Keanekaragaman Vegetasi Riparian Sungai Polimaan, Minahasa Selatan – Sulawesi Utara (Riparian Vegetation Diversity of Polimaan River, South Minahasa- Sulawesi Utara)

Abstrak Degradasi riparian akibat aktivitas manusia dapat menyebabkan penurunan vegetasi riparian yang akan berdampak pada fungsi dalam mempertahankan kualitas air sungai, habitat hidupan liar dan menurunkan jasanya bagi kesejahteraan manusia. Penelitian vegetasi riparian Sungai Polimaan dilakukan untuk menganalisis keanekaragaman vegetasi riparian Sungai Polimaan. Penelitian dilakukan dari Desember 2016 sampai Maret 2017 di sepanjang sungai dari hulu, tengah hingga hilir Sungai Polimaan. Metode analisis vegetasi transek petak sistematik dilakukan pada tingkat rumput, semai, pancang, tihang dan pohon. Vegetasi riparian yang ditemukan di Sungai Polimaan sebanyak 665 individu, 68 spesies, 41 suku. Keanekaragaman vegetasi riparian (H’) secara keseluruhan tergolong sedang untuk tingkat rumput (1,55), pancang (1,53), tihang (1,64) dan pohon (1,76) dan tergolong tinggi pada tingkat semai (3,59). Upaya pengelolaan zona riparian diperlukan untuk mempertahankan keanekaragaman vegetasi riparian di Sungai Polimaan. Kata kunci: keanekaragaman, Sungai Polimaan, vegetasi riparian. Abstract Riparian degradation due to human activities can lead to decreased riparian vegetation that affects riparian function to maintain river quality, wildlife habitat and riparian services for human well-being. The riparian vegetation research of the Polimaan River was conducted to analyze the diversity of riparian vegetation of the Polimaan River. The study was conducted from December 2016 to March 2017 along river from upper, middle to down the Polimaan River. Method of systematic transect vegetation analysis was carried out at the levels of grass, seedling, stake, banana and tree. The riparian vegetation found in the Polimaan River consisted of 665 individuals, 68 species, 41 families. Riparian vegetation diversity (H ') could be classified into middle diversity for grass (1.55), sapling (1.53), poles (1.64) as well as tree (1.76), and high diversity for seedlings (3.59). Riparian zone management are required to preserve the diversity of riparian vegetation of Polimaan River.Key words: biodiversity, Polimaan River, riparian vegetation

Deciduous or evergreen: Does it make a difference to understorey pasture yield and riparian zone management?

This paper uses data from an artificial shade trial to compare the impacts of shade duration on pasture production with deciduous and evergreen tree species. Results indicated that light quantity was not the only main limiting factor in understorey pasture yield. At low levels of shade (