塔里木河中游地区柽柳地下生物量研究

Study on Underground Biomass of Tamarix ramosissima in the Middle Reaches of Tarim River

以塔里木河中游植物群落中的建群种多枝柽柳为研究对象,研究地下生物量现状、地下生物量空间分布格局及地下与地上生物量的相关性。研究结果表明,柽柳总生物量约为28.06 kg/m2,约19.7%分布在地上部分,为5.53 kg/m2;根系生物量占80.3%,大约为22.53 kg/m2。柽柳群落的地下生物量与土壤深度负相关,即随土层深度的增加而减小。地下生物量的峰值分布于0～40 cm,约为根系总生物量的38.7%。该研究区柽柳地下与地上生物量回归方程:y=-0.249x2+6.624x-1.356,R2=0.674。可见,地上生物量可解释地下生物量变化的67.4%。在涉及不同研究区域或不同空间尺度的研究时,还需要大量的实测生物量数据对方程进行重新拟合。

The underground biomass status,vertical distribution and its relationship with aboveground biomass of Tamarix ramosissima in middle reaches of Tarim River was studied.The results showed that： the biomass of Tamarix ramosissima was 28.06 kg / m2,among which 19.7% was aboveground biomass（5.53 kg / m2） and 80.3% was underground biomass（22.53 kg/m2）.Underground biomass decreased with soil depth,and the maximum of underground biomass was found in 0-40 cm（38.7%）.The regression equation of underground and aboveground biomass is y =-0.249x2 ＋ 6.624x-1.356,R2 = 0.674.It was clear that aboveground biomass could explain 67.4% underground biomass variation.When referring to research at different spatial scales in different zones,we needed a large number of actual biomass data to fit equation again.