Seed Quality of Larix sibirica Ledeb. Depending on the Distance between Forest Areas and Pollution Sources around Ulaanbaatar City of Mongolia

Abstract

Seed quality and seed germination are the major indicators determining the success of regeneration and structure in natural forest ecosystems. This study focuses on problems associated with seed quality and seed germination under air pollution impacts in the surrounding forest ecosystems of Ulaanbaatar city of Mongolia. The objectives were to test whether there was any negative effect of air pollutants on the site index, and to analyze the relationship between seed quality and distance from the city center (maximum pollution). The study was carried out in natural larch forests (Larix sibirica Ledeb.) growing in the vicinity of the capital of Mongolia. A total of eight 100×100 m (1 ha) sample plots were laid out using completely randomized sampling design along the main wind direction. Remoteness from the city center was 10, 15, 20 and 30 km both to the north and to the south. Results showed a high variation in stand mean height (p > 0.001) and diameter (p > 0.001) among selected forest areas. In general, all sampled forests belonged to bonitet / quality classes III, IV and V, which are considered as relatively poor growing conditions in terms of site index. Therefore, greater site index and seed quality were observed in the most distant locations from the city center, and contrary, the poorest seed quality was detected in locations close to the city center. This emphasizes that forests growing close to pollution sources exist with a potential risk of degradation, and their reproductive organs are more sensitive to the effects of pollutants.

state of the khandgait’s forest

“…Хөрсний шинж чанарын үзүүлэлтийг ШУА-ийн Газарзүй, геоэкологийн хүрээлэнгийн хөрсний лабораторид арга зүйн дагуу тодорхойлов. [14]. Энэ нь бидний судалгааны ялгаатай үр дүнг тайлбарлаж байна.…”

Conjugate Variability of Signs of the Female Generative System of Scots Pine (Pinus sylvestris L.) in the Conditions of Magnesite Pollution

“…The influence of external factors, including aerotechnogenic pollution, can lead to a change in these relationships. The effect of aeropollutants on the reproductive system can lead to a change in the structure of the connections of the whole complex of its features (Mamaev, 1973;Anikeev et al, 2000;Mahneva et al, 2003;Tihonova, 2005;Udval et al, 2020).…”