The establishment and development of Haloxylon ammodendron promotes salt accumulation in surface soil of arid sandy land

YongZhong Su; TingNa Liu; JunQia Kong

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The establishment and development of Haloxylon ammodendron promotes salt accumulation in surface soil of arid sandy land

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Haloxylon ammodendron, a representative C4 succulent xerophyte and salt-secreting plant, is widely used in vegetation re-establishment programs to stabilize shifting sand, and is one of the dominant shrubs in the shelter belt used to control de-sertification in the desert-oasis ecotone in northwestern China. In this study, we collected soil samples in an age sequence of 0-, 2-, 5-, 13-, 16-, 31-, and 39-year-old H. ammodendron plantations to assess the effects of the shrub on soil fertility and salinity. Results show that SOC and total N concentrations increased significantly with increasing plantation age and increased 5.95-(in the interspaces) to 9.05-fold (under the canopy) and 6.15-to 8.46-fold at the 0-5 cm depth at the 39-year-old plantation compared with non-vegetated sandy land. Simultaneously, H. ammodendron establishment and devel-opment resulted in significant salt accumulation in the surface layer. On average, total soil salt content at the 0-5 cm and 5-20 cm depth increased 16.8-fold and 4.4-fold, respectively, compared with non-vegetated sandy land. The increase of total salt derived mostly from the accumulation of SO2-4 , Ca2+and Na+with H. ammodendron development. The accumulation in salinity was more significant than the increase in fertility, suggesting that improved soil fertility did not limit the impact of salinization. The adverse effect of salt accumulation may result in H. ammodendron plantation degradation and impact community stability in the long run.

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《寒旱区科学（英文版）》 |2019年第2期|116-125|共10页
作者
YongZhong Su; TingNa Liu; JunQia Kong;
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作者单位

Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences/Key Laboratory of Eco-Hydrology in Inland River Basin,CAS,Lanzhou,Gansu 730000,China;

Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences/Key Laboratory of Eco-Hydrology in Inland River Basin,CAS,Lanzhou,Gansu 730000,China;

Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences/Key Laboratory of Eco-Hydrology in Inland River Basin,CAS,Lanzhou,Gansu 730000,China;

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The establishment and development of Haloxylon ammodendron promotes salt accumulation in surface soil of arid sandy land

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