生态学报2026，Vol.46Issue(8)：4301-4314,14.DOI:10.20103/j.stxb.202507251941
拧条平茬方式对荒漠草原凋落物碳及结构性碳降解的影响
Effects of Caragana liouana stumping ways on litter carbon and structural carbon degradation in desert steppe
摘要
Abstract
To investigate the effects of different stumping ways on carbon cycling mechanisms during litter decomposition,a field experiment was conducted in a Caragana liouana intercropped desert steppe in Yanchi County,Ningxia.Five treatments were established:no stumping(WP),one belt stumped with two belts not stumped(G2 P1),one belt stumped and one belt not stumped(G1 P1),two belts stumped and one belt not stumped(G1 P2),and complete stumping(QP).By combining litter decomposition experiments with the Olson exponential decay model,redundancy analysis(RDA),and random forest(RF)modeling,we systematically analyzed the functional group composition of litter,carbon characteristics,structural carbon dynamics,and their driving factors under different stumping regimes.The findings revealed that:1)The functional group composition of litter,chemical composition of carbon,and structural carbon content were significantly affected by the stumping ways.The QP treatment exhibited the fastest litter decomposition rate,while the G1 P2 treatment showed the most rapid carbon decomposition rate.2)Different stumping ways significantly influenced the release of structural carbon.After 345 days of decomposition,cellulose was degraded across all treatments except G1 P1 and it contributed substantially to litter decomposition.The G1 P2 treatment displayed the highest degradation rates and contributions for both hemicellulose and lignin.Additionally,an increase in the lignin-to-cellulose ratio was associated with a significant reduction in remaining litter mass.3)Redundancy analysis identified soil moisture content(SMC)and average plant species(APS)as key drivers of litter decomposition.The random forest model further indicated that vegetation factors had a greater influence on litter decomposition than soil physicochemical properties.In conclusion,the QP and G1 P2 treatments synergistically optimized the carbon release process,primarily by accelerating the overall litter decomposition rate and enhancing the degradation of carbon components,respectively.These approaches proved to be effective management strategies for regulating soil carbon cycling in desert steppe ecosystems.关键词
荒漠草原/拧条/平茬方式/凋落物分解/结构性碳Key words
desert steppe/Caragana liouana/stumping way/litter decomposition/structural carbon引用本文复制引用
王学琴,沈艳,候腾思,李燕,杨伊莎,马红彬,王国会..拧条平茬方式对荒漠草原凋落物碳及结构性碳降解的影响[J].生态学报,2026,46(8):4301-4314,14.基金项目
宁夏中央引导地方专项(2024FRD)05059 （2024FRD）
中央财政林业推广项目(2025) （2025）
国家自然科学基金项目(32371783,32301504) （32371783,32301504）
