长期人为干扰对桂西北喀斯特草地土壤微生物多样性及群落结构的影响

裴广廷, 孙建飞, 贺同鑫, 胡宝清

Effects of long-term human disturbances on soil microbial diversity and community structure in a karst grassland ecosystem of northwestern Guangxi, China

PEI Guang-Ting, SUN Jian-Fei, HE Tong-Xin, HU Bao-Qing

表2 不同干扰方式对桂西北喀斯特草地生态系统土壤理化性质的影响(平均值±标准误)

Table 2 Effects of different disturbances on soil properties in a karst grassland ecosystem of northwestern Guangxi, China (mean ± SE)

土壤性质 Soil property	中坡位 Middle slope position				下坡位 Lower slope position
土壤性质 Soil property	封育 Enclosure	火烧 Burning	刈割 Mowing	刈割除根 Mowing plus root removal	封育 Enclosure	火烧 Burning	刈割 Mowing	刈割除根 Mowing plus root removal
含水量 Moisture (%)	40.49 ± 1.71 ^a	42.32 ± 0.44 ^a	42.99 ± 2.12 ^a	38.08 ± 1.28 ^a	48.41 ± 1.78 ^a	46.10 ± 2.84 ^a	44.22 ± 4.98 ^a	46.57 ± 2.54 ^a
pH	7.81 ± 0.04 ^a	7.88 ± 0.07 ^a	7.93 ± 0.05 ^a	7.98 ± 0.05 ^a	7.69 ± 0.10 ^a	7.73 ± 0.04 ^a	7.90 ± 0.08 ^a	7.82 ± 0.03 ^a
有机碳含量 Soil organic carbon content (g·kg^-1)	53.89 ± 3.26 ^ab	62.31 ± 3.02 ^a	62.67 ± 4.06 ^a	50.61 ± 1.34 ^b	65.24 ± 4.84 ^a	47.11 ± 5.83 ^a	61.69 ± 8.92 ^a	58.70 ± 4.31 ^a
总氮含量 Total nitrogen content (g·kg^-1)	3.78 ± 0.19 ^b	4.44 ± 0.31 ^ab	4.61 ± 0.17 ^a	4.00 ± 0.13 ^ab	5.88 ± 0.59 ^a	4.80 ± 0.49 ^a	4.89 ± 0.89 ^a	5.09 ± 0.35 ^a
碳氮比 Carbon-nitrogen ratio	14.29 ± 0.86 ^a	14.07 ± 0.35 ^a	13.56 ± 0.48 ^a	12.68 ± 0.59 ^a	11.14 ± 0.34 ^b	9.77 ± 0.34 ^c	12.78 ± 0.46 ^a	11.54 ± 0.34 ^b
微生物生物量碳含量 Microbial biomass carbon content (g·kg^-1)	0.87 ± 0.08 ^a	0.23 ± 0.02 ^b	0.24 ± 0.03 ^b	0.44 ± 0.11 ^b	1.00 ± 0.04 ^a	0.27 ± 0.04 ^b	0.48 ± 0.09 ^b	0.42 ± 0.14 ^b
微生物生物量氮含量 Microbial biomass nitrogen content (g·kg^-1)	0.25 ± 0.02 ^a	0.19 ± 0.02 ^a	0.18 ± 0.04 ^a	0.22 ± 0.03 ^a	0.25 ± 0.04 ^ab	0.20 ± 0.03 ^b	0.34 ± 0.02 ^a	0.20 ± 0.07 ^ab
细根生物量 Fine root biomass (g·m^-2)	127.82 ± 16.23 ^a	102.61 ± 5.59 ^a	85.37 ± 22.03 ^a	68.14 ± 25.27 ^a	132.79 ± 39.01 ^a	49.38 ± 12.04 ^b	126.51 ± 11.93 ^a	77.42 ± 3.75 ^ab