长江中下游地区生态系统服务对景观占比的响应及其阈值  

Response of ecosystem services to landscape proportion and its threshold in the middle and lower reaches of the Yangtze River

作　　者：田昌园 张红丽 张艺[1] 李嘉宁 汪军红 查同刚[1] TIAN Changyuan;ZHANG Hongli;ZHANG Yi;LI Jianing;WANG Junhong;ZHA Tonggang(School of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China;Soil and Water Conservation Monitoring Center,Ministry of Water Resources,Beijing 100000,China;Huoshan Water and Soil Conservation Monitoring Station,Lu′an 237266,China)

机构地区：[1]北京林业大学水土保持学院,北京100083 [2]水利部水土保持监测中心,北京100000 [3]霍山县水土保持试验站,六安237266

出　　处：《生态学报》2024年第18期8150-8158,共9页Acta Ecologica Sinica

基　　金：国家重点研发计划项目(2022YFF1303)。

摘　　要：人类活动所导致的土地利用方式改变对区域生态系统服务有着显著影响,厘清区域内不同土地利用类型景观面积占比对生态系统服务的影响机制对区域景观调控与用地管理有着重要意义。以长江中下游地区为研究区,以二级流域为研究单元,基于InVEST模型、RULSE模型以及NPP数据,评估产水量(WY)、固碳量(CS)以及土壤保持(SC)3种生态系统服务的空间分布特征;使用分段线性回归探究生态系统服务综合指数(TES)对人类活动影响较为强烈的林地、建设用地和耕地面积占比的响应及其阈值。结果表明:(1)长江中下游地区林地占比较高地区分布在西部和南部,建设用地占比较高地区分布在东部和北部,耕地占比较高地区分布在东北部和中西部。(2)生态系统服务空间分布表现出明显的空间异质性,其中WY呈现出西南高,东北低的分布特征,CS呈现出南高北低的分布特征,SC高值区主要分布在植被覆盖率较高的山区,TES与SC分布呈现相似特征。(3)林地面积占比对TES有正向促进作用,其影响阈值为93.2%,当超过此阈值,促进作用会加强;建设用地和耕地面积占比对TES有着负向的作用,当面积占比分别超过8.7%和46.9%时,二者的负向作用会减弱,耕地在阈值前后的负向影响均弱于建设用地,因此,约束建设用地和耕地的开发,促进林地面积增加可以提升流域生态系统服务水平。研究结果可为长江中下游地区流域的景观调控和土地利用管理提供一定理论依据与参考。Land use change caused by human activities has a significant impact on regional ecosystem services.It is of great significance to clarify the impact mechanism of the proportion of landscape area of different land use types on ecosystem services for regional landscape regulation and land management.Here,taking the middle and lower reaches of the Yangtze River as the research area and the secondary watershed as the research unit,we evaluated the spatial distribution characteristics of water yield(WY),carbon sequestration(CS),and soil conservation(SC)of ecosystem services based on the InVEST model,the RULSE model and the NPP data.Then,piecewise linear regression was used to explore the response and threshold of total ecosystem services(TES)to the proportion of forest land,construction land and cultivated land that were strongly affected by human activities.The results displayed as follow:(1)The areas with high proportion of forest land in the middle and lower reaches of the Yangtze River are distributed in the west and south,the areas with high proportion of construction land are distributed in the east and north,and the areas with high proportion of cultivated land are distributed in the northeast and central and western regions.(2)The spatial distribution of ecosystem services showed obviously spatial heterogeneity.Among them,WY showed the distribution characteristics of high in the southwest and low in the northeast.CS showed the distribution characteristics of high in the south and low in the north.The high value area of SC is mainly distributed in mountainous areas with high vegetation coverage.The distribution of TES and SC showed similar characteristics.(3)The proportion of forest land area had a positive effect on TES,and its influence threshold was 93.2%.When the threshold is exceeded,the promotion effect will be strengthened.The proportion of construction land and cultivated land had a negative effect on TES.When the proportion of area exceeds 8.7%and 46.9%respectively,the negative effect of the two will b

关 键 词：生态系统服务 景观面积 阈值效应 长江中下游地区 

分 类 号：X171.1[环境科学与工程—环境科学]