定点观测
采用野外定点观测法，主要研究植被各个特征对风力作用及土壤风蚀的影响。
Through field investigation, the influences of vegetation characteristics on wind profile and soil erosion were main studied.
在龙门山断裂带中段的北川地区进行了土壤氡浓度随时间的动态变化定点观测。
The dynamic variation of the Radon-density in soil with the lapse of time has been obtained from surveying at fixed position in Beichuan area along the middle part of the Longmenshan fault zone.
地面巡护、了望塔定点观测、空中飞机巡护和空间卫星监测是实现林火监测的四种形式。
There are four forms of forest fire detection, and they are patrolling on the ground, observing on the watchtower, patrolling in the air and detection by the satellite from the outer space.
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