内蒙古和青藏高原草原植物叶片与根系氮利用效率空间格局及影响因素
符义稳1,2,田大栓2,汪金松2,牛书丽2,3,赵垦田1,*(
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Patterns and affecting factors of nitrogen use efficiency of plant leaves and roots in Nei Mongol and Qinghai-Xizang Plateau grasslands
FU Yi-Wen1,2,TIAN Da-Shuan2,WANG Jin-Song2,NIU Shu-Li2,3,ZHAO Ken-Tian1,*()
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图6. 生物(植物功能群)和非生物因素(年平均气温、年降水量和干旱指数)对植物叶片或根系氮利用效率(NUE)影响的直接和间接效应。图中线条粗细表示影响效应大小, 实线表示作用路径显著(p < 0.05), 虚线表示作用路径不显著(p > 0.05)。绿色表示负效应, 红色表示正效应。R2表示解释率。
Fig. 6. Direct and indirect impacts of biotic (plant functional group (PFG)) and abiotic (mean annual air temperature (MAT), mean annual precipition (MAP) and drought index (r)) factors on leaf or root nitrogen use efficiency (NUE) in grassland plants. Line thickness indicates relative effect size. Solid lines denote a significant influence (p < 0.05), whereas dashed lines indicate no significant impact (p > 0.05). Green color represents a negative effect, while red color denotes a positive impact. R2 indicates how much variation can be explained.
