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1��(Introduction)
��I�B(y��ng)��Ǯ�(d��ng)ǰ�҇�ˮ�h(hu��n)��I(l��ng)��ش��(zh��n)֮һ,��Ⱦ��Ҏ(gu��)��Ԟ��ṩ��(d��o)�Ժ�ǰհ�ԵĿ��w˼·�c��,��“Ҏ(gu��)��”�ѳɞ��҇��ˮ�h(hu��n)��Ļ��(zh��n)�t֮һ(��˴��,2009;��ѳɵ�,2010;�·��,2010),��

��,��“��”�ԁ�,��ᘌ��c(di��n)��(��)�ƶ��һϵ�е��ˮ��Ⱦ��Ҏ(gu��)��(��c,2008). �Ե�؞��,��Ⱥ��(zh��n)��(sh��)ʩ�˵��ˮ��Ⱦ��“��”Ӌ(j��)��2010 ��h(yu��n)��Ҏ(gu��)��,��“ʮ��”Ӌ(j��)��“ʮһ��”Ҏ(gu��)��a(b��)��(b��o)��(��N,2008;��t÷��,2009). ��Ҏ(gu��)��ָ��(d��o)��,“ʮһ��”��g,��Һ͵ط��(sh��)ʩ�˵��“��󹤳�”,��Ͷ�Y�s170 �|Ԫ��ˮ�|(zh��)��,��ȡ��һ��Ч��(��x��,2011). ��(j��)�O(ji��n)�y��(sh��)��(j��)��,2010 ��زݺ��⺣�ľC�ϠI�B(y��ng)��B(t��i)ָ��(sh��)��2009 ��քe�½�7�� 95%��0. 55%,�⺣2008—2010 ��ƽ��TN ��ȱ�2007 ��½�19. 7%. �M�ܵ��ˮ�|(zh��)��څ�ݵõ��һ��Ķ��,��ĕr(sh��)�g��е�څ�ݷ��Y(ji��)��,ˮ�|(zh��)��δ�ڸ��ϵõ��,��һ��(n��i)��(d��ng),ˮ�|(zh��)��ⲿ��Ȼ�l��׃��Ĳ��_��Ȼ�ܴ�(��t÷��,2009;Yang et al. , 2010;�K��,2011). һ��,��~��Ͷ�Y��δ��Ե�ˮ�|(zh��)��,��һ��Ĺ��Ҏ(gu��)ģ�Ԍ��,��ؽ��ƌW(xu��)�ĵ��Ҏ(gu��)��ָ��(d��o)�M(j��n)һ��Ⱦ��c��I�B(y��ng)��,��

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