黄河三角洲盐碱地不同土地整治方案对农田景观及生态服务价值影响OA

The Yellow River Delta is a concentrated distribution area of coastal saline alkali land in China,with enormous potential for agricultural development but fragile ecological environment.Therefore,scien-tific improvement of saline alkali land and coordinated agricultural production and ecological protection are of great significance for implementing national strategies and ensuring regional ecological and food security.In this paper,taking Shengda ecological farm renovation project in Kenli district in Dongying city which is adjacent to the Yellow River Delta National Nature Reserve as an example,two differentiated saline alkali land renovation plans have been designed and evaluated.Plan 1 uses open ditch drainage and lays gravel road surface;while plan 2 adopts underground concealed pipe drainage and artificial hardened road surface.By using landscape pattern index analysis and ecosystem service value method,ecological impact of two schemes have been evaluated.It is showed that at the landscape pattern level,plan 1 adopts open ditch drainage method to form a network landscape pattern of farmland and ditch interlocking.The landscape di-versity index(SHDI=0.76)of plan 1 is higher than that of plan 2(SHDI=0.25).It is indicated that plan 1 is more conducive to regional biodiversity conservation.Plan 2 adopts underground concealed pipe laying,with a high maximum patch index(LPI=85.88%)for cultivated land.It is conducive to large-scale grain production.In terms of ecological service value,the total ecological value of plan 1(25.706×106 yuan)is higher than plan 2(14.506×106 yuan),and the advantages are mainly reflected in the regulation and cul-tural service functions,with significant contributions from the canal landscape.Sandstone pavement is more conducive to maintaining the natural attributes of the original landscape,reducing ecological interfer-ence,and has lower engineering costs compared to artificially hardened pavement.Both plans have in-creased arable land area and agricultural production capacity,but ecological analysis shows that Plan One has more advantages in collaborative production and ecology.This plan maintains biodiversity by construc-ting a"farmland ditch"pattern,and highlights its value in ecological services such as hydrological regula-tion,environmental purification,and landscape aesthetics,achieving sustainable management of agricul-tural production ecology in saline alkali land.