休闲农业旅游背景下浙江省水改旱土壤有机碳的时空分异  

Spatiotemporal differentiation of organic carbon in upland soils converted from paddy field under the leisure agriculture tourism background in Zhejiang Province

作　　者：杨东伟 张建强[1] 黄学彬[1] 章明奎 YANG Dongwei;ZHANG Jianqiang;HUANG Xuebin;ZHANG Mingkui(Key Laboratory of Data Mining,Monitoring and Early Warning Technology for Island Tourism Resources,Ministry of Culture and Tourism,Hainan Tropical Ocean University,Sanya 572000,Hainan,China;College of Environment and Resources,Zhejiang University,Hangzhou 310058,Zhejiang,China;Business College,Guangxi University,Nanning 530004,Guangxi,China)

机构地区：[1]海南热带海洋学院海岛旅游资源数据挖掘与监测预警技术文化和旅游部重点实验室,海南三亚572000 [2]浙江大学环境与资源学院,浙江杭州310027 [3]广西大学商学院,广西南宁530004

出　　处：《浙江农林大学学报》2022年第6期1296-1302,共7页Journal of Zhejiang A&F University

基　　金：海南省哲学社会科学研究基地项目(JD21-34);海南省自然科学基金高层次人才项目(421RC591);三亚市哲学社会科学资助项目(SYSK 2021-07);海南热带海洋学院科研启动项目(RHDRC2020015);海南省教育厅教改项目(Hnjg2022-94);海南省自由贸易港邮轮游艇研究基地项目(HNCYRB2022);海南省国际海岛休闲度假旅游研究基地项目(HNITRB2022)。

摘　　要：【目的】研究休闲农业旅游背景下,浙江省由水田改种花卉、果树和苗圃的土壤有机碳(SOC)的时空分异,掌握利用方式改变后农田土壤固碳情况。【方法】选择浙江省水田及其改旱作后的土壤为研究对象,采用野外调查和室内分析方法,以“空间换时间”研究水田改旱作后1 m深土体内SOC密度和储量的时空变化,对比不同类型水田土壤改旱作后SOC变化的差异,估测浙江省水改旱土壤SOC储量变化。【结果】水田改旱作15~20 a后,潜育、铁渗、铁聚和简育等4类改旱系列土壤1 m深土体内,SOC分别下降了13.9%、34.9%、18.9%和23.9%,SOC密度损失量分别为2.06、2.92、1.14和1.54 t·hm^(-2)·a^(−1)。改旱后,SOC下降速率与地下水位下降深度呈极显著正相关(P<0.01)。【结论】水田是有利于SOC储存的土地利用方式,水田改旱作会降低SOC储存量,影响区域碳平衡。图3表4参16。[Objective] This paper, with an exploration of the spatiotemporal differentiation of soil organic carbon(SOC) in such upland as nurseries of flowers and trees as well as orchards, which have been converted from paddy field in Zhejiang Province under the background of leisure agriculture tourism, is aimed to better understand the carbon sequestration in soils after the land-use conversions. [Method] With soil samples selected from paddy field and the converted upland as the research objects, combined methods of field investigation and laboratory analysis were employed, on the basis of “trading space for time”, to investigate the spatiotemporal changes in the density and storage of SOC in 1 meter depth soil before a comparison was conducted of the differences of SOC among different types of upland converted from paddy fields and an estimation was made of the storage changes of SOC after the land-use conversions in Zhejiang Province.[Result] Soil organic carbon on four types of stagnic anthrosols(hap-stagnic, Fe-leachi-stagn, iFe-accumulistagnic and hapli-stagnic anthrosols) in 1 meter depth upland soils decreased by 13.9%, 34.9%, 18.9% and23.9% respectively after 15 to 20 years with the loss of SOC density being 2.06, 2.92, 1.14 and 1.54 t·hm^(-2)·a^(−1),respectively. There was a significant positive correlation(P<0.01) between the decline rate of SOC and the decline depth of groundwater level in the upland soils. [Conclusion] Paddy field is a better choice for the storage of SOC whereas the conversion from paddy field to upland decreases the storage of SOC and affects regional carbon balance. [Ch, 3 fig. 4 tab. 16 ref.]

关 键 词：休闲农业 水田 土地利用 土壤有机碳密度 碳汇 碳源 

分 类 号：S154[农业科学—土壤学]