文献类型：期刊文献

中文题名：川西亚高山不同森林恢复方式对土壤团聚体稳定性的影响

英文题名：Effects of Different Forest Restoration Methods on Soil Aggregate Stability in the Subalpine of Western Sichuan

作者：巩闪闪[1,2] 刘顺[1,2] 许格希[1,2] 史作民[1,2,3]

第一作者：巩闪闪

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]四川米亚罗森林生态系统国家定位观测研究站,理县623100;[3]南京林业大学南方现代林业协同创新中心,南京210037

年份：2023

卷号：3

期号：4

起止页码：1-9

中文期刊名：陆地生态系统与保护学报

外文期刊名：Terrestrial Ecosystem and Conservation

基金：“十四五”国家重点研发计划项目(2021YFD2200405);中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022SY021,CAFYBB2021ZA002-2,CAFYBB2022SY024)。

语种：中文

中文关键词：土壤团聚体稳定性;森林土壤;恢复方式;亚高山

外文关键词：soil aggregate stability;forest soil;restoration methods;subalpine

分类号：S718.5

摘要：【目的】研究川西亚高山不同森林恢复方式对土壤团聚体稳定性的影响,为退化森林的适应性恢复和可持续经营提供科学依据。【方法】选取川西亚高山不同恢复方式下的3种森林类型,即岷江冷杉?红桦次生林(自然恢复,SF)、云杉阔叶混交林(人工种植后自然恢复,MF)和云杉人工林(人工恢复,PF),采用干筛法测定了6个粒级(>5、2~5、1~2、0.5~1、0.25~0.5和<0.25 mm)土壤团聚体的分布特征,计算平均重量直径(MWD)、几何平均直径(GMD)、大于0.25 mm团聚体含量(R>0.25)和土壤可蚀性因子(K)等团聚体稳定性参数,探究不同森林恢复方式对土壤团聚体稳定性的影响。【结果】研究发现,SF和MF的团聚体分布以>2 mm团聚体为优势粒级,而PF的团聚体在各粒级分布较均匀。不同恢复方式对土壤团聚体稳定性参数(MWD、R>0.25、K)影响差异显著(P<0.05),其中SF和MF的土壤MWD和R>0.25均高于PF,而土壤可蚀性因子K低于PF。不同恢复方式的土壤团聚体稳定性与土壤有机碳、全氮含量和碳氮比及细根周转率显著相关,且细根周转率能解释超30%的土壤团聚体稳定性变异,说明森林恢复方式对土壤团聚体稳定性的影响与土壤有机质的周转过程密切相关。【结论】主要受不同森林的细根周转差异对土壤有机碳输入的影响,自然恢复形成的混交林较人工种植的针叶纯林更有利于土壤团聚体的稳定。因此,在川西亚高山地区退化森林恢复中,宜采用自然恢复或营建混交林的方式,有利于土壤结构的稳定。
【Objective】The effects of different forest restoration methods on the stability of soil aggregate in subalpine area of western Sichuan were studied to provide scientific reference for adaptive restoration and sustainable management of degraded forests.【Methods】Three forest types,namely,the Abies fargesii var.faxoniana-Betula albosinensis secondary forest(natural restoration,SF),the Picea asperata broadleaved mixed forest(natural restoration after artificial planting,MF)and the P.asperata plantated forest(artificial restoration,PF)were selected under different restoration methods in the subalpine of western Sichuan.The effects of restoration methods on the stability of soil aggregate were evaluated through the aggregate stability parameters,i.e.,mean weight diameter(MWD),geometric mean diameter(GMD),>0.25 mm soil aggregate content(R>0.25)and soil erodibility factor(K),which were calculated based on the distribution characteristics of six soil particle sizes(>5,2~5,1~2,0.5~1,0.25~0.5 and<0.25 mm),obtaining with the dry-sieving procedure.【Results】The aggregate distributions of SF and MF were found to be dominated by>2 mm aggregates,while the aggregate distribution of PF was evenly among the soil particle sizes.Restoration methods had a significant effect on the soil aggregate stability parameters(MWD,R>0.25,K)(P<0.05).Soil MWD and R>0.25 were higher,but soil erodibility factor(K)was lower in SF and MF than in PF.The stability of soil aggregate was significantly correlated with soil organic carbon,total nitrogen,C/N ratio and fine root turnover rate.Fine root turnover rate could explain more than 30%of the variation of soil aggregate stability,indicating that the effects of forest restoration methods on soil aggregate stability were closely related to the turnover process of soil organic matter.【Conclusion】The mixed forest formed by natural restoration had higher soil aggregate stability than the artificial pure forest,mainly affecting by the turnover of fine roots on soil organic carbon input.Therefore,natural restoration or construction of mixed forests should be adopted from the perspective of stabilizing soil structure in restoration of degraded forests in the subalpine of western Sichuan.