森林生物量的估算模型
(1) 中国所有主要森林类型与木材体积的简单线性关系：
式中，y和v分别是现存生物量和现存木材体积，a和b是某种森林类型的常数。
(2) 每种类型的森林总的森林生物量可用下式计算：
式中，
和
分别是(i=1,…,31)省、位置级为(j=1,2,3)、年龄级为(k=1,…,5)平均当前木材体积和总面积。
各种森林类型以面积加权的平均生物量密度通过下式可得到：
式中，A是各类森林的总面积。
参考文献
Fang J，Wang GG，Liu G et al：中国森林生物量：根据生物量与木材体积的关系所作的估测。EcologicalApplications,1998,8(4)
Biological retention technology mainly through the matrix filtration, adsorption and microbial action to purify the infiltration of runoff rainwater. Because it can temporarily store the rain and then slowly into the surrounding soil, therefore, can play to reduce the surface rainwater peak flow, reduce runoff pollution and so on. Biological retention technology can include many forms, the more commonly used biological retention pool, concave green space, ecological grass ditch, plant buffer zone, rain garden and ecological wetlands. It can also include rainwater reuse facilities, soil improvement and so on.
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