衡阳紫色土丘陵坡地土壤活性有机碳及理化性状对不同植被恢复模式的响应  

Responses of soil active organic carbon and physicochemical characteristics to different vegetation restoration models in sloping land with purple soils in Hengyang

作　　者：杨宁[1] 杨盛海[2] 徐一斐[1] 刘慧娟 许凌云 杨满元[1] YANG Ning;YANG Shenghai;XU Yifei;LIU Huijuan;XU Lingyun;YANG Manyuan(College of Landscape Architecture,Hunan Environmental-Biological Polytechnic College,Hengyang 421005,China;Hunan Academy of Social Sciences(Development Research Center of Hunan Government of People’s Re-public),Institute for Economic Research,Changsha 410000,China)

机构地区：[1]湖南环境生物职业技术学院园林学院,湖南衡阳421005 [2]湖南省社会科学院(湖南省人民政府发展研究中心)经济研究所,湖南长沙410000

出　　处：《甘肃农业大学学报》2024年第6期203-209,217,共8页Journal of Gansu Agricultural University

基　　金：湖南省科技厅项目(S2006N332);衡阳市科技计划项目(202150083609);湖南环境生物职业技术学院南岳学者基金项目(N2021-03)。

摘　　要：【目的】明确衡阳紫色土丘陵坡地土壤活性有机碳及理化性状对不同植被恢复模式的响应,反映不同植被恢复模式对土壤肥力和土壤质量的恢复程度。【方法】对衡阳紫色土丘陵坡地不同植被恢复模式(天然草地、人工草地、灌草地、灌丛地和乔灌地)表层(0~10cm)与亚表层(10~20cm)土壤理化性质和土壤活性有机碳组分进行了测定。【结果】天然草地土壤pH显著高于其他植被恢复模式(P<0.05),天然草地与灌丛地土壤容重显著高于其他植被恢复模式(P<0.05),土壤有机碳、碱解氮、速效磷含量则以人工草地和灌草地显著高于其他植被恢复模式(P<0.05)。土壤微生物生物量碳含量表现为人工草地与灌草地显著高于其他植被恢复模式(P<0.05),而土壤易氧化有机碳含量、土壤微生物熵(qMB)和土壤有机碳活度大小均表现为人工草地与灌草地显著低于其他植被恢复模式(P<0.05)。土壤有机碳和碱解氮等是土壤活性有机碳组分的主要驱动因子,与其他土壤理化因子相互作用共同影响着土壤活性有机碳组分的变化。【结论】相对于其他植被恢复模式,人工草地(白花草木樨—猪屎豆)和灌草地(紫穗槐+白花草木樨)对提高土壤碳储量和土壤活性有机碳含量有积极作用,有利于土壤速效养分和土壤功能的快速恢复。【Objective】The objective of this study was to determine the responses of soil active organic carbon(SAOC)and soil physicochemical characteristics,elucidating the soil restoration in fertility and qual-ity under various vegetation restoration models.【Method】Soil physicochemical properties and the fractions of SAOC in the surface(0~10 cm)and subsurface(10~20 cm)layers were analyzed in five vegetation resto-ration models as follows:natural grassland(NG),tame grassland(TG),frutex and grassland(FG),frutex(FX),and arbor and frutex(AF)on sloping land with purple soils in Hengyang,South-central China.【Result】Our results showed that the soil pH in NG was significantly higher than in the other four vegeta-tion restoration models(P<0.05).Additionally,the soil bulk density in NG and FX was significantly higher than in the other three vegetation restoration models(P<0.05).The levels of soil organic carbon(SOC),alkali-hydrolyzable nitrogen(AN),and available phosphorus(AP)in TG and FG were higher compared to the other three vegetation restoration models(P<0.05).SMBC contents in TG and FG were significantly higher than in the other three restoration models(P<0.05).However,the SEOC contents,soil microbial en-tropy(qMB),and soil organic carbon activity in TG and FG were significantly lower than in the other three restoration models(P<0.05).SOC and AN were identified as the primary driving factors for the fractions of SAOC,with interactions with other soil physico-chemical factors having a collective impact on the changes in SAOC fractions.【Conclusion】The study indicated that TG(Melilotus albus—Crotalaria pal-lid)and FG(Amorpha fruticosa+Melilotus albus)were particularly effective in enhancing carbon density and SAOC content.This enhancement facilitated the recovery of available nutrients and soil function com-pared to other restoration models on sloping land with purple soils in Hengyang,South-central China.

关 键 词：植被恢复模式 土壤活性有机碳 土壤微生物生物量碳 土壤易氧化有机碳 土壤有机碳活度 紫色土 

分 类 号：S718.5[农业科学—林学]