不同密度华北落叶松林天然林土壤养分特征研究

发布时间：2018-03-16 23:13

本文选题：华北落叶松天然林　切入点：土壤养分特征　出处：《生态环境学报》2017年01期 　论文类型：期刊论文

【摘要】：采用样地调查和土壤采样分析方法,对五台山地区华北落叶松(Larix principis-rupprechtii)天然林土壤养分特征进行研究,探讨不同林分密度华北落叶松天然林土壤养分特征,旨在为华北落叶松天然林的可持续经营提供理论依据。结果表明,林下土壤总碳、铵态氮和速效钾含量在0~10、10~20、20~30 cm土层之间的差异显著,表现出明显的由上到下递减的趋势;土壤硝态氮和速效钾含量在土层之间的差异不显著,但土壤硝态氮含量也在一定程度上表现出土层之间由上到下递减的趋势;土壤速效磷含量在各土层之间的差异最不显著,但中层略高于表层和下层。在不同土层中,不同林分密度的土壤养分特征存在差异。在0~10、10~20、20~30 cm土层中,土壤总碳、硝态氮、铵态氮、速效钾含量在576~1 568 plant·hm~(-2)密度范围内都表现为随林分密度的增大而先增加后降低的总体变化趋势;速效磷含量则分别表现为:表层先增加后减少,中层缓慢减少,下层先减少后增加。林分密度对表层土壤养分影响最为明显,随着土壤深度加深,营养元素对林分密度的响应发生改变。当华北落叶松天然林林分密度为896~1 216 plant·hm~(-2)时,0~30 cm深度土壤的总碳、硝态氮、铵态氮、速效钾、速效磷保持在相对较高的水平,以土壤养分为评价指标,研究地区华北落叶松天然林适宜的保留密度为896~1 216 plant·hm~(-2)。
[Abstract]:The soil nutrient characteristics of Larix principis-rupprechtii (Larix principis-rupprechtii) natural forest in Wutai Mountain area were studied by means of sample investigation and soil sampling analysis. The aim of this study was to provide theoretical basis for sustainable management of natural larch forests in North China. The results showed that the contents of total carbon, ammonium nitrogen and available potassium in the soil under the forest were significantly different in the soil layer of 0 ~ 10 ~ 10 ~ 10 ~ 20 ~ 20 ~ 20 ~ 20 ~ 20 ~ 30 cm, showing an obvious downward trend from top to bottom. There was no significant difference between soil nitrate nitrogen and available potassium content in soil layer, but the soil nitrate nitrogen content also showed the trend of decreasing from top to bottom in some extent, and the difference of soil available phosphorus content among different soil layers was the least significant. But the middle layer was slightly higher than the surface layer and the lower layer. In different soil layers, the soil nutrient characteristics of different stand densities were different. In the 0 ~ (10) ~ (10) ~ (10) ~ (20) ~ (20) ~ (20) ~ (20) ~ (30) cm soil layer, soil total carbon, nitrate nitrogen, ammonium nitrogen, The available potassium content in the range of 576 ~ 1 568 plant 路hm ~ (-2) showed a general trend of increasing and then decreasing with the increase of stand density, and the available phosphorus content was increased first and then decreased in the middle layer, respectively, and decreased slowly in the middle layer, while in the surface layer, the content of available potassium increased at first and then decreased in the middle layer. The stand density had the most obvious effect on the nutrient of the topsoil, and with the deepening of the soil depth, The response of nutrient elements to stand density was changed. When the stand density of natural larch forest was 896 ~ 1 216 plant 路hm ~ (-2), the total carbon, nitrate nitrogen, ammonium nitrogen, available potassium and available phosphorus were kept at a relatively high level in the soil at a depth of 30 cm. Using soil nutrient as the evaluation index, the suitable reserve density of natural larch forest in the study area was 896 ~ 1 216 plant 路hm ~ (-1) plant 路hm ~ (-2).
【作者单位】：山西农业大学林学院;山西农业大学研究生院;
【基金】：国家林业公益性行业科研专项项目(201404417)
【分类号】：S714.8

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