太白山不同林分土壤肥力状况比较研究

Soil Fertility of Different Stands in the Taibai Mountains

通过对秦岭太白山地区以槲栎、橿子栎、榆树、臭椿、辽东栎和栾树等为优势树种的6种林分林下土壤的有机质、碱解氮、速效磷及阳离子交换量等肥力因子的比较研究,反映了不同林分土壤的基本肥力状况。结果表明：不同林分对土壤肥力状况影响不同。槲栎林和臭椿林土壤碱解氮含量较高。榆树林土壤的速效磷含量远远高于其他树种,0~20 cm土层速效磷含量为12.69 mg.kg-1。臭椿林土壤表层的有机质含量（159.42 g.kg-1）和阳离子交换量（51.54 cmol.kg-1）最高。

The forest soil fertility in six different stands,Quercus aliena,Quercus baronii,Ulmus pumila,Ailanthus altissima,Quercus liaotungensis,and Koelreuteria paniculata in the Taibai Mountains were studied.The results showed that,different tree species had different effects on soil fertility.Contents of alkali-hydrolyzable N in the Q.aliena forest and the A.altissima forest were higher than other stands.The content of available P in U.pumila forest was far higher than others,which was 12.69 mg·kg-1（0~20 cm soil layes）.The organic matter（159.42 g·kg-1）and the cation exchange capacity（51.54 cmol·kg-1） of the A.altissima forest were the highest.