Comparison of soil labile organic carbon in Chinese fir plantations and natural secondary forests in north subtropical areas of China

doi:10.3724/SP.J.1258.2012.00431

Abstract

Abstract:

Aims Our objective was to assess the effects of land use type conversion on the soil liable organic carbon pool in north subtropical areas of China.
Methods We used reference land unit to collect soil samples in natural secondary forests and Chinese fir (Cunninghamia lanceolata) plantations and analyzed liable organic carbon in the depth of 0-60 cm.
Important findings The contents of soil total organic carbon (TOC), easily-oxidized carbon (EOC), water-soluble organic carbon (WSOC) and light fraction organic matter (LFOM) in the soil of natural secondary forests were higher than those in Chinese fir plantations. The variations in amplitude for these four parameters were 19.0%-32.6%, 0.8%-30.3%, 3.8%-54.1% and 6.3%-38.6%, respectively. There were significant differences in the depth of 0-10 cm and 10-20 cm (p < 0.05) (WSOC was only significantly different in the depth of 0-10 cm). The ratios of WSOC and EOC to TOC content in Chinese fir plantations were higher than those in natural secondary forests. WSOC, EOC and LFOM were significantly related to TOC in the two forest stands, and the correlation coefficients of EOC and LFOM to TOC in natural secondary forests were higher than those in Chinese fir plantations. TOC, WSOC, EOC and LFOM were all significantly related to soil nutrients (total N, hydrolysis N and available K, Ca and Mg).

Key words: Cunninghamia lanceolata plantation, labile organic carbon, light fraction organic matter, natural secondary forest

LIU Rong-Jie, WU Ya-Cong, ZHANG Ying, LI Zheng-Cai, MA Shao-Jie, WANG Bin, GERI Le-Tu. Comparison of soil labile organic carbon in Chinese fir plantations and natural secondary forests in north subtropical areas of China[J]. Chin J Plant Ecol, 2012, 36(5): 431-437.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2012.00431

https://www.plant-ecology.com/EN/Y2012/V36/I5/431

Figures/Tables 5

References 30

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土地利用类型 Land use type	主要植物 Main plant	平均树高 Average tree height (m)	平均胸径 Average DBH (cm)	立木密度 Stem density (株·hm^-2)	郁闭度 Canopy density	管理方式 Management mode	林龄 Stand age (a)
杉木人工林 Cunninghamia lanceolata plantation	杉木 C. lanceolata	16.0	16.2	1 560	0.9	抚育采伐 Tending felling	32
天然次生林 Natural secondary forest	壳斗科、樟科为主 Fagaceae, Lauraceae-based	15.5	13.4	510	0.8	封山育林 Enclose the hills for natural afforestation	43

土地利用类型 Land use type	主要植物 Main plant	平均树高 Average tree height (m)	平均胸径 Average DBH (cm)	立木密度 Stem density (株·hm^-2)	郁闭度 Canopy density	管理方式 Management mode	林龄 Stand age (a)
杉木人工林 Cunninghamia lanceolata plantation	杉木 C. lanceolata	16.0	16.2	1 560	0.9	抚育采伐 Tending felling	32
天然次生林 Natural secondary forest	壳斗科、樟科为主 Fagaceae, Lauraceae-based	15.5	13.4	510	0.8	封山育林 Enclose the hills for natural afforestation	43

土层 Soil layer (cm)	土层总有机碳 TOC (g·kg^-1)		水溶性有机碳 WSOC (mg·kg^-1)		易氧化碳 EOC (g·kg^-1)		轻组有机质 LFOM (g·kg^-1)
土层 Soil layer (cm)	天然次生林 SF	杉木人工林 CF	天然次生林 SF	杉木人工林 CF	天然次生林 SF	杉木人工林 CF	天然次生林 SF	杉木人工林 CF
0-10	38.65 ± 5.32^A	31.32 ± 2.57^B	73.99 ± 12.98^A	56.77 ± 8.82^B	15.58 ± 3.15^A	13.30 ± 1.20^B	27.84 ± 6.71^A	24.13 ± 6.28^B
10-20	30.37 ± 4.49^A	22.92 ± 1.43^B	61.07 ± 12.21	53.25 ± 10.35	12.21 ± 2.84 ^A	7.92 ± 1.26 ^B	20.66 ± 6.68^A	14.91 ± 2.43^B
20-30	23.12 ± 3.58	18.74 ± 1.82	51.99 ± 10.07	51.59 ± 9.14	7.14 ± 0.49	6.88 ± 0.66	14.82 ± 5.02	11.54 ± 1.87
30-40	18.94 ± 2.51	15.92 ± 1.83	52.70 ± 10.75	51.06 ± 6.00	5.68 ± 0.74	5.06 ± 0.92	11.14 ± 4.06	8.33 ± 1.45
40-50	18.58 ± 1.80	14.58 ± 2.19	53.44 ± 15.41	49.95 ± 6.78	4.33 ± 0.68	4.19 ± 0.84	8.64 ± 1.98	7.94 ± 2.26
50-60	16.67 ± 1.34	12.60 ± 2.41	51.93 ± 8.19	48.57 ± 4.44	3.85 ± 0.76^A	3.46 ± 0.47^B	7.61 ± 2.15	7.16 ± 2.65

土层 Soil layer (cm)	土层总有机碳 TOC (g·kg^-1)		水溶性有机碳 WSOC (mg·kg^-1)		易氧化碳 EOC (g·kg^-1)		轻组有机质 LFOM (g·kg^-1)
土层 Soil layer (cm)	天然次生林 SF	杉木人工林 CF	天然次生林 SF	杉木人工林 CF	天然次生林 SF	杉木人工林 CF	天然次生林 SF	杉木人工林 CF
0-10	38.65 ± 5.32^A	31.32 ± 2.57^B	73.99 ± 12.98^A	56.77 ± 8.82^B	15.58 ± 3.15^A	13.30 ± 1.20^B	27.84 ± 6.71^A	24.13 ± 6.28^B
10-20	30.37 ± 4.49^A	22.92 ± 1.43^B	61.07 ± 12.21	53.25 ± 10.35	12.21 ± 2.84 ^A	7.92 ± 1.26 ^B	20.66 ± 6.68^A	14.91 ± 2.43^B
20-30	23.12 ± 3.58	18.74 ± 1.82	51.99 ± 10.07	51.59 ± 9.14	7.14 ± 0.49	6.88 ± 0.66	14.82 ± 5.02	11.54 ± 1.87
30-40	18.94 ± 2.51	15.92 ± 1.83	52.70 ± 10.75	51.06 ± 6.00	5.68 ± 0.74	5.06 ± 0.92	11.14 ± 4.06	8.33 ± 1.45
40-50	18.58 ± 1.80	14.58 ± 2.19	53.44 ± 15.41	49.95 ± 6.78	4.33 ± 0.68	4.19 ± 0.84	8.64 ± 1.98	7.94 ± 2.26
50-60	16.67 ± 1.34	12.60 ± 2.41	51.93 ± 8.19	48.57 ± 4.44	3.85 ± 0.76^A	3.46 ± 0.47^B	7.61 ± 2.15	7.16 ± 2.65

土层 Soil layer (cm)	水溶性有机碳占总有机碳的比率 WSOC/TOC (%)		易氧化碳占总有机碳的比率 EOC/TOC (%)
土层 Soil layer (cm)	天然次生林 SF	杉木人工林 CF	天然次生林 SF	杉木人工林 CF
0-10	0.19	0.18	40.31	42.48
10-20	0.20	0.23	40.19	34.56
20-30	0.23	0.28	30.90	36.72
30-40	0.28	0.32	30.00	31.81
40-50	0.29	0.34	23.32	28.74
50-60	0.31	0.39	23.09	27.45