三峡库区消落带几种草地根系分布及土壤养分变化
Root Distributions of Several Grasslands and Soil Nutrient Variation in the Riparian Zone of Three Gorges Reservoir
查看参考文献27篇
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文摘
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为明确三峡水库消落带典型草本植物根系分布及土壤养分的变化,在三峡腹地忠县石宝镇消落带选取牛鞭草(Hemarthria altissima)、扁穗牛鞭草(Hemarthria com pressa)、双穗雀稗(Paspalum paspaeoides)和自然恢复草地,利用WinRhizo Pro. 2009 c根系分析系统和常规统计方法对比研究了4种典型草地植物根系在土壤剖面分布及其对土壤剖面养分的影响。结果表明:四种草地的根系大部分都分布在0-5 cm土层中,根长密度(Root length density,RLD)、根面积比(Root area ratio,RAR)均沿土壤深度程幂函数递减分布。植被及其根系的存在对土壤养分的剖面分布有重要影响。裸地的土壤有机碳(Soil organic carbon,SOC)和总N含量要显著低于草地,扁穗牛鞭草和自然恢复杂草地的全量养分大都要高于其他草地。四种草地类型的RLD,RAR与SOC、总N含量均有显著(p<0.05)或极显著(p<0.01)相关。可见本研究涉及几种植物的根系对土壤养分分布有重要影响。研究结果可以为三峡水库消落带植被恢复和水土保持提供一定的依据。 |
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其他语种文摘
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To understand the root distribution in the soil profile and its influence on soil nutrients, roots of Hemarthria altissima,Hemarthria compressa,Paspalum paspaeoides and natural recovery grass and soils from these grasslands were investigated in the riparian zone of Three Gorges Reservoir. Root analysis systems (WinRHIZO Pro. 2009c) was used to characterize the root systems and conventional statistical analysis methods were used to describe root distributions in soil profiles and their relationship with soil nutrients. The results showed that roots mainly distributing in 0-5 cm soil layer, root length density (RLD) and root area ratio (RAR) decreased as the power law function with soil depth. The plant and root systems have significant impact on the distributions of soil nutrients in soil profiles. Soil organic carbon (SOC) and total N content in the bare land were significantly lower than those in the grasslands. Total nutrients in H. compressa land and natural recovery land were higher than those in the other grasslands. The RLD and RAR were significantly correlated with SOC and total N content in four studied grasslands. |
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来源
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水土保持研究
,2015,22(2):151-157 【扩展库】
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关键词
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根系分布
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土壤养分
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植被恢复
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三峡水库
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消落带
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地址
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中国科学院成都山地灾害与环境研究所, 中国科学院山地表生过程与生态调控重点实验室, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-3409 |
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学科
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农业基础科学 |
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基金
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中国科学院西部之光人才培养计划
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国家科技支撑计划项目
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国家自然科学基金国家杰出青年科学基金
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中国科学院知识创新工程西部行动计划项目
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文献收藏号
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CSCD:5412318
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