太行山南麓坡面土壤碳氮空间变异性及其影响因素

doi:10.13287/j.1001-9332.202108.029

摘要/Abstract

摘要： 太行山南麓是我国华北平原的重要生态屏障,研究该区域土壤养分的空间变异性对土石山区林业生态建设具有重要意义。本研究以太行山南麓典型坡面(人工林坡地和自然荒坡地)为对象,采用网格法布设采样点,运用经典统计学、地统计学和约束性排序相结合的方法对土壤养分的空间变异性进行分析。结果表明: 1)太行山南麓的土壤全碳(TC)含量为6.80～57.05 g·kg^-1,全氮(TN)含量为0.74～3.93 g·kg^-1;土壤TC、TN变异系数为25.0%～52.8%,均属于中等程度变异,该变异由随机性因素和结构性因素共同引起;养分的空间聚集性均随着滞后距的增加而下降。2)土壤养分含量从坡上到坡下均有增加的趋势,养分的高值区出现在坡下部分。3)土壤总容重、砾石含量、植被覆盖度、土壤含水量是影响太行山南麓土壤TC、TN空间变异的主要因素。4)土壤含水量是影响自然荒坡地土壤养分的主控因素,但不是影响人工林坡地的主控因素。

关键词: 太行山南麓, 土壤碳, 土壤氮, 空间变异性, 半方差分析, 冗余分析

Abstract: As an important ecological barrier for the North China Plain, research on the spatial variations of soil nutrients in the southern foot of the Taihang Mountains is of great significance for the forestry ecological construction in this rocky mountainous area. With the typical slopes (the artificial forestland and the natural wild slope) of the southern foot of the Taihang Mountains as the research objects, we used the grid method to arrange sampling points, and combined classical statistics, geostatistics and constrained sorting methods to analyze the spatial variations of soil nutrients. The results showed that: 1) soil total carbon (TC) contents were 6.80-57.05 g·kg^-1, and the total nitrogen (TN) contents were 0.74-3.93 g·kg^-1. The coefficients of variation of both soil TC and TN were 25.0%-52.8%, belonging to the moderate degree of variation, which were caused by the combination of random and structural factors. The spatial aggregation of soil nutrients decreased with increasing lag distances. 2) The contents of soil nutrients had increasing trends from the top to the bottom of the slopes, with high nutrient values appearing at the bottom of the slopes. 3) The soil bulk density, gravel content, vegetation coverage, and soil water content were the main factors affecting the spatial variability of soil TC and TN on the southern foot of the Taihang Mountains. 4) Soil water content was the main factor affecting soil nutrients at the natural wild slope, but not at the artificial forestland.

Key words: southern foot of Taihang Mountains, soil carbon, soil nitrogen, spatial variability, semi-variance analysis, redundancy analysis

张志华, 张锦豪, 桑玉强, 杨喜田, 王德彩, 郭加伟, 毕会涛. 太行山南麓坡面土壤碳氮空间变异性及其影响因素[J]. 应用生态学报, 2021, 32(8): 2829-2838.

ZHANG Zhi-hua, ZHANG Jin-hao, SANG Yu-qiang, YANG Xi-tian, WANG De-cai, GUO Jia-wei, BI Hui-tao. Spatial variations and its influencing factors of soil carbon and nitrogen on the southern foot of Taihang Mountains, China[J]. Chinese Journal of Applied Ecology, 2021, 32(8): 2829-2838.

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