Long-term effects of Haloxylon ammodendron plantations on topsoil carbon， nitrogen， phosphorus stoichiometry and stocks in the desert-oasis ecotone

doi:10.7522/j.issn.1000-694X.2025.00123

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (5): 241-252.DOI: 10.7522/j.issn.1000-694X.2025.00123

Long-**term effects of Haloxylon ammodendron plantations on topsoil carbon， nitrogen， phosphorus stoichiometry and stocks in the desert-oasis ecotone**

Ziting Wang¹^,²(), Jiliang Liu³, Yongzhong Luo¹(), Quanlin Ma¹^,²(), Xiaogan Zhou¹, Xin Luo¹, Wenzhen Zong²

^1.College of Forestry，Gansu Agricultural University，Lanzhou 730070，China
^2.Gansu Academy of Forestry Science，Lanzhou 730020，China
^3.Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China

Received:2025-03-28 Revised:2025-05-31 Online:2025-09-20 Published:2025-09-27
Contact: Yongzhong Luo, Quanlin Ma

Abstract

Abstract:

Artificial sand-fixing vegetation serves as a critical ecological barrier in desert-oasis ecotone， and its stability is closely linked to the effectiveness of regional ecological protection.As a representative type of sand-fixing vegetation， Haloxylon ammodendron plantations undergo distinct developmental phases over time， which markedly influence the soil environment and related ecological functions. To evaluate these effects， Haloxylon ammodendron plantations aged 5， 10， 20， and 30 years at the northern edge of the Zhangye Oasis were selected as study sites， with mobile and fixed sand dunes serving as controls. This study systematically investigated the physicochemical properties， nutrient contents， and ecological stoichiometry of topsoil， assessed the long-term impacts of plantation age on the carbon， nitrogen， and phosphorus stoichiometry and their stocks， and further examined the coupled interactions between biotic and abiotic factors， along with the feedback mechanisms that drive the restoration dynamics of artificial sand-fixing ecosystems. The study found that surface soil C∶N ratios were significantly higher in fixed duns than in mobile dunes， while the N∶P ratios exhibited the opposite trend. The establishment of H. ammodendron plantation gradually decreased surface soil C∶N ratios and increased N∶P ratios， with a distinct pattern observed in the 30-year-old H. ammodendron plantation， where C∶N ratios increased and N∶P ratios decreased. H. ammodendron plantations significantly increased topsoil organic carbon and inorganic nitrogen stocks 10 years after establishment. Meanwhile， total nitrogen and total phosphorus stocks increased with planting age， with the highest total nitrogen stock observed in the 20-year-old H. ammodendron plantation. Shrub cover， herbaceous cover， macro-arthropods， and soil silt and clay content explained 67.89% of the variation in surface soil carbon， nitrogen， and phosphorus stoichiometry. Shrub cover， herbaceous cover， macro-arthropods， soil silt and clay content， soil pH， and soil salt content explained 70.70% of the variation in surface soil carbon， nitrogen， and phosphorus stock. In summary， the establishment of H. ammodendron plantations led to a continuous decline in herbaceous cover and soil pH over time， while shrub cover， soil silt and clay， the macro-arthropods activity density， and soil salt content increased primarily during the pre- and mid-establishment stages. Together， these changes played a key role in driving variations in surface soil carbon， nitrogen， and phosphorus stoichiometry and stock.

Key words: desert-oasis ecotone, mobile and fixed sandy dune, Haloxylon ammodendron plantations, soil carbon， nitrogen and phosphorus stoichiometry, soil carbon， nitrogen and phosphorus stock

CLC Number:

Q948.113

Ziting Wang, Jiliang Liu, Yongzhong Luo, Quanlin Ma, Xiaogan Zhou, Xin Luo, Wenzhen Zong. Long-term effects of Haloxylon ammodendron plantations on topsoil carbon， nitrogen， phosphorus stoichiometry and stocks in the desert-oasis ecotone[J]. Journal of Desert Research, 2025, 45(5): 241-252.

Figures/Tables 5

Fig.1 The ratios of topsoil organic carbon， total nitrogen， and total phosphorus in mobile sandy dunes （MSD）， fixed sandy dunes （FSD）， and Haloxylon ammodendron plantations （Ys）

Fig.2 The storages of topsoil organic carbon， total nitrogen， inorganic nitrogen， and total phosphorus in mobile sandy dunes （MSD）， fixed sandy dunes （FSD）， and Haloxylon ammodendron plantations （Ys）

Fig.3 Changes in topsoil organic carbon， total nitrogen， inorganic nitrogen and total phosphorus stocks during the restoration of Haloxylon ammodendron plantations

Table 1 pRDA to quantify the relative contributions of the relative influence of biotic and abiotic factors on alterations in the ratios and stocks of topsoil organic carbon， total nitrogen and total phosphorus

变量	特征值（校准）	解释量	贡献率	F	P
表层碳氮磷比值
SC	0.541	54.05	79.61	91.2	0.001
HC	0.067	6.68	9.85	13.2	0.002
MA	0.035	3.53	5.2	7.7	0.002
ME	0.003	0.29	0.42	0.7	0.443
SCC	0.016	1.62	2.39	3.7	0.044
pH	0.011	1.15	1.69	2.6	0.089
SSC	0.006	0.57	0.84	1.4	0.235
表层碳氮磷储量
SC	0.151	15.08	21.33	27.2	0.001
HC	0.014	1.44	2.04	3.7	0.029
MA	0.032	3.17	4.48	7.5	0.004
ME	0.002	0.19	0.27	0.4	0.682
SCC	0.427	42.75	60.46	56.1	0.001
pH	0.063	6.34	8.97	13.5	0.001
SSC	0.017	1.73	2.45	4.3	0.019

Fig.4 The RDA two-dimensional ordination diagram of the ratios （A） and stocks （B） of topsoil organic carbon， total nitrogen and total phosphorus with biotic and abiotic factors among mobile sandy dune （MSD）， fixed sandy dune （FSD） and Haloxylon ammodendron plantations （Ys）

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Long-**term effects of Haloxylon ammodendron plantations on topsoil carbon， nitrogen， phosphorus stoichiometry and stocks in the desert-oasis ecotone**

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