白刺灌丛沙包生物量的预测模型

Biomass Forcast Models of Nitraria Tangutorum Shrub in Sand Dune

本文以甘肃省民勤绿洲外的唐古特白刺 ( Nitratria tangutorum)灌丛沙包为例 ,利用野外便于测定的灌丛沙包长 ( X1)、宽 ( X2 )、高 ( X3 )等指标 ,以线性回归方法 ,分别对白刺灌丛的总的生物量、地上生物量、沙包内生物量和粘土内生物量建立了回归预测模型 。

Taking Nitraria tangutorum shrub at the outside of the Minqin oasis of Gansu Province as an example,easily determined characters of N.tangutorum shrub in sand dune,such as length(x1),width(x2),and height(x3) were chosed to establish regression equation.With the method of linear regression,5 forecast models were set up to facilitate the biomass of shrub dune.These models are as fallows: Total biomass:y=0.95+1.354x 1-5.123x 2+37.52x 3 Biomass on the ground:y=-0.278+0.32x 1-1.094x 2+8.951x 3 Biomass under the ground:y=-0.672+1.034x 1-4.029x 2+28.574x 3 Biomass at internal dune:y=-0.432+0.863x 1-4.02x 2+28.204x 3 Biomass in the clay:y=-0.24+0.171x 1-0.01x 2+0.369x 3