Characteristics of soil carbon and nitrogen change in three typical plant communities in desert riparian forest area

doi:10.7522/j.issn.1000-694X.2022.00116

Journal of Desert Research ›› 2023, Vol. 43 ›› Issue (1): 150-159.DOI: 10.7522/j.issn.1000-694X.2022.00116

Characteristics of soil carbon and nitrogen change in three typical plant communities in desert riparian forest area

Yuqing Chen¹^,²(), Haiyang Xi¹(), Wenju Cheng¹^,², Xinyue Zhao¹^,²

^1.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China
^2.University of Chinese Academy of Sciences，Beijing 100049，China

Received:2022-08-04 Revised:2022-09-21 Online:2023-01-20 Published:2023-01-17
Contact: Haiyang Xi

Abstract

Abstract:

Taking the soils under the 3 vegetation types of desert riparian forest in the lower reaches of the Heihe River as the research object， the variation characteristics of soil carbon and nitrogen from 0-280 cm were analyzed by means of field sampling and laboratory analysis. Pearson correlation analysis and path analysis methods were used to reveal the relationship between soil carbon， nitrogen and physicochemical properties. The results showed that：（1） The average soil carbon content under the planting covers of Sophora alopecuroides， Populus euphratica， Tamarix ramosissima was 16.35， 20.23， 17.23 mg·g^-1， respectively， and the average nitrogen content was 0.47， 0.69， 0.61 mg·g^-1， respectively. The difference in soil carbon and nitrogen content due to vegetation type was mainly manifested in the surface layer of 0-10 cm. （2） Soil carbon storage in the desert riparian forest area of 0-160 cm was shown as Tamarix ramosissima （444.64 t·hm^-2）>Populus euphratica （398.60 t·hm^-2）>Sophora alopecuroides （368.95 t·hm^-2）， and soil nitrogen storage was Tamarix ramosissima （12.46 t·hm^-2）>Populus euphratica （11.88 t·hm^-2）>Sophora alopecuroides （10.60 t·hm^-2）. （3） The correlation analysis between soil carbon and nitrogen content and physical and chemical properties showed that organic matter， total phosphorus， available phosphorus， alkaline nitrogen， available potassium， conductivity and carbon and nitrogen content were positively correlated （P<0.01）， and pH， bulk weight and carbon and nitrogen content were negatively correlated （P<0.01）. The results of this study can provide a reference for the study of the spatial pattern of carbon and nitrogen in the desert riparian zone in arid areas.

Key words: total carbon, total nitrogen, desert riparian forests, soil physicochemical properties, path analysis

CLC Number:

S153

Yuqing Chen, Haiyang Xi, Wenju Cheng, Xinyue Zhao. Characteristics of soil carbon and nitrogen change in three typical plant communities in desert riparian forest area[J]. Journal of Desert Research, 2023, 43(1): 150-159.

Figures/Tables 11

Fig. 1 Sample plot distribution in the study area

Table 1 Basic situation about the vegetation of the sample land

样地	与河道距离/m	平均高度/m	平均胸径/cm	平均密度/（株·hm^-2）	立地条件
苦豆子	50	0.43	0.57	28 800	草地
胡杨	300	12.10	60.96	283	林间地
柽柳	500	2.20	3.10	1 775	柽柳冠下

Table 2 Average soil carbon and nitrogen content（mg·g-1 ）

土壤养分	苦豆子	胡杨	柽柳	平均
碳	16.35±0.13^a	20.23±2.36^a	17.23±2.64^a	17.94±1.66
氮	0.47±0.03^b	0.69±0.07^a	0.61±0.07^ab	0.59±0.09

Fig. 2 Vertical change trend of soil carbon and nitrogen content

Table 3 Average soil carbon and nitrogen storage（t·hm-2 ）

土壤深度 /cm	碳储量			氮储量
土壤深度 /cm	苦豆子	胡杨	柽柳	苦豆子	胡杨	柽柳
0~160	368.95	398.60	444.64	10.60	11.88	12.46
0~280	—	713.42	665.95	—	21.64	22.76

Fig. 3 Vertical change trend of soil carbon and nitrogen storage

Fig. 4 Trends in soil physicochemical properties

Fig.5 Correlation between soil carbon and nitrogen content and physicochemical properties

Table 4 Regression equation for soil carbon and nitrogen content and physicochemical properties

因变量y	回归方程	R²	P
碳含量 $y C$	$y C = 0.101 A N + 17.338 T P + 4.809 P H - 52.717$	0.829	0.00^**
氮含量 $y N$	$y N = 0.004 A N + 0.001 A K + 0.171 B D - 0.022$	0.935	0.00^**

Table 4 Regression equation for soil carbon and nitrogen content and physicochemical properties

因变量y	回归方程	R²	P
碳含量 $y C$	$y C = 0.101 A N + 17.338 T P + 4.809 P H - 52.717$	0.829	0.00^**
氮含量 $y N$	$y N = 0.004 A N + 0.001 A K + 0.171 B D - 0.022$	0.935	0.00^**

Fig. 6 Path analysis of soil carbon and nitrogen content and physicochemical properties

Table 5 Leaf carbon and nitrogen content of major vegetation

植物	碳含量/（mg·g^-1）	氮含量/（mg·g^-1）	数据来源
苦豆子	391.4	13.7	[25]
胡杨	435.1	14.9	[26]
多枝柽柳	380.27	30.42	[27]

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Characteristics of soil carbon and nitrogen change in three typical plant communities in desert riparian forest area

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