油松天然林不同土壤层养分及其与地形因子的关系  

Relationship between nutrients in different soil layers andtopographic factorsof natural pine forest Pinus tabulaeformis Garr

作　　者：王慧[1] 梁文俊[1] 南宏伟[1] Wang Hui;Liang Wenjun;Nan Hongwei(College of Forestry, Shanxi Agricultural University, Taigu 030801,China)

机构地区：[1]山西农业大学林学院,山西太谷030801

出　　处：《山西农业大学学报（自然科学版）》2020年第2期120-128,共9页Journal of Shanxi Agricultural University(Natural Science Edition)

基　　金：国家自然科学基金面上项目(31470630);山西省高等学校科技创新项目资助(2019L0391)。

摘　　要：[目的]土壤养分状况是土壤健康和肥力的基本保证,而地形能够通过影响微环境太阳辐射和水肥的空间再分配,影响着土壤的发育程度和方向,对于两者的研究可以为了解适地适树和土地资源利用提供依据。[方法]本研究以华北半干旱地区典型暖温带典型林分油松纯林为研究对象,研究其林内腐殖质层和壤土层总碳(TC)、全氮(TN)和有效磷(AP)含量,并采用广义线性模型,分析地形单一因子及其交互作用对土壤养分状况的影响。[结果](1) 关帝山油松天然纯林腐殖质层及以下20 cm壤土层TC含量为(101.70±2.08) g·kg^-1,TN含量为(0.42±0.01) g·kg^-1,AP含量为(1.11±0.01) g·kg^-1,三者均随着土壤层次的加深呈现递减趋势,并且在不同土壤层间存在不同程度的差异;(2)关帝山油松天然纯林腐殖质层TC、TN和AP之间、0~10 cm壤土层TC和TN之间存在着不同程度的显著性正相关,腐殖质层与10~20 cm壤土层TC含量、腐殖质层与0~10 cm壤土层TN呈不同程度的显著性正相关(P<0.05),而不同土壤层之间AP含量均存在极显著性正相关(P<0.001);(3)油松林不同土壤层养分受海拔和坡位单一因子的影响较为显著,腐殖质层TC和不同壤土层AP含量随海拔的增加显著降低,下坡位腐殖质层TN含量显著高于中坡和上坡的趋势;(4) 海拔和坡位的交互效应对于腐殖质层TN及AP、0~10 cm壤土层TC及TN含量影响显著,总体来说,随着海拔和坡位的增加,养分含量呈减少趋势。[结论]本研究可为关帝山油松天然纯林可持续经营以及土壤资源的精确管理提供理论支撑。[Objective]Soil nutrient condition is important for soil health and fertility, and topography affects soil development through the spatial redistribution of microenvironment solar radiation, water and fertilizer. Therefore, the research on the effects of these two factors on the nutrient distribution in the soil could pave the way for fitting the site with suitable plant species and effectively utilizing land resource. [Methods] Soil samples were collected innatural pure forest of Pinus tabulaeformis Garr, and the contents of total carbon (TC), total nitrogen (TN) and available phosphorus (AP) in humus layer and loam layer were measured. Linear model was developed and used to study the influence of topographic factors and their interactions on soil nutrients. [Results](1) The contents of TC, TN, and AP in the humus layer and in 20cm deeper layer of natural pure forest in Guandi mountain were determined as 101.70±2.08 g·kg^-1,0.42±0.01 g·kg^-1, and 1.11±0.01 g·kg^-1, respectively, and they all showed a decreasing trend when the soil depth was increased. The contents of TC, TN and AP in humus layer were significantly different from those in loam layer;(2)There were significant positive correlations between the contents of TC, TN and AP in humus layer, and between TC and TN in 0~10 cm loam layer. A significant positive correlation was also observed on TC content between humus layer and the 10~20 cm loam layer, TN content between humus layer and the 0~10 cm loam layer, and AP content among different soil layers (P<0.001);(3)Nutrients in different soil layers were significantly affected by both altitude and slope position. The content of TC and AP in humus layer was decreased significantly with the increase of altitude, and TN content in humus layer in down slope position was significantly higher than that in middle slope and upper slope;(4) The reciprocal action of altitude and slope position had significant effects on the contents of TN and AP in humus layer, and contents of both TC and TN in 0~10 cm loam laye

关 键 词：油松天然纯林 不同土壤层 土壤养分 地形因子 

分 类 号：S750[农业科学—森林经理学]