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秸秆集中深埋对水稻生长及水稻土氮素淋失的影响

时间:2014-02-25 14:54来源:未知 作者:admin 点击:
秸秆集中深埋对水稻生长及水稻土氮素淋失的影响
扶明英1,朱利群1,2,李妍1,卞新民1,2*
(1南京农业大学农学院,南京210095;2南京农业大学资源与环境科学学院,南京210095)
    摘要:研究麦秸集中深埋的深度和埋草量对稻田氮素淋失及对水稻生长和产量的影响,为完善秸秆集中深埋技术体系、确定技术关键提供理论依据。用麦秸采用盆栽进行模拟试验,设置5 kg/m2埋草量条件下不同埋深处理:H1为20 cm、H2为35 cm、H3为50 cm,设置35 cm埋深条件下不同埋草量处理:L1为5 kg/m2、L2为10 kg/m2、L3为15 kg/m2,以及CK:无秸秆等7个处理,深度20、35 cm处理均可显著提高水稻的株高,35cm的株高比CK增加了9.27%;增加叶片中叶绿素的相对含量;并促进水稻的分蘖,35 cm的分蘖比CK增加了1.13个/穴,并且35 cm的水稻产量比CK增加了12.5%。秸秆还田后,稻田水的渗漏量增加了,埋草量越多,渗漏量越大,但相同埋草量下不同埋深处理间的渗漏量无差异;20和35cm可以显著降低稻田渗漏水的日平均含氮量,分别降低了19.58%和17.20%;整个水稻生育期内,20和35 cm处理下的氮素截留率为最高,分别为7.35%和10.90%。35 cm处理既有利于水稻的生长和可以提高水稻的产量,又对稻田氮素养分的淋失有拦截作用,为最佳处理。
    关键词:秸秆;沟埋还田;氮素淋失;水稻
Effects of straw deep-buried return on the impact on rice growth and nitrogen leaching in paddy fields
FU Ming-ying, ZHU Li-qun, LI Yan, BIAN Xin-min*
(College of Agronomy1,Nanjing Agricultural University ,Nanjing, 210095, China)
Abstract: 【Objective】Study the effects of wheat-straw deep-buried’s depth and amount on rice growth and yield and nitrogen leaching in paddy fields, provide a theoretical basis to improve the technical system and identify key technology of straw concentrate deep-buried return. 【Method】Seven treatments, different buried depth with the 5 kg/m2 buried amount :H1: 20 cm depth, H2 (L1): 35 cm depth, H3: 50 cm depth; setting different buried amount with the 35cm buried depth:L1: 5kg/m2 amount, L2: 10kg/m2 amount, L3: 15kg/m2 amount  and CK: no straw return,were conducted under barreled experiments. 【Result】20 and 35 cm buried depth can significantly improve the rice plant height ,35cm buried depth’s height increased by 9.27% compared with CK; increase the relative content of chlorophyll;and promote rice tillering,35 cm buried depth’s tillers increased 1.13/hole compared with CK, 35 cm buried depth’s yield increased by 9.27% compared with CK. After wheat-straw ditch-buried returning, the percolate rate of L2 and L3 treatments were significantly higher than CK treatments, the more wheat-straw buried, the greater leakage.but treatments at different buried depth with the same buried amount were no difference. 20 and 35 cm can significantly reduce the leakage of rice daily average nitrogen content of the water, were reduced by 19.58% and 17.20%.【Conclusion】H2 is the best treatment, which could not only benefit for rice growth and yield, but also intercept nitrogen leaching from paddy fields.
Key words: straw; straw deep-buried return; nitrogen leaching; rice
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