乾旱和半乾旱地區 -
Beginning from 1999, the chinese government initiated a massive conservation set - aside program called " grain for green program " to reduce soil erosion and improve eco - environmental status in western china through the retirement of sloped agricultural lands and conversion to forest arid pasture
摘要1999年我國政府啟動了「退耕還林」這一世界最大的生態保護工程，旨在改善生態環境，控制水土流失，調整農業產業結構，促進農村經濟的持續發展。 -
A pristine campsite, with no evidence of previous use, is appropriate in arid lands provided it is on a non - vegetated, highly resistant surface
在原生土地上駐營，應該找乾燥沒有植被並且易於恢復的地段，像巖石，碎石或沙子質地的開闊地帶就是很好的選擇。 -
A pristine campsite [ / b ], with no evidence of previous use, is appropriate in arid lands provided it is on a non - vegetated, highly resistant surface
在原生土地上駐營[ / b ] ，應該找乾燥沒有植被並且易於恢復的地段，像巖石，碎石或沙子質地的開闊地帶就是很好的選擇。 -
[ b ] a pristine campsite [ / b ], with no evidence of previous use, is appropriate in arid lands provided it is on a non - vegetated, highly resistant surface
在原生土地上駐營[ / b ] ，應該找乾燥沒有植被並且易於恢復的地段，像巖石，碎石或沙子質地的開闊地帶就是很好的選擇。 -
The vegetation varies from the de e tropical forests ， the mangrove forests along the coast ， to the shruberry of the arid desert lands ， to the thick mountainous forests and alpine vegetation along the slopes of the ow - ca ed mount kenya
這里的植被各種各樣，有高密的熱帶森林，沿海分佈的紅木森林，乾旱的沙漠地帶，厚密的高山森林以及高山植被，還有以雪為頂的肯尼亞雪山。 -
The vegetation varies from the dense tropical forests ， the mangrove forests along the coast ， to the shruberry of the arid desert lands ， to the thick mountainous forests and alpine vegetation along the slopes of the snow - capped mount kenya
這里的植被各種各樣，有高密的熱帶森林，沿海分佈的紅木森林，乾旱的沙漠地帶，厚密的高山森林以及高山植被，還有以雪為頂的肯尼亞雪山。 -
On the loess plateau, water is the main limiting factors for vegetation growth. root distribution characters have special ecological meaning as it reflected the utilizations of trees to the environments. even - aged stands of robinia pseudoacacia on slope lands facing south and north were selected as sampling plots for root distribution investigation. investigatiing results showed that indicated that on all sites, root biomass decreased with depth, and the distribution depth of fine root was deeper than that of coarser root. the results of variance analysis indicated that there were great differences in root biomass among different diameter classes, and coarser root was the main sources of variance, and the root biomass, especially fine root ( < 3mm ) biomass on northern exposition sites was bigger than that on southern exposition sites. analysis of the vertical root distribution parameters, root extinction coefficient, indicated that the value of on northern exposition was more than 0. 982, while the value of on southern exposition was less than 0. 982, which indicated that the vertical root distribution depth of robinia pseudoacacia on southern exposition was deeper than that on southern exposition. and the distribution depth of fine roots ( < 1mm ) was deeper than that of thicker roots ( < 3mm ), which was in favor of the uptake of water and nutrients from deeper layers, helped the trees to adapt the arid environment, and promoted the growth of the upper parts of the tree
在中國西北黃土高原地區，水分是樹木生長發育的主要限制因子.根系分佈特徵由於反映了樹木對環境條件的利用程度而具有更加特殊的生態意義.本研究選擇陽坡和陰坡不同立地上年齡一致的刺槐林調查了根系分佈特徵.根系垂直分佈特徵的調查結果表明，在所有立地上，根系生物量隨著深度的增加而降低，其中細根的分佈深度大於粗根的分佈深度.方差分析結果表明:不同立地上不同徑級根系的分佈特徵也有明顯的差別，粗根是差異存在的主要原因，陰坡立地上的根系生物量，特別是細根生物量大於陽坡立地上的.對根系消弱系數的分析結果表明，陰坡立地上的根系消弱系數大於0 . 982 ，而陽坡立地上的根系消弱系數小於0 . 982 ，說明陰坡立地上刺槐根系的生物量在深層土壤中的分佈相對量更大一些.其中細根的根系消弱系數大於粗根的，這種根系分佈特徵有利於根系對深層土壤水分養分的吸收利用，進而促進樹木地上部分的生長發育.圖3表3參15 -
Abstract : on the loess plateau, water is the main limiting factors for vegetation growth. root distribution characters have special ecological meaning as it reflected the utilizations of trees to the environments. even - aged stands of robinia pseudoacacia on slope lands facing south and north were selected as sampling plots for root distribution investigation. investigatiing results showed that indicated that on all sites, root biomass decreased with depth, and the distribution depth of fine root was deeper than that of coarser root. the results of variance analysis indicated that there were great differences in root biomass among different diameter classes, and coarser root was the main sources of variance, and the root biomass, especially fine root ( < 3mm ) biomass on northern exposition sites was bigger than that on southern exposition sites. analysis of the vertical root distribution parameters, root extinction coefficient, indicated that the value of on northern exposition was more than 0. 982, while the value of on southern exposition was less than 0. 982, which indicated that the vertical root distribution depth of robinia pseudoacacia on southern exposition was deeper than that on southern exposition. and the distribution depth of fine roots ( < 1mm ) was deeper than that of thicker roots ( < 3mm ), which was in favor of the uptake of water and nutrients from deeper layers, helped the trees to adapt the arid environment, and promoted the growth of the upper parts of the tree
文摘:在中國西北黃土高原地區，水分是樹木生長發育的主要限制因子.根系分佈特徵由於反映了樹木對環境條件的利用程度而具有更加特殊的生態意義.本研究選擇陽坡和陰坡不同立地上年齡一致的刺槐林調查了根系分佈特徵.根系垂直分佈特徵的調查結果表明，在所有立地上，根系生物量隨著深度的增加而降低，其中細根的分佈深度大於粗根的分佈深度.方差分析結果表明:不同立地上不同徑級根系的分佈特徵也有明顯的差別，粗根是差異存在的主要原因，陰坡立地上的根系生物量，特別是細根生物量大於陽坡立地上的.對根系消弱系數的分析結果表明，陰坡立地上的根系消弱系數大於0 . 982 ，而陽坡立地上的根系消弱系數小於0 . 982 ，說明陰坡立地上刺槐根系的生物量在深層土壤中的分佈相對量更大一些.其中細根的根系消弱系數大於粗根的，這種根系分佈特徵有利於根系對深層土壤水分養分的吸收利用，進而促進樹木地上部分的生長發育.圖3表3參15 -
All the animals live in open lands, but their habitats can range from arid desert to grassy plains favored by moderate rainfall
雖然所有的野生馬都分佈在空曠土地上，但是這些地區從乾燥的沙漠，到有溫和雨水滋潤的青青草原都有。 -
Groundwater resources and their characteristics in arid lands of northwestern china
中國西北乾旱區的地下水資源及其特徵 -
So the main purpose of this research is use time series, by the means of rs ( remote sensing ) and gis ( geographic information system ), on the groundwork of preciser classification data, to understand the change of different types of vegetation cover in the western arid lands in china, and to forecast future trend of the eco - environment of different areas. 1
因此本研究的主要目標就是利用長時期的遙感數據，以rs （ remotesensing ）和gis （ geographicinformationsystem ）為工具，在相對準確分類的基礎上了解1982 2000年期間中國西部乾旱區不同植被覆蓋度的時空分佈、面積變化，並對各區域的生態環境發展趨勢作出一定的預測。 -
In this article, choose the fvc index for originals data which has great sensitivity to vegetation cover rate in arid lands as an environmental indicator ; 2
本文通過對比，選擇了在乾旱區對植被覆蓋度上有較好敏感性fvc指數作為本次研究的原始數據； 2
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