多层随机拟合法测量样方植被覆盖度

Multilayer random coupled model to observe vegetation cover in sample areas

应用普通数码相机,以兴隆山国家级自然保护区为研究区域,在多层拟合法基础上,提出了多层随机拟合法。通过理论模型推导得出该方法误差大小由照片拍摄点数目决定;再利用实测植被覆盖度数据得出了误差-照片数目曲线,确定了误差与照片拍摄点数目的定量化关系。在满足绝对误差小于0.05的前提下,野外测量的照片拍摄点数目分别至少为:森林15个、灌丛15个、草地10个。该方法快速且精度较高,能够满足野外测量需要。

Based on the multi-layer coupled model, a new model called random multi-layer coupled model was developed with the most commonly used digital camera, taking Xinglong Mountain National Nature Reserve as field work region. An analysis of this model found that error of this method was decided by number of photos taken. With the data on vegetation cover derived from the field work, an error-photo number curve was deduced, which showed that if an error of less than 0.05 was required, the number of photos taken should be more than 15 for trees, 15 for bushes and more than 10 for grass. So this model provides an accurate and fast method in observing vegetation cover in the sample areas.