冀北山地阳坡草本植被层与土壤因子的关系

The Relationship between Herbaceous Biomass and Soil Factors of Sunny Slopes in the Mountains of Northern Hebei

为了解土壤对山地草本植被层发育的影响,以冀北山地的干旱阳坡为研究对象,研究了草本植物生物量、草本植物多样性与土壤因子的相关关系。结果表明:草本层生物量与草本层的高度之间具有明显的相关关系(r=0.649,P<0.01,n=132);草本生物量与土层厚度具有明显的正相关关系(r=0.351,P<0.01,n=132),而与石块覆盖度具有明显的负相关关系(r=0.297,P<0.01,n=132),但与土壤养分含量之间不存在显著的相关关系。草本物种丰富度与土壤全氮以及速效磷含量之间具有显著的负相关关系,而与土壤有机质、碱解氮、全磷含量也呈负的相关关系,但未达到显著水平。由此得出结论,土层厚度是影响冀北山地干旱阳坡草本植物层生物量的主要因素,土壤养分含量不是草本植物层发育的限制因素,高的土壤养分含量导致物种丰富度下降。

In order to study the influence of soil characteristics on herbaceous vegetation layer in mountains,the correlation between herbaceous biomass,herbaceous plant diversity and soil factors in arid sunny slopes of mountainous areas in northern Hebei was studied.The results showed a clear correlation between the herbaceous biomass and herbal height( r =0.351, P <0.01, n =132);herbaceous biomass and soil thickness has a significant positive correlation( r=0.351,P<0.01,n=132)(P <0.01),herbaceous biomass and stone coverage has a clear negative correlation( r=0.297,P<0.01,n =132),but no significant correlation with soil nutrient.There was a negative correlation between species richness and soil nutrients,but it was significant only for total nitrogen,available phosphorus content.It is concluded that the soil thickness plays a great role in herbaceous biomass in arid sunny slopes of mountainous areas,and soil nutrient is not the limiting factors in herbaceous production,while high soil nutrients lead to decrease in species richness.