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。
【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】①Cutting strip treatments significantly deceased soil organic carbon content in 0-20 cm soil layer;②In 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;③Redundancy analysis showed that microbial biomass carbon had significant synergies with soil organic carbon and carbon fractions;④There 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.
作者
吴章明
唐思莹
宋思宇
李聪
刘丽鸽
朱鹏
徐红伟
张学强
张健
刘洋
WU Zhangming;TANG Siying;SONG Siyu;LI Cong;LIU Lige;ZHU Peng;XU Hongwei;ZHANG Xueqiang;ZHANG Jian;LIU Yang(Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province/College of Forestry,Sichuan Agricultural University,Chengdu 611130,China;Sichuan Forestry and Grassland Survey and Planning Institute,Chengdu 610081,China;Hongya County State Owned Forest Farm,Meishan 620360,Sichuan,China)
出处
《四川农业大学学报》
CSCD
北大核心
2024年第4期847-860,878,共15页
Journal of Sichuan Agricultural University
基金
国家自然科学基金(32371850、42307571)。
关键词
杉木人工林
带状采伐
土壤有机碳
土壤碳稳定性
Cunninghamia lanceolata plantations
strip clear-cutting
soil organic carbon
soil carbon stability
