摘要
为探索长汀红壤侵蚀区马尾松林水土流失的有效治理策略,以长汀县水土流失区分布较多的郁闭度0.8的马尾松林为研究对象,设置不间伐、间伐20%、间伐40%和间伐60%的样地,采用标准径流小区的方法,分析不同程度间伐对马尾松林水土流失的影响,揭示水土流失和降雨因子间的关系。结果表明:①马尾松林水土流失随间伐强度的增加呈先减小后增大的规律,间伐60%处理马尾松林水土流失最严重,而间伐40%水土流失量最小;②不同间伐强度马尾松林产流产沙量均随降雨等级提高而增加,暴雨和大暴雨条件下产流产沙增幅尤为显著;③影响马尾松林产流产沙量的主要降雨因子是降雨量,其次为降雨侵蚀力。综上,马尾松林郁闭度过大不利于水土流失防治,长汀红壤侵蚀区马尾松林间伐40%(郁闭度0.5~0.6)水土保持效果最好。
In order to explore the effective control strategies for soil erosion in the Pinus massoniana forest in the red soil erosion area of Changting County,it was selected as the research object the Pinus massoniana forest with a canopy closure of 0.8,which is mostly distributed in the soil erosion area of Changting County.The sample plots were set up with no thinning,20%thinning,40%thinning,and 60%thinning for the analysis of the impact of different degrees of thinning on the soil erosion of the Pinus massoniana forest so as to reveal the relationship between soil erosion and rainfall factors by the application of the standard runoff plot method.The results showed that:①The soil erosion of the Pinus massoniana forest decreased first and then increased with the increase of thinning intensity.The soil erosion of the Pinus massoniana forest with 60%thinning was the most serious,while the forest with 40%thinning had the smallest soil loss;②The runoff and sediment yield of Pinus massoniana forests with different thinning strengths increased with increase of rainfall degrees.Of which,under the conditions of the rainstorm and heavy rainstorm,the runoff and sediment yield increased more obviously;③Rainfall amount was the main rainfall factor which had impact on the runoff and sediment yield of Pinus massoniana forests,followed by the rainfall erosivity.In a word,the the Pinus massoniana forest with too large canopy closure will be unfavorable to the soil erosion control.The the Pinus massoniana forest with 40%thinning(the canopy closure of 0.5-0.6)in the red soil erosion area of Changting County has the best soil conservation effect.
作者
武欣怡
黄智军
朱晨璐
黄偲祺
侯晓龙
Wu Xinyi;Huang Zhijun;Zhu Chenlu;Huang Siqi;Hou Xiaolong(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China;Key Laboratory of State Forestry and Grassland Administration for Soil and Water Conservation in Red Soil Region of South China,Fuzhou 350002,China;Collaborative Innovation Center for Soil and Water Conservation in the Red Soil Region on Both Sides of the Taiwan Straits,Fuzhou 350002,China)
出处
《亚热带水土保持》
2021年第4期38-43,共6页
Subtropical Soil and Water Conservation
基金
福建省科技厅自然科学基金(2019I0007)
国家自然科学基金(31901298)
福建农林大学科技创新专项基金(CXZX2020143C,71202103D)。
关键词
自然降雨等级
间伐
马尾松林
水土流失规律
回归分析
natural rainfall degree
thinning
Pinus massoniana forest
soil erosion rule
regression analysis
