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Sanyang Wetland makes headway in preserving biodiversity
Date:2023-10-30 14:57:20 Source:Wenzhou·China Fonts:[ Large Medium Small ]

“Ecological Bird Island” in Sanyang Wetland

When embarking on a visit to the Sanyang Wetland, one finds not only the ever-changing beauty of the four seasons but also the opportunity to pause, bask in the scenery, and listen intently to the symphony of avian melodies and insect serenades within. In particular, in the small wetland, Insect Hostel, and Ecological Bird Island, both city-dwellers and avid travelers have the privilege to relish the distinctive natural vistas of the wetland and partake in the heartwarming hours of harmonious coexistence with its diverse denizens.

Small wetland: a tiny marvel with a mighty ecological role

Upon entering the northern gateway of Sanyang Wetland and strolling along the Nanxian Dike for a brief distance, one encounters a verdant expanse covering approximately 20,000m2, known as a “small wetland”. While it may be diminutive in size, the small wetland boasts substantial ecological importance.

In terms of topography, the small wetland fully considers the supply of nutrients for plant growth and the diversity of surface habitats. Within the slightly larger pond bases, a modest number of fallen trees and stone blocks have been arranged to provide shelter for fish, aquatic insects, and various other organisms. This design, rooted in the diversity of soil substrates and environmental conditions, underpins the foundational structure of the small wetland ecosystem. Additionally, the creation of shallow ponds, depressions, and bio-ditches further enriches the small wetland’s topography, amplifying its ecological benefits.

According to the wetland staff, despite its modest scale, the small wetland serves as a “miniature rendition” of the greater Sanyang Wetland, playing a pivotal role in bolstering the ecological diversity of the entire wetland ecosystem. Notably, it extends a gracious refuge to the resident fauna, serving as a “stepping stone” for the migratory journey of wetland creatures. Furthermore, it sustains the surrounding food web and purifies the water. The wetland staff also pointed out that “The array of organisms within this small wetland continues to burgeon, enhancing the overall stability of the wetland’s ecosystem”.

Insect Hostel: a sanctuary for wetland’s insects

To provide home for the wetland’s insect denizens, the dedicated wetland staff have erected an “Insect Hostel” within the confines of the small wetland. Presently, this miniature hostel has welcomed a considerable number of insect guests into their newfound lodgings.

It is learned that the inception of the insect hostel aims to safeguard the wetland’s biodiversity. This innovative structure capitalizes on the principles of multi-layer, multi-structure, multi-unit, and abundant porosity. Discarded materials are ingeniously repurposed to create three-dimensional tower-like habitat structures, with various plant species strategically planted at different levels and within different units to construct a multidimensional plant space. Wetland staff fill this composite three-dimensional space with discarded wooden blocks, bamboo sticks, bricks, tiles, and other materials, thus forming a porous, multi-level structure.

Regular guests at this “Insect Hostel” include bees, wasps, beetles, and a plethora of other insect species. The hostel not only shelters the insects from the elements, but also serves as a secure location for these creatures to propagate their progeny. A reminder to our esteemed citizens and visitors: should you wish to pay a visit to the “Insect Hostel”, please be kind and take care not to disturb the tiny residents within.

Ecological Bird Island: a joyful retreat for wetland avifauna

Bird Island stands as a vital congregation site for waterfowl within the expanse of the Sanyang Wetland. Unbeknownst to many, Sanyang Wetland is a significant habitat, winter haven, and migratory rest stop for a multitude of waterfowl. In each autumn and winter, a grand spectacle unfolds as large flocks of birds migrate here to pass the winter.

In recent years, thanks to the sustained environmental enhancement, the ancient trees that populate Sanyang Wetland have evolved into an idyllic haven for the birds, leading to a continued increase in the diversity of waterbird species dwelling within the wetland. As per the latest surveys, there are currently 142 bird species thriving within this ecosystem, including mandarin ducks, herons, swans, egrets, and cuckoos. Among these, 14 species hold the distinction of being nationally recognized as second-level key protected birds, such as the crested goshawk, black-winged kite, and kestrel.

These birds play a great role in the preservation of Sanyang Wetland’s ecological environment. In order to provide the birds with an undisturbed habitat, the Wenzhou Eco-park Management Committee has allotted ample living space for these avian residents within the wetland. Additionally, to spare the birds from the disturbance of tourists, the Committee has undertaken the transformation of several ecological bird islands in the northwestern section of the wetland.

Statistical data reveals a continuous positive trend in biodiversity within the Sanyang Wetland over the past five years. In comparison to data collected in 2003, the wetland now hosts 142 bird species and nearly 700 species of vascular plants. The Biodiversity Index (BI) has surged by 16 points compared to 2003, and the wetland’s average water depth has risen from 2.53 meters to 3 meters.