黑河下游胡杨林土壤碳空间分异特征及其影响因素

doi:10.12118/j.issn.1000-6060.2024.125

Abstract

Abstract:

The distribution of soil carbon in desert riparian forests is shaped by multiple factors. This study examines the Ejina Oasis in the lower reaches of the Heihe River, China. Soil samples from 20 Populus euphratica Oliv. plots at depths of 0-100 cm were analyzed to investigate the spatial variation of soil organic carbon (SOC) and soil inorganic carbon (SIC) and their influencing factors. The results reveal: (1) The mean SOC and SIC contents in the 0-100 cm soil layer were 2.90 g·kg^-1 and 10.79 g·kg^-1, respectively, with SIC being 3.72 times of SOC. (2) Vertically, both SOC and SIC contents exhibited a declining trend with increasing soil depth, while horizontally, SOC and SIC from the upper to lower sections of East River of the Heihe River show a decreasing trend, but the total amount of SIC is still greater than SOC. This suggests that inorganic carbon predominates in the lower reaches of inland rivers in arid regions. (3) Soil physical and chemical properties showed a stronger explanatory power for SOC, whereas their influence on SIC was comparatively lower. Specifically, soil chemical properties such as electrical conductivity (EC), sodium ion (Na⁺), sulfate (SO₄^2-), chloride ion (Cl^-), calcium ion (Ca²⁺), magnesium ion (Mg²⁺), and potassium ion (K⁺) had the most significant influence on SOC. In conclusion, the soil carbon pool in desert riparian forests in the lower reaches of inland river basins in arid areas is predominantly composed of SIC, with notable spatial variations in both horizontal and vertical directions. Basic cations are identified as the primary factor influencing SOC spatial differentiation, while soil sand content and bulk density are the key factors affecting SIC spatial differentiation.

Key words: riparian Populus euphratica Oliv. forest, soil carbon, distribution characteristics, influencing factor, Heihe River Basin

YIN Yidan, YU Tengfei, HAN Tuo, TAN Tianyi, CHEN Xiaoling. Spatial differentiation and its influencing factors of soil carbon in Populus euphratica Oliv. forest in the lower reach of Heihe River[J].Arid Land Geography, 2025, 48(1): 94-104.

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References 36

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深度/cm	SOC/g·kg^-1	SIC/g·kg^-1	SIC:SOC
0~10	6.22±1.18^a	12.87±1.71^a	3.87±0.65^a
10~20	3.38±0.55^b	11.69±0.76^a	5.01±0.63^ab
20~40	2.28±0.29^b	10.89±0.75^a	5.80±0.52^ac
40~60	2.13±0.29^b	10.98±0.82^a	6.29±0.53^ac
60~80	1.93±0.45^b	9.11±1.05^a	6.77±0.65^bc
80~100	1.46±0.27^b	9.18±0.99^a	7.89±0.99^c

区域	SOC/g·kg^-1	SIC/g·kg^-1	SIC:SOC
西河干流河岸带	18.21±3.19^a	54.98±8.14^a	4.88±0.72^a
东河中上游河岸带	20.34±7.89^a	69.45±12.48^a	6.19±1.31^a
东河下游河岸带	17.39±2.46^a	70.61±3.87^a	6.17±0.55^a
东河下游绿洲核心区	13.66±2.74^a	63.87±5.09^a	6.52±0.35^a

深度 /cm	SWC /%	EC /μS·cm^-1	BD /g·cm^-3	Clay /%	Silt /%	Sand /%	pH	Na⁺ /mg·kg^-1	K⁺ /mg·kg^-1	Mg²⁺ /mg·kg^-1	Ca²⁺ /mg·kg^-1	Cl^- /mg·kg^-1	SO₄^2- /mg·kg^-1	NO₃^- /mg·kg^-1	NH₄⁺ /mg·kg^-1	F^- /mg·kg^-1
0~10	2.67^a	6565.01^a	1.20^a	0.94^a	16.39^a	82.34^a	8.26^a	12661.18^a	2054.27^a	2437.60^a	2557.03^a	15192.84^a	36185.14^a	68.89^a	26.24^a	3.26^a
10~20	4.05^a	1673.37^b	1.33^a	1.24^a	21.31^a	77.41^a	8.26^a	2201.89^b	440.93^a	512.98^ab	716.86^b	2369.10^ab	3790.51^b	308.73^a	2.69^b	2.01^a
20~40	4.81^a	864.35^b	1.34^ab	0.93^a	19.37^a	79.70^a	8.32^a	862.98^b	219.97^a	234.56^b	448.77^b	735.14^b	1682.19^b	126.49^a	1.91^b	2.27^a
40~60	6.08^a	668.27^b	1.35^ab	1.28^a	23.51^a	75.21^a	8.29^a	597.67^b	166.50^a	165.39^b	270.33^b	522.72^b	870.95^b	75.26^a	1.44^b	1.86^a
60~80	4.24^a	511.39^b	1.43^ab	1.12^a	17.20^a	81.68^a	8.25^a	461.83^b	128.85^a	158.42^b	208.77^b	373.32^b	691.78^b	40.03^a	1.65^b	2.28^a
80~100	4.41^a	549.81^b	1.40^b	0.65^a	12.18^a	87.09^a	8.26^a	476.96^b	94.68^a	174.27^b	234.79^b	411.50^b	725.31^b	33.74^a	1.41^b	2.31^a

区域	SWC /%	EC /μS·cm^-1	BD /g·cm^-3	Clay /%	Silt /%	Sand /%	pH	Na⁺ /mg·kg^-1	K⁺ /mg·kg^-1	Mg²⁺ /mg·kg^-1	Ca²⁺ /mg·kg^-1	Cl^- /mg·kg^-1	SO₄^2- /mg·kg^-1	NO₃^- /mg·kg^-1	NH₄⁺ /mg·kg^-1	F^- /mg·kg^-1
西河干流河岸带	3.41^a	1643.04^a	1.47^a	0.99^a	17.81^a	81.17^a	8.30^a	12837.45^a	1392.28^a	3782.32^a	4970.43^a	9943.69^a	28759.40^a	175.53^a	25.49^a	19.01^a
东河中上游河岸带	5.30^a	3059.05^a	1.45^a	1.30^a	21.88^a	76.64^a	8.25^a	34032.60^a	2746.63^a	7250.30^a	3711.86^a	28250.52^a	56831.60^a	1523.25^a	9.09^a	15.54^a
东河下游河岸带	4.40^a	2063.75^a	1.12^b	0.84^a	19.14^a	79.94^a	8.25^a	20224.23^a	7124.88^a	2839.65^a	7440.17^a	38355.39^a	86618.00^a	404.57^a	42.15^a	7.41^a
东河下游绿洲核心区	4.40^a	455.63^a	1.33^ab	0.98^a	14.48^a	84.54^a	8.29^a	1955.77^a	1157.02^a	860.60^a	1623.78^a	1868.88^a	3574.50^a	509.24^a	5.49^a	5.12^a

环境因子组合	SOC	SIC
土壤综合性质	0.02	0.01
土壤物理性质	0.04	0.10
土壤化学性质	0.37	0.03
土壤综合性质×土壤物理性质	0.06	0.11
土壤综合性质×土壤化学性质	-0.01	0.01
土壤物理性质×土壤化学性质	0.07	-0.02
土壤综合性质×土壤物理性质×土壤化学性质	0.02	-0.01
残差项	0.28	0.68

Spatial differentiation and its influencing factors of soil carbon in Populus euphratica Oliv. forest in the lower reach of Heihe River

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