河北平山片麻岩山区微地形表层土壤养分异质性分析

发布时间：2018-04-14 05:30

本文选题：片麻岩山区 + 微地形　；参考：《水土保持研究》2017年06期

【摘要】：以河北平山片麻岩山区7种微地形(坡顶、塌陷、巨石背阴、缓台、陡坎、谷坡、U形沟)及原状坡的表层土壤养分测定数据为基础,对比分析不同微地形及原状坡之间表层土壤养分的异质性,为片麻岩山区植被恢复提供科学依据。结果表明:(1)微地形、坡向、风化层厚度均影响了表层土壤养分的变化,而微地形是引起这种变化的主要因子。(2)微地形的表层土壤养分特征多数优于原状坡。其中,U形沟、塌陷和巨石背阴处有机质含量最大(68.94g/kg,60.71g/kg,62.77g/kg),显著高于其他微地形和原状坡,坡顶处最小(22.58g/kg)。(3)全氮与全磷含量规律基本一致,都在U形沟、塌陷和巨石背阴处最大,缓台和坡顶处较小。全钾含量在坡顶、陡坎、谷坡处最大(11.88g/kg,12.56g/kg,11.67g/kg),塌陷、巨石背阴处较小(9.39g/kg,9.69g/kg)。(4)碱解氮含量在U形沟、塌陷和巨石背阴处最大(6.87mg/kg,6.54mg/kg,5.93mg/kg),显著高于其他微地形及原状坡,坡顶处最小(3.75mg/kg)。U形沟处速效磷含量最大(3.55mg/kg),塌陷、巨石背阴、陡坎和谷坡次之,这5种微地形显著高于坡顶和原状坡,坡顶处最小(1.27mg/kg)。速效钾含量在坡顶、陡坎达到最大(60.09mg/kg,58.27mg/kg),这2种微地形显著高于其他微地形和原状坡。(5)通过对7种微地形和原状坡的3个坡向的表层土壤养分进行灰色关联分析,得出U形沟、塌陷和巨石背阴的土壤养分条件最好,坡顶和原状坡的土壤养分条件最差。
[Abstract]:Based on the surface soil nutrient determination data of 7 kinds of microtopography (top slope, collapse, boulder back shade, gentle platform, steep ridge, valley slope, U-shaped ditch) and undisturbed slope in Pingshan gneiss mountain area, Hebei Province, China.The heterogeneity of surface soil nutrients between different microtopography and undisturbed slopes was analyzed to provide scientific basis for vegetation restoration in gneiss mountain areas.The results showed that the microtopography, slope direction and the thickness of weathering layer all affected the nutrient changes of surface soil, while microtopography was the main factor causing the change. 2) the characteristics of nutrient in surface soil of microtopography were better than those of undisturbed slope.The content of organic matter in U-shaped trenches, collapses and boulders is 68.94 g / kg ~ (-1) kg / kg ~ (-1) 62.77 g / kg ~ (-1), which is significantly higher than that in other microtopography and undisturbed slopes. The minimum total nitrogen content is 22.58 g 路kg ~ (-1) 路kg ~ (3) at the top of the slope, which is the same as the total phosphorus content in the U-shaped trenches, collapses and boulders, and is the largest in the shade of U-shaped trenches, collapses and megoliths.The abutment and the top of the slope are smaller.The total potassium content at the top of the slope, at the steep ridge, at the slope is the largest at 11.88g / kg, 12.56g / kg / kg, 11.67g / kg / kg, collapse, boulder is 9.39g / kg / kg 9.69g / kg / kg 路kg ~ (4)) the content of N in the U-shaped trench, the maximum value of 6.87 mg / kg / kg ~ (6.54 mg / kg) of 6.54 mg / kg ~ (kg / kg) of boulder is 5.93 mg / kg ~ (kg / kg), which is significantly higher than that of other microtopography and the undisturbed slope.The maximum available phosphorus content was 3.55 mg 路kg ~ (-1) kg ~ (-1), collapse, boulder backshade, steep ridge and valley slope at the top of the slope, which were significantly higher than those of the top and the original slope, and the minimum value of 1.27 mg / kg ~ (-1) mg 路kg ~ (-1) ~ (-1) mg 路kg ~ (-1) ~ (-1) ~ (-1) mg 路kg ~ (-1) ~ (-1).The available potassium content reached the maximum of 60.09 mg / kg ~ 58.27 mg 路kg ~ (-1) 路kg ~ (-1) at the top of the slope. These two kinds of micro-topography were significantly higher than those of other micro-topography and undisturbed slope.The soil nutrient condition of collapse and boulder backshade is the best, and the soil nutrient condition of slope top and undisturbed slope is the worst.
【作者单位】：北京林业大学省部共建森林培育与保护教育部重点实验室;
【基金】：“十二五”国家科技支撑计划项目(2015BAD07B02)困难立地植被恢复技术研究与示范
【分类号】：S158

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