Effects of wheat straw application on methane and nitrous oxide emissions from purplish paddy fields.
Effects of wheat straw application on methane and nitrous oxide emissions from purplish paddy fields.
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DOI：
10.17221/144/2009-pse
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发表时间：
2018-02
影响因子：
2.4
通讯作者：
Yuying Wang;Chunsheng Hu;B. Zhu;H. Xiang;Xinhua He
中科院分区：
文献类型：
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作者：
Yuying Wang;Chunsheng Hu;B. Zhu;H. Xiang;Xinhua He
在中国西南部，为1亿多人生产水稻的独特紫色农田的温室气体排放信息很少。采用静态箱法研究了紫色水稻土（Regosols，FAO）在4种小麦秸秆施用量（0，S 0; 5.310，S1; 10.620，S2和21.240 kg/hm 2，S3）下的甲烷（CH 4）和氧化亚氮（N2 O）排放。2005年6月1日至9月14日，S 0、S1、S2和S3的CH 4（T（CH 4））或N2 O的季节累积排放量分别为255、417、571和687 kg/ha或3.22、2.66、2.35和2.16 kg/ha。CH 4的季节累积排放量与秸秆施用量（X（秸秆））呈显著正相关（T（CH 4）= 290.72 + 0.02X（秸秆），r（2）= 0.93，P < 0.05）。CH 4通量与5cm土壤温度（T（soil））呈显著正相关（P < 0.05，18.0 ℃ <= T（soil）<= 26.4 ℃）。秸秆施用量低于5.300 kg/hm 2时，紫色水稻土的植物固碳量增加，但CH 4、N2 O排放量和碳当量排放量与固碳量的比值没有增加。
Little information has been known on greenhouse gas emissions from the unique purplish farmland that produces rice for more than 100 million people in Southwest China. We studied methane (CH(4)) and nitrous oxide (N(2)O) emissions under four wheat straw application rates (0, S0; 5.310, S1; 10.620, S2 and 21.240 kg/ha, S3) to a purplish paddy field (Regosols in FAO taxonomy) with the static chamber technique. The seasonal accumulative CH(4) (T(CH4)) or N(2)O emissions from S0, S1, S2 and S3 were 255, 417, 571 and 687 kg/ha or 3.22, 2,66, 2.35 and 2.16 kg/ha during period from June I to September 14, 2005, respectively. Seasonal accumulative CH(4) emission was significantly correlated with straw application (X(straw)) (T(CH4) = 290.72 + 0.02 X(straw), r(2) = 0.93, P < 0.05). Significantly positive linear correlation was displayed between CH 4 flux rate and soil temperature at 5 cm depth (T(soil)) (P < 0.05, 18.0 degrees C <= T(soil) <= 26.4 degrees C). Straw application less than 5.300 kg/ha could enhance plant carbon fixation amounts, whilst both CH(4), N(2)O emissions and the ratio of carbon equivalent emission to carbon fixation were not increased in the purplish paddy soil.