การศึกษาปัจจัยทางธรรมชาติต่อการงอกและการเจริญเติบโตของก่อข้าว (Castanopsis indica)

The effect of environmental factors on seed germination, and seedling growth and survival of Castanopsis indica

Name: ศันสนีย์ ศรีอมรมงคล

Name: Sansanee Sriamonmongkol

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: ข้าว

; Rice

Abstract: The branches of Castanopsis indica trees are a highly suitable substrate formushroom cultivation. This has encouraged local villagers in northern andnortheastern Thailand to cut C. indica and other similar species trees extensively,which may threaten these populations. Understanding effects of environmentalfactors on C. indica seed germination and seedling establishment are important forthe management of this and other similar species. Three experiments were conductedto examine seed germination in the field and seedling growth in the nursery. First,the effects of canopy and ground vegetation cover on seed germination wasconducted in two community forests and one national park, in Amphur Nahaeo, Loeiprovince. In each study area, 1x1 m2 plots were selected on the basis of differentlevels of canopy and ground vegetation cover. Second, the effects of predation onseed germination and seed mortality were examined, using the same methods as inthe previous experiment, but half of the plots were covered with plastic nets or metalcages to protect the seeds from predators. Third (the third experiment examined) theeffects of light intensity and water availability on seedling growth in the nurserywere examined. Planted seedlings in one of three light treatments (full sunlight,partial shade and heavy shade) and two watering treatments (low moisture and highmoisture).The results suggested that the effects of vegetation cover and canopy coveron seed germination were small. The main factor affecting seed germination wasseed predation, which caused seed losses of up to 92.5%. The results also suggestedthat the metal cages were probably more effective in protecting seeds from predatorsthan the plastic netting. The percentage of seed predation increased with increasedvegetation cover and seed predation seemed to be slower in the less disturbed forest(the National Park) during the early germination period (October-January).In the nursery all C. indica seedlings given full sunlight and only naturalrainfall water died after 45 days, whereas partial shade (30% of full sunlight) andheavy shade (13% of full sunlight) increased survival to 60% and 33% respectively.Radial, vertical and leaf growth was significantly less in the forest (5% of fullsunlight) when compared to the treatments in the nursery, but seedlings in the foresthad 100% survival. Radial growth was also significantly greater in the partial shadetreatment than under heavy shade.In conclusion, in the field, predation appeared to be the main factor affectingseed germination, while in the nursery light intensity seemed to be the mostimportant factor regulating seedling growth, and water availability seemed mostimportant to seedling survival.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี. สำนักหอสมุด

Address: กรุงเทพมหานคร

Email: info.lib@mail.kmutt.ac.th

Name: Sudarut Tripetchkul

Role: Advisor

Name: George A.Gale

Role: Advisor

Created: 2543

Issued: 2007-02-12

Modified: 2559-02-01

วิทยานิพนธ์/Thesis

ISBN: 9746283715

CallNumber: NRM39

tha

DegreeName: วิทยาศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: การจัดการทรัพยากรชีวภาพ

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	NRM39.pdf	2.72 MB	153	2020-06-26 14:00:41
2	NRM39ab.pdf	163.31 KB	76	2018-05-10 17:34:04
3	NRM39ab.txt	3.12 KB	46	2018-05-10 17:34:06

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