酸紫泥田连续5年单施碱性物料提升土壤有机碳活性
Elevated soil organic carbon lability by continuous singly amending alkaline materials in an acidic purple paddy
何雨茹 1张丽娜 1盛浩 1李源钊 1满志勇 1肖华翠 1周萍2
作者信息
- 1. 湖南农业大学资源学院,湖南 长沙 410128
- 2. 中国科学院亚热带农业生态研究所,亚热带农业生态过程重点实验室,湖南 长沙 410125
- 折叠
摘要
碱性物料连续施用对土壤有机碳库活性的影响仍有较大不确定性.选取了湖南省东部双季稻传统产区典型的酸紫泥田,应用大田成对比较试验,研究了有机、无机碱性物料(商品有机肥、生石灰、硅钙镁土壤调理剂)连续单施 5 年后,0～15 cm表土活性有机碳组分含量、胞外酶活性及其与土壤养分的关系.与对照相比,连续单施碱性物料处理,土壤粗颗粒有机碳(cPOC)、细颗粒有机碳(fPOC)和轻组有机碳(LFOC)含量分别提高57%～136%、27%～77%和 51%～60%,也提高了土壤活性有机碳组分占总有机碳的比例(P＜0.05).连续单施石灰、土壤调理剂,土壤中较稳定的钙键合态有机碳含量分别显著提高22%和 34%,但连续单施有机肥,土壤β-葡萄糖苷酶(βG)、N-乙酰-β-D-氨基葡萄糖苷酶(NAG)活性均显著降低约20%.土壤活性有机碳含量与总有机碳、速效养分含量显著相关.碱性物料连年施用提高了酸性水稻土有机碳水平和活性,有利于土壤碳吸存.水稻土POC和LFOC组分含量对碱性物料投入的响应敏感,可有效地指示水稻土有机碳库的早期变化.
Abstract
The impact of continuous amending of alkaline materials on soil organic carbon(C)lability remains unknown.The typical acidic purple paddy of double-cropped rice in eastern Hunan province was selected.A paired field experiment was applied to study the labile organic C fractions and extracellular enzyme activities in topsoil at 0-15 cm depth in response to 5 years continuous singly amending alkaline commercial organic fertilizer,quicklime,and Si-Ca-Mg soil conditioner.Comparing to the CK,the content of coarse particulate organic C(cPOC),fine particulate organic C(fPOC),and light fraction organic C(LFOC)in soil increased by 57%-136%,27%-77%and 51%-60%(P＜0.05),respectively,after continuous amending alkaline materials.The ratios of soil labile organic C fractions to total organic C were increased.The content of Ca-SOC raised by 22%and 34%,respectively,after continuous amending lime and soil conditioner.The enzyme activities of β-glucosidase(βG)and N-acetyl-β-D-glucosaminidase(NAG)in soil were significantly reduced by 20%after continuous amending organic fertilizer.The soil labile organic C fractions contents were significantly correlated with soil organic C and available nutrient contents.Continuous input of alkaline materials in paddy enhanced the soil organic C level and lability,which was beneficial to soil C sequestration.The POC and LFOC fractions in soil were sensitive to the alkaline materials input,which could effectively indicate the early change in paddy soil organic C.
关键词
活性有机碳组分/胞外酶/土壤改良/碱性物料/水稻土Key words
soil labile organic C/extracellular enzyme/soil improvement/alkaline materials/paddy soil引用本文复制引用
基金项目
科技基础资源调查专项课题(2021FY100504)
国家重点研发计划部省联动项目课题(2022YFD1700103-306)
2023年湖南农业大学研究生科研创新项目(2023XC115)
出版年
2024
NETL
NSTL
万方数据