不同类型人工林下土壤斥水性的变化  

Variation characteristics of soil water repellency under different types of artificial forests

作　　者：彭家顺 雷开敏 兰龙焱 牛德奎[1] 郭晓敏[1] 刘晓君 PENG Jiashun;LEI Kaimin;LAN Longyan;NIU Dekui;GUO Xiaomin;LIU Xiaojun(Jiangxi Provincial Key Laboratory of Silviculture,Jiangxi Agricultural University,Nanchang 330045,Jiangxi,China)

机构地区：[1]江西农业大学江西省森林培育重点实验室,江西南昌330045

出　　处：《中南林业科技大学学报》2022年第3期136-142,共7页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(31760233)。

摘　　要：【目的】土壤斥水性是普遍存在的,通过研究不同类型人工林下的土壤,探究土壤斥水性的变化规律以及影响因素,为人工林的栽培提供理论依据。【方法】选择栽培时间为10年的竹阔混交林、乔灌混交林和针阔混交林,并将草地作为对照组,利用滴水穿透时间法测定各混交林以及草地的土壤斥水性。比较不同类型人工林以及草地下的土壤之间的差异,并分析土壤斥水性与土壤理化性质以及林分特征之间的关系。【结果】研究结果表明除了针阔混交林下的土壤,各个样地内不同土层土壤的WDPT值随着土壤含水率的增加都具有一个显著峰值,草地、竹阔混交林、乔灌混交林的上层和下层土壤分别在含水率为200、210、190、120、170和140 g·kg^(-1)时达到峰值,草地和竹阔混交林上层和下层以及乔灌混交林的上层土壤表现出斥水性的含水率范围分别为70~220、180~220、120~200、90~140和160~180 g·kg^(-1)。土壤斥水性与土壤pH值、砂粒、粉粒、容重呈显著正相关关系,与有机质、黏粒、郁闭度、物种丰富度、土壤持水能力呈显著负相关关系。【结论】土壤斥水性与林分特征、土壤理化性质显著相关,林分结构越复杂,土壤级配越良好,持水能力越强,土壤斥水性越弱。随着土壤含水率的逐渐增大,斥水性的变化曲线呈单峰状。土壤的持水能力越强,表现出斥水性的含水率范围越小。【Objective】Soil water repellency is ubiquitous.By characterizing the soil under different types of artificial forests,this article explored the changing rules and influencing factors of soil water repellency,so as to provide a scientific theoretical basis for the cultivation of artificial forests.【Method】In this study,the bamboo-broadleaved mixed forest,arbor-shrub mixed forest and coniferous-broadleaved mixed forest with a cultivation time of 10 years were selected as the experimental subjects,and the grassland was used as the control.The water drop penetration time method was used to measure the soil water repellency of the mixed forests and grassland.The differences of the soil under different plantations and grasslands were compared,and the relationships between soil water repellency and soil physicochemical properties as well as stand characteristics were analyzed.【Result】The results showed that except for the soil under the coniferous and broadleaved mixed forest,the WDPT value of soil in different soil layers in each sample plot had a significant peak with the increase of soil water content.The soil moisture content of the upper and lower layers of grassland,bamboo-broadleaved mixed forest and arbor-shrub mixed forest reached the peak value when the water content was 200,210,190,120,170 and 140 g·kg^(-1) respectively.The water content of the upper and lower layers of grassland,bamboo-broadleaved mixed forest,and the upper layers of arbor-shrub mixed forest were 70-220,180-220,120-200,90-140 and 160-180 g·kg^(-1),respectively.Soil water repellency was positively correlated with soil pH value,grit,silt and bulk density,and negatively correlated with organic matter,clay,canopy density,species richness and soil water holding capacity.【Conclusion】Soil water repellency is significantly related to stand characteristics and soil physicochemical properties.The more complex the stand structure is,the better the soil gradation is,the stronger the water holding capacity is,and the weaker the soil wat

关 键 词：土壤斥水性 WDPT 人工林 土壤理化性质 

分 类 号：S714.7[农业科学—林学]