Characteristics of soil respiration in farmland of Hexi oasis and its response to long-term fertilization

doi:10.7522/j.issn.1000-694X.2021.00147

Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (3): 178-186.DOI: 10.7522/j.issn.1000-694X.2021.00147

Characteristics of soil respiration in farmland of Hexi oasis and its response to long-term fertilization

Shiyang Chen¹^,²(), Rong Yang¹(), Yongzhong Su¹, Zeyu Du¹^,²

^1.Linze Inland River Basin Research Station，Northwest Institute of Eco-Environmental and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2021-08-03 Revised:2021-12-13 Online:2022-05-20 Published:2022-06-01
Contact: Rong Yang

Abstract

Abstract:

The soil respiration rate was measured by LI-COR 8100 in the newly reclaimed farmlands in Hexi desert oasis in July and August from 2019 to 2020. We analyzed the changes of soil respiration rate and diurnal dynamic variation under 9 different fertilization treatments to determine the key factors. The results showed that：（1） The soil respiration rate was influenced by M3， NP3， NPK1M3， NPK3M1， NPK2M2， NP1M3， NPK2， NPK3， NPK1 in turn from high level to low level. This indicates that the treatment of organic fertilizers application alone significantly increased soil respiration rate by 22.1%-41.4% in comparison with combined manure with chemical fertilizers and the treatment of chemical fertilizers alone. （2） The diurnal dynamic variation of soil respiration in different fertilization presented unimodal curve， and the peak value was found in the periods of 13：00-16：00. The diurnal dynamic variation of soil respiration had a significant correlation with soil temperature （5 cm）. （3） Soil temperature （5 cm） and soil moisture （5 cm） could explain 24.2%-44.8% and 7.7%-36.4% of soil respiration， respectively. A remarkable correlation was found between soil respiration rate and soil temperature， but soil respiration rate had no significant correlation with soil moisture. The temperature sensitivity coefficient of soil respiration Q₁₀ was in the range of 1.419 to 1.600， which was lower than the world average value of 2.4， because high temperature led to decreased sensitivity of soil respiration to temperature changes. （4） Soil respiration was significantly negatively correlated with organic matter， total nitrogen， total carbon and available nitrogen. After applying organic fertilizers， soil organic matter， total nitrogen， total carbon and available nitrogen increased by 188.9%， 80.5%， 79.3% and 147.0% respectively. Thus soil respiration was promoted. There is no significant relationship between soil respiration and maize yield. In conclusion， fertilization measures have an effect on soil quality and soil respiration rate. The balanced application of organic and inorganic fertilizers can improve soil quality while reducing CO₂ emissions， which can be adopted in production practice.

Key words: long-term fertilization, soil respiration, diurnal dynamic variation, soil temperature, soil moisture

CLC Number:

S154

Shiyang Chen, Rong Yang, Yongzhong Su, Zeyu Du. Characteristics of soil respiration in farmland of Hexi oasis and its response to long-term fertilization[J]. Journal of Desert Research, 2022, 42(3): 178-186.

Figures/Tables 8

References 32

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处理	M3	NP3	NP1M3	NPK1	NPK2	NPK3	NPK1M3	NPK2M2	NPK3M1
相关系数	0.601	0.383	0.425	0.498	0.624	0.638	0.466	0.517	0.551
显著性	0.000	0.003	0.001	0.000	0.000	0.000	0.000	0.000	0.000

处理	M3	NP3	NP1M3	NPK1	NPK2	NPK3	NPK1M3	NPK2M2	NPK3M1
相关系数	0.601	0.383	0.425	0.498	0.624	0.638	0.466	0.517	0.551
显著性	0.000	0.003	0.001	0.000	0.000	0.000	0.000	0.000	0.000

处理	拟合方程	R2	样本数	P	土壤呼吸温度敏感性系数Q₁₀
M3	R_s=3.828e^0.037^T	0.375	60	<0.01	1.448
NP3	R_s=2.663e^0.041^T	0.204	60	<0.01	1.507
NP1M3	R_s=2.906e^0.035^T	0.199	60	<0.01	1.419
NPK1	R_s=2.372e^0.041^T	0.269	60	<0.01	1.507
NPK2	R_s=2.818e^0.035^T	0.391	60	<0.01	1.419
NPK3	R_s=2.121e^0.047^T	0.448	60	<0.01	1.600
NPK1M3	R_s=3.001e^0.036^T	0.242	60	<0.01	1.433
NPK2M2	R_s=2.563e^0.042^T	0.297	60	<0.01	1.522
NPK3M1	R_s=2.683e^0.041^T	0.299	60	<0.01	1.507

处理	拟合方程	R2	样本数	P	土壤呼吸温度敏感性系数Q₁₀
M3	R_s=3.828e^0.037^T	0.375	60	<0.01	1.448
NP3	R_s=2.663e^0.041^T	0.204	60	<0.01	1.507
NP1M3	R_s=2.906e^0.035^T	0.199	60	<0.01	1.419
NPK1	R_s=2.372e^0.041^T	0.269	60	<0.01	1.507
NPK2	R_s=2.818e^0.035^T	0.391	60	<0.01	1.419
NPK3	R_s=2.121e^0.047^T	0.448	60	<0.01	1.600
NPK1M3	R_s=3.001e^0.036^T	0.242	60	<0.01	1.433
NPK2M2	R_s=2.563e^0.042^T	0.297	60	<0.01	1.522
NPK3M1	R_s=2.683e^0.041^T	0.299	60	<0.01	1.507

处理	拟合方程	R2	样本数	P	平均土壤湿度/%
M3	R_s=1.222θ²-0.051θ+1.791	0.113	60	<0.05	12.8
NP3	R_s=8.485e^-0.021^θ	0.077	60	<0.05	11.6
NP1M3	R_s=0.219θ²-0.013θ+6.090	0.154	60	<0.01	14.2
NPK1	R_s=0.346θ²-0.018θ+4.954	0.288	60	<0.01	13.3
NPK2	R_s=-0.119θ²+0.001θ+7.48	0.137	60	<0.05	13.3
NPK3	R_s=0.817θ²-0.040θ+2.472	0.364	60	<0.01	12.0
NPK1M3	R_s=0.782θ²-0.030θ+1.977	0.189	60	<0.01	14.3
NPK2M2	R_s=0.084θ²-0.010θ+7.206	0.266	60	<0.01	13.3
NPK3M1	R_s=0.571θ²-0.032θ+4.766	0.345	60	<0.01	11.8

Characteristics of soil respiration in farmland of Hexi oasis and its response to long-term fertilization

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处理	有机质/(g·kg^-1)	全氮/(g·kg^-1)	全磷/(g·kg^-1)	碱解氮/(mg·kg^-1)	pH值	容重/(g·cm^-3)	产量/(kg·hm^-2)
M3	23.57±0.98^a	2.00±0.08^a	1.40±0.04^c	99.25±2.73^a	8.58±0.02^b	1.25±0.05^b	13 456±617^ab
NP3	9.06±1.01^de	1.17±0.05^cd	1.85±0.09^b	40.82±4.21^cd	8.80±0.04^a	1.43±0.06^a	10 221±1000^b
NP1M3	10.24±0.12^d	1.31±0.03^c	1.49±0.03^c	48.27±1.60^c	8.78±0.01^a	1.46±0.02^a	11 943±470^b
NPK1	8.32±0.72^de	1.13±0.03^d	1.29±0.06^c	41.29±2.77^cd	8.84±0.01^a	1.47±0.01^a	11 465±834^b
NPK2	7.05±0.71^e	1.05±0.03^d	1.50±0.03^c	36.46±2.36^d	8.79±0.05^a	1.43±0.03^a	11 792±369^b
NPK3	9.10±0.27^de	1.15±0.03^cd	2.17±0.15^a	42.81±0.68^cd	8.61±0.08^b	1.43±0.01^a	12 812±719^ab
NPK1M3	21.94±1.21^a	1.93±0.10^a	1.68±0.03^bc	93.56±6.03^a	8.53±0.03^b	1.27±0.03^b	12 596±662^ab
NPK2M2	18.16±1.70^b	1.68±0.05^b	1.75±0.0^8b	73.75±5.72^b	8.52±0.01^b	1.31±0.02^b	14 111±755^a
NPK3M1	14.31±0.71^c	1.54±0.04^b	2.04±0.11^ab	65.28±2.92^c	8.52±0.03^b	1.38±0.02^ab	12 925±667^ab

指标	有机质	全氮	全磷	碱解氮	pH值	容重	产量
相关系数	0.484	0.497	-0.258	0.469	-0.112	-0.392	0.093
显著性	0.011	0.008	0.195	0.014	0.579	0.043	0.645

公因子	因素分量	特征值	贡献率/%	累积贡献率/%
F1	有机质、全氮、全碳、碱解氮、速效钾、容重	7.4	56.92	56.92
F2	砂粒、粉粒、黏粒	2.6	20.24	77.16
F3	全磷、速效磷	1.7	13.45	90.61

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