南仁湖位於墾丁國家公園東北部南仁山生態保護區內，是公告的國家重要濕地，但近年來卻因自然演替而陸化嚴重，墾丁國家公園於2020年於主湖西側進行刨除作業，今年亦於主湖東側增加刨除作業來抵制南仁湖陸化及優勢大型草本植物鋪地黍的生長。本研究透過長期監測吳首賢(2003)和陳依盈(2013)在2000和2012年所設立調查的樣區，了解長期植物豐量和多樣性的變化，以及主湖邊側刨除作業對濕地植物的影響。本年度2023年調查共記錄有47種水生植物，湖區水生植物的種類數和多樣性都比2012年增加，但卻比2022年減少。主湖西側和東側的刨除作業有利於排除陸生植物種類和小型濕地植物定殖，使得主湖西側水生植物種類數由2019年的12種增加到今年的20種，西側shanon植物多樣性達1.92，東側則為1.51，但西側與去年相比不論是物種數或多樣性指數都降低了，可見刨除的效果在第3年開始下降，而東側草澤刨除後水深今年平均水深接近40 cm，不論小型植物定殖，還需未來觀察。建議未來可持續觀察東側草澤變化，以及在西側草澤區局部小型的製造不同水深窪地，以保濕地植物生物多樣性。
計畫類別：[植物生態]
英文計劃名稱：Inventory of Wetland Plant Diversity in Nanren Lake Region
英文摘要：Nanren Lake is located in Nanjenshan Ecological Reserve Area which is situated at the northeastern corner of Kentin National Park. Though Nanren Lake is claimed as a national important wetland, it is suspected to become gradually terrestrialized in recent years due to natural succession. An eradication of dominant macrophyte was done at the southwestern side of lake marsh in May 2020. Our study is to monitor the wetland vegetation species composition in long term and to compare with the plant inventory before to understand the dynamic of vegetation succession. We resurveyed the plots established in 2000 by Shou-Hsien Wu (2003) and compared the results with him and I-Ying Chen (2013) to understand the change of species abundance and diversity. There are 47 water plant species recorded in this year. The species richness and diversity are increased than they in 2012, but not yet reach the numbers in 2000.
47 hydrophyte species were recorded in 2023. The species number and diversity of wetland plants were increased compared to year 2021, but lower than year 2022.
The number of wetland plant species of eradicated bank was increased and the terrestrial plants were weeded. The number of plant species of west eradicated bank was increased from 12 species in 2019 to 20 species in 2023. The shanon diversity index of eradicated bank is 1.92, and 1.51 in east eradicated bank. However the value were decreased in west eradicated bank compared to former year. It showed the power of eradication were deceased now. The effects of the eradication of east bank is not obvious this year. Our results suggest the small-scale disturbance is needed to maintain the west bank diversity and the changes of east bank need to monitor in the future.
計畫屬性：本處委託辦理
執行年度：112
計畫主持人：賴宜鈴
中文關鍵字：南仁湖國家級重要濕地、陸域化、刨除工作
英文關鍵字：Nanren Lake wetland, terrestrialization, eradication