Wang Yanwu,Sun Haofeng,Yu Hui,et al.Comprehensive Evaluation of Soil Quality of Different Shrubs in Windy Desert Area of Minqin[J].Research of Soil and Water Conservation,2024,31(03):169-178,186.[doi:10.13869/j.cnki.rswc.2024.03.009]
民勤风沙区不同灌木林土壤质量综合评价
- Title:
- Comprehensive Evaluation of Soil Quality of Different Shrubs in Windy Desert Area of Minqin
- 文章编号:
- 1005-3409(2024)03-0169-10
- Keywords:
- windy desert area; shrubbery; soil quality assessment; PCA
- 分类号:
- S714.6
- 文献标志码:
- A
- 摘要:
- [目的]研究风沙区灌木林土壤养分和生物学性质的变化特征,定量评价不同固沙灌木林土壤质量,对风沙区合理选择固沙树种和指导生态修复具有重要的现实意义。[方法]在民勤风沙区选取白刺(Nitraria tangutorum Bobr.)、红砂(Reaumuria songarica(Pall.)Maxim.)、沙拐枣(Calligonum mongolicum Turcz.)、膜果麻黄(Ephedra przewalskii Stapf)、黄花矶松(Limonium aureum(L.)Hill.)为研究对象,以裸沙地为对照,测定和分析了不同固沙灌木林土壤的养分、微生物数量和酶活性差异,采用主成分分析和土壤质量指数相结合的方法定量评价了不同固沙灌木对土壤质量的改良效果。[结果](1)民勤风沙区固沙灌木林土壤有机质和氮素含量较低,磷素缺乏,钾素含量较高,全盐量过低; 与裸沙地相比,研究区各固沙灌木林土壤有机质、氮素、磷素、钾素含量、微生物数量和酶活性均有所增加; 0—20 cm,20—40 cm,40—60 cm土层土壤养分含量均以红砂最高,土壤微生物数量和酶活性各固沙灌木林表现趋势各不相同;(2)各固沙灌木林随土层深度增加土壤微生物数量和酶活性变化规律各异,土壤养分含量逐渐减小,但各土层间差异不显著;(3)固沙灌木林土壤养分、盐分、微生物和酶活性之间相关性密切,土壤养分、微生物各指标间均呈极显著正相关关系(p<0.01);(4)不同固沙灌木林在不同土层对土壤质量的改良效果不同,0—20 cm土层综合得分排序为红砂>白刺>黄花矶松>沙拐枣>膜果麻黄>裸沙地,20—40 cm和40—60 cm均为红砂>白刺>沙拐枣>黄花矶松>膜果麻黄>裸沙地。[结论]红砂和白刺对土壤质量的改善效果最好,黄花矶松改善表层土壤质量的作用大于中下层土壤。
- Abstract:
- [Objective] The aims of this study are to analyze the characteristics of soil nutrients and biological properties of shrubbery in windy desert area, and to quantitatively assess soil quality of different sand-fixation shrubs, which is crucial for selecting the sand-fixation shrub species and guiding the ecological restoration. [Methods] The 5 sand-fixation shrub species(Nitraria tangutorum Bobr., Reaumuria songarica (Pall.)Maxim., Calligonum mongolicum Turcz., Ephedra przewalskii Stapf and Limonium aureum (L.)Hill.)in windy desert area of minqin were selected as the samples. The bare sandy land was set as the control, and the soil nutrient, microbial quantity and enzyme activity of 5 sand-fixation shrubs were measured and analyzed. At last the improving effects of 5 sand-fixation shrubs on soil quality were quantitatively evaluated by using principal component analysis and soil quality index. [Results](1)For 5 sand-fixation shrubs, the contents of soil organic matter and nitrogen were low, phosphorus was deficient, potassium was high, and total salt concentration was too low. Compare with bare sandy land soil, the contents of soil organic matter, nitrogen, phosphorus and potassium, microbial quantity and enzyme activity increased. For different soil layers(0—20 cm, 20—40 cm and 40—60 cm), the soil nutrition contents of Reaumuria songarica (Pall.)Maxim. were the highest among all shrub species. The soil microbial quantity and enzyme activity varied among all sand-fixation shrubs.(2)With the increase of soil depth, soil nutrient content gradually decreased but no significant difference between the soil layers, and the changes of soil microbial quantity and enzyme activity were different.(3)There were close correlations among soil nutrients, salt, microorganism and enzyme activity, among which soil nutrients and microorganism achieved a very significant positive correlation(p<0.01).(4)The improvement effect of different sand-fixation shrubs on soil quality varied in different soil layers. The sequence of 5 comprehensive scores were Reaumuria songarica (Pall.)Maxim.>Nitraria tangutorum Bobr.>Limonium aureum (L.)Hill.>Calligonum mongolicum Turcz.>Ephedra przewalskii Stapf>bare sandy land and Reaumuria songarica (Pall.)Maxim.>Nitraria tangutorum Bobr.>Calligonum mongolicum Turcz.>Limonium aureum (L.)Hill.>Ephedra przewalskii Stapf>bare sandy land for 0—20 cm and 20—40 cm, 40—60 cm soil layers, respectively. [Conclusion] This study suggests that Reaumuria songarica (Pall.)Maxim. and Nitraria tangutorum Bobr. can best improve the soil quality in windy desert area of Minqin. Limonium aureum (L.)Hill. can improve the soil quality of topsoil rather than that of middle and below soil.
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备注/Memo
收稿日期:2023-05-30 修回日期:2023-07-06
资助项目:甘肃省自然科学基金项目(21JR7RA683); 甘肃省科技重大专项项目(22ZD6GA055,21ZD4FA020); 甘肃省水利科学试验研究及技术推广计划项目(22GSLK007)
第一作者:王彦武(1982—),男,甘肃白银人,博士,正高级工程师,主要从事水土保持与荒漠化防治方面的研究。E-mail:wang_yanwu@163.com