【摘要】 采用挖掘法对不同带间距灌草根系质量的空间分布格局进行研究,结果表明:全部根系与直径>0.5mm根系分布格局相似,直径≤0.5mm根系对全部根系分布格局的影响一般在近柠条带1.5m和0 cm~30 cm土层范围内,但在16m间距的影响1.5m之后;5m、10m带间距根系水平分布随远离柠条带而逐渐减少,遵从y=ax3+bx2+cx+d函数变化规律,16m带间距的呈波状变化;根系质量密度为16m间距>5m间距>10m间距;不同间距全部根系质量垂直分布随土层加深而逐渐减少,0 cm~10 cm土层根系质量与带间草本植物盖度呈正相关;5m带间距时遵从y=ae-bx函数的变化规律,10m、16m带间距时遵从y=aLn(x)+b函数的变化规律。更多还原

【Abstract】 The research is the spatial distribution structure of roots mass in Caragana and grass compound model with different spacing using digging.The results were as follows:The distribution structure of all roots and roots(D>0.5mm) were similar;The effect of roots(D≤0.5mm) on distribution structure is that the range in horizontal direction was 1.5m and in vertical direction is 30cm,but the range in horizontal direction was out of 1.5m with 16m spacing distance;The horizontal distribution of 5m and 10m distance.was decreased with the Caragana distance.The variation was like wave as distance is 16m;It could expressed by functiony =ax3+bx2+cx+d when distance was 5m and 10m.The mass density of root system were: 16m>5m>10m;The root mass of different spacing was decreased with soil depth,The root mass in 0~10cm soil was in positive correlation with the vegetation coverage;It could expressed by function y=ae-bx when spacing distance was 5m,and the function was y =aLn(x)+b with 10m and 16m.更多还原