干旱区土壤生态系统主导因子的灰色关联识别

GREY RELATIONAL GRADATION OF THE LEADING FACTORS IN SOIL ECOSYSTEM ON ARID AREA

本文应用灰色系统理论—灰色关联识别原理和方法,探讨干旱区土壤生态系统的主导因子识别。结果表明,此法简便易行,符合客观实际,作为常规因子分析法的补充和完善是有意义的。11个土壤因子对箭杆杨胸径生长影响的关联序依次为: 粉粒(r_8)>速效磷(r_4)>孔隙度(r_(11))>速效钾(r_6)>容重(r_(10))>PH(r_7)>粘粒(r_9)>速效氮(r_3)>全氮(r_2)>全盐(r_6)>有机质(r_1)}(?){0.616>0.546>0.514>0.507>0.506>0.491>0.487>0.449>0.447>0.443>0.420};对箭杆杨树高生长影响的关联序为: 粉粒(r_(?))>速效磷(r_4)>容重(r_(10))>速效钾(r_5)>孔隙度(r_(11))>PH(r_7)>粘粒(r_9)>全盐(r_6)>速效氮(r_3)>全氮(r_2)>有机质(r_1)}。其影响程度以粉粒含量为主,土壤速效磷次之。

The leading factors of soil ecosystem in arid area are discussed based an the application of the principle and method of grey relational gradation, the important part of grey system theory. The results show that this method is feasible and easy to operate. The analyzed results were in a good agreement with the actural conditions. It can be used as a suppermental and perfectible method for analyzing the common soil factors. The result of gradation shows that the relational order of 11 soil factors affected the circum growth of populus nigra var. thvestina bean is: {r_8>r_8>r_(11)>r_5>r_(10)>r_7>r_9>r_3>r_2>r_5>r_1}(?){0.616>0.546>0.514>0.507>0.506>0.491>0.487>0.449>0.443>0.420}, Successively. And that of the populus nigra var. thvestina bean is: {r_8>r_4>r_(10)>r_5>r_(11)>r_7>r_9>r_6>r_3>r_2>r_1}(?){0.574>0.527>0.514>0.500>0.499>0.482>0.456>0.442>0.433>0.416>0.393}。Among the 11 soil factors mentioned above, silt is the primary one affecting the growth of populus nigra var. thvestina bean, and soil available phosphorus is the secondary important factor.