不同林分类型闽楠人工林土壤养分对比分析

发布时间：2018-09-06 16:08

【摘要】：为了研究不同林分类型闽楠人工林土壤氮、磷、钾元素含量以及其随土壤层次分布的变化规律。以湖南省金洞林场14年生闽楠-木荷混交林、14年生闽楠纯林、杉木林下补植4年生闽楠-木荷混交林,4年生闽楠纯林为研究对象,对4层深度(0~20、20~30、30~45、45~60 cm)土壤的氮、磷、钾等养分实测数据进行对比分析。结果如下:氮、全钾元素含量在整个土层(0~60 cm)中、速效磷元素含量在20~60 cm土层中14年生闽楠—木荷混交林较14年生闽楠纯林多28.15%、23.82%、11.49%,全磷及速效钾元素含量14年生纯林较混交林多65.97%、26.95%。林下补植4年生闽楠混交林林分土壤中表层和底层速效氮较4年生闽楠纯林多21.31%、16.22%;磷及速效钾元素含量在整个土层(0~60 cm)中较4年生闽楠纯林多92.53%、16.11%,4年生闽楠纯林土壤中全氮及全钾含量较林下补植混交林多8.74%、23.90%。这些结果表明14年生闽楠—木荷混交林土壤养分水平较14年生闽楠纯林高,杉木林下补植4年生闽楠混交林分土壤速效元素含量比4年生闽楠纯林多,营造闽楠—木荷混交林可以改善由于杉木连载造成的地力衰退,为闽楠人工林近自然经营提供理论依据。
[Abstract]:In order to study the changes of soil nitrogen, phosphorus and potassium contents and their distribution with soil layers in different stand types of South Minnan plantation. Based on the mixed forest of 14 years old Minnan and Schima superba in Jindong Forest Farm of Hunan Province, 14 years old pure forest of Minnan, 4 years old of Chinese fir forest and 4 years old of pure forest of 4 years old Minnan, the soil nitrogen and phosphorus of 4 layers (0 0. 20 0. The measured data of potassium and other nutrients were compared and analyzed. The results were as follows: the contents of nitrogen and total potassium in the whole soil layer (0 ~ 60 cm), the content of available phosphorus in the soil layer of 20 ~ 60 cm, the contents of available phosphorus in the mixed forest of 14 years old Minnan and Schima superba were 28.15 1523.8222.49% higher than that of the pure forest of 14 years old, and the contents of total phosphorus and available potassium in the pure forest of 14 years old were 65.97% and 26.95% more than those in the mixed forest. The available nitrogen in the soil surface and bottom layer of 4-year-old mixed stands of Minnan and Minnan were 21.31 and 16.222.The contents of phosphorus and available potassium in the whole soil layer (0 ~ 60 cm) were 92.53% and 16.11% more than those in the pure stand of 4 years old Minnan, and the soil of 4-year-old pure forest of Minnan was higher than that of the pure forest of 4 years old (0 ~ 60 cm), and the soil content of 4 years old was higher than that of the pure forest of 4 years old Minnan. The contents of total nitrogen and total potassium were 8.7443. 90% higher than that in the mixed forest. The results showed that the soil nutrient level of 14-year-old mixed forest of Minnan and Schima superba was higher than that of 14-year-old pure forest of Minnan, and the content of available elements in 4-year-old mixed stand of Chinese fir was higher than that of 4-year-old pure forest. The cultivation of mixed forest of Minnan and Schima superba can improve the soil fertility decline caused by the continuous planting of Chinese fir and provide the theoretical basis for the near natural management of the plantation of Minnan.
【作者单位】： 中南林业科技大学林学院;
【基金】：全国森林经营科技支撑科研专项(169201531-6)
【分类号】：S714.8
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本文编号：2226862