Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Soil Science submitted time 2024-01-12 Cooperative journals: 《干旱区科学》
Abstract： Vegetation restoration through artificial plantation is an effective method to combat desertification, especially in arid and semi-arid areas. This study aimed to explore the ecological effect of the plantation of Sabina vulgaris on soil physical and chemical properties on the southeastern fringe of the Mu Us Sandy Land, China. We collected soil samples from five depth layers (0–20, 20–40, 40–60, 60–80, and 80–100 cm) in the S. vulgaris plantation plots across four plantation ages (4, 7, 10, and 16 years) in November 2019, and assessed soil physical (soil bulk density, soil porosity, and soil particle size) and chemical (soil organic carbon (SOC), total nitrogen (TN), available nitrogen (AN), available phosphorus (AP), available potassium (AK), cation-exchange capacity (CEC), salinity, pH, and C/N ratio) properties. The results indicated that the soil predominantly consisted of sand particles (94.27%–99.67%), with the remainder being silt and clay. As plantation age increased, silt and very fine sand contents progressively rose. After 16 years of planting, there was a marked reduction in the mean soil particle size. The initial soil fertility was low and declined from 4 to 10 years of planting before witnessing an improvement. Significant positive correlations were observed for the clay, silt, and very fine sand (mean diameter of 0.000–0.100 mm) with SOC, AK, and pH. In contrast, fine sand and medium sand (mean diameter of 0.100–0.500 mm) showed significant negative correlations with these indicators. Our findings ascertain that the plantation of S. vulgaris requires 10 years to effectively act as a windbreak and contribute to sand fixation, and needs 16 years to improve soil physical and chemical properties. Importantly, these improvements were found to be highly beneficial for vegetation restoration in arid and semi-arid areas. This research can offer valuable insights for the protection and restoration of the vegetation ecosystem in the sandy lands in China.
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2018-06-10 Cooperative journals: 《干旱区研究》
Abstract： 光抑制现象普遍存在于自然条件下生长的植物中，为了物种的延续，植物在长期的适应和进化过程中，形成了多种光抑制防御机制。臭柏(Sabina vulgaris Ant.)是毛乌素沙地唯一的天然常绿针叶灌木，在沙漠强光环境下完成更新，其热耗散等光抑制防御机制必然发挥重要作用。通过简要综述植物光抑制现象，以及强光下植物主要的光抑制防御机制，对臭柏光抑制防御机制研究现状进行梳理和展望。总体而言，有关臭柏光抑制防御机制的研究尚属初步探索阶段，臭柏应对光抑制的生理机理和分子机制尚不明确，从分子层面研究毛乌素沙地臭柏抵御光抑制的机制，可揭示臭柏是如何通过光抑制防御机制来适应恶劣的沙漠环境。
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