陕北沙区人为因素与沙漠化的定量关系研究

陕北沙区是农林牧工矿交错出现的典型的生态脆弱区,很大程度上代表了中国半干旱、干旱沙区的人类活动与环境相互关系中的许多典型问题,开展该区的沙漠化和人为影响研究具有十分重要的意义。经统计相关回归分析,发现该区人为因素与沙漠化间存在以下定量关系,人口增长幅度、垦殖指数、年均林业产值和年均造林面积各自与沙漠化指数间的线性回归方程分别为:Y=1.0437X-0.2836(R=0.7846)、Y=-0.036X+0.6687(R=-0.8772)、Y=0.0008X-0.2555(R=0.7606)、Y=0.0275X-0.2619(R=0.9398)。这些定量关系反映了人口、耕地和林业因素与沙漠化间的关系,能在一定程度上反映人为因素对沙漠化的影响。

Research on Quantitative Relations Between Human Factors and Desertification in Northern Shaanxi Sandy Area

Northern Shaanxi sandy areais a typical vulnerable ecological area where agriculture, forestry, animal raising, industry and mining existed. To great extent, it represents many typical problems in the relations between human activities and environment in Chinese semi-arid and arid sandy areas. There is very important significance to research on desertification and human influence. Through statistical relevance and regression analysis, there exists following quantitative relations between human factors and desertification in the area. The lineal regression equations respectively between desertification exponent and increase range of population, sowing exponent, annual mean forestryproduct and annual mean forestation area are Y=1.0437X-0.2836(relevance coefficient is 0.7846), Y=-0.036X+0.6687(relevance coefficient is -0.8772), Y=0.0008X-0.2555(relevance coefficient is 0.7606), Y=0.0275X-0.2619(relevance coefficient is 0.9398)separately. These quantitative relations reflect the relations between population, sowing land, forestry factors and desertification and can reflect the effect of human factors on desertification to some extent.