广州地区早稻品种与施肥对稻田甲烷排放通量的影响研究

STUDY ON THE RELATION BETWEEN METHANE EMISSION AND APPLYING DIFFERENT KINDS OF FERTILIZER AND CULTIVARS IN EARLY RICE PADDY-FIELD IN GUANGZHOU AREA

研究了广州地区早稻２个稻种（Ａ粳籼８９；Ｂ汕优６３）在２种施肥处理（１有机肥＋化肥；２化肥）下，各个试区的甲烷排放通量与排放规律研究表明：“粳籼８９”在处理１和处理２的ＣＨ４排放通量分别为８１和１２ｍｇ／（ｍ２·ｈ）；“汕优６３”在处理１和处理２的ＣＨ４排放通量分别为４６和２５ｍｇ／（ｍ２·ｈ）２个稻种在同种施肥及常规间歇灌溉管理条件下，ＣＨ４排放通量有一定差异在施肥处理１，“粳籼８９”与“汕优６３”ＣＨ４排放通量之比为１７６∶１；在施肥处理２，两者之比为１∶２１；处理１的２个稻种在水稻生长前期、中期和后期都有１个ＣＨ４排放高峰；

Methane (CH 4) emission flux and emission pattern in early rice paddy-field in Guangzhou region were studied. Two rice varieties (“JX 89 ”and “SY 63”) were cultivated and two fertilizer, treatments were given: Treatment 1-manure plus chemical fertilizer, Treatment 2-chemical fertilizer only. The results indicated that CH 4 emission flux in “JX 89” field was 8.1 mg/(m 2·h) in treatment 1 and 1.2 mg/(m 2·h) in treatment 2 respectively.CH 4 emission flux in “SY 63” field was 4.6 mg/(m 2·h) in tratment 1 and 2.5 mg/(m 2·h) in treatment 2 respectively. Under the same fertilizer application and rotational irrigation condition, two rice varieties showed different CH 4 emission flux.CH 4 emission flux in “JX89” field and “SY63” field was in the ratio of 1.76 to 1 in treament 1 and 1 to 2.1 in treament 2. Two rice varieties had a CH 4 emission peak in early, middle and later stages of rice growth in treatment 1 respectively. While in treatment 2, two rice varieties showed a CH 4 emisssion peak in early and later stages.