黄土高原天然草地藻和藓结皮土壤养分特征与差异

发布时间：2018-07-21 18:55

【摘要】：采用野外调查和室内试验相结合的方法对黄土高原天然草地藻和藓结皮层及其下层土壤养分含量进行了分析比较。结果表明,藻和藓结皮的存在致使结皮层土壤养分的富集特征存在差异,藓结皮层土壤SOC、TN、TP、Na、Ca、Cu和Zn含量存在明显的富集现象,其富集系数分别为160.76%、49.68%、12.27%、8.70%、12.04%、25.00%和71.18%;而藻结皮层AN和AP含量有明显的富集,系数分别为241.38%和237.13%。另外,藓结皮SOC、TN、AN、TP、AP和K含量均显著高于藻结皮,而Ca含量则显著低于藻结皮。此外,藻和藓结皮层土壤养分含量的差异明显大于结皮下层,且藻和藓结皮不同土层土壤养分含量间的相关关系存在差别,其中藓结皮层SOC、TN、AN、Na和Cu均相互表现为正相关关系,而藻结皮层SOC、TN、AN、TP、AP和Na均相互正相关。因此,藻和藓结皮对草地土壤养分的富集和退化草地培育改良具有重要作用。
[Abstract]:The nutrient contents of natural grassland algae and mossy crust and their subsoil in Loess Plateau were analyzed and compared by means of field investigation and laboratory test. The results showed that the accumulation characteristics of nutrients in the soil were different due to the existence of algae and mosses crust, and the contents of Cu and Zn in the soil of SOCTNTP-TPN were obviously enriched. Its enrichment coefficient was 160.766.49.68 and 12.70% and 12.04%, respectively, while the contents of an and AP in the algal cortex were significantly enriched, and the coefficients were 241.38% and 237.13%, respectively. In addition, the contents of AP and K in SOCN ANN TPN were significantly higher than that in algal crust, but Ca content was significantly lower than that in algal crust. In addition, the difference of soil nutrient content between algal and mossy cortex was significantly greater than that in subcrust, and the correlation between soil nutrient content of algae and moss crust was different, among which SOC, TNANN, Na and Cu in mossy cortex were positively correlated with each other. There was a positive correlation between TPAP and Na in the algal cortex. Therefore, algae and moss crust play an important role in the enrichment of soil nutrients and the cultivation and improvement of degraded grassland.
【作者单位】：草地农业生态系统国家重点实验室/兰州大学草地农业科技学院;青海省海南藏族自治州兴海县气象局;
【基金】：国家重点研发计划(2016YFC0500506) 国家科技基础性工作专项(2012FY111900) 兰州大学中央高校基本科研业务费专项资金资助(lzujbky-2014-78);兰州大学“本科教学工程”国家级大学生创新创业训练计划(201510730100) 高等学校博士学科点专项科研基金(20120211110029) 长江学者和创新团队发展计划(IRT13019)资助
【分类号】：S812

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