Effects of intensive and extensive management on soil active organic carbon in bamboo forests of China

doi:10.3724/SP.J.1258.2011.00551

Abstract

Abstract:

Aims Our objective was to determine the effects of intensive cultivation on soil organic carbon (SOC) in bamboo (Phyllostachys heterocycla ‘Pubescens’) forests.

Methods We used the reference land unit method and collected soil samples in intensively and extensively managed bamboo forests in the spring.

Important findings Under intensive management, total organic carbon (TOC) decreased by 7.01% and 18.90% and readily oxidized carbon (ROC) decreased by 31.22% and 46.03% in 0-10 and 10-20 cm soil layers, respectively. Also, light fraction organic matter (LFOM) decreased 19.87% in the 0-20 cm soil layer. Soil organic carbon under the two types of management decreased with increasing soil depth, but the ranges of decrease were different. The vertical distribution of ROC under extensive management paralleled that of TOC, while both were different under intensive management. LFOM tended to accumulate in surface layers (0-20 cm). TOC, ROC and LFOM were strongly correlated with soil nutrients (p < 0.01), and TOC was significantly related to available P (p < 0.05). After intensive management, the percentage of ROC to TOC and activity of carbon pool significantly dropped by 26.01% and 50.52% (p < 0.05), respectively, in the 0-10 cm soil layer and dropped by 35.51% and 54.41% respectively in the 10-20 cm soil layer. Therefore, a mixture of organic and inorganic manures with the proper ratio should be applied to promote SOC and improve biological and chemical soil activity.

Key words: bamboo forest, intensive management, light fraction organic matter, soil active organic carbon

MA Shao-Jie, LI Zheng-Cai, WANG Gang, LIU Rong-Jie, FU Mao-Yi, ZHOU Ben-Zhi. Effects of intensive and extensive management on soil active organic carbon in bamboo forests of China[J]. Chin J Plant Ecol, 2011, 35(5): 551-557.

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URL: https://www.plant-ecology.com/EN/10.3724/SP.J.1258.2011.00551

https://www.plant-ecology.com/EN/Y2011/V35/I5/551

Figures/Tables 3

References 24

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土层 Soil layer (cm)	总有机碳 Total organic carbon (g·kg^-1)		易氧化碳 Readily oxidized carbon (g·kg^-1)		轻组有机质 Light fraction organic matter (g·kg^-1)
土层 Soil layer (cm)	集约经营 Intensive management	粗放经营 Extensive management	集约经营 Intensive management	粗放经营 Extensive management	集约经营 Intensive management	粗放经营 Extensive management
0-10	29.83 (0.46)	32.08 (1.45)	14.52 (0.91)^a	21.11 (1.50)^b	8.59 (1.34)^a	10.72 (2.50)^b
10-20	18.86 (1.36)^a	23.18 (1.29)^b	7.20 (0.35)^a	13.34 (0.74)^b	8.59 (1.34)^a	10.72 (2.50)^b
20-30	12.71 (0.26)^a	16.39 (1.16)^b	5.50 (0.20)^a	7.35 (0.43)^b	0.45 (0.05)	0.53 (0.10)
30-40	9.97 (0.94)	10.69 (0.61)	3.70 (0.20)	3.99 (0.18)	0.45 (0.05)	0.53 (0.10)
40-50	8.05 (0.58)	9.89 (1.16)	2.34 (0.29)^a	3.73 (0.19)^b	0.18 (0.03)	0.23 (0.02)
50-60	7.24 (0.19)	7.74 (0.50)	1.91 (0.10)	2.29 (0.26)	0.18 (0.03)	0.23 (0.02)
60-70	6.38 (0.09)	7.18 (0.65)	1.68 (0.15)	1.98 (0.01)	0.04 (0.008)	0.05 (0.005)
70-80	6.33 (0.09)	6.23 (0.25)	1.44 (0.04)	1.36 (0.04)	0.04 (0.008)	0.05 (0.005)

土层 Soil layer (cm)	总有机碳 Total organic carbon (g·kg^-1)		易氧化碳 Readily oxidized carbon (g·kg^-1)		轻组有机质 Light fraction organic matter (g·kg^-1)
土层 Soil layer (cm)	集约经营 Intensive management	粗放经营 Extensive management	集约经营 Intensive management	粗放经营 Extensive management	集约经营 Intensive management	粗放经营 Extensive management
0-10	29.83 (0.46)	32.08 (1.45)	14.52 (0.91)^a	21.11 (1.50)^b	8.59 (1.34)^a	10.72 (2.50)^b
10-20	18.86 (1.36)^a	23.18 (1.29)^b	7.20 (0.35)^a	13.34 (0.74)^b	8.59 (1.34)^a	10.72 (2.50)^b
20-30	12.71 (0.26)^a	16.39 (1.16)^b	5.50 (0.20)^a	7.35 (0.43)^b	0.45 (0.05)	0.53 (0.10)
30-40	9.97 (0.94)	10.69 (0.61)	3.70 (0.20)	3.99 (0.18)	0.45 (0.05)	0.53 (0.10)
40-50	8.05 (0.58)	9.89 (1.16)	2.34 (0.29)^a	3.73 (0.19)^b	0.18 (0.03)	0.23 (0.02)
50-60	7.24 (0.19)	7.74 (0.50)	1.91 (0.10)	2.29 (0.26)	0.18 (0.03)	0.23 (0.02)
60-70	6.38 (0.09)	7.18 (0.65)	1.68 (0.15)	1.98 (0.01)	0.04 (0.008)	0.05 (0.005)
70-80	6.33 (0.09)	6.23 (0.25)	1.44 (0.04)	1.36 (0.04)	0.04 (0.008)	0.05 (0.005)

土壤养分 Soil nutrient	总有机碳 TOC	易氧化碳 ROC	轻组有机质 LFOM	全氮 Total N	水解氮 Hydrolysis N	速效磷 Available P	速效钾 Available K	速效钙 Available Ca	速效镁 Available Mg
总有机碳 Total organic carbon (TOC)	1.000
易氧化碳 Readily oxidized carbon (ROC)	0.960^**	1.000
轻组有机质 Light fraction organic matter (LFOM)	0.836^**	0.747^**	1.000
全氮 Total N	0.948^**	0.917^**	0.917^**	1.000
水解氮 Hydrolysis N	0.949^**	0.897^**	0.909^**	0.982^**	1.000
速效磷 Available P	0.485^*	0.581^**	0.561^**	0.634^**	0.522^**	1.000
速效钾 Available P	0.735^**	0.725^**	0.736^**	0.808^**	0.736^**	0.647^**	1.000
速效钙 Available Ca	0.823^**	0.877^**	0.700^**	0.837^**	0.783^**	0.593^**	0.857^**	1.000
速效镁 Available Mg	0.782^**	0.820^**	0.703^**	0.817^**	0.759^**	0.684^**	0.876^**	0.923^**	1.000

土壤养分 Soil nutrient	总有机碳 TOC	易氧化碳 ROC	轻组有机质 LFOM	全氮 Total N	水解氮 Hydrolysis N	速效磷 Available P	速效钾 Available K	速效钙 Available Ca	速效镁 Available Mg
总有机碳 Total organic carbon (TOC)	1.000
易氧化碳 Readily oxidized carbon (ROC)	0.960^**	1.000
轻组有机质 Light fraction organic matter (LFOM)	0.836^**	0.747^**	1.000
全氮 Total N	0.948^**	0.917^**	0.917^**	1.000
水解氮 Hydrolysis N	0.949^**	0.897^**	0.909^**	0.982^**	1.000
速效磷 Available P	0.485^*	0.581^**	0.561^**	0.634^**	0.522^**	1.000
速效钾 Available P	0.735^**	0.725^**	0.736^**	0.808^**	0.736^**	0.647^**	1.000
速效钙 Available Ca	0.823^**	0.877^**	0.700^**	0.837^**	0.783^**	0.593^**	0.857^**	1.000
速效镁 Available Mg	0.782^**	0.820^**	0.703^**	0.817^**	0.759^**	0.684^**	0.876^**	0.923^**	1.000

土层 Soil layer (cm)			碳库活度 Activity of C pool
	集约经营 Intensive management	粗放经营 Extensive management	集约经营 Intensive management	粗放经营 Extensive management
0-10	48.56^a	65.63^b	0.95^a	1.92^b
10-20	36.89	57.20	0.62	1.36
20-30	43.26	45.11	0.76	0.81
30-40	36.88	37.16	0.59	0.59
40-50	28.81^a	37.55^b	0.41^a	0.60^b
50-60	26.42^a	29.37^b	0.36	0.42
60-70	26.29	27.39	0.36	0.38
70-80	22.58	21.61	0.29	0.28