| 徐国伟，翟志华，杨久军，王贺正，陈明灿.秸秆还田量对直播稻苗期生长和土壤的影响[J].广东农业科学,2015,42(19):1-7 |
|
查看全文
HTML
秸秆还田量对直播稻苗期生长和土壤的影响 |
| Effects of different amount of wheat-residue application ongrowth of direct-seeding rice and characteristics of soil |
| |
| DOI： |
| 中文关键词: 水稻 直播 秸秆还田 出苗 根系 |
| 英文关键词: rice direct seedling wheat-residue returning seed emergence root |
| 基金项目:河南省教育厅科学技术研究重点项目
（13A210266）；江苏省作物栽培生理重点实验室开放基
金（027388003K11009） |
|
| 摘要点击次数: 1261 |
| 全文下载次数: 440 |
| 中文摘要: |
| 以徐稻3 号为材料，进行盆栽试验，设置3 t/hm2（S1）、4.5 t/hm2（S2）、6 t/hm2（S3）和7.5
t/hm2（S4）4 种秸秆还田量，以秸秆不还田（S0）为对照，测定不同秸秆还田量下直播稻的出苗率、干物重、
根长、根系活性、秸秆腐解动态、土壤pH 及有机酸含量等指标，探讨不同秸秆还田量对直播水稻出苗与苗期
生长的影响以及土壤特性差异。结果表明：秸秆还田显著降低直播水稻的出苗率，出苗率降低13.1~31.6 个百
分点，少量秸秆还田处理（S1）对直播水稻的根系形态、根系活性及植株干重无显著影响，随着秸秆还田量
的增加，直播稻苗期生长发育速度及根系活性均降低，但出苗20 d 后，S3 与S4 处理植株形态及根系活性无显
著差异；秸秆还田降低了土壤pH 值及秸秆的腐解率，增加了土壤中秸秆腐解量与土壤中有机酸含量，但在S3
与S4 处理下无显著差异；相关分析表明，直播水稻出苗率与土壤有机酸含量呈极显著负相关。 |
| 英文摘要: |
| More than half of wheat-residue are burnt or discarded for years in China，which not only wastes
organic fertilizer source，but also pollutes the environment. To investigate the effects of different amount of wheatresidue
application on emergence in direct-seeding rice and physiological bases，a mid-season japonica rice cultivar
of Xudao 3 was directly sown in the pot，four treatments of wheat-residue application，3 t/hm2（S1），4.5 t/hm2
（S2），6 t/hm2（S3）and 7.5 t/hm2（S4）were set，the indicators like seedling emergence，dry matter weight，
and root length，root activity，decomposing and dynamic of straw，soil pH and organic acid content were determined.
The results showed that the wheat-residue application（the residue was incorporated into soil） reduced seedling
emergence by 13.1%-31.7% compared with the wheat-residue removal treatment. There was no significant difference in
morphological and physiological activity in direct-seeding rice between small amount of wheat-residue returning（S1）
with the wheat-residue removal treatment. With the increase of wheat-residue amount，morphological and physiological
activity of direct-seeding rice decreased，while no obvious difference was found between S3 and S4 treatment after 20
days of seedling. Wheat-residue application reduced the soil pH and straw decomposing rate，increased the amount
of decomposing quantity and organic acid content in the soil，but there was no significant difference under S3 and S4
treatment. Seedling emergence in direct-seeding rice was significantly correlated with the soil organic acid content，
the correlation coefficient reached 0.8951. Reasons for the characteristics of soil in direct-seeding rice，growth and
development under different amount of residue returning were discussed，to provide theoretical basis for clean and light
simplified cultivation in rice. |
|
查看/发表评论 下载PDF阅读器 |
