永定河沙地是北京市面积最大的风沙化土地和风沙危害最严重的地区之一，对北京市的生态环境有重要影响。
Yongding River sand land is the largest area of wind-sand land sand and is one of the most severe wind sand damage region in Beijing, Which has important influence to eco-entironment in Beijng.
通过稳定土壤，减少水蚀和风蚀并维持土壤养分循环，林木覆盖能够防止土地退化和荒漠化。
Forests and tree cover combat land degradation and desertification by stabilizing soils, reducing water and wind erosion and maintaining nutrient cycling in soils.
因此，每逢秋天，就在寒冷潮湿的天气来临前，他总是等待湿度达到适合的水平，风向和风速适宜才燃起他那50英亩土地的某些部份。
So each autumn, before wet, cold weather leaks over the mountains, he waits for the humidity to be just right, for the wind to blow just so, and then he burns portions of his 50-acre spread.
地理信息系统(GIS)支持下的土壤信息系统(SIS)在评价土地生产能力、土地退化的现状、速率和风险以及全球变化研究中具有重要意义。
GIS based soil information system (SIS) is very important for assessment of the capacity of land production, the status, rates of soil degradation and global change studies.
他们会争取讨回世代相传的土地，并要求尊重土著居民的权利和风俗。
They will campaign for the return of traditional lands and respect for aboriginal rights and customs.
在这个由河川将“旧市街”与“新市街”分隔开的小镇，至今还流传着许多充满谜题的土地文化和风俗。
By the river will be in the "Old Street" and "New Street" separated from the town, still popular with many puzzles of the land is full of culture and customs.
在这个由河川将“旧市街”与“新市街”分隔开的小镇，至今还流传着许多充满谜题的土地文化和风俗。
By the river will be in the "Old Street" and "New Street" separated from the town, still popular with many puzzles of the land is full of culture and customs.
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