生态学报2024，Vol.44Issue(7)：2919-2930,12.DOI:10.20103/j.stxb.202304280893
等高反坡阶措施下坡耕地球囊霉素相关土壤蛋白对土壤碳氮储量的贡献
Contribution of glomalin-related soil protein to soil carbon and nitrogen storage in sloping farmland under contour reverse-slope terrace measures
摘要
Abstract
In order to confirm the ecological restoration function of slope microtopographic modification measure—contour reverse-slope terrace(CRT)on sloping farmland,it is extremely critical to reveal the effects and mechanisms of CRT on the glomalin-related soil protein(GRSP)content and contribution to soil carbon and nitrogen storage.The total GRSP(T-GRSP),easily extractable GRSP(EE-GRSP),soil organic carbon(SOC),and total nitrogen(TN)contents were determined in the soil of two terrace positions(above and below the terrace)and three depths(0-10,5-15 and 15-30 cm)of CRT and the corresponding positions of unmodified(CK)sloping farmland.The contribution of GRSP to soil carbon and nitrogen storage under CRT was explored,and the relevant mechanism was revealed.The results showed that:(1)comparing with CK,the contents of T-GRSP,EE-GRSP,SOC,and TN in CRT significantly increased by 16.6%—189%,7.28%—102%,1%—68.3%,and 7.29%—79.7%,respectively(P＜0.05).In addition,the promotion of CRT on GRSP content in sloping farmland was generally better in the rainy season than that in the dry season,higher in the surface soil(0-5 cm)than that in the deep soil(5-15 cm),and better in the slope below the terrace than that above the terrace.(2)Comparing with CK,SOC and TN storage in CRT sloping farmland increased by 8.06%vs.13.5%and 7.01%vs.12.1%in the dry and rainy seasons,respectively.Comparing with CK,the contribution rate of T-GRSP to SOC and TN in CRT increased by 8.5%—141%and 2.58%—133%,meanwhile,the contribution rate of EE-GRSP to SOC and TN in CRT increased by 1.38%—82%and 5.25%—87.2%.Moreover,the enhancement of CRT on SOC and TN storage in the rainy season was better than that in the dry season,and the enhancement of CRT on the contribution rate of T-GRSP to SOC and TN in surface soil was stronger in the rainy season than that in the dry season,and stronger in the slope below the terrace than that above the terrace.(3)CRT measures greatly improved the positive correlations between T-GRSP and soil porosity,SOC,and TN comparing with CK,while the correlation coefficients(R2)increased from 0.17,0.26,and 0.29 to 0.51,0.66,and 0.64,respectively.The results indicated that CRT measures not only reduced the loss of SOC and TN in sloping farmland,but also improved the soil aeration and permeability by increasing the content of organic matter,thus increasing the secretion and accumulation of GRSP in sloping farmland.In addition,soil carbon and nitrogen retention and storage were promoted through increasing the contribution rate of GRSP to carbon and nitrogen by CRT measures.关键词
球囊霉素相关土壤蛋白(GRSP)/土壤有机碳/土壤全氮/等高反坡阶/坡耕地Key words
glomalin-related soil protein(GRSP)/soil organic carbon/total nitrogen/contour reverse-slope terrace/sloping farmland引用本文复制引用
徐其静,侯磊,汪丽,李奇奇,王克勤..等高反坡阶措施下坡耕地球囊霉素相关土壤蛋白对土壤碳氮储量的贡献[J].生态学报,2024,44(7):2919-2930,12.基金项目
云南省"十三五"重点研发专项课题(2018BB018) （2018BB018）
云南省教育厅科学研究基金项目资助(2023Y0710,2023Y0712) （2023Y0710,2023Y0712）
云南省科技厅农业联合面上项目(202301BD070001-031) （202301BD070001-031）
