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施氮与刈割留茬高度对草场生产力及植物群落组成的影响
王开丽,杨合龙,肖红,孙伟,戎郁萍()
Effects of Nitrogen Application and Clipping Height on Vegetation Productivity and Plant Community Composition of Haying Meadow Steppe
WANG KaiLi,YANG HeLong,XIAO Hong,SUN Wei,RONG YuPing()

图1. 施氮量和刈割留茬高度对群落及功能群物种丰富度（a）和地上生物量（b）的影响
M4和M8代表刈割留茬高度分别为4 cm和8 cm;N0、N1、N2、N3和N4代表施氮量分别为0、10、20、30和40 g·m-2·a-1,图2、3和表5同。数据为均值±标准误,不同的字母代表不同施氮量间差异显著（P<0.05）

Fig. 1. Effects of nitrogen addition rate and mowing height on species richness (a) and aboveground biomass (b) of community and functional group
M4 and M8 represent mowing height on 4 cm and 8 cm respectively. N0, N1, N2, N3 and N4 represent nitrogen addition rate about 0, 10, 20, 30 and 40 g·m-2a-1, respectively. The same as in Fig. 2, Fig. 3 and Table 5. Values (Mean ± SE) followed by different letters represent significantly different within each N gradient at P<0.05