北京林业大学学报2024，Vol.46Issue(12)：30-40,11.DOI:10.12171/j.1000-1522.20240188
晋西黄土区油松林土壤碳氮磷计量特征对林龄和密度的响应
Response of soil carbon,nitrogen and phosphorus stoichiometric characteristics of Pinus tabuliformis forests to stand age and density in the Loess Plateau region of western Shanxi Province,northern China
摘要
Abstract
[Objective]Analyzing the responses of soil carbon(C),nitrogen(N),and phosphorus(P)stoichiometry to stand age and density in Pinus tabuliformis forest land can provide scientific evidence for sustainable management of Pinus tabuliformis plantations.[Method]This study focused on Pinus tabuliformis plantations of three stand ages(30,40 and 50 years)and three densities(1 000-1 500 tree/ha,2 500-3 000 tree/ha,4 000-4 500 tree/ha)in the Caijiachuan Watershed,western Shanxi Province of northern China.Soil C,N,and P contents and their stoichiometric ratios were measured and analyzed from 0 to 100 cm depth layer.[Result]The two-factor interaction of stand age and density showed a significant influence on SOC,total N(TN),C∶N,C∶P,and N∶P(P<0.05).(2)Stand age had different effects on soil TN,SOC,and chemical stoichiometric ratios in stands of different densities,plantations with high density exhibited soil fertility decline at 50 years.Older plantations indicate that lower stand density is associated with higher soil nutrient levels.(3)Soil TN was significantly positively correlated with TP,SOC,C∶P,and N∶P(P<0.05);SOC was significantly positively correlated with C∶N,C∶P,and N∶P(P<0.01).C and N elements had a significant impact on soil chemical stoichiometry and stand growth(P<0.05).[Conclusion]In loess area,it is necessary to rationally adjust stand density according to different Pinus tabuliformis stand ages.For a 30-year-old stand,the recommended density was 4 000 tree/ha.The density should be reduced to 2 500-3 000 tree/ha at 40 years.For a 50-year-old stand,the optimal density range for soil nutrients was 1 000-1 500 tree/ha.The appropriate stand density can ensure that the soil nutrient status of the forest land is maintained at an optimal level,which is beneficial for the current sustainable management of the artificial forest and the continuous function of subsequent soil conservation.关键词
土壤化学计量特征/林龄/林分密度/油松人工林/晋西黄土区Key words
soil stoichiometric characteristics/stand age/stand density/Pinus tabuliformis plantation/loess area of western Shanxi Province分类
农业科技引用本文复制引用
杨周,张建军,赵炯昌,胡亚伟,李阳,王勃..晋西黄土区油松林土壤碳氮磷计量特征对林龄和密度的响应[J].北京林业大学学报,2024,46(12):30-40,11.基金项目
国家重点研发计划项目(2022YFF130040103). （2022YFF130040103）
