外来植物入侵对土壤氮有效性的影响
许浩,胡朝臣,许士麒,孙新超,刘学炎(
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Effects of exotic plant invasion on soil nitrogen availability
XU Hao,HU Chao-Chen,XU Shi-Qi,SUN Xin-Chao,LIU Xue-Yan()
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图4. 不同生活型植物入侵区域相对于无入侵区域土壤铵态氮含量的相对变化与固氮入侵植物占比之间的关系(A)和土壤硝态氮含量的相对变化分别与铵态氮含量(空心符号)的相对变化、固氮入侵植物占比(实心符号)之间的关系(B)。一年生草本、多年生草本、常绿灌木、落叶灌木、常绿乔木、落叶乔木分别缩写为AH、PH、ES、DS、ET、DT。
Fig. 4. Relationship between relative variation (RV) values of soil NH4+-N contents and percentage of N2-fixing invasive plants (A) and relationships between relative variation (RV) values of soil NO3--N contents and those of soil NH4+-N contents (hollow symbol), and percentage of N2-fixing invasive plants (solid symbol) (B) among different groups of invasive plants. AH, PH, ES, DS, ET, and DT represent annual herb, perennial herb, evergreen shrub, deciduous shrub, evergreen tree, and deciduous tree, respectively.
