Characteristics of Soil Organic Carbon Fractions of Main Agricultural Soils in Mid-subtropical Areas

doi:10.11923/j.issn.2095-4050.cjas20190800173

Abstract

Abstract:

In main agricultural regions of mid-subtropical zone, to understand soil fertility status, the authors studied the content and accumulation characteristics of soil organic carbon components by field sampling and indoor analysis. The results showed that: the content of organic carbon (SOC) in purple soil was the highest, while the red soil had low organic matter content and the fertility level was not high. The variation tendency of soil easily oxidized organic carbon (EOC) was consistent with SOC. Light fraction organic carbon (LFOC), coarse particulate organic carbon(CPOC), fine particulate organic carbon(FPOC) had the largest proportion in red soil, river tidal soil and rice soil, respectively, which were related to soil parent material and development age. Under different utilizing ways, the content of SOC in tea garden was the highest. The sequence of SOC was tea garden > corn field > rice-rape field > cotton field > vegetable garden. The value of EOC/SOC in tea garden was 36.85%, which indicated that the soil organic carbon was stable. The value of EOC/SOC of other agricultural soils changed a little, ranging from 22.48% to 25.52%, with an average value of 23.44%. LFOC and CPOC were more sensitive to land use change than SOC, and were significantly affected by SOC, CEC, NO₃^--N and NH₄⁺-N (P<0.01).

Key words: Mid-subtropical Areas, Agricultural Soil, Soil Organic Carbon and Its Fractions, Stability

CLC Number:

S153.3

Yuan Hong, Li Han, Zhang Liang, Duan Liangxia, Huang Yunxiang, Wang Hui. Characteristics of Soil Organic Carbon Fractions of Main Agricultural Soils in Mid-subtropical Areas[J]. Journal of Agriculture, 2021, 11(1): 17-21.

Figures/Tables 4

References 28

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土样编号	土壤类型	母质类型	采样地点	pH(H₂O)	pH值(KCl)	种植方式	质地
1	红壤	第四纪红土	湖南长沙	4.79±0.02	4.83±0.02	蔬菜	中黏土
2	河潮土	河流冲积物	湖南华容	7.62±0.02	7.66±0.01	棉花	中壤土
3	河潮土	河流冲积物	湖南华容	7.86±0.02	7.89±0.012	棉花	重壤土
4	红壤	第四纪红土	江西南昌	4.74±0.01	4.77±0.01	玉米	中黏土
5	紫色土	紫色页岩	重庆永川	3.86±0.02	3.88±0.01	茶园	轻黏土
6	水稻土	坡（冲）积物	重庆巴南	4.94±0.01	4.97±0.01	水稻—油菜轮作	轻黏土

土样编号	土壤类型	母质类型	采样地点	pH(H₂O)	pH值(KCl)	种植方式	质地
1	红壤	第四纪红土	湖南长沙	4.79±0.02	4.83±0.02	蔬菜	中黏土
2	河潮土	河流冲积物	湖南华容	7.62±0.02	7.66±0.01	棉花	中壤土
3	河潮土	河流冲积物	湖南华容	7.86±0.02	7.89±0.012	棉花	重壤土
4	红壤	第四纪红土	江西南昌	4.74±0.01	4.77±0.01	玉米	中黏土
5	紫色土	紫色页岩	重庆永川	3.86±0.02	3.88±0.01	茶园	轻黏土
6	水稻土	坡（冲）积物	重庆巴南	4.94±0.01	4.97±0.01	水稻—油菜轮作	轻黏土

项目	有机质OM	阳离子交换量CEC	硝态氮NO₃^--N	铵态氮NH₄⁺-N	有效磷AP	速效钾AK	碱解氮AN	易氧化有机碳EOC	轻组有机碳LFOC	粗颗粒有机碳CPOC	细颗粒有机碳FPOC
pH值	-0.175	-0.269	0.610	-0.475	0.968^**	-0.897^**	0.085	-0.305	-0.651	-0.532	0.486
OM		0.995^**	-0.887^**	0.949^**	0.039	-0.230	0.964^**	0.996^**	-0.564	0.947^**	0.712
CEC			-0.926^**	0.975^**	-0.054	-0.142	0.935^**	0.999^**	-0.494	0.972^**	0.647
NO₃^--N				-0.987^**	0.426	-0.240	-0.734^*	-0.918^**	0.132	-0.987^**	-0.328
NH₄⁺-N					-0.274	0.081	0.834^**	0.970^**	-0.291	0.999^**	0.471
AP						-0.975^**	0.300	-0.041	-0.828^*	-0.288	0.674
AK							-0.476	-0.170	0.920^**	0.079	-0.803
AN								0.941^**	-0.766	0.828^*	0.856^*
EOC									-0.508	0.967^**	0.652
LFOC										-0.287	-0.933^**
CPOC											0.459

项目	有机质OM	阳离子交换量CEC	硝态氮NO₃^--N	铵态氮NH₄⁺-N	有效磷AP	速效钾AK	碱解氮AN	易氧化有机碳EOC	轻组有机碳LFOC	粗颗粒有机碳CPOC	细颗粒有机碳FPOC
pH值	-0.175	-0.269	0.610	-0.475	0.968^**	-0.897^**	0.085	-0.305	-0.651	-0.532	0.486
OM		0.995^**	-0.887^**	0.949^**	0.039	-0.230	0.964^**	0.996^**	-0.564	0.947^**	0.712
CEC			-0.926^**	0.975^**	-0.054	-0.142	0.935^**	0.999^**	-0.494	0.972^**	0.647
NO₃^--N				-0.987^**	0.426	-0.240	-0.734^*	-0.918^**	0.132	-0.987^**	-0.328
NH₄⁺-N					-0.274	0.081	0.834^**	0.970^**	-0.291	0.999^**	0.471
AP						-0.975^**	0.300	-0.041	-0.828^*	-0.288	0.674
AK							-0.476	-0.170	0.920^**	0.079	-0.803
AN								0.941^**	-0.766	0.828^*	0.856^*
EOC									-0.508	0.967^**	0.652
LFOC										-0.287	-0.933^**
CPOC											0.459