遮蔭處理對玉米田微氣象及玉米產量之影響

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Title:	遮蔭處理對玉米田微氣象及玉米產量之影響
Authors:	楊之遠
Contributors:	土資系
Keywords:	玉米玉米田產量微氣象遮蔭
Date:	1987-06
Issue Date:	2016-12-27 15:00:54 (UTC+8)
Abstract:	本研究為瞭解氣象因子與玉米之關係，乃以臺農351號玉米為試驗材料，藉人為遮蔭方式來改變農田微氣象環境，調查不同之氣象環境對玉米植株生育及產量的影響。本研究採用35%及65%二種不同遮蔭密度之PE遮蔭網，並以三種不同之遮蔭期(前期、中期、全期)做遮蔭處理。經以微氣象自動觀測系統測訂，發現遮蔭處理會減少遮蔭區之日射量，但是並未減低65%遮蔭區之氣溫，而遮蔭處理會減低地溫，因此使遮蔭區之土壤通量減少，土壤濕度增加，其增減程度視遮蔭程度而增加。由於前述遮蔭所導致之微氣象環境之改變，使得遮蔭處理區玉米植株之株高、稈重、根重較對照處理為少，同時遮蔭程度愈多，以及遮蔭期愈長，其影響程度亦愈大，同時遮蔭處理植株容易倒伏。一般而言，玉米平均果穗乾重、平均果穗鮮重、平均穗長、平均穗徑隨遮蔭程度及遮蔭期之延長而減少，惟平均穗徑在35%遮蔭密度下，中期遮蔭略大於前期遮蔭。根據本試驗結果顯示，遮蔭不但減低日射量，亦使地溫降低，不僅影響植株地上部之生育，亦能導致地下部發育不良，然而35%遮蔭密度初期遮蔭處理對果穗乾重及根長之影響不大。 In order to understand the influence of weather on the growth of corn, cultivar Tainung 351 was planted during 1984 and 1985. The black polyethylene net of 35% and 65% porosity were used in cornfield for shading treatment. A micrometeology observation system was used to measure the alteration of micrometeorology in shading area. The shading treatment did not decrease the air temperature of shading area, but decreased the soil temperature and soil heat flux, and increased the soil moisture of shading area. The plant height, stock weight, root weight and ear product of corn in shading area were decreased as the result of the change of micrometeorology induced by shading treatment. Meanwhile, plants in shading area were easy to lodge. The results indicated that the shading treatment not only reduced solar radiation and soil temperature but let to weak development of stems and roots.
Relation:	中華農學會報 138 民76.06 頁16-30
Appears in Collections:	[Department of Natural Resources ] journal articles

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