秸秆还田方式对种床土壤物理性质和小麦生长的影响
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现代农业产业技术体系建设专项资金项目(CARS-03)、教育部创新团队发展计划项目(IRT13039)和公益性行业(农业)科研专项资金项目(201503136)


Effect of Straw Returning Manners on Seedbed Soil Physical Properties and Winter Wheat Growth
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    摘要:

    华北平原一年两熟区粮食产量高、秸秆量大,玉米收获后播种小麦时需要对秸秆进行适宜的处理。为解决此问题,本文于2016—2018年在河北涿州试验站开展田间定位试验,研究了不同玉米秸秆还田与种床位置关系对种床土壤含水率、地温、水稳性团聚体含量、冬小麦出苗率及产量的影响。试验共设置4个处理:秸秆混埋(SM)、少量秸秆混埋(HSM)、秸秆覆盖(SC)和秸秆不还田(CK)。试验结果表明,相较于秸秆不还田对照组CK,秸秆还田可以提高0~30cm种床土壤含水率,效果由大到小依次为:SC、HSM、SM;显著增加水稳性大团聚体(>0.25mm)含量,SM、HSM、SC分别提高6.3、4.9、4.8个百分点;对地温变化呈现出“缓解效应”,其效果从大到小依次为SC、SM、HSM,导致越冬期土壤回暖变慢;增加冬小麦出苗率,HSM、SC、SM平均增加40.1%、34.1%、14.8%,且HSM在第1年显著高于SM;提高产量,SC、HSM、SM平均增产17.2%、10.9%、2.9%,且第1年SM产量显著低于SC。本研究结果表明,秸秆还田对地温有负面影响,但可以增加土壤水分,改善土壤结构,因此最终提高了小麦产量;3种秸秆还田处理中,由于秸秆混埋(SM)使土壤含水率、出苗率、产量均最低,且对地温影响较大,因此优先推荐秸秆覆盖(SC)和少量秸秆混埋(HSM)。

    Abstract:

    In the double cropping area of North China Plain, the straw amount is huge as a result of the tremendous grain production, therefore, the maize straw needs proper handling during wheat seeding for the good of soil health and wheat grown. In order to address this issue, a field experiment was conducted in the experimental station at Zhuozhou, Hebei Province in 2016—2018, the effects of straw returning position on the seedbed physical properties of soil moisture content, soil temperature, soil aggregate size distribution, percentage emergence and yield of winter wheat were studied. Four treatments were investigated, including straw mixture (SM), half straw mixture (HSM), straw cover (SC) and controlled check of no straw returning (CK). Experiment results showed that straw return could: increase seedbed soil moisture content at 0~30cm, SC and HSM had significant increasing effect while SM had not, which was even lower than CK at 0~10cm depth in 2016;increase seedbed soil water stable macroaggregates, SM, HSM, SC all showed significant effect and macroaggregates were increased by 6.3, 4.9 and 4.8 percentage points, respectively;mitigate soil temperature change, soil temperature of CK at noon was significantly higher than the straw returning treatments, indicating that straw return could lead to slower warm up of soil which was not good for wheat growth;increase percentage emergence of winter wheat, the order from high to low was HSM, SC, SM and CK, and percentage emergence was increased by 40.1%, 34.1%, 14.8%, respectively, however, only HSM showed significant effect, besides SM was significantly lower than HSM in 2016;increase winter wheat yield by 17.2%, 10.9% and 2.9% of SC, HSM and SM, respectively. It could be concluded that straw returning, although impacted soil temperature, it could increase soil water content, improve soil structure and soil health, thus ultimately increasing winter wheat yield. Among the three straw returning treatments, SC obtained the highest yield, then HSM of half straw mixture. SM of straw mixture obtained the highest water stable macroaggregates, but nonetheless the soil moisture and percentage emergence of it was the least, besides it had a certain impact on soil temperature, thus leading to the lowest yield of the three treatments, therefore straw returning positions of SC and HCM were more recommended.

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赵宏波,何进,李洪文,王庆杰,李问盈,刘文政.秸秆还田方式对种床土壤物理性质和小麦生长的影响[J].农业机械学报,2018,49(s1):60-67.

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  • 收稿日期:2018-07-10
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  • 在线发布日期: 2018-11-10
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