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
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王开丽,杨合龙,肖红,孙伟,戎郁萍
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Effects of Nitrogen Application and Clipping Height on Vegetation Productivity and Plant Community Composition of Haying Meadow Steppe
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WANG KaiLi,YANG HeLong,XIAO Hong,SUN Wei,RONG YuPing
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表6 群落功能群丰富度、生物量和土壤因子的逐步多元回归分析
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Table 6 Stepwise multiple regression analysis of species richness and biomass of community and functional groups versus soil factors
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响应变量
Response variable | 群落组成
Community composition | 回归方程
Regression equations | 物种丰富度
Species richness | 群落Community | Y= 34.82 +0.43X1 -6.04X3+2.57X4 -0.24X5 +0.49X6 (R2=0.31, F=8.62, P<0.001) | | 禾草Grasses | Y= -9.00 +0.11X1 +1.97X2 -0.7X3+0.19X4 +0.07X6 (R2=0.36, F=10.43, P<0.001) | | 杂类草Nongraminous forbs | Y= 49.76 +0.54X1 -5.36X2 +2.06X4 -0.2X5 +0.25X6 (R2=0.31, F=8.47, P<0.001) | 生物量
Biomass | 群落Community | Y= 901.99 -15.53X1 +1.87X5 (R2=0.42, F=20.9, P<0.001) | | 禾草Grasses | Y= 548.51 -15.45 X1 -30.56X3 -19.05 X4+2.91X5 (R2=0.43, F=21.83, P<0.001) | | 杂类草Nongraminous forbs | Y= -54.01 +35.81X3 (R2=0.15, F=20.28, P<0.001) |
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