摘要
为探究不同林龄秃杉人工林的土壤碳氮磷储量水平及团聚体组成特征,以高黎贡山周边沙坝林场关坡管护区为研究对象,通过野外调查和室内分析相结合的方法,测定不同林龄(4、12、24、30、40 a)秃杉人工林的土壤不同土层的碳、氮与磷储量,分析其团聚体组成及其相关性。结果显示:(1)秃杉人工林的土壤碳、氮、磷储量随着林龄的增长总体呈现出先升高后降低再上升的趋势。土壤有机碳和全氮储量在近熟林中显著高于幼龄林,各龄组土壤全磷储量存在显著差异。(2)秃杉人工林的林龄、土层深度对土壤水稳性团聚体粒径分布均有显著影响。(3)林龄、土层及其交互作用对土壤水稳性团聚体平均重量直径(MWD)有显著影响,其总体变化趋势表现为:40 a>30 a>4 a>24 a>12 a,其中4 a和30 a生秃杉人工林的MWD无显著差异,随林龄的增加,MWD呈现先减小后增大的趋势,在40 a达到最大值。相比于其他林龄,30~40 a林龄阶段的秃杉人工林具有更稳定的土壤团聚体结构和更高的土壤碳氮磷含量和储量,是秃杉人工林土壤地力维持和可持续经营管理的关键林龄阶段。(4)Pearson相关性分析发现:MWD与土壤全磷储量呈显著正相关(P<0.05),同时与>5 mm粒径的团聚体含量、0.25~0.50 mm粒径团聚体含量呈极显著正相关、极显著负相关(P<0.01)。研究结果表明:高黎贡山周边社区秃杉人工林土壤磷含量和土壤>5 mm、0.25~0.50 mm的粒径团聚体含量均是影响土壤团聚体稳定性的重要因素。
In order to investigate the soil carbon,nitrogen and phosphorus storage and the aggregate composition characteristics of Taiwania flousiana plantations of different stand ages,we employed a combination of field investigation and indoor analysis.The study was conducted at the Shaba Forest Farm Guanpo Management Station around the Gaoligong Mountains,where we analyzed the soil carbon,nitrogen,and phosphorus storage and aggregate composition in different soil layers of T.flousiana plantations of different ages(4,12,24,30 and 40 years).The results showed that:(1)With the increase of stand age,the storage of carbon,nitrogen,and phosphorus all showed a trend of first increasing,then decreasing,and then increasing again.The reserves of soil organic carbon and total nitrogen were significantly higher in near-mature forests than in young forests,and the reserves of soil total phosphorus varied among all age groups.(2)Stand age and soil depth had a significant effect on the particle size distribution of soil water-stable aggregates.(3)Stand age,soil layer and their interaction had a significant effect on the mean weight diameter(MWD)of soil water-stable aggregates.The overall trend was 40 years>30 years>4 years>24 years>12 years,with no significant difference between the 4-year and 30-year-old stands.With the increase of stand age,the MWD showed a trend of first decreasing and then increasing,reaching its maximum at 40 years.Compared with other stand ages,the T.flousiana plantations at the age stage of 30-40 years had a more stable soil structure,which is beneficial for the sustainable management of T.flousiana plantations.(4)Pearson correlation analysis showed that MWD was significantly positively correlated with soil total phosphorus(P<0.05),and was extremely significantly positively correlated with the content of aggregates with a particle size>5 mm(P<0.01),and was extremely significantly negatively correlated with the content of aggregates with a particle size of 0.25-0.5 mm(P<0.01).Therefore,it can be known that the content of phosphorus in the soil of T.flousiana plantations in the surrounding communities of the Gaoligong Mountains and the content of soil aggregates with a particle size>5 mm and 0.25-0.5 mm are important factors affecting the stability of soil aggregates.
作者
和丽萍
柴勇
段丽萍
张军邦
黄艳芬
王建琳
李贵祥
HE Liping;CHAI Yong;DUAN Liping;ZHANG Junbang;HUANG Yanfen;WANG Jianlin;LI Guixiang(Yunnan Academy of Forestry and Grassland,Kunming Yunnan 650201,P.R.China;Yunnan Key Laboratory of Biodiversity of Gaoligong Mountain,Yunnan Academy of Forestry and Grassland,Kunming Yunnan 650201,P.R.China;Gaoligong Mountain Forest Ecosystem Observation and Research Station of Yunnan Province,Yunnan Academy of Forestry and Grassland,Baoshan Yunnan 678025,P.R.China;Shaba State Forest Farm of Tengchong,Tengchong Yunnan 679100,P.R.China;Forestry and Grassland Bureau of Tengchong,Tengchong Yunnan 679100,P.R.China)
出处
《西部林业科学》
北大核心
2025年第6期39-46,共8页
Journal of West China Forestry Science
基金
国家重点研发计划项目“高黎贡山生态功能提升与入侵植物物种防控技术”(2022YFF1302400)
云南省科技重点研发计划项目“高黎贡山生态功能提升及可持续发展技术研究与示范”(202303AC100012)
云南省退化森林生态修复创新团队(202505AS350020)。
关键词
土壤团聚体
碳氮磷储量
林龄
秃杉人工林
高黎贡山
soil aggregates
carbon,nitrogen and phosphorus storage
stand age
Taiwania flousiana plantations
Gaoligong Mountains
