南方红壤丘陵区水土保持林对枯落物和土壤养分的影响  

Effects of Soil and Water Conservation Forest on Litter and Soil Nutrients in Red Hilly Region of Southern China

作　　者：曹智 文仕知[1] 何功秀[1] 周沁 及利 杨丽丽[1] CAO Zhi;WEN Shi-zhi;HE Gong-xiu;ZHOU Qin;JI Li;YANG Li-li(College of Forestry,Central South University of Forestry and Technology,Changsha 410001,Hunan,China)

机构地区：[1]中南林业科技大学林学院,湖南长沙410000

出　　处：《西北林学院学报》2024年第1期154-161,共8页Journal of Northwest Forestry University

基　　金：国家重点研发计划课题(2021YFD2201303-02);湖南省林业科技创新基金项目(XLKT202202)。

摘　　要：探究不同水土保持林土壤有机碳及土壤养分变化,为水土保持林的营造提供科学依据。以湖南省金洞林场15年生杉木-闽楠混交林、闽楠纯林、杉木纯林为研究对象,测定不同季节土壤有机碳、土壤及凋落物养分含量,分析不同林分组成和季节对土壤有机碳的影响。结果表明,林分组成和季节对土壤有机碳含量存在显著影响,土壤有机碳主要受全N、全P、可溶性有机碳、可溶性有机N的影响。不同林分下,土壤养分和凋落物养分存在显著差异,杉木-闽楠混交林土壤和凋落物养分显著高于杉木纯林、闽楠纯林,其土壤有机碳、全N、全P比杉木纯林高35.07%~52.63%,凋落物矿质元素含量比闽楠纯林高25.35%~45.16%。季节因子对土壤养分的影响高于凋落物养分,季节因子对凋落物矿质元素无显著影响。林分组成对土壤有机碳的影响主要通过改变土壤理化性质,特别是N素含量来影响土壤有机碳;季节因子对土壤有机碳的影响通过改变水热条件及凋落物分解速率,从而影响土壤有机碳的输入、输出。研究结果对南方红壤地区水土保持林的营造具有一定的参考意义。The objective of this study was to unravel the variations of the organic carbon and nutrients in the soils of different water conservation forests to provide a scientific basis for the establishment and management of soil and water conservation forests.Fifteen-year-old Cunninghamia lanceolata-Phoebe bournei mixed forest,pure P.bournei,and C.lanceolata forests in Jindong Forest Farm of Hunan Province were taken as the research objects.The soil organic carbon,soil and litter nutrient contents in different seasons were determined,and the effects of different planting patterns and seasons on soil organic carbon were analyzed.The results showed that both planting pattern and season had significant effects on soil organic carbon content.Soil organic carbon was mainly affected by total nitrogen,total phosphorus,soluble organic carbon and dissolved organic nitrogen.There were significant differences in soil nutrients and litter nutrients under different planting patterns.The soil and litter nutrients of mixed forest were significantly higher than those of pure forests,the soil organic carbon,total nitrogen and total phosphorus of the mixed forests were 35.07%to 52.63%higher than those of pure forests,and the content of mineral elements in litters were 25.35%to 45.16%higher.Season had a stronger influence on soil nutrients than litters,and no significant effect on litter mineral elements.Soil organic carbon was mainly affected by planting pattern vichanging the soil physical and chemical properties,especially nitrogen content.Season had an effect on soil organic carbon by changing hydrothermal conditions and litter decomposition rate,which affects the input and output of soil organic carbon.The study has reference values on the afforestation of soil and water conservation forests in red soil region of southern China.

关 键 词：水土保持林 混交林 闽楠 杉木 土壤有机碳 

分 类 号：S714.7[农业科学—林学]