引用本文:
【打印本页】   【HTML】   【下载PDF全文】   查看/发表评论  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 63次   下载 34 本文二维码信息
码上扫一扫!
分享到: 微信 更多
滇东岩溶山地不同类型云南松林地土壤团聚体稳定性差异
方薇1,2, 范弢1
1.云南师范大学 旅游与地理科学学院, 云南 昆明 650500;2.云南省高原地理过程与环境变化重点实验室, 云南 昆明 650500
摘要:
[目的] 研究滇东岩溶山地不同类型云南松林地土壤团聚体稳定性差异,为岩溶脆弱生境土壤培肥、质量提升、水土固持提供依据。[方法] 通过野外调查和室内分析,研究了滇东岩溶山地云南松纯林、云南松人工混交林、云南松天然混交林、灌丛和原生林5种植被类型水稳性团聚体及团聚体有机碳分布特征,揭示不同类型云南松林团聚体稳定性差异。[结果] ①云南松纯林、人工混交林和天然混交林的<0.25 mm粒径质量分数(5.77%~9.39%)显著低于灌丛(20.92%)和原生林(27.47%)(p<0.05),且人工混交林和天然混交林>5 mm,2~5 mm粒径质量分数高于纯林。②湿筛处理的>0.25 mm水稳性团聚体比例(R0.25)排序为:人工混交林 > 天然混交林 > 纯林>灌丛 > 原生林;平均重量直径(MWD)排序为:人工混交林 > 天然混交林 > 原生林 > 灌丛 > 纯林;几何平均直径(GMD)排序为:人工混交林 > 天然混交林 > 原生林 > 纯林 > 灌丛;分形维数(D)排序为:原生林 > 灌丛 > 纯林 > 天然混交林 > 人工混交林。③纯林、人工混交林、天然混交林的大粒级团聚体(>0.25 mm)对土壤有机碳的贡献率高于小粒级团聚体(<0.25 mm),且>5,2~5,<0.25 mm粒径水稳性土壤团聚体有机碳含量均显著小于灌丛、原生林(p<0.05)。[结论] 云南松人工混交林的土壤团聚体稳定性最高,其养分积累和固碳能力低于灌丛和原生林,高于纯林,作为该区域水土保持的主要植被类型时需要避免人为干扰以提高土壤养分。
关键词:  水稳性团聚体  土壤结构稳定性  岩溶山地  滇东  云南松
DOI:10.13961/j.cnki.stbctb.2020.03.014
分类号:S152.4+9
基金项目:国家自然科学基金项目“滇东岩溶高原云南松水源林产水功能恢复机理研究”(41661004)
Differences in Soil Aggregate Stability of Different Species of Pinus Yunnanensis in Karst Mountain Area of Eastern Yunnan Province
Fang Wei1,2, Fan Tao1
1.College of Tourism and Geography, Yunnan Normal University, Kunming, Yunnan 650500, China;2.Yunnan Provincial Key Laboratory of Plateau Geographical Processes and Environment Change, Kunming, Yunnan 650500, China
Abstract:
[Objective] The soil aggregate stability of different species of Pinus yunnanensis in the karst mountain area of Eastern Yunnan Province was studied to provide a basis for soil cultivation, quality improvement, and soil-water conservation of karst fragile habitats.[Methods] Based on the field survey and laboratory analysis, five types of vegetation, namely P. yunnanensis pure forest, P. yunnanensis artificial mixed forest, P. yunnanensis natural mixed forest, shrub, and primeval forest, in the karst mountains of Eastern Yunnan Province were studied in terms of their characteristics of water-stable aggregate and organic carbon distribution in aggregate, which revealed the differences in the soil aggregate stability of different species of P. yunnanensis.[Results] ① The mass fraction of particle size <0.25 mm (5.77%~9.39%) of P. yunnanensis pure forest, artificial mixed forest, and natural mixed forest was significantly lower than that of shrub (20.92%) and primeval forest (27.47%) (p<0.05). The mass fraction of particle size >5 mm and 2~5 mm of artificial mixed forest and natural mixed forest was higher than that of pure forest. ② The proportion order of water-stable aggregate >0.25 mm (R0.25) after wet sieving treatment was P. yunnanensis artificial mixed forest > P. yunnanensis natural mixed forest > P. yunnanensis pure forest > shrub > primeval forest. The mean weight diameter order was P. yunnanensis artificial mixed forest > P. yunnanensis natural mixed forest > primeval forest > shrub > P. yunnanensis pure forest. The geometric mean diameter order was P. yunnanensis artificial mixed forest > P. yunnanensis natural mixed forest > primeval forest > P. yunnanensis pure forest > shrub. The fractal dimension order was primeval forest > shrub > P. yunnanensis pure forest > P. yunnanensis natural mixed forest > P. yunnanensis artificial mixed forest. ③ The contribution rate of large aggregates (>0.25 mm) of P. yunnanensis pure forest, P. yunnanensis artificial mixed forest, and P. yunnanensis natural mixed forest to soil organic carbon was higher than that of small aggregates (<0.25 mm), and the content of organic carbon in soil aggregates with particle sizes of 5, 2~5, and <0.25 mm was significantly lower than that of shrub and primeval forest (p<0.05).[Conclusion] P. yunnanensis artificial mixed forest was observed to have the maximum soil aggregate stability, and its nutrient accumulation and carbon sequestration were lower than those of shrub and primeval forest but higher than those of pure forest. When the P. yunnanensis artificial mixed forest was planted as the main vegetation type for soil and water conservation in this region, it was necessary to avoid human interference for the purpose of improvement of soil nutrients.
Key words:  water-stable aggregate  soil structural stability  karst mountains  Eastern Yunnan Province  Pinus yunnanensis