Kumar J I Nirmal, Viyol Shailendra
P.G. Department of Environmental Science and Technology, Institute of Science Technology for Advanced Studies and Research, Vallabh Vidyanagar, India.
J Environ Biol. 2009 Mar;30(2):241-6.
Methane emission from two rice fields of Lambhvel village, Anand district, central Gujarat, India, was measured for whole cultivation period during pre-summer season. Along with the methane emission, soil chemistry of the two rice fields (Organic carbon, PO4(-2) and SO4(-2)) was determined. The methane emission ranged from 105.67 to 720.64 mg m(-2) hr1, having maximum emission during noon period (11 am to 1 pm) of the day at the rice field 1. Besides, at rice field 2, the methane emission ranged between 201.59 to 430.94 mg m(-2) hr1, having maximum peak during same period (11 am to 1 pm) of the day. The results of the current investigation confirm that the methane emission vary substantially between two rice fields, and suggest that soil chemistry and flood water depth might control the methane emission in both the rice fields and suppressed by the phosphate and sulphate concentrations. The greater methane emission was gradually declined from first trip to fourth trip. Correlation analysis, ANOVA and F-test showed that the methane emission from both the sites has positive correlation with organic carbon and negative correlation with sulfate and phosphate content of the soil and the details of these reasons are discussed in this paper.
在印度古吉拉特邦中部阿南德区兰布韦尔村的两块稻田，于夏前季的整个种植期测量了甲烷排放。除甲烷排放外，还测定了这两块稻田的土壤化学性质（有机碳、PO4(-2) 和 SO4(-2)）。稻田 1 的甲烷排放范围为 105.67 至 720.64 毫克/平方米·小时，在当天中午时段（上午 11 点至下午 1 点）排放最高。此外，稻田 2 的甲烷排放范围在 201.59 至 430.94 毫克/平方米·小时之间，在同一天的同一时段（上午 11 点至下午 1 点）达到排放峰值。当前调查结果证实，两块稻田的甲烷排放差异很大，并表明土壤化学性质和淹水深度可能控制着两块稻田的甲烷排放，且受到磷酸盐和硫酸盐浓度的抑制。从第一次测量到第四次测量，较高的甲烷排放量逐渐下降。相关性分析、方差分析和 F 检验表明，两个地点的甲烷排放与有机碳呈正相关，与土壤中的硫酸盐和磷酸盐含量呈负相关，本文讨论了这些原因的详细情况。
