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5 施氮对各处理土壤理化性状的影响
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Table 5 Effects of N application on soil properties (Mean±SE)
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年份
Year | 施氮梯度
N gradient | pH值
pH value | 含水量
Water content (%) | 全氮
TN
(g·kg-1) | 铵态氮
NH4+-N (mg·kg-1) | 硝态氮
NO3--N (mg·kg-1) | 总无机氮
ION
(mg·kg-1) | 有机碳
SOC
(g·kg-1) | 碳氮比
C/N | | 2017 | N0 | 6.89±0.06a | 20.31±1.26a | 3.18±0.11a | 1.01±0.18c | 8.29±1.83c | 9.30±1.99c | 34.82±1.16a | 11.02±0.39a | | N1 | 6.76±0.05ab | 18.80±0.81a | 3.18±0.13a | 0.82±0.08c | 12.58±1.31b | 13.41±1.32b | 33.65±1.65a | 10.61±0.36ab | | N2 | 6.56±0.07b | 19.13±0.63a | 3.31±0.11a | 1.24±0.12c | 21.43±2.22b | 22.68±2.21b | 33.94±2.24a | 10.23±0.56ab | | N3 | 6.48±0.06c | 19.17±0.45a | 3.2±0.14a | 2.42±0.36b | 33.82±3.36a | 36.25±3.50a | 31.02±1.28a | 9.82±0.45ab | | N4 | 6.42±0.06c | 19.11±0.68a | 3.42±0.14a | 3.74±0.45a | 44.22±4.97a | 47.95±5.36a | 31.02±2.57a | 9.06±0.64b | | 2018 | N0 | 6.67±0.07a | 18.26±0.66a | 3.05±0.12a | — | — | — | 25.34±2.09a | 7.71±0.98a | | N1 | 6.61±0.02a | 16.29±0.75ab | 2.99±0.09a | — | — | — | 26.45±1.39a | 8.84±0.72a | | N2 | 6.67±0.07a | 15.07±0.33b | 3.24±0.16a | — | — | — | 30.46±1.76a | 9.38±0.53a | | N3 | 6.58±0.03a | 14.49±0.22b | 3.14±0.17a | — | — | — | 28.68±1.49a | 8.96±0.56a | | N4 | 6.5±0.07a | 13.67±0.41c | 3.16±0.14a | — | — | — | 25.91±0.99a | 6.86±1.42a |
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