焉耆盆地绿洲农田不同类型土壤有机碳空间分布特征及储量估算

doi:10.13866/j.azr.2021.03.09

Abstract

Abstract:

We investigated the density and spatial distribution of Yanqi basin oasis farmland soil organic carbon (SOC) among different soil types. Using long-term monitoring data from the Yanqi basin of the Xinjiang oasis area, we applied the DeNitrification-DeComposition (DNDC) model to conduct a simulated experiment. The results of the experiment showed that the DNDC model accurately simulated the SOC and its dynamic changes in this region, producing a correlation coefficient (r) higher than 92.75%. The relative error (E) was between 2.98% and 4.12%, indicating that the model has high reliability. In 2018, the SOC density in the 0-20 cm layer in the oasis area of Yanqi Basin was 12000-28000 kg·hm^-2, and the total soil organic carbon reserves were 2414 Mg, with obvious differences among regions. Additionally, significant differences in SOC density and reserves were detected among soil types. The SOC density was highest in marsh soil at 25136 kg·hm^-2 and lowest in stony soil at 13335 kg·hm^-2. The implementation of specific field management measures for different regions and soil types is essential to restore the SOC cycle balance and facilitate the sustainable development of farmland in China.

Key words: oil organic carbon, DeNitrification-DeComposition model, Yanqi Oasis Basin, different soil types, organic carbon reserves, farmland soil

SHI Changming,LIU Yang,ZHANG Furong,ZHAO Yunfei,XIAO Jinjin,WANG Xia. Soil organic carbon spatial distribution and reserve estimation of different soil types in Yanqi Basin oasis area[J].Arid Zone Research, 2021, 38(3): 672-681.

Figures/Tables 10

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References 31

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类别	处理
类别	YL	YF	BF	BY	JX	SX
种植作物	辣椒	番茄	番茄	玉米	春小麦	春小麦
土壤质地	粉砂质壤土	粉砂质壤土	粉砂质壤土	壤土	壤土	砂质壤土
土壤类型	棕漠土	沼泽土	潮土	潮土	棕漠土	棕漠土
种植日期	04-15	04-15	04-05	04-05	04-05	04-15
收获日期	09-25	09-15	09-15	10-05	10-05	07-20
N/（kg·hm^-2）	140.33	135.07	149.25	159.41	184.32	168.89
P₂O₅/（kg·hm^-2）	47.11	40.86	41.30	50.43	52.21	45.08
K₂O/（kg·hm^-2）	96.89	115.1	111.96	140.62	130.24	128.24
秸秆还田比例/%	50	50	50	50	50	50
初始有机碳含量/（g·kg^-1）	13.88	11.09	8.56	9.26	9.16	10.02
初始容重/（g·cm^-3）	1.31	1.28	1.27	1.36	1.42	1.34

参数	默认值			观测值
参数	粉砂质壤土	壤土	砂质壤土	粉砂质壤土	壤土	砂质壤土
黏土比例	0.140	0.190	0.090	0.120	0.078	0.083
孔隙度	0.485	0.451	0.435	0.479	0.459	0.421
萎焉点	0.20	0.22	0.15	0.25	0.28	0.19
田间持水量	0.40	0.49	0.32	0.43	0.50	0.36

类别	处理
类别	YL	YF	BF	BY	JX	SX
RMSE/%	1.2	2.5	2.1	2.3	1.2	1.7
MAE/%	1.30	2.10	1.67	1.63	1.20	1.50
E/%	3.56	4.12	3.12	3.45	3.33	2.98
r/%	96.14	92.75	99.45	97.49	99.24	98.55

土壤类型	面积/km²	百分比/%	SOCS/Gg	百分比/%	SOCD/(kg·hm^-2)
棕漠土	692	26.79	347.45	14.39	17200
风沙土	65	2.52	58.69	2.43	16303
石质土	12	0.46	4.71	0.20	13334
草甸土	290	11.23	364.73	15.11	20490
潮土	849	32.87	1017.85	42.16	24234
沼泽土	97	3.76	123.16	5.10	25135
盐土	461	17.85	380.95	15.78	23228
灌漠土	117	4.53	116.65	4.83	19770

土壤类型	焉耆县		博湖县		和硕县		和静县
土壤类型	面积/km²	百分比/%	面积/km²	百分比/%	面积/km²	百分比/%	面积/km²	百分比/%
棕漠土	154.16	23.91	58.24	14.00	376.83	49.97	102.77	14.76
风沙土	0	0	1.81	0.43	3.61	0.48	0	0
石质土	0	0	0	0	0	0	0	0
草甸土	22.81	3.54	104.27	25.06	16.29	2.16	146.63	21.05
潮土	327.47	50.79	135.44	32.55	141.50	18.76	244.59	35.12
沼泽土	15.84	2.46	37.61	9.04	0	0.00	43.55	6.25
盐土	92.76	14.39	78.71	18.92	174.28	23.11	115.25	16.55
灌漠土	31.73	4.92	0	0	41.64	5.52	43.63	6.26

Soil organic carbon spatial distribution and reserve estimation of different soil types in Yanqi Basin oasis area

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