人工草地土壤有机碳组分与微生物群落对施氮补水的响应

徐梦,徐丽君,程淑兰,方华军,卢明珠,于光夏,杨艳,耿静,曹子铖,李玉娜

Responses of Soil Organic Carbon Fractionation and Microbial Community to Nitrogen and Water Addition in Artificial Grassland

XU Meng,XU LiJun,CHENG ShuLan,FANG HuaJun,LU MingZhu,YU GuangXia,YANG Yan,GENG Jing,CAO ZiCheng,LI YuNa

表2 3种牧草种植模式下不同水氮处理的土壤理化特征

Table 2 Effect of N and water treatment on soil general properties under three forage cultivation types

处理 Treatment pH 有机碳 SOC (g·kg-1) 总氮 TN (g·kg-1) 硝态氮 NO3--N (mg·kg-1) 铵态氮 NH4+-N (mg·kg-1) 总可溶性氮 TDN (mg kg-1) 土壤水分 Soil moisture (%) 苜蓿单播 Alfalfa monoculture CK 7.0±0.4a 21.6±1.5a 2.1±0.1a 27.0±2.6c 4.6±0.4a 51.3±1.2c 12.4±0.3a N 7.1±0.4a 20.2±0.7a 2.0±0.1a 52.9±6.9b 6.1±0.8a 78.8±6.8b 12.8±0.4a W 6.6±0.5a 22.0±1.0a 2.1±0.1a 28.7±1.8c 5.4±0.8a 54.3±3.3c 13.6±0.6a N+W 6.4±0.5a 21.3±1.0a 2.2±0.1a 78.3±11.4a 6.6±1.4a 103.8±11.4a 12.7±0.8a 无芒雀麦单播 Smooth bromegrass monoculture CK 7.2±0.2a 20.6±0.1a 2.1±0.0a 28.6±2.2b 4.7±0.8a 54.7±2.9b 12.5±0.9a N 6.6±0.2a 21.4±0.5a 2.2±0.0a 81.3±19.4a 6.4±0.9a 121.2±26.1a 13.0±0.9a W 7.2±0.2a 19.6±1.3a 2.0±0.1a 40.4±9.0b 4.9±0.4a 67.1±10.0b 13.0±1.1a N+W 7.0±0.3a 20.4±0.8a 2.0±0.1a 55.4±7.6ab 4.8±0.9a 80.9±9.0ab 12.2±0.5a 苜蓿-无芒雀麦混播 Mixed cultivation CK 6.8±0.2a 21.6±1.2a 2.1±0.1a 29.9±3.0b 5.6±1.0a 55.7±4.7b 12.9±0.5a N 6.8±0.3a 21.8±1.4a 2.2±0.1a 72.3±7.8a 6.0±1.7a 104.6±6.8a 13.1±0.7a W 7.0±0.2a 22.5±0.8a 2.2±0.1a 25.8±3.8b 6.0±0.9a 54.4±4.3b 12.4±0.3a N+W 7.1±0.3a 21.8±2.3a 2.2±0.2a 78.1±10.3a 5.8±0.7a 109.1±11.6a 12.4±0.4a