带状采伐初期对华西雨屏区杉木人工林土壤碳组分及稳定性的影响
Short-Term Effect of Strip Clear-Cutting on Soil Organic Carbon Fraction and Carbon Stability of Cunninghamia lanceolata Plantations in Rainy Area of Western China
吴章明 1唐思莹 2宋思宇 1李聪 1刘丽鸽 1朱鹏 1徐红伟 1张学强 3张健 1刘洋1
作者信息
- 1. 长江上游森林资源保育与生态安全国家林业和草原局重点实验室/长江上游林业生态工程四川省重点实验室/华西雨屏区人工林生态系统研究长期科研基地/四川农业大学林学院,成都 611130
- 2. 四川省林业和草原调查规划院,成都 610081
- 3. 洪雅县国有林场,四川 眉山 620360
- 折叠
摘要
[目的]旨在相同采伐强度下确定不同带宽采伐带和保留带对土壤碳组分及其稳定性的影响.[方法]在华西雨屏区洪雅林场人工林生态系统研究长期科研基地内,以集水区为功能单元,对23 a生的杉木人工林进行40%相同强度不同带宽的3种带状采伐处理,分别是S1(10 m采伐+15 m保留)、S2(20 m采伐+30 m保留)和S3(30 m采伐+45 m保留),在采伐1 a后进行土壤样品采集.[结果]①与未采伐杉木纯林相比,采伐带0～20 cm土层土壤有机碳含量均显著降低;②夏季0～40 cm土层的S2采伐带有机碳稳定性显著高于其他两个带宽,而S2保留带显著低于其他两个带宽;冬季表现为S1显著高于其他2个带宽;③冗余分析表明,微生物生物量碳与土壤有机碳各组分具有明显的协同作用;④土壤碳稳定性与可溶性有机碳含量呈显著正相关,与活性有机碳组分呈显著负相关.[结论]在40%采伐强度下,适宜选择S1带状采伐组合更有利于保持土壤有机碳含量和稳定性.研究结果为杉木人工林的近自然改造和指导林业碳汇经营提供了理论依据.
Abstract
[Objective]The aim of this study was to determine the effects of different widths of cutting strip and reserving strip with the same harvesting intensity on soil carbon fractions and their stability.[Method]In the Rainy Area of Western China Plantation Ecosystem Permanent Scientific Research Base,using the catchment area as a functional unit,a 23-years-old Cunninghamia lanceolata plantation forest was harvested with the same 40%intensity in different widths,i.e.,S1(10 m cutting+15 m reserv-ing),S2(20 m cutting+30 m reserving),S3(30 m cutting+45 m reserving),respectively.And we col-lected soil samples one year after logging.[Result]① Cutting strip treatments significantly deceased soil organic carbon content in 0-20 cm soil layer;② In summer,the soil organic carbon stability of S2 harvesting strip in 0-40 cm soil layer was significantly higher than that of the other two bandwidths,while the S2 retention strip was significantly lower than that of the other two bandwidths.In winter,S1 was significantly higher than the other two bandwidths;③ Redundancy analysis showed that microbial biomass carbon had significant synergies with soil organic carbon and carbon fractions;④ There was a significant positive correlation between soil carbon stability and soil dissolved organic carbon and a sig-nificant negative correlation with active organic carbon fractions.[Conclusion]Under the 40%logging intensity,choosing S3 strip clear-cutting is more conducive to maintaining soil organic carbon content and stability.The results of our study can provide theoretical basis for the near natural transformation of C.lanceolata and forestry carbon sink management.
关键词
杉木人工林/带状采伐/土壤有机碳/土壤碳稳定性Key words
Cunninghamia lanceolata plantations/strip clear-cutting/soil organic carbon/soil carbon stability引用本文复制引用
基金项目
国家自然科学基金(32371850)
国家自然科学基金(42307571)
出版年
2024
NETL
NSTL
万方数据