| 摘要: |
| 【目的】研究中国西北罗布麻能否引入辽西北风沙地，揭示罗布麻的生长特性和固土作用。【方法】以罗布红麻和大花白麻为研究对象，研究4（M1）、3（M2）、2株/m2（M3）3种种植密度下罗布麻的生长指标、根系力学性能及土壤改良效果。【结果】随着生长周期的延长，罗布红麻和大花白麻的株高、冠幅、分枝数、地上部生物量均呈增长趋势，长势良好，地上部生物量最大值可达133.56 g/m2（M1）和103.64 g/m2（M2）；罗布红麻和大花白麻的根系生物量分别为61.32（M1）、27.39（M2）、23.12 g/cm2（M3）和72.84（M1）、34.95（M2）、36.1 g/cm2（M3），根系抗拉力分别为24.62（M1）、32.67（M2）、22.39 N（M3）和32.54（M1）、30.64（M2）、31.77 N（M3），根系抗拉强度分别为6.08（M1）、6.31（M2）、5.20 MPa（M3）和5.32（M1）、5.81（M2）、5.30 MPa（M3）；罗布麻根系抗拉力、抗拉强度与根系直径呈幂函数关系，回归效果达到极显著水平，决定系数分别为0.866、0.880和0.305、0.625。罗布红麻和大花白麻的土壤体积质量、最大持水量、毛管持水量、稳定入渗率均无显著差异，其数值大小与罗布麻种植密度呈正比，与土层深度呈反比。【结论】罗布麻在辽西北风沙地长势良好，成活率较高，根系具有一定的蓄水保土功能，但由于种植时间短，罗布麻对风沙土的改良效果一般。 |
| 关键词: 罗布麻；辽西北风沙地；生态学特性；抗拉强度；土壤改良 |
| DOI：10.13522/j.cnki.ggps.2025270 |
| 分类号: |
| 基金项目: |
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| Growth and soil quality improvement potential of introduced Apocynum venetum in Northwestern Liaoning Province |
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LYU Jinhao, LYU Linyou, LI Wanzhuo
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Institute of Sand Management and Utilization of Liaoning Province, Fuxin 123000, China
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| Abstract: |
| 【Objective】Wind-sandy lands in Northwestern Liaoning Province are highly susceptible to soil erosion and desertification, posing threats to local agriculture and ecosystem stability. Apocynum venetum, a hardy shrub native to Northwestern China, has the potential for soil stabilization and water retention in sandy soils. This study evaluates the feasibility of introducing A. venetum to improve the quality of wind-sandy soils in this region.【Method】Apocynum venetum and Poacynum hendersonii were used as the model plants and grown in three different planting densities (M1-M3). During the experiment, we measured growth traits of the plants, including their root mechanical properties, and assumed soil quality improvement.【Result】With increasing growth duration, plant height, crown width, branch number, and aboveground biomass of both species increased. Maximum aboveground biomass reached 133.56 g/cm2 for A. venetum in M1 and 103.64 g/m2 for P. hendersonii in M2. Root biomass of A. venetum was 61.32 g/cm2 in M1, 27.39 g/cm2 in M2, and 23.12 g/cm2 in M3, while that of P. hendersonii was 72.84 g/cm2, 34.95 g/cm2 and 36.1 g/cm2 in M1, M2 and M3, respectively. Root tensile resistance of A. venetum in M1, M2 and M3 was 24.62 N, 32.67 N, and 22.39 N respectively, and their associated tensile strength was 6.08 MPa, 6.31 MPa and 5.20 MPa in M1, M2 and M3. The tensile resistance of P. hendersonii in M1, M2 and M3 was 32.54 N, 30.64 N and 31.77 N, respectively, and their associated tensile strength was 5.32 MPa, 5.81 MPa and 5.30 MPa. Both root tensile resistance and strength increased with root diameter in power-law functions, with determination coefficients of 0.866 and 0.880 for A. venetum, and 0.305 and 0.625 for P. hendersonii. No significant differences were found between the two species in soil bulk density, maximum water-holding capacity, capillary water-holding capacity, and stable infiltration rate. These soil properties were positively correlated with A. venetum planting density and inversely correlated with soil depth. 【Conclusion】Apocynum venetum exhibited high survival in the wind-sandy lands of Northwestern Liaoning Province. Its root system contributes to water retention and soil conservation. However, the long-term effects of A. venetum on soil quality require further investigation. |
| Key words: Apocynum venetum; wind sandy land in Northwestern Liaoning Province; ecological characteristics; tensile strength; soil improvement |
