林下植被剔除对杉木林土壤呼吸和微生物群落结构的影响

贺同鑫, 李艳鹏, 张方月, 王清奎

Effects of understory removal on soil respiration and microbial community composition structure in a Chinese fir plantation

HE Tong-Xin,LI Yan-Peng,ZHANG Fang-Yue,WANG Qing-Kui

表2 2013和2014年林下植被剔除对土壤理化性质和根系生物量的影响(平均值±标准误差, n = 3)

Table 2 Effects of understory removal on soil physicochemical properties and root biomass in 2013 and 2014 (mean ± SE, n = 3)

	2013		2014
	对照 Control	林下植被剔除 Understory removal	对照 Control	林下植被剔除 Understory removal
可溶性有机碳 Dissolved organic carbon (mg·kg^-1)	406.70 ± 7.70^a	373.20 ± 21.60^a	591.00 ± 26.50^a	510.90 ± 4.00^b
微生物生物量碳 Microbial biomass carbon (mg·kg^-1)	403.40 ± 12.30^a	274.60 ± 31.70^b	425.00 ± 5.60^a	377.90 ± 5.60^b
NH₄⁺-N (mg·kg^-1)	15.30 ± 0.50^b	19.50 ± 1.10^a	13.80 ± 0.50^a	13.70 ± 0.20^a
NO₃^–-N (mg·kg^-1)	7.70 ± 0.30^a	2.60 ± 0.50^b	2.80 ± 0.20^a	2.50 ± 0.30^a
有效磷 Available phosphorus (mg·kg^-1)	1.40 ± 0.10^a	0.80 ± 0.20^b	2.40 ± 0.10^a	1.80 ± 0.10^b
pH值 pH value	3.60 ± 0.02^a	3.60 ± 0.02^a	3.60 ± 0.02^a	3.60 ± 0.01^a
根系生物量 Root biomass (Mg·hm^-2)			0.40 ± 0.03^b	0.80 ± 0.01^a
根中碳含量 Root C content (%)			45.90 ± 0.40^a	46.70 ± 0.01^a
根中氮含量 Root N content (%)			0.60 ± 0.03^a	0.40 ± 0.02^b