{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,29]],"date-time":"2025-10-29T09:48:49Z","timestamp":1761731329483,"version":"build-2065373602"},"reference-count":77,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2025,10,24]],"date-time":"2025-10-24T00:00:00Z","timestamp":1761264000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52268011"],"award-info":[{"award-number":["52268011"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJGI"],"abstract":"<jats:p>Street vitality has become a crucial metric for smart city management. Classical theories qualitatively explain that street vitality originates from the dynamic interaction between people and spatial carriers, yet the threshold effect within this process has not been addressed, leaving a gap in urban research. This study selects South China, one of China\u2019s most vibrant and globally influential regions, introduces dissipative structure theory based on classical theories, and constructs a threshold effect hypothesis model for the vitality formation mechanism. Through energy efficiency conversion of data and a slope-based method for identifying balanced time periods, the periods of supply\u2013demand balance in energy efficiency were identified, the threshold effect in vitality formation was captured, and critical thresholds were measured. The results indicate the following: (1) the hypothesis model is valid; (2) the threshold effect is inevitable and periodic, primarily occurring on workdays from 12:00 to 13:00 and 18:00 to 19:00, and on rest days from 08:00 to 09:00 and 18:00 to 19:00; and (3) the activation threshold is quantifiable and exhibits volatility, ranging from 0.40 to 1.56, varying specifically by city, season, day type, and street type. This study advances the translation of street vitality research from theory into practice and provides theoretical support and strategic guidance for smart city management globally, particularly in developing countries.<\/jats:p>","DOI":"10.3390\/ijgi14110417","type":"journal-article","created":{"date-parts":[[2025,10,29]],"date-time":"2025-10-29T02:23:28Z","timestamp":1761704608000},"page":"417","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["The Threshold Effect in the Street Vitality Formation Mechanism"],"prefix":"10.3390","volume":"14","author":[{"given":"Yilin","family":"Ke","sequence":"first","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiawen","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shiping","family":"Lin","sequence":"additional","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-7684-5810","authenticated-orcid":false,"given":"Jilong","family":"Li","sequence":"additional","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Niuniu","family":"Kong","sequence":"additional","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jie","family":"Zeng","sequence":"additional","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiacheng","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ke","family":"Ai","sequence":"additional","affiliation":[{"name":"College of Tropical Agriculture and Forestry, Hainan University, Haikou 570208, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2025,10,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"103724","DOI":"10.1016\/j.scs.2022.103724","article-title":"Street Vitality and Built Environment Features: A Data-Informed Approach from Fourteen Chinese Cities","volume":"79","author":"Jiang","year":"2022","journal-title":"Sustain. 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