Ecophysiological study of Siberian larch (Larix sibirica LDB) seedlings planted in the degraded areas of the green zone in Ulaanbaatar
DOI:
https://doi.org/10.5564/mjgg.v60i44.2922Keywords:
Green zone forest, reforestation, chlorophyll fluorescence, water potential of the stem, UlaanbaatarAbstract
Siberian larch (Larix sibirica Ldb.) occupies about 60% of the forest reserve area of Mongolia, and 55.6% (85,167 ha) of larch forests growing in the green zone forest reserve in the capital Ulaanbaatar. The larch forest in the green zone has the importance of directly affecting the environment and health and safety of the population living in the capital Ulaanbaatar. The study aimed to determine the ecophysiological status of seedlings planted in degraded areas after severe fire damage and logging. Afforestation was carried out in the spring of 2023, and the ecophysiological measurements of seedlings were conducted in July. Profit was determined randomly, and measurements were performed on 18 trees from 2 sample plots (3 replicates × 18 trees × 2 plots). For assessing the adaptability of seedlings, the efficiency of photosynthesis was calculated by measuring the fluorescence of needles (between 08:00 AM and 11:00 AM), and the water use efficiency of the seedlings was measured from the water potential of the stems (06:00 AM and 12:00 PM). We evaluated the state of the water potential of the stem of the native forest and understory trees, and the drought tolerance of the afforested seedlings was evaluated. According to the results of the ecophysiological measurements, the fluorescence measurements of the larch in the afforested area (Fv/Fm 0.79) were similar to the fluorescence state of the larch in the native forest trees (Fv/Fm 0.77-0.80). The water potential of the stem did not reveal any differences between the native forest (-1.49±0.18 Mpa), young trees (-1.27±0.25 Mpa), seedlings (-1.64±0.25 Mpa), or sample trees (df=6; p=0.5). However, it differed between sample sites (df=2; p=0.002). This finding indicated that the juvenile trees have higher adaptability to the environment and the survival of the seedlings is relatively high. Afforested seedlings have a low water stress exposure, indicating their high tolerance to drought and adaptability.
Улаанбаатар хотын ногоон бүсийн доройтсон ойд тарьсан Сибирь шинэсний (Larix sibirica LDB). тарьцын экофизиологийн судалгаа
ХУРААНГУЙ: Сибирь шинэс (Larix sibirica Ldb.) Монгол орны ойн сан бүхий газар нутгийн 60 орчим хувийг, Улаанбаатар хотын ногоон бүсийн ойн сангийн 55.6% (85,167 га)-ийг эзлэдэг. Ногоон бүсийн шинэсэн ой нь хотын хүрээлэх орчин, хүн амын эрүүл, аюулгүй орчинд амьдрахад шууд нөлөөлөх ач холбогдолтой юм. Бидний судалгааны ажлын зорилго нь эрчимтэй түймрийн нөлөөгөөр доройтсон ба хавтгайруулан огтолсны дараа доройтсон талбайд ойжуулалт хийсэн таримал өсвөр моддын (тарьц) экофизиологийн төлөв байдлыг тодорхойлоход оршино. Ойжуулалтыг 2023 оны хавар хийсэн бөгөөд тарьцын экофизиологийн хэмжилтүүдийг 7-р сард гүйцэтгэв. Тарьцын дасан зохицох чадварыг үнэлэхдээ шилмүүсний флюоресценцийн хэмжилтээр (өглөө 08:00-11:00 цагийн хооронд) фотосинтезийн үр ашгийг тооцох, мөн ишний усны потенциалын хэмжилтээр (үүр цайхаас өмнөх 06:00 цаг; үд дундын 12:00 цаг) тарьцын ус ашиглах үр ашгийг тодорхойлов (дээжийн давталт 3 × 18 мод × 2 талбай). Экофизиологийн хэмжилтүүдийн үр дүнгээс харахад түймрийн нөлөөгөөр доройтож, ойгүй болсон талбайд ойжуулалт хийсэн тарьцны шилмүүсний флюоресценцийн хэмжилтүүд (Fv/Fm 0.79) эх ойн моддын шилмүүсний флюоресценцийн (Fv/Fm 0.77-0.80) төлөв байдалтай ойролцоо утга илтгэж байгаагаар нь тухай орчинд тарьцын дасан зохицох чадвар сайн, тарьцын амьдрах чадвар өндөр байгааг илтгэж байна. Мөн ишний усны потенциалын хэмжилтээр харахад Эх ой (-1.49±0.18 MPa), өсвөр модод (-1.27±0.25 MPa), тарьц (-1.64±0.25 MPa) буюу дээж моддын хувьд ялгаагүй (df=6; p=0.5), харин дээж талбайн хооронд ялгаатай байлаа (df=2; p=0.002). Үүнээс харахад ойжуулалт хийсэн тарьцны усны стресст өртөх байдал харьцангуй бага буюу хуурайшилтад тэсвэрлэх чадвар өндөр, дасан зохицох чадвар сайтай байгааг илтгэж байна.
Түлхүүр үгс: Ногоон бүсийн ой, ойжуулалт, тарьц, флюоресценци, ишний усны потенциал, Улаанбаатар
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