【摘要】：為了研究不同林分類型閩楠人工林土壤氮、磷、鉀元素含量以及其隨土壤層次分布的變化規(guī)律。以湖南省金洞林場(chǎng)14年生閩楠-木荷混交林、14年生閩楠純林、杉木林下補(bǔ)植4年生閩楠-木荷混交林,4年生閩楠純林為研究對(duì)象,對(duì)4層深度(0~20、20~30、30~45、45~60 cm)土壤的氮、磷、鉀等養(yǎng)分實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比分析。結(jié)果如下:氮、全鉀元素含量在整個(gè)土層(0~60 cm)中、速效磷元素含量在20~60 cm土層中14年生閩楠—木荷混交林較14年生閩楠純林多28.15%、23.82%、11.49%,全磷及速效鉀元素含量14年生純林較混交林多65.97%、26.95%。林下補(bǔ)植4年生閩楠混交林林分土壤中表層和底層速效氮較4年生閩楠純林多21.31%、16.22%;磷及速效鉀元素含量在整個(gè)土層(0~60 cm)中較4年生閩楠純林多92.53%、16.11%,4年生閩楠純林土壤中全氮及全鉀含量較林下補(bǔ)植混交林多8.74%、23.90%。這些結(jié)果表明14年生閩楠—木荷混交林土壤養(yǎng)分水平較14年生閩楠純林高,杉木林下補(bǔ)植4年生閩楠混交林分土壤速效元素含量比4年生閩楠純林多,營造閩楠—木荷混交林可以改善由于杉木連載造成的地力衰退,為閩楠人工林近自然經(jīng)營提供理論依據(jù)。
[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.
【作者單位】： 中南林業(yè)科技大學(xué)林學(xué)院;
【基金】：全國森林經(jīng)營科技支撐科研專項(xiàng)(169201531-6)
【分類號(hào)】：S714.8
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本文編號(hào)：2226862