毛竹林土壤易氧化有机碳区域分异及影响因素  

Regional Differentiation and It’s Influencing Factors of Soil Easily-oxidized Organic Carbon in Subtropical Phyllostachys edulis Forests

作　　者：张翱 李文婷 王天祥 武耀星 雷刚 漆良华 Zhang Ao;Li Wenting;Wang Tianxiang;Wu Yaoxing;Lei Gang;Qi Lianghua(International Centre for Bamboo and Rattan Key Laboratory of National Forestry and Grassland Administration/Beijing for Bamboo&Rattan Science and Technology,Beijing 100102;Central South Inventory and Planning of Institute of National Forestry and Grassland Administration,Changsha 410007;Sanya Reseach Base of International Centre for Bamboo and Rattan,Sanya 572000)

机构地区：[1]国际竹藤中心国家林业和草原局/北京市共建竹藤科学与技术重点实验室,北京100102 [2]国家林业和草原局中南调查规划院,长沙410007 [3]国际竹藤中心三亚研究基地,三亚572000

出　　处：《林业科学》2024年第6期1-12,共12页Scientia Silvae Sinicae

基　　金：国际竹藤中心基本科研业务费平台配套项目(1632023014)。

摘　　要：【目的】在我国北、中和南亚热带研究毛竹林土壤易氧化有机碳的垂直分布规律和纬度分布格局,揭示其区域分异的主要影响因素,为毛竹林固碳增汇、经营管理和土壤有机碳库稳定性维持提供科学依据。【方法】通过实地调查和试验分析揭示亚热带不同区域毛竹林土壤易氧化有机碳含量沿土层和纬度的变化规律,运用地理探测器中因子探测、交互探测和风险探测分析土壤易氧化有机碳区域分异的影响因素。【结果】1)不同区域的毛竹林土壤易氧化有机碳含量均随土层加深而降低,但其占总有机碳的比例均随土层加深而升高;0~60 cm土层的易氧化有机碳含量表现为北亚热带(5.16 g·kg^(-1))>南亚热带(4.86 g·kg^(-1))>中亚热带(4.56 g·kg^(-1)),土壤碳库稳定性随纬度降低而降低。2)年均气温对毛竹林土壤易氧化有机碳含量变化的解释程度最高,q值为0.376~0.452;其次为海拔(q=0.392,P<0.001);林分因子中凋落物厚度对不同土层的易氧化有机碳含量影响显著,毛竹林生物量对30~60 cm土层的易氧化有机碳含量的影响较显著(q=0.308,P<0.01)。3)各因子间交互效应均表现为协同作用,毛竹林生物量与凋落物厚度交互作用在0~10 cm土层最强(q=0.704);毛竹林生物量与年均气温交互效应在10~30和30~60 cm土层最强,q值分别为0.601和0.732,均为较强的非线性增强作用。4)易氧化有机碳含量在部分年均气温范围之间存在显著差异,以年均气温17~19℃时最高(5.03~12.39 g·kg^(-1))、15~17℃时最低(2.69~6.20 g·kg^(-1));各土层易氧化有机碳含量在海拔700~900 m时均为最高;毛竹林生物量为75~90 t·hm^(-2)时,0~10 cm土层易氧化有机碳含量达最高。【结论】总体而言,毛竹林土壤易氧化有机碳含量均随土层加深而降低,其占总有机碳含量的比例呈现北亚热带<中亚热带<南亚热带的纬度分布格局,因而在低纬度地区应实施轻扰经营技术,【Objective】The vertical and latitudinal distribution of soil easily-oxidized organic carbon(EOC)in the north subtropical,middle subtropical,and south subtropical regions of Phyllostachys edulis forests were studied to reveal the main influencing factors of its regional differentiation,which provided scientific basis for carbon sequestration,management,and stability of soil organic carbon pool in P.edulis forests.【Method】Through field investigation and experimental analysis,the variation rules of soil easily-oxidized organic carbon content along soil layer and latitude was revealed.Factor detection,interaction detection and risk detection of geodetector were used to analyze the factors affecting the regional differentiation of soil easily-oxidized organic carbon.【Result】1)Soil easily-oxidized organic carbon content of P.edulis forests decreases with deepening of soil layers in each region,but its proportion to total soil organic carbon increased with the deepening of soil layer.Easily-oxidized organic carbon contents of 0−60 cm soil layer of northern subtropical P.edulis forests(5.16 g·kg^(-1))was higher than that in the middle(4.56 g·kg^(-1))and southern(4.86 g·kg^(-1))subtropics.The stability of soil carbon pool decreased with decreasing latitude.2)Mean annual temperature(MAT)was the most important factor in explaining soil easily-oxidized organic carbon of P.edulis forests,with q values ranging from 0.376 to 0.452,followed by elevation(q=0.392,P<0.001).Among the stand factors,the litter thickness had significant effects on soil easily-oxidized organic carbon in different soil layers,and stand biomass of P.edulis had a significant effect on easily-oxidized organic carbon for 30−60 cm soil layer.(q=0.308,P<0.01).3)The interaction effects between all factors were synergistic.The interaction between stand biomass and litter thickness for 0−10 cm layer was the strongest(q=0.704).The interaction between stand biomass and mean annual temperature was the strongest for 10−30 cm and 30−60 cm soil

关 键 词：易氧化有机碳 区域分异特征 影响因素 地理探测器 毛竹林 

分 类 号：S718.5[农业科学—林学]