摘要
[目的]研究冷浸田改种泥炭藓(Sphagnum)不同年限后土壤的固碳潜力和胞外酶活性的变化,为合理利用冷浸田提供依据。[方法]选取贵州省黔南州独山县紫林山村为研究区,以种植水稻的冷浸田为对照,对比分析冷浸田改种泥炭藓1、3、10和20年后表层(0-10 cm)土壤理化性质、胞外酶活性及土壤有机碳含量变化,探究泥炭藓种植对冷浸田土壤固碳潜力的影响。[结果](1)种植泥炭藓改变了冷浸田土壤理化性质,种植10年后,土壤容重、团聚体平均重量直径及总酚含量相比对照分别提高了16.9%、33.8%和88.1%。(2)随着泥炭藓种植年限增加,土壤纤维素二糖水解酶、酸性磷酸酶、β-1,4-乙酰-葡萄糖胺糖苷酶、β-1,4-葡萄糖苷酶、亮氨酸氨基肽酶活性以及多酚氧化酶含量均显著降低。(3)冷浸田改种泥炭藓10年后,土壤总有机碳和惰性有机碳含量显著增加,而改种泥炭藓20年后,土壤可溶性有机碳和活性有机碳含量显著降低,土壤纤维素二糖水解酶、酸性磷酸酶、β-1,4-乙酰-葡萄糖胺糖苷酶、β-1,4-葡萄糖苷酶、亮氨酸氨基肽酶活性以及多酚氧化酶含量均显著降低。(4)结构方程模型显示,对于总有机碳和惰性有机碳,泥炭藓种植年限的直接正效应最大。对于可溶性有机碳和活性有机碳,胞外酶活性的直接影响最大。土壤理化性质普遍通过影响胞外酶活性对4种碳产生间接影响,泥炭藓种植年限则通过影响土壤理化性质对4种碳产生间接影响。[结论]种植泥炭藓改变了土壤环境,显著增加冷浸田土壤有机碳含量且降低土壤胞外酶活性,促进碳积累,且长期种植泥炭藓使碳积累更加明显。
[Objective]In southern China,cold waterlogged paddy fields cover an expansive area and hold considerable potential carbon sequestration and remittance.However,the low yield and modest income derived from rice cultivation in such paddy fields have led to a high rate of abandonment.This study investigated whether conversion of cold waterlogged paddy fields to Sphagnum cultivation,an economically important plant beneficial for carbon sequestration,significantly enhances soil carbon storage while improving the income of farmers.The overall aim of this study was to evaluate the impact of Sphagnum cultivation on the carbon sequestration potential of cold waterlogged paddy soils.[Method]Zilinshan Village,Dushan County,Qiannan Prefecture,Guizhou Province,was selected as the study site.The physicochemical properties,extracellular enzyme activities,and organic carbon content in the surface soil(0-10 cm depth)were analyzed after transformation of cold waterlogged paddy fields to Sphagnum cultivation for 1,3,10,and 20 years.Paddy fields growing rice were used as the control.[Result](1)The years of Sphagnum cultivation altered the physicochemical properties of cold waterlogged paddy soils.Especially after Sphagnum cultivation for 10 years,the soil bulk density,mean weight diameter of aggregates,and total phenol content were increased by 16.9%,33.8%,and 88.1%,respectively,compared with the control.(2)With an increase in years of Sphagnum cultivation,the activities of cellulose hydrolase,acid phosphatase,β-1,4-N-acetylglucosaminidase,β-1,4-glucosidase,leucine aminopeptidase,and polyphenol oxidase significantly decreased.(3)After Sphagnum cultivation for 10 years,soil organic carbon and recalcitrant organic carbon contents increased significantly,and the dissolved organic carbon and easily oxidizable carbon contents decreased significantly,the activities of cellulose hydrolase,acid phosphatase,β-1,4-N-acetylglucosaminidase,β-1,4-glucosidase,leucine aminopeptidase,and polyphenol oxidase significantly decreased after Sphagnum
作者
高娅菲
赵媛博
徐玲
孙嘉悦
夏煜轩
薛丹
武海雯
宁航
吴安驰
吴林
GAO YaFei;ZHAO YuanBo;XU Lin;SUN JiaYue;XIA YuXuan;XUE Dan;WU HaiWen;NING Hang;WU AnChi;WU Lin(Key Laboratory of Biological Resources Protection and Utilization of Hubei Province,Enshi 445000,Hubei;College of Forestry and Horticulture,Hubei Minzu University,Enshi 445000,Hubei;Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041;Institute of Ecological Conservation and Restoration,Chinese Academy of Forestry,Beijing 100091)
出处
《中国农业科学》
CAS
CSCD
北大核心
2024年第8期1533-1546,共14页
Scientia Agricultura Sinica
基金
国家自然科学基金(32260303)
中国林业科学研究院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2020ZC005)。
关键词
冷浸田
泥炭藓
人工种植
土壤酶活性
碳积累
cold waterlogged paddy fields
Sphagnum
artificial planting
soil enzyme activity
carbon accumulation
