There are lots of problems related to arid land that need to be resolved , however , the most of all are involved in the steady of the eco - environment and oasis 干旱区需要解决的课题多种多样，但最重要的莫过于生态环境及绿洲的稳定。
A pristine campsite , with no evidence of previous use , is appropriate in arid lands provided it is on a non - vegetated , highly resistant surface 在原生土地上驻营,应该找干燥没有植被并且易于恢复的地段，像岩石，碎石或沙子质地的开阔地带就是很好的选择。
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 本文通过对比，选择了在干旱区对植被覆盖度上有较好敏感性fvc指数作为本次研究的原始数据； 2
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 在原生土地上驻营[ / b ] ,应该找干燥没有植被并且易于恢复的地段，像岩石，碎石或沙子质地的开阔地带就是很好的选择。
[ 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 在原生土地上驻营[ / b ] ,应该找干燥没有植被并且易于恢复的地段，像岩石，碎石或沙子质地的开阔地带就是很好的选择。
They also note that the rocky , arid land in winegrowing regions provides farmers with few alternatives to wine production , and that the demise of vineyards could devastate the economy 他们还指出，产酒区土地崎岖不平、贫瘠乾燥，农民几乎别无选择，而葡萄园灭亡将重创经济。
Huang peiyou , lu zili , wang yuhui , 1996 . establishment of the mosouwan oasis and the variation of holoxylon deserts . chinese journal of arid land research 9 ( 1 ) : 61 ~ 67 周广胜，王玉辉，张新时， 1998 .中国植被/生态系统对全球变化反应的模式研究与展望.中国植物学会六十五周年年会学术报告及论文摘要汇编，中国林业出版社， p . 322
Developed classification systems of vegetation cover in arid land of western china , and use the changing of vegetation area of serial times to analyze the change of the vegetation in each area in arid land of western china . 5 在干旱区提出了植被覆盖度的分类体系，并使用连续时间的各类植被面积变化分析了干旱区各地区的植被变化情况； 5
Arid farmland is an important issue paid close attention to in worldwide , the arid land and semi - arid land cover about 52 . 5 percent of land in our country , whose productivity is very important for our agriculture 旱地农业是世界范围内普遍关注的重大农业问题，我国干旱、半干旱地区占全国土地面积的52 . 5 ，其生产力的高低，对我国农业生产有举足轻重的作用。
Successfully applied markov process to analyze the change of vegetation cover , and point out the change of vegetation transition is not a single markov process but a multi - markov process and also is a long term process . 9 . the writer proved that under the 8km resolution , the markov process ca n ' t estimate the trend of land use by two term - data no matter it ' s sequence or at intervals . through analyzing the change of each vegetation area , the change of spatial data and the markov process , the main conclusions are : in plain of china western arid land , the desert area decreased and the oasis area increased , most of the increase represents extension of the traditional oasis 利用回归方程对今后的植被变化情况进行了模拟预测，其结果具有一定的参考价值；南京气象学院博士学位论文8 .将马尔科夫过程成功地应用于中国西部干早区的植被变化分析当中，指出，植被的转移变化不是一重马尔科夫过程，而是一个多重的马尔科夫过程;而且是一个步长较长的马尔科夫过程; 9 .证明在8klll尺度下，马尔科夫过程不能使用两期的土地利用变化来预测土地利用的发展趋势，无论这两期的时间是连续的还是有一定时间间隔的;通过各类植被的面积变化、空间变化及马尔科夫过程分析认为:中国西部干旱区在平原区整体上荒漠面积减少，绿洲面积增加，绿洲的面积扩大主要表现在原有绿洲的扩大。
