冬季增温和减雪对黄土高原典型草原土壤养分和细菌群落组成的影响

毛瑾, 朵莹, 邓军, 程杰, 程积民, 彭长辉, 郭梁

Influences of warming and snow reduction in winter on soil nutrients and bacterial communities composition in a typical grassland of the Loess Plateau

MAO Jin, DUO Ying, DENG Jun, CHENG Jie, CHENG Ji-Min, PENG Chang-Hui, GUO Liang

表2 土壤理化性质和酶活性在不同处理下的比较(平均值±标准差, n = 4)

Table 2 Comparison of soil physical and chemical properties and enzyme activities under different treatments (means ± SD, n = 4)

土壤指标 Soil indicator	对照 CK	增温 W	减雪 S	互作 WS	F	p
土壤有机碳含量 SOC content (g·kg^-1)	23.66 ± 1.87^b	30.92 ± 0.28^a	25.00 ± 0.94^b	25.15 ± 1.09^b	7.39	*
全氮含量 TN content (g·kg^-1)	2.47 ± 0.06^c	3.03 ± 0.03^a	2.97 ± 0.03^a	2.71 ± 0.02^b	47.28	***
速效磷含量 AP content (mg·kg^-1)	3.30 ± 0.15^c	3.97 ± 0.15^ab	4.17 ± 0.03^a	3.53 ± 0.2^bc	7.23	*
硝态氮含量 NO- 3-N content (mg·kg^-1)	6.33 ± 0.41^a	4.37 ± 0.12^b	6.40 ± 0.55^a	4.83 ± 0.24^b	7.93	**
铵态氮含量 NH+ 4-N content (mg·kg^-1)	3.90 ± 0.41^b	4.03 ± 0.12^b	3.33 ± 0.55^b	5.83 ± 0.24^a	4.73	*
pH	7.51 ± 0.02^a	7.51 ± 0.01^a	7.48 ± 0^a	7.52 ± 0.02^a	1.54	NS
微生物生物量碳含量 MBC content (mg·kg^-1)	820.08 ± 23.97^b	951.73 ± 6.91^a	807.58 ± 48.58^b	696.02 ± 17.49^c	13.33	**
微生物生物量氮含量 MBN content (mg·kg^-1)	63.48 ± 1.51^a	67.57 ± 2.57^a	61.39 ± 9.10^a	54.60 ± 1.26^a	1.26	NS
β-1,4-葡萄糖苷酶活性 BG activity (nmol·g^-1·h^-1)	203.37 ± 16.45^a	211.55 ± 13.82^a	197.87 ± 16.04^ab	157.08 ± 4.32^b	3.19	NS
β-1,4-N-乙酰基氨基葡萄糖苷酶活性 NAG activity (nmol·g^-1·h^-1)	76.85 ± 1.67^a	70.94 ± 2.33^a	74.33 ± 5.31^a	56.33 ± 1.63^b	8.64	**
碱性磷酸酶活性 AKP activity (nmol·g^-1·h^-1)	656.61 ± 14.04^a	642.68 ± 46.49^a	586.07 ± 30.72^ab	539.64 ± 4.12^b	3.60	NS