以整體區域概念探討山坡地土地可利用限度分類之研究

Limitation Classification of Slopeland Utilization Based on Regional Concept

王兆文(Chao-Wen Wang) ； 鄒佩蓉(Pei-Rong Tsou) ； 沈哲緯(Che-Wei Shen) ； 姜燁秀(Yeh-Hsiu Chiang)

《中華水土保持學報》 51卷2期 (2020/06) Pp. 76-83

https://doi.org/10.29417/JCSWC.202006_51(2).0004

摘要

民國65年公布山坡地保育利用條例，以規範山坡地範疇。為有效管理山坡地農地資源狀況，乃訂定「山坡地土地可利用限度分類標準」，以地籍為單位進行平均坡度、土壤有效深度、土壤沖蝕程度及母岩性質等4項因子之量測，綜合查定結果區分為宜農牧地、宜林地及加強保育地。惟以地籍為單位進行查定作業，可能出現部份宜農牧地之土地，因坡度陡峭本應實施保育工作，卻仍作農耕行為之不合理現象，本研究嘗試以具有地形邊界之斜坡單元搭配三級坡以下範圍進行核密度作為分析之邊界，並以區域概念查定進行山坡地土地可利用限度之分級。完成區域概念查定之山坡地土地可利用限度分類圖後，探討現行查定與區域概念查定之差異性分析。結果顯示，斜坡單元搭配核密度分析可有效解決山坡地土地可利用限度分級過於破碎之現象，且嘉義縣市山坡地範圍內現行查定與區域概念查定之山坡地土地可利用限度分級進行差異分析，得知吻合度達約75%，再評估現行查定地籍在套疊區域概念查定成果不同閾值下地籍改判之筆數，做為機關未來實施區域概念查定分級之影響評估。

關鍵字

核密度 ； 斜坡單元 ； 區域概念

並列摘要

To strengthen slopeland conservation, the Classification Standard of Slopeland Utilization Limitations was promulgated in 1976. Based on average slope, soil depth, soil erosion degree, and parent rock, this standard classified slopelands into land suitable for agriculture and animal husbandry, land suitable for forestry purposes, and land subject to strengthened conservation on one single cadastre that leads to the fragmentary of Limitation Classification of Slopeland Utilization (LCSU) results. We aimed to establish a regional concept for the LCSU method, which combined the slope unit and KDE of flat land (average slope ＜ 30%). The results revealed that the proposed regional concept for the LCSU method avoided the LCSU fragmentation. Cadastres of slopeland in Chiayi County were in agreement with the regional concept for the LCSU with a fitness of ＞75%. An amending assessment was also conducted to adapt the regional concept for the LCSU under different thresholds.

並列關鍵字

Kernel Density ； Slope Unit ； Regional Concept