六盘山叠叠沟小流域草本地上生物量的变化及其与环境因子的关系

根据宁夏六盘山叠叠沟小流域草地生物量的调查和实验数据，分析了该地区草地生物量的动态变化规律及其与环境因子的关系。结果表明，从坡向上看，草本总生物量的大小为：半阳坡>半阴坡>阳坡；从坡位上看，不同坡面的草地生物量差异性有所不同，半阳坡草本生物量随着坡位升高呈现增加的趋势，半阴坡和阳坡呈现出先增后减的趋势；草本生物量与0～20cm土层的土壤容重呈负相关；与土壤含水量呈正相关关系。

Variation of above-ground biomass of grasses and its relation with environmental factors in Diediegou Small Watershed of

Based on field investigation and experimental data, the variation pattern of above-ground biomass of grasses and its relationships with environmental factors in the small Watershed of Diediegou in Liupan Mountains were studied. The results indicated that there is a significant difference in the biomass of plant communities along environmental gradient, On the Semi-sunny slope,the grass biomass increased gradually with the rising elevation, On the Semi-shady slope and sunny-slope showed: the grass biomass firstly increased and then decreased with the rising elevation;Among slope directions ,the grass biomass on semi-sunny slope is larger than that on Semi-shady slope, and that on sunny-slope is the lowest biomass; The variation of the biomass had a negatively correlation of the layer of 0-20cm, and a positive correlation with soil water content.